2367 lines
83 KiB
C
2367 lines
83 KiB
C
//*****************************************************************************
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//
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// sysctl.c - Driver for the system controller.
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//
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// Copyright (c) 2005-2011 Texas Instruments Incorporated. All rights reserved.
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// Software License Agreement
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//
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// Texas Instruments (TI) is supplying this software for use solely and
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// exclusively on TI's microcontroller products. The software is owned by
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// TI and/or its suppliers, and is protected under applicable copyright
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// laws. You may not combine this software with "viral" open-source
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// software in order to form a larger program.
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//
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// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
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// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
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// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
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// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
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// DAMAGES, FOR ANY REASON WHATSOEVER.
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//
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// This is part of revision 6852 of the Stellaris Peripheral Driver Library.
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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//! \addtogroup sysctl_api
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//! @{
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//
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//*****************************************************************************
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#include "inc/hw_ints.h"
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#include "inc/hw_nvic.h"
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#include "inc/hw_sysctl.h"
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#include "inc/hw_types.h"
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#include "driverlib/cpu.h"
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#include "driverlib/debug.h"
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#include "driverlib/interrupt.h"
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#include "driverlib/sysctl.h"
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//*****************************************************************************
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//
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// This macro extracts the array index out of the peripheral number.
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//
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//*****************************************************************************
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#define SYSCTL_PERIPH_INDEX(a) (((a) >> 28) & 0xf)
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//*****************************************************************************
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//
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// This macro constructs the peripheral bit mask from the peripheral number.
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//
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//*****************************************************************************
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#define SYSCTL_PERIPH_MASK(a) (((a) & 0xffff) << (((a) & 0x001f0000) >> 16))
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//*****************************************************************************
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//
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// An array that maps the "peripheral set" number (which is stored in the upper
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// nibble of the SYSCTL_PERIPH_* defines) to the SYSCTL DC? register that
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// contains the peripheral present bit for that peripheral.
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//
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//*****************************************************************************
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static const unsigned long g_pulDCRegs[] =
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{
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SYSCTL_DC1,
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SYSCTL_DC2,
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SYSCTL_DC4,
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SYSCTL_DC1
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};
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//*****************************************************************************
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//
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// An array that maps the "peripheral set" number (which is stored in the upper
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// nibble of the SYSCTL_PERIPH_* defines) to the SYSCTL_SRCR? register that
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// controls the software reset for that peripheral.
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//
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//*****************************************************************************
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static const unsigned long g_pulSRCRRegs[] =
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{
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SYSCTL_SRCR0,
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SYSCTL_SRCR1,
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SYSCTL_SRCR2
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};
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//*****************************************************************************
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//
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// An array that maps the "peripheral set" number (which is stored in the upper
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// nibble of the SYSCTL_PERIPH_* defines) to the SYSCTL_RCGC? register that
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// controls the run-mode enable for that peripheral.
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//
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//*****************************************************************************
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static const unsigned long g_pulRCGCRegs[] =
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{
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SYSCTL_RCGC0,
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SYSCTL_RCGC1,
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SYSCTL_RCGC2
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};
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//*****************************************************************************
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//
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// An array that maps the "peripheral set" number (which is stored in the upper
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// nibble of the SYSCTL_PERIPH_* defines) to the SYSCTL_SCGC? register that
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// controls the sleep-mode enable for that peripheral.
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//
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//*****************************************************************************
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static const unsigned long g_pulSCGCRegs[] =
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{
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SYSCTL_SCGC0,
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SYSCTL_SCGC1,
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SYSCTL_SCGC2
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};
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//*****************************************************************************
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//
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// An array that maps the "peripheral set" number (which is stored in the upper
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// nibble of the SYSCTL_PERIPH_* defines) to the SYSCTL_DCGC? register that
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// controls the deep-sleep-mode enable for that peripheral.
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//
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//*****************************************************************************
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static const unsigned long g_pulDCGCRegs[] =
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{
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SYSCTL_DCGC0,
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SYSCTL_DCGC1,
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SYSCTL_DCGC2
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};
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//*****************************************************************************
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//
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// An array that maps the crystal number in RCC to a frequency.
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//
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//*****************************************************************************
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static const unsigned long g_pulXtals[] =
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{
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1000000,
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1843200,
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2000000,
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2457600,
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3579545,
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3686400,
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4000000,
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4096000,
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4915200,
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5000000,
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5120000,
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6000000,
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6144000,
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7372800,
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8000000,
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8192000,
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10000000,
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12000000,
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12288000,
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13560000,
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14318180,
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16000000,
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16384000
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};
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//*****************************************************************************
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//
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//! \internal
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//! Checks a peripheral identifier.
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//!
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//! \param ulPeripheral is the peripheral identifier.
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//!
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//! This function determines if a peripheral identifier is valid.
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//!
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//! \return Returns \b true if the peripheral identifier is valid and \b false
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//! otherwise.
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//
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//*****************************************************************************
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#ifdef DEBUG
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static tBoolean
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SysCtlPeripheralValid(unsigned long ulPeripheral)
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{
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return((ulPeripheral == SYSCTL_PERIPH_ADC0) ||
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(ulPeripheral == SYSCTL_PERIPH_ADC1) ||
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(ulPeripheral == SYSCTL_PERIPH_CAN0) ||
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(ulPeripheral == SYSCTL_PERIPH_CAN1) ||
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(ulPeripheral == SYSCTL_PERIPH_CAN2) ||
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(ulPeripheral == SYSCTL_PERIPH_COMP0) ||
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(ulPeripheral == SYSCTL_PERIPH_COMP1) ||
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(ulPeripheral == SYSCTL_PERIPH_COMP2) ||
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(ulPeripheral == SYSCTL_PERIPH_EPI0) ||
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(ulPeripheral == SYSCTL_PERIPH_ETH) ||
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(ulPeripheral == SYSCTL_PERIPH_GPIOA) ||
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(ulPeripheral == SYSCTL_PERIPH_GPIOB) ||
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(ulPeripheral == SYSCTL_PERIPH_GPIOC) ||
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(ulPeripheral == SYSCTL_PERIPH_GPIOD) ||
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(ulPeripheral == SYSCTL_PERIPH_GPIOE) ||
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(ulPeripheral == SYSCTL_PERIPH_GPIOF) ||
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(ulPeripheral == SYSCTL_PERIPH_GPIOG) ||
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(ulPeripheral == SYSCTL_PERIPH_GPIOH) ||
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(ulPeripheral == SYSCTL_PERIPH_GPIOJ) ||
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(ulPeripheral == SYSCTL_PERIPH_HIBERNATE) ||
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(ulPeripheral == SYSCTL_PERIPH_I2C0) ||
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(ulPeripheral == SYSCTL_PERIPH_I2C1) ||
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(ulPeripheral == SYSCTL_PERIPH_I2S0) ||
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(ulPeripheral == SYSCTL_PERIPH_IEEE1588) ||
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(ulPeripheral == SYSCTL_PERIPH_MPU) ||
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(ulPeripheral == SYSCTL_PERIPH_PLL) ||
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(ulPeripheral == SYSCTL_PERIPH_PWM) ||
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(ulPeripheral == SYSCTL_PERIPH_QEI0) ||
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(ulPeripheral == SYSCTL_PERIPH_QEI1) ||
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(ulPeripheral == SYSCTL_PERIPH_SSI0) ||
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(ulPeripheral == SYSCTL_PERIPH_SSI1) ||
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(ulPeripheral == SYSCTL_PERIPH_TEMP) ||
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(ulPeripheral == SYSCTL_PERIPH_TIMER0) ||
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(ulPeripheral == SYSCTL_PERIPH_TIMER1) ||
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(ulPeripheral == SYSCTL_PERIPH_TIMER2) ||
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(ulPeripheral == SYSCTL_PERIPH_TIMER3) ||
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(ulPeripheral == SYSCTL_PERIPH_UART0) ||
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(ulPeripheral == SYSCTL_PERIPH_UART1) ||
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(ulPeripheral == SYSCTL_PERIPH_UART2) ||
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(ulPeripheral == SYSCTL_PERIPH_UDMA) ||
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(ulPeripheral == SYSCTL_PERIPH_USB0) ||
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(ulPeripheral == SYSCTL_PERIPH_WDOG0) ||
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(ulPeripheral == SYSCTL_PERIPH_WDOG1));
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}
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#endif
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//*****************************************************************************
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//
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//! Gets the size of the SRAM.
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//!
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//! This function determines the size of the SRAM on the Stellaris device.
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//!
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//! \return The total number of bytes of SRAM.
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//
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//*****************************************************************************
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unsigned long
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SysCtlSRAMSizeGet(void)
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{
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//
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// Compute the size of the SRAM.
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//
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return(((HWREG(SYSCTL_DC0) & SYSCTL_DC0_SRAMSZ_M) >> 8) + 0x100);
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}
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//*****************************************************************************
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//
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//! Gets the size of the flash.
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//!
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//! This function determines the size of the flash on the Stellaris device.
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//!
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//! \return The total number of bytes of flash.
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//
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//*****************************************************************************
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unsigned long
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SysCtlFlashSizeGet(void)
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{
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//
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// Compute the size of the flash.
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//
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return(((HWREG(SYSCTL_DC0) & SYSCTL_DC0_FLASHSZ_M) << 11) + 0x800);
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}
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//*****************************************************************************
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//
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//! Determines if a pin is present.
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//!
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//! \param ulPin is the pin in question.
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//!
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//! Determines if a particular pin is present in the device. The PWM, analog
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//! comparators, ADC, and timers have a varying number of pins across members
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//! of the Stellaris family; this will determine which are present on this
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//! device.
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//!
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//! The \e ulPin argument must be only one of the following values:
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//! \b SYSCTL_PIN_PWM0, \b SYSCTL_PIN_PWM1, \b SYSCTL_PIN_PWM2,
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//! \b SYSCTL_PIN_PWM3, \b SYSCTL_PIN_PWM4, \b SYSCTL_PIN_PWM5,
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//! \b SYSCTL_PIN_C0MINUS, \b SYSCTL_PIN_C0PLUS, \b SYSCTL_PIN_C0O,
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//! \b SYSCTL_PIN_C1MINUS, \b SYSCTL_PIN_C1PLUS, \b SYSCTL_PIN_C1O,
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//! \b SYSCTL_PIN_C2MINUS, \b SYSCTL_PIN_C2PLUS, \b SYSCTL_PIN_C2O,
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//! \b SYSCTL_PIN_ADC0, \b SYSCTL_PIN_ADC1, \b SYSCTL_PIN_ADC2,
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//! \b SYSCTL_PIN_ADC3, \b SYSCTL_PIN_ADC4, \b SYSCTL_PIN_ADC5,
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//! \b SYSCTL_PIN_ADC6, \b SYSCTL_PIN_ADC7, \b SYSCTL_PIN_CCP0,
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//! \b SYSCTL_PIN_CCP1, \b SYSCTL_PIN_CCP2, \b SYSCTL_PIN_CCP3,
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//! \b SYSCTL_PIN_CCP4, \b SYSCTL_PIN_CCP5, \b SYSCTL_PIN_CCP6,
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//! \b SYSCTL_PIN_CCP7, \b SYSCTL_PIN_32KHZ, or \b SYSCTL_PIN_MC_FAULT0.
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//!
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//! \return Returns \b true if the specified pin is present and \b false if it
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//! is not.
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//
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//*****************************************************************************
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tBoolean
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SysCtlPinPresent(unsigned long ulPin)
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{
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//
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// Check the arguments.
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//
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ASSERT((ulPin == SYSCTL_PIN_PWM0) ||
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(ulPin == SYSCTL_PIN_PWM1) ||
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(ulPin == SYSCTL_PIN_PWM2) ||
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(ulPin == SYSCTL_PIN_PWM3) ||
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(ulPin == SYSCTL_PIN_PWM4) ||
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(ulPin == SYSCTL_PIN_PWM5) ||
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(ulPin == SYSCTL_PIN_C0MINUS) ||
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(ulPin == SYSCTL_PIN_C0PLUS) ||
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(ulPin == SYSCTL_PIN_C0O) ||
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(ulPin == SYSCTL_PIN_C1MINUS) ||
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(ulPin == SYSCTL_PIN_C1PLUS) ||
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(ulPin == SYSCTL_PIN_C1O) ||
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(ulPin == SYSCTL_PIN_C2MINUS) ||
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(ulPin == SYSCTL_PIN_C2PLUS) ||
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(ulPin == SYSCTL_PIN_C2O) ||
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(ulPin == SYSCTL_PIN_MC_FAULT0) ||
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(ulPin == SYSCTL_PIN_ADC0) ||
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(ulPin == SYSCTL_PIN_ADC1) ||
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(ulPin == SYSCTL_PIN_ADC2) ||
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(ulPin == SYSCTL_PIN_ADC3) ||
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(ulPin == SYSCTL_PIN_ADC4) ||
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(ulPin == SYSCTL_PIN_ADC5) ||
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(ulPin == SYSCTL_PIN_ADC6) ||
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(ulPin == SYSCTL_PIN_ADC7) ||
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(ulPin == SYSCTL_PIN_CCP0) ||
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(ulPin == SYSCTL_PIN_CCP1) ||
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(ulPin == SYSCTL_PIN_CCP2) ||
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(ulPin == SYSCTL_PIN_CCP3) ||
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(ulPin == SYSCTL_PIN_CCP4) ||
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(ulPin == SYSCTL_PIN_CCP5) ||
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(ulPin == SYSCTL_PIN_32KHZ));
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//
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// Determine if this pin is present.
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//
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if(HWREG(SYSCTL_DC3) & ulPin)
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{
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return(true);
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}
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else
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{
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return(false);
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}
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}
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//*****************************************************************************
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//
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//! Determines if a peripheral is present.
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//!
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//! \param ulPeripheral is the peripheral in question.
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//!
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//! Determines if a particular peripheral is present in the device. Each
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//! member of the Stellaris family has a different peripheral set; this will
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//! determine which are present on this device.
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//!
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//! The \e ulPeripheral parameter must be only one of the following values:
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//! \b SYSCTL_PERIPH_ADC0, \b SYSCTL_PERIPH_ADC1, \b SYSCTL_PERIPH_CAN0,
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//! \b SYSCTL_PERIPH_CAN1, \b SYSCTL_PERIPH_CAN2, \b SYSCTL_PERIPH_COMP0,
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//! \b SYSCTL_PERIPH_COMP1, \b SYSCTL_PERIPH_COMP2, \b SYSCTL_PERIPH_EPI0,
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//! \b SYSCTL_PERIPH_ETH, \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB,
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//! \b SYSCTL_PERIPH_GPIOC, \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE,
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//! \b SYSCTL_PERIPH_GPIOF, \b SYSCTL_PERIPH_GPIOG, \b SYSCTL_PERIPH_GPIOH,
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//! \b SYSCTL_PERIPH_GPIOJ, \b SYSCTL_PERIPH_HIBERNATE, \b SYSCTL_PERIPH_I2C0,
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//! \b SYSCTL_PERIPH_I2C1, \b SYSCTL_PERIPH_I2S0, \b SYSCTL_PERIPH_IEEE1588,
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//! \b SYSCTL_PERIPH_MPU, \b SYSCTL_PERIPH_PLL, \b SYSCTL_PERIPH_PWM,
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//! \b SYSCTL_PERIPH_QEI0, \b SYSCTL_PERIPH_QEI1, \b SYSCTL_PERIPH_SSI0,
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//! \b SYSCTL_PERIPH_SSI1, \b SYSCTL_PERIPH_TIMER0, \b SYSCTL_PERIPH_TIMER1,
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//! \b SYSCTL_PERIPH_TIMER2, \b SYSCTL_PERIPH_TIMER3, \b SYSCTL_PERIPH_TEMP,
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//! \b SYSCTL_PERIPH_UART0, \b SYSCTL_PERIPH_UART1, \b SYSCTL_PERIPH_UART2,
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//! \b SYSCTL_PERIPH_UDMA, \b SYSCTL_PERIPH_USB0, \b SYSCTL_PERIPH_WDOG0, or
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//! \b SYSCTL_PERIPH_WDOG1.
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//!
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//! \return Returns \b true if the specified peripheral is present and \b false
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//! if it is not.
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//
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//*****************************************************************************
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tBoolean
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SysCtlPeripheralPresent(unsigned long ulPeripheral)
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{
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//
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// Check the arguments.
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//
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ASSERT(SysCtlPeripheralValid(ulPeripheral));
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//
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// Read the correct DC register and determine if this peripheral exists.
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//
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if(ulPeripheral == SYSCTL_PERIPH_USB0)
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{
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//
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// USB is a special case since the DC bit is missing for USB0.
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//
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if(HWREG(SYSCTL_DC6) & SYSCTL_DC6_USB0_M)
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{
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return(true);
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}
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else
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{
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return(false);
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}
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}
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else if(HWREG(g_pulDCRegs[SYSCTL_PERIPH_INDEX(ulPeripheral)]) &
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SYSCTL_PERIPH_MASK(ulPeripheral))
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{
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return(true);
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}
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else
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{
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return(false);
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}
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}
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|
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//*****************************************************************************
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//
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//! Performs a software reset of a peripheral.
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//!
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//! \param ulPeripheral is the peripheral to reset.
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//!
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//! This function performs a software reset of the specified peripheral. An
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//! individual peripheral reset signal is asserted for a brief period and then
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//! deasserted, returning the internal state of the peripheral to its reset
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//! condition.
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//!
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//! The \e ulPeripheral parameter must be only one of the following values:
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//! \b SYSCTL_PERIPH_ADC0, \b SYSCTL_PERIPH_ADC1, \b SYSCTL_PERIPH_CAN0,
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//! \b SYSCTL_PERIPH_CAN1, \b SYSCTL_PERIPH_CAN2, \b SYSCTL_PERIPH_COMP0,
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//! \b SYSCTL_PERIPH_COMP1, \b SYSCTL_PERIPH_COMP2, \b SYSCTL_PERIPH_EPI0,
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//! \b SYSCTL_PERIPH_ETH, \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB,
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//! \b SYSCTL_PERIPH_GPIOC, \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE,
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//! \b SYSCTL_PERIPH_GPIOF, \b SYSCTL_PERIPH_GPIOG, \b SYSCTL_PERIPH_GPIOH,
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//! \b SYSCTL_PERIPH_GPIOJ, \b SYSCTL_PERIPH_HIBERNATE, \b SYSCTL_PERIPH_I2C0,
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//! \b SYSCTL_PERIPH_I2C1, \b SYSCTL_PERIPH_I2S0, \b SYSCTL_PERIPH_PWM,
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//! \b SYSCTL_PERIPH_QEI0, \b SYSCTL_PERIPH_QEI1, \b SYSCTL_PERIPH_SSI0,
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//! \b SYSCTL_PERIPH_SSI1, \b SYSCTL_PERIPH_TIMER0, \b SYSCTL_PERIPH_TIMER1,
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//! \b SYSCTL_PERIPH_TIMER2, \b SYSCTL_PERIPH_TIMER3, \b SYSCTL_PERIPH_TEMP,
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//! \b SYSCTL_PERIPH_UART0, \b SYSCTL_PERIPH_UART1, \b SYSCTL_PERIPH_UART2,
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//! \b SYSCTL_PERIPH_UDMA, \b SYSCTL_PERIPH_USB0, \b SYSCTL_PERIPH_WDOG0, or
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//! \b SYSCTL_PERIPH_WDOG1.
|
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//!
|
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//! \return None.
|
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//
|
|
//*****************************************************************************
|
|
void
|
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SysCtlPeripheralReset(unsigned long ulPeripheral)
|
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{
|
|
volatile unsigned long ulDelay;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(SysCtlPeripheralValid(ulPeripheral));
|
|
|
|
//
|
|
// Put the peripheral into the reset state.
|
|
//
|
|
HWREG(g_pulSRCRRegs[SYSCTL_PERIPH_INDEX(ulPeripheral)]) |=
|
|
SYSCTL_PERIPH_MASK(ulPeripheral);
|
|
|
|
//
|
|
// Delay for a little bit.
|
|
//
|
|
for(ulDelay = 0; ulDelay < 16; ulDelay++)
|
|
{
|
|
}
|
|
|
|
//
|
|
// Take the peripheral out of the reset state.
|
|
//
|
|
HWREG(g_pulSRCRRegs[SYSCTL_PERIPH_INDEX(ulPeripheral)]) &=
|
|
~SYSCTL_PERIPH_MASK(ulPeripheral);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables a peripheral.
|
|
//!
|
|
//! \param ulPeripheral is the peripheral to enable.
|
|
//!
|
|
//! Peripherals are enabled with this function. At power-up, all peripherals
|
|
//! are disabled; they must be enabled in order to operate or respond to
|
|
//! register reads/writes.
|
|
//!
|
|
//! The \e ulPeripheral parameter must be only one of the following values:
|
|
//! \b SYSCTL_PERIPH_ADC0, \b SYSCTL_PERIPH_ADC1, \b SYSCTL_PERIPH_CAN0,
|
|
//! \b SYSCTL_PERIPH_CAN1, \b SYSCTL_PERIPH_CAN2, \b SYSCTL_PERIPH_COMP0,
|
|
//! \b SYSCTL_PERIPH_COMP1, \b SYSCTL_PERIPH_COMP2, \b SYSCTL_PERIPH_EPI0,
|
|
//! \b SYSCTL_PERIPH_ETH, \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB,
|
|
//! \b SYSCTL_PERIPH_GPIOC, \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE,
|
|
//! \b SYSCTL_PERIPH_GPIOF, \b SYSCTL_PERIPH_GPIOG, \b SYSCTL_PERIPH_GPIOH,
|
|
//! \b SYSCTL_PERIPH_GPIOJ, \b SYSCTL_PERIPH_HIBERNATE, \b SYSCTL_PERIPH_I2C0,
|
|
//! \b SYSCTL_PERIPH_I2C1, \b SYSCTL_PERIPH_I2S0, \b SYSCTL_PERIPH_PWM,
|
|
//! \b SYSCTL_PERIPH_QEI0, \b SYSCTL_PERIPH_QEI1, \b SYSCTL_PERIPH_SSI0,
|
|
//! \b SYSCTL_PERIPH_SSI1, \b SYSCTL_PERIPH_TIMER0, \b SYSCTL_PERIPH_TIMER1,
|
|
//! \b SYSCTL_PERIPH_TIMER2, \b SYSCTL_PERIPH_TIMER3, \b SYSCTL_PERIPH_TEMP,
|
|
//! \b SYSCTL_PERIPH_UART0, \b SYSCTL_PERIPH_UART1, \b SYSCTL_PERIPH_UART2,
|
|
//! \b SYSCTL_PERIPH_UDMA, \b SYSCTL_PERIPH_USB0, \b SYSCTL_PERIPH_WDOG0, or
|
|
//! \b SYSCTL_PERIPH_WDOG1.
|
|
//!
|
|
//! \note It takes five clock cycles after the write to enable a peripheral
|
|
//! before the the peripheral is actually enabled. During this time, attempts
|
|
//! to access the peripheral will result in a bus fault. Care should be taken
|
|
//! to ensure that the peripheral is not accessed during this brief time
|
|
//! period.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlPeripheralEnable(unsigned long ulPeripheral)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(SysCtlPeripheralValid(ulPeripheral));
|
|
|
|
//
|
|
// Enable this peripheral.
|
|
//
|
|
HWREG(g_pulRCGCRegs[SYSCTL_PERIPH_INDEX(ulPeripheral)]) |=
|
|
SYSCTL_PERIPH_MASK(ulPeripheral);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables a peripheral.
|
|
//!
|
|
//! \param ulPeripheral is the peripheral to disable.
|
|
//!
|
|
//! Peripherals are disabled with this function. Once disabled, they will not
|
|
//! operate or respond to register reads/writes.
|
|
//!
|
|
//! The \e ulPeripheral parameter must be only one of the following values:
|
|
//! \b SYSCTL_PERIPH_ADC0, \b SYSCTL_PERIPH_ADC1, \b SYSCTL_PERIPH_CAN0,
|
|
//! \b SYSCTL_PERIPH_CAN1, \b SYSCTL_PERIPH_CAN2, \b SYSCTL_PERIPH_COMP0,
|
|
//! \b SYSCTL_PERIPH_COMP1, \b SYSCTL_PERIPH_COMP2, \b SYSCTL_PERIPH_EPI0,
|
|
//! \b SYSCTL_PERIPH_ETH, \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB,
|
|
//! \b SYSCTL_PERIPH_GPIOC, \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE,
|
|
//! \b SYSCTL_PERIPH_GPIOF, \b SYSCTL_PERIPH_GPIOG, \b SYSCTL_PERIPH_GPIOH,
|
|
//! \b SYSCTL_PERIPH_GPIOJ, \b SYSCTL_PERIPH_HIBERNATE, \b SYSCTL_PERIPH_I2C0,
|
|
//! \b SYSCTL_PERIPH_I2C1, \b SYSCTL_PERIPH_I2S0, \b SYSCTL_PERIPH_PWM,
|
|
//! \b SYSCTL_PERIPH_QEI0, \b SYSCTL_PERIPH_QEI1, \b SYSCTL_PERIPH_SSI0,
|
|
//! \b SYSCTL_PERIPH_SSI1, \b SYSCTL_PERIPH_TIMER0, \b SYSCTL_PERIPH_TIMER1,
|
|
//! \b SYSCTL_PERIPH_TIMER2, \b SYSCTL_PERIPH_TIMER3, \b SYSCTL_PERIPH_TEMP,
|
|
//! \b SYSCTL_PERIPH_UART0, \b SYSCTL_PERIPH_UART1, \b SYSCTL_PERIPH_UART2,
|
|
//! \b SYSCTL_PERIPH_UDMA, \b SYSCTL_PERIPH_USB0, \b SYSCTL_PERIPH_WDOG0, or
|
|
//! \b SYSCTL_PERIPH_WDOG1.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlPeripheralDisable(unsigned long ulPeripheral)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(SysCtlPeripheralValid(ulPeripheral));
|
|
|
|
//
|
|
// Disable this peripheral.
|
|
//
|
|
HWREG(g_pulRCGCRegs[SYSCTL_PERIPH_INDEX(ulPeripheral)]) &=
|
|
~SYSCTL_PERIPH_MASK(ulPeripheral);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables a peripheral in sleep mode.
|
|
//!
|
|
//! \param ulPeripheral is the peripheral to enable in sleep mode.
|
|
//!
|
|
//! This function allows a peripheral to continue operating when the processor
|
|
//! goes into sleep mode. Since the clocking configuration of the device does
|
|
//! not change, any peripheral can safely continue operating while the
|
|
//! processor is in sleep mode, and can therefore wake the processor from sleep
|
|
//! mode.
|
|
//!
|
|
//! Sleep mode clocking of peripherals must be enabled via
|
|
//! SysCtlPeripheralClockGating(); if disabled, the peripheral sleep mode
|
|
//! configuration is maintained but has no effect when sleep mode is entered.
|
|
//!
|
|
//! The \e ulPeripheral parameter must be only one of the following values:
|
|
//! \b SYSCTL_PERIPH_ADC0, \b SYSCTL_PERIPH_ADC1, \b SYSCTL_PERIPH_CAN0,
|
|
//! \b SYSCTL_PERIPH_CAN1, \b SYSCTL_PERIPH_CAN2, \b SYSCTL_PERIPH_COMP0,
|
|
//! \b SYSCTL_PERIPH_COMP1, \b SYSCTL_PERIPH_COMP2, \b SYSCTL_PERIPH_EPI0,
|
|
//! \b SYSCTL_PERIPH_ETH, \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB,
|
|
//! \b SYSCTL_PERIPH_GPIOC, \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE,
|
|
//! \b SYSCTL_PERIPH_GPIOF, \b SYSCTL_PERIPH_GPIOG, \b SYSCTL_PERIPH_GPIOH,
|
|
//! \b SYSCTL_PERIPH_GPIOJ, \b SYSCTL_PERIPH_HIBERNATE, \b SYSCTL_PERIPH_I2C0,
|
|
//! \b SYSCTL_PERIPH_I2C1, \b SYSCTL_PERIPH_I2S0, \b SYSCTL_PERIPH_PWM,
|
|
//! \b SYSCTL_PERIPH_QEI0, \b SYSCTL_PERIPH_QEI1, \b SYSCTL_PERIPH_SSI0,
|
|
//! \b SYSCTL_PERIPH_SSI1, \b SYSCTL_PERIPH_TIMER0, \b SYSCTL_PERIPH_TIMER1,
|
|
//! \b SYSCTL_PERIPH_TIMER2, \b SYSCTL_PERIPH_TIMER3, \b SYSCTL_PERIPH_TEMP,
|
|
//! \b SYSCTL_PERIPH_UART0, \b SYSCTL_PERIPH_UART1, \b SYSCTL_PERIPH_UART2,
|
|
//! \b SYSCTL_PERIPH_UDMA, \b SYSCTL_PERIPH_USB0, \b SYSCTL_PERIPH_WDOG0, or
|
|
//! \b SYSCTL_PERIPH_WDOG1.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlPeripheralSleepEnable(unsigned long ulPeripheral)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(SysCtlPeripheralValid(ulPeripheral));
|
|
|
|
//
|
|
// Enable this peripheral in sleep mode.
|
|
//
|
|
HWREG(g_pulSCGCRegs[SYSCTL_PERIPH_INDEX(ulPeripheral)]) |=
|
|
SYSCTL_PERIPH_MASK(ulPeripheral);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables a peripheral in sleep mode.
|
|
//!
|
|
//! \param ulPeripheral is the peripheral to disable in sleep mode.
|
|
//!
|
|
//! This function causes a peripheral to stop operating when the processor goes
|
|
//! into sleep mode. Disabling peripherals while in sleep mode helps to lower
|
|
//! the current draw of the device. If enabled (via SysCtlPeripheralEnable()),
|
|
//! the peripheral will automatically resume operation when the processor
|
|
//! leaves sleep mode, maintaining its entire state from before sleep mode was
|
|
//! entered.
|
|
//!
|
|
//! Sleep mode clocking of peripherals must be enabled via
|
|
//! SysCtlPeripheralClockGating(); if disabled, the peripheral sleep mode
|
|
//! configuration is maintained but has no effect when sleep mode is entered.
|
|
//!
|
|
//! The \e ulPeripheral parameter must be only one of the following values:
|
|
//! \b SYSCTL_PERIPH_ADC0, \b SYSCTL_PERIPH_ADC1, \b SYSCTL_PERIPH_CAN0,
|
|
//! \b SYSCTL_PERIPH_CAN1, \b SYSCTL_PERIPH_CAN2, \b SYSCTL_PERIPH_COMP0,
|
|
//! \b SYSCTL_PERIPH_COMP1, \b SYSCTL_PERIPH_COMP2, \b SYSCTL_PERIPH_EPI0,
|
|
//! \b SYSCTL_PERIPH_ETH, \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB,
|
|
//! \b SYSCTL_PERIPH_GPIOC, \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE,
|
|
//! \b SYSCTL_PERIPH_GPIOF, \b SYSCTL_PERIPH_GPIOG, \b SYSCTL_PERIPH_GPIOH,
|
|
//! \b SYSCTL_PERIPH_GPIOJ, \b SYSCTL_PERIPH_HIBERNATE, \b SYSCTL_PERIPH_I2C0,
|
|
//! \b SYSCTL_PERIPH_I2C1, \b SYSCTL_PERIPH_I2S0, \b SYSCTL_PERIPH_PWM,
|
|
//! \b SYSCTL_PERIPH_QEI0, \b SYSCTL_PERIPH_QEI1, \b SYSCTL_PERIPH_SSI0,
|
|
//! \b SYSCTL_PERIPH_SSI1, \b SYSCTL_PERIPH_TIMER0, \b SYSCTL_PERIPH_TIMER1,
|
|
//! \b SYSCTL_PERIPH_TIMER2, \b SYSCTL_PERIPH_TIMER3, \b SYSCTL_PERIPH_TEMP,
|
|
//! \b SYSCTL_PERIPH_UART0, \b SYSCTL_PERIPH_UART1, \b SYSCTL_PERIPH_UART2,
|
|
//! \b SYSCTL_PERIPH_UDMA, \b SYSCTL_PERIPH_USB0, \b SYSCTL_PERIPH_WDOG0, or
|
|
//! \b SYSCTL_PERIPH_WDOG1.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlPeripheralSleepDisable(unsigned long ulPeripheral)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(SysCtlPeripheralValid(ulPeripheral));
|
|
|
|
//
|
|
// Disable this peripheral in sleep mode.
|
|
//
|
|
HWREG(g_pulSCGCRegs[SYSCTL_PERIPH_INDEX(ulPeripheral)]) &=
|
|
~SYSCTL_PERIPH_MASK(ulPeripheral);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables a peripheral in deep-sleep mode.
|
|
//!
|
|
//! \param ulPeripheral is the peripheral to enable in deep-sleep mode.
|
|
//!
|
|
//! This function allows a peripheral to continue operating when the processor
|
|
//! goes into deep-sleep mode. Since the clocking configuration of the device
|
|
//! may change, not all peripherals can safely continue operating while the
|
|
//! processor is in sleep mode. Those that must run at a particular frequency
|
|
//! (such as a UART) will not work as expected if the clock changes. It is the
|
|
//! responsibility of the caller to make sensible choices.
|
|
//!
|
|
//! Deep-sleep mode clocking of peripherals must be enabled via
|
|
//! SysCtlPeripheralClockGating(); if disabled, the peripheral deep-sleep mode
|
|
//! configuration is maintained but has no effect when deep-sleep mode is
|
|
//! entered.
|
|
//!
|
|
//! The \e ulPeripheral parameter must be only one of the following values:
|
|
//! \b SYSCTL_PERIPH_ADC0, \b SYSCTL_PERIPH_ADC1, \b SYSCTL_PERIPH_CAN0,
|
|
//! \b SYSCTL_PERIPH_CAN1, \b SYSCTL_PERIPH_CAN2, \b SYSCTL_PERIPH_COMP0,
|
|
//! \b SYSCTL_PERIPH_COMP1, \b SYSCTL_PERIPH_COMP2, \b SYSCTL_PERIPH_EPI0,
|
|
//! \b SYSCTL_PERIPH_ETH, \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB,
|
|
//! \b SYSCTL_PERIPH_GPIOC, \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE,
|
|
//! \b SYSCTL_PERIPH_GPIOF, \b SYSCTL_PERIPH_GPIOG, \b SYSCTL_PERIPH_GPIOH,
|
|
//! \b SYSCTL_PERIPH_GPIOJ, \b SYSCTL_PERIPH_HIBERNATE, \b SYSCTL_PERIPH_I2C0,
|
|
//! \b SYSCTL_PERIPH_I2C1, \b SYSCTL_PERIPH_I2S0, \b SYSCTL_PERIPH_PWM,
|
|
//! \b SYSCTL_PERIPH_QEI0, \b SYSCTL_PERIPH_QEI1, \b SYSCTL_PERIPH_SSI0,
|
|
//! \b SYSCTL_PERIPH_SSI1, \b SYSCTL_PERIPH_TIMER0, \b SYSCTL_PERIPH_TIMER1,
|
|
//! \b SYSCTL_PERIPH_TIMER2, \b SYSCTL_PERIPH_TIMER3, \b SYSCTL_PERIPH_TEMP,
|
|
//! \b SYSCTL_PERIPH_UART0, \b SYSCTL_PERIPH_UART1, \b SYSCTL_PERIPH_UART2,
|
|
//! \b SYSCTL_PERIPH_UDMA, \b SYSCTL_PERIPH_USB0, \b SYSCTL_PERIPH_WDOG0, or
|
|
//! \b SYSCTL_PERIPH_WDOG1.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlPeripheralDeepSleepEnable(unsigned long ulPeripheral)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(SysCtlPeripheralValid(ulPeripheral));
|
|
|
|
//
|
|
// Enable this peripheral in deep-sleep mode.
|
|
//
|
|
HWREG(g_pulDCGCRegs[SYSCTL_PERIPH_INDEX(ulPeripheral)]) |=
|
|
SYSCTL_PERIPH_MASK(ulPeripheral);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables a peripheral in deep-sleep mode.
|
|
//!
|
|
//! \param ulPeripheral is the peripheral to disable in deep-sleep mode.
|
|
//!
|
|
//! This function causes a peripheral to stop operating when the processor goes
|
|
//! into deep-sleep mode. Disabling peripherals while in deep-sleep mode helps
|
|
//! to lower the current draw of the device, and can keep peripherals that
|
|
//! require a particular clock frequency from operating when the clock changes
|
|
//! as a result of entering deep-sleep mode. If enabled (via
|
|
//! SysCtlPeripheralEnable()), the peripheral will automatically resume
|
|
//! operation when the processor leaves deep-sleep mode, maintaining its entire
|
|
//! state from before deep-sleep mode was entered.
|
|
//!
|
|
//! Deep-sleep mode clocking of peripherals must be enabled via
|
|
//! SysCtlPeripheralClockGating(); if disabled, the peripheral deep-sleep mode
|
|
//! configuration is maintained but has no effect when deep-sleep mode is
|
|
//! entered.
|
|
//!
|
|
//! The \e ulPeripheral parameter must be only one of the following values:
|
|
//! \b SYSCTL_PERIPH_ADC0, \b SYSCTL_PERIPH_ADC1, \b SYSCTL_PERIPH_CAN0,
|
|
//! \b SYSCTL_PERIPH_CAN1, \b SYSCTL_PERIPH_CAN2, \b SYSCTL_PERIPH_COMP0,
|
|
//! \b SYSCTL_PERIPH_COMP1, \b SYSCTL_PERIPH_COMP2, \b SYSCTL_PERIPH_EPI0,
|
|
//! \b SYSCTL_PERIPH_ETH, \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB,
|
|
//! \b SYSCTL_PERIPH_GPIOC, \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE,
|
|
//! \b SYSCTL_PERIPH_GPIOF, \b SYSCTL_PERIPH_GPIOG, \b SYSCTL_PERIPH_GPIOH,
|
|
//! \b SYSCTL_PERIPH_GPIOJ, \b SYSCTL_PERIPH_HIBERNATE, \b SYSCTL_PERIPH_I2C0,
|
|
//! \b SYSCTL_PERIPH_I2C1, \b SYSCTL_PERIPH_I2S0, \b SYSCTL_PERIPH_PWM,
|
|
//! \b SYSCTL_PERIPH_QEI0, \b SYSCTL_PERIPH_QEI1, \b SYSCTL_PERIPH_SSI0,
|
|
//! \b SYSCTL_PERIPH_SSI1, \b SYSCTL_PERIPH_TIMER0, \b SYSCTL_PERIPH_TIMER1,
|
|
//! \b SYSCTL_PERIPH_TIMER2, \b SYSCTL_PERIPH_TIMER3, \b SYSCTL_PERIPH_TEMP,
|
|
//! \b SYSCTL_PERIPH_UART0, \b SYSCTL_PERIPH_UART1, \b SYSCTL_PERIPH_UART2,
|
|
//! \b SYSCTL_PERIPH_UDMA, \b SYSCTL_PERIPH_USB0, \b SYSCTL_PERIPH_WDOG0, or
|
|
//! \b SYSCTL_PERIPH_WDOG1.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlPeripheralDeepSleepDisable(unsigned long ulPeripheral)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(SysCtlPeripheralValid(ulPeripheral));
|
|
|
|
//
|
|
// Disable this peripheral in deep-sleep mode.
|
|
//
|
|
HWREG(g_pulDCGCRegs[SYSCTL_PERIPH_INDEX(ulPeripheral)]) &=
|
|
~SYSCTL_PERIPH_MASK(ulPeripheral);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Controls peripheral clock gating in sleep and deep-sleep mode.
|
|
//!
|
|
//! \param bEnable is a boolean that is \b true if the sleep and deep-sleep
|
|
//! peripheral configuration should be used and \b false if not.
|
|
//!
|
|
//! This function controls how peripherals are clocked when the processor goes
|
|
//! into sleep or deep-sleep mode. By default, the peripherals are clocked the
|
|
//! same as in run mode; if peripheral clock gating is enabled they are clocked
|
|
//! according to the configuration set by SysCtlPeripheralSleepEnable(),
|
|
//! SysCtlPeripheralSleepDisable(), SysCtlPeripheralDeepSleepEnable(), and
|
|
//! SysCtlPeripheralDeepSleepDisable().
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlPeripheralClockGating(tBoolean bEnable)
|
|
{
|
|
//
|
|
// Enable peripheral clock gating as requested.
|
|
//
|
|
if(bEnable)
|
|
{
|
|
HWREG(SYSCTL_RCC) |= SYSCTL_RCC_ACG;
|
|
}
|
|
else
|
|
{
|
|
HWREG(SYSCTL_RCC) &= ~(SYSCTL_RCC_ACG);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Registers an interrupt handler for the system control interrupt.
|
|
//!
|
|
//! \param pfnHandler is a pointer to the function to be called when the system
|
|
//! control interrupt occurs.
|
|
//!
|
|
//! This sets the handler to be called when a system control interrupt occurs.
|
|
//! This will enable the global interrupt in the interrupt controller; specific
|
|
//! system control interrupts must be enabled via SysCtlIntEnable(). It is the
|
|
//! interrupt handler's responsibility to clear the interrupt source via
|
|
//! SysCtlIntClear().
|
|
//!
|
|
//! System control can generate interrupts when the PLL achieves lock, if the
|
|
//! internal LDO current limit is exceeded, if the internal oscillator fails,
|
|
//! if the main oscillator fails, if the internal LDO output voltage droops too
|
|
//! much, if the external voltage droops too much, or if the PLL fails.
|
|
//!
|
|
//! \sa IntRegister() for important information about registering interrupt
|
|
//! handlers.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlIntRegister(void (*pfnHandler)(void))
|
|
{
|
|
//
|
|
// Register the interrupt handler, returning an error if an error occurs.
|
|
//
|
|
IntRegister(INT_SYSCTL, pfnHandler);
|
|
|
|
//
|
|
// Enable the system control interrupt.
|
|
//
|
|
IntEnable(INT_SYSCTL);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Unregisters the interrupt handler for the system control interrupt.
|
|
//!
|
|
//! This function will clear the handler to be called when a system control
|
|
//! interrupt occurs. This will also mask off the interrupt in the interrupt
|
|
//! controller so that the interrupt handler no longer is called.
|
|
//!
|
|
//! \sa IntRegister() for important information about registering interrupt
|
|
//! handlers.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlIntUnregister(void)
|
|
{
|
|
//
|
|
// Disable the interrupt.
|
|
//
|
|
IntDisable(INT_SYSCTL);
|
|
|
|
//
|
|
// Unregister the interrupt handler.
|
|
//
|
|
IntUnregister(INT_SYSCTL);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables individual system control interrupt sources.
|
|
//!
|
|
//! \param ulInts is a bit mask of the interrupt sources to be enabled. Must
|
|
//! be a logical OR of \b SYSCTL_INT_PLL_LOCK, \b SYSCTL_INT_CUR_LIMIT,
|
|
//! \b SYSCTL_INT_IOSC_FAIL, \b SYSCTL_INT_MOSC_FAIL, \b SYSCTL_INT_POR,
|
|
//! \b SYSCTL_INT_BOR, and/or \b SYSCTL_INT_PLL_FAIL.
|
|
//!
|
|
//! Enables the indicated system control interrupt sources. Only the sources
|
|
//! that are enabled can be reflected to the processor interrupt; disabled
|
|
//! sources have no effect on the processor.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlIntEnable(unsigned long ulInts)
|
|
{
|
|
//
|
|
// Enable the specified interrupts.
|
|
//
|
|
HWREG(SYSCTL_IMC) |= ulInts;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables individual system control interrupt sources.
|
|
//!
|
|
//! \param ulInts is a bit mask of the interrupt sources to be disabled. Must
|
|
//! be a logical OR of \b SYSCTL_INT_PLL_LOCK, \b SYSCTL_INT_CUR_LIMIT,
|
|
//! \b SYSCTL_INT_IOSC_FAIL, \b SYSCTL_INT_MOSC_FAIL, \b SYSCTL_INT_POR,
|
|
//! \b SYSCTL_INT_BOR, and/or \b SYSCTL_INT_PLL_FAIL.
|
|
//!
|
|
//! Disables the indicated system control interrupt sources. Only the sources
|
|
//! that are enabled can be reflected to the processor interrupt; disabled
|
|
//! sources have no effect on the processor.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlIntDisable(unsigned long ulInts)
|
|
{
|
|
//
|
|
// Disable the specified interrupts.
|
|
//
|
|
HWREG(SYSCTL_IMC) &= ~(ulInts);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Clears system control interrupt sources.
|
|
//!
|
|
//! \param ulInts is a bit mask of the interrupt sources to be cleared. Must
|
|
//! be a logical OR of \b SYSCTL_INT_PLL_LOCK, \b SYSCTL_INT_CUR_LIMIT,
|
|
//! \b SYSCTL_INT_IOSC_FAIL, \b SYSCTL_INT_MOSC_FAIL, \b SYSCTL_INT_POR,
|
|
//! \b SYSCTL_INT_BOR, and/or \b SYSCTL_INT_PLL_FAIL.
|
|
//!
|
|
//! The specified system control interrupt sources are cleared, so that they no
|
|
//! longer assert. This must be done in the interrupt handler to keep it from
|
|
//! being called again immediately upon exit.
|
|
//!
|
|
//! \note Because there is a write buffer in the Cortex-M3 processor, it may
|
|
//! take several clock cycles before the interrupt source is actually cleared.
|
|
//! Therefore, it is recommended that the interrupt source be cleared early in
|
|
//! the interrupt handler (as opposed to the very last action) to avoid
|
|
//! returning from the interrupt handler before the interrupt source is
|
|
//! actually cleared. Failure to do so may result in the interrupt handler
|
|
//! being immediately reentered (because the interrupt controller still sees
|
|
//! the interrupt source asserted).
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlIntClear(unsigned long ulInts)
|
|
{
|
|
//
|
|
// Clear the requested interrupt sources.
|
|
//
|
|
HWREG(SYSCTL_MISC) = ulInts;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the current interrupt status.
|
|
//!
|
|
//! \param bMasked is false if the raw interrupt status is required and true if
|
|
//! the masked interrupt status is required.
|
|
//!
|
|
//! This returns the interrupt status for the system controller. Either the
|
|
//! raw interrupt status or the status of interrupts that are allowed to
|
|
//! reflect to the processor can be returned.
|
|
//!
|
|
//! \return The current interrupt status, enumerated as a bit field of
|
|
//! \b SYSCTL_INT_PLL_LOCK, \b SYSCTL_INT_CUR_LIMIT, \b SYSCTL_INT_IOSC_FAIL,
|
|
//! \b SYSCTL_INT_MOSC_FAIL, \b SYSCTL_INT_POR, \b SYSCTL_INT_BOR, and
|
|
//! \b SYSCTL_INT_PLL_FAIL.
|
|
//
|
|
//*****************************************************************************
|
|
unsigned long
|
|
SysCtlIntStatus(tBoolean bMasked)
|
|
{
|
|
//
|
|
// Return either the interrupt status or the raw interrupt status as
|
|
// requested.
|
|
//
|
|
if(bMasked)
|
|
{
|
|
return(HWREG(SYSCTL_MISC));
|
|
}
|
|
else
|
|
{
|
|
return(HWREG(SYSCTL_RIS));
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the output voltage of the LDO.
|
|
//!
|
|
//! \param ulVoltage is the required output voltage from the LDO. Must be one
|
|
//! of \b SYSCTL_LDO_2_25V, \b SYSCTL_LDO_2_30V, \b SYSCTL_LDO_2_35V,
|
|
//! \b SYSCTL_LDO_2_40V, \b SYSCTL_LDO_2_45V, \b SYSCTL_LDO_2_50V,
|
|
//! \b SYSCTL_LDO_2_55V, \b SYSCTL_LDO_2_60V, \b SYSCTL_LDO_2_65V,
|
|
//! \b SYSCTL_LDO_2_70V, or \b SYSCTL_LDO_2_75V.
|
|
//!
|
|
//! This function sets the output voltage of the LDO. The default voltage is
|
|
//! 2.5 V; it can be adjusted +/- 10%.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlLDOSet(unsigned long ulVoltage)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT((ulVoltage == SYSCTL_LDO_2_25V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_30V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_35V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_40V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_45V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_50V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_55V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_60V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_65V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_70V) ||
|
|
(ulVoltage == SYSCTL_LDO_2_75V));
|
|
|
|
//
|
|
// Set the LDO voltage to the requested value.
|
|
//
|
|
HWREG(SYSCTL_LDOPCTL) = ulVoltage;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the output voltage of the LDO.
|
|
//!
|
|
//! This function determines the output voltage of the LDO, as specified by the
|
|
//! control register.
|
|
//!
|
|
//! \return Returns the current voltage of the LDO; will be one of
|
|
//! \b SYSCTL_LDO_2_25V, \b SYSCTL_LDO_2_30V, \b SYSCTL_LDO_2_35V,
|
|
//! \b SYSCTL_LDO_2_40V, \b SYSCTL_LDO_2_45V, \b SYSCTL_LDO_2_50V,
|
|
//! \b SYSCTL_LDO_2_55V, \b SYSCTL_LDO_2_60V, \b SYSCTL_LDO_2_65V,
|
|
//! \b SYSCTL_LDO_2_70V, or \b SYSCTL_LDO_2_75V.
|
|
//
|
|
//*****************************************************************************
|
|
unsigned long
|
|
SysCtlLDOGet(void)
|
|
{
|
|
//
|
|
// Return the LDO voltage setting.
|
|
//
|
|
return(HWREG(SYSCTL_LDOPCTL));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Configures the LDO failure control.
|
|
//!
|
|
//! \param ulConfig is the required LDO failure control setting; can be either
|
|
//! \b SYSCTL_LDOCFG_ARST or \b SYSCTL_LDOCFG_NORST.
|
|
//!
|
|
//! This function allows the LDO to be configured to cause a processor reset
|
|
//! when the output voltage becomes unregulated.
|
|
//!
|
|
//! The LDO failure control is only available on Sandstorm-class devices.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlLDOConfigSet(unsigned long ulConfig)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT((ulConfig == SYSCTL_LDOCFG_ARST) ||
|
|
(ulConfig == SYSCTL_LDOCFG_NORST));
|
|
|
|
//
|
|
// Set the reset control as requested.
|
|
//
|
|
HWREG(SYSCTL_LDOARST) = ulConfig;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Resets the device.
|
|
//!
|
|
//! This function will perform a software reset of the entire device. The
|
|
//! processor and all peripherals will be reset and all device registers will
|
|
//! return to their default values (with the exception of the reset cause
|
|
//! register, which will maintain its current value but have the software reset
|
|
//! bit set as well).
|
|
//!
|
|
//! \return This function does not return.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlReset(void)
|
|
{
|
|
//
|
|
// Perform a software reset request. This will cause the device to reset,
|
|
// no further code will be executed.
|
|
//
|
|
HWREG(NVIC_APINT) = NVIC_APINT_VECTKEY | NVIC_APINT_SYSRESETREQ;
|
|
|
|
//
|
|
// The device should have reset, so this should never be reached. Just in
|
|
// case, loop forever.
|
|
//
|
|
while(1)
|
|
{
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Puts the processor into sleep mode.
|
|
//!
|
|
//! This function places the processor into sleep mode; it will not return
|
|
//! until the processor returns to run mode. The peripherals that are enabled
|
|
//! via SysCtlPeripheralSleepEnable() continue to operate and can wake up the
|
|
//! processor (if automatic clock gating is enabled with
|
|
//! SysCtlPeripheralClockGating(), otherwise all peripherals continue to
|
|
//! operate).
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlSleep(void)
|
|
{
|
|
//
|
|
// Wait for an interrupt.
|
|
//
|
|
CPUwfi();
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Puts the processor into deep-sleep mode.
|
|
//!
|
|
//! This function places the processor into deep-sleep mode; it will not return
|
|
//! until the processor returns to run mode. The peripherals that are enabled
|
|
//! via SysCtlPeripheralDeepSleepEnable() continue to operate and can wake up
|
|
//! the processor (if automatic clock gating is enabled with
|
|
//! SysCtlPeripheralClockGating(), otherwise all peripherals continue to
|
|
//! operate).
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlDeepSleep(void)
|
|
{
|
|
//
|
|
// Enable deep-sleep.
|
|
//
|
|
HWREG(NVIC_SYS_CTRL) |= NVIC_SYS_CTRL_SLEEPDEEP;
|
|
|
|
//
|
|
// Wait for an interrupt.
|
|
//
|
|
CPUwfi();
|
|
|
|
//
|
|
// Disable deep-sleep so that a future sleep will work correctly.
|
|
//
|
|
HWREG(NVIC_SYS_CTRL) &= ~(NVIC_SYS_CTRL_SLEEPDEEP);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the reason for a reset.
|
|
//!
|
|
//! This function will return the reason(s) for a reset. Since the reset
|
|
//! reasons are sticky until either cleared by software or an external reset,
|
|
//! multiple reset reasons may be returned if multiple resets have occurred.
|
|
//! The reset reason will be a logical OR of \b SYSCTL_CAUSE_LDO,
|
|
//! \b SYSCTL_CAUSE_SW, \b SYSCTL_CAUSE_WDOG, \b SYSCTL_CAUSE_BOR,
|
|
//! \b SYSCTL_CAUSE_POR, and/or \b SYSCTL_CAUSE_EXT.
|
|
//!
|
|
//! \return Returns the reason(s) for a reset.
|
|
//
|
|
//*****************************************************************************
|
|
unsigned long
|
|
SysCtlResetCauseGet(void)
|
|
{
|
|
//
|
|
// Return the reset reasons.
|
|
//
|
|
return(HWREG(SYSCTL_RESC));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Clears reset reasons.
|
|
//!
|
|
//! \param ulCauses are the reset causes to be cleared; must be a logical OR of
|
|
//! \b SYSCTL_CAUSE_LDO, \b SYSCTL_CAUSE_SW, \b SYSCTL_CAUSE_WDOG,
|
|
//! \b SYSCTL_CAUSE_BOR, \b SYSCTL_CAUSE_POR, and/or \b SYSCTL_CAUSE_EXT.
|
|
//!
|
|
//! This function clears the specified sticky reset reasons. Once cleared,
|
|
//! another reset for the same reason can be detected, and a reset for a
|
|
//! different reason can be distinguished (instead of having two reset causes
|
|
//! set). If the reset reason is used by an application, all reset causes
|
|
//! should be cleared after they are retrieved with SysCtlResetCauseGet().
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlResetCauseClear(unsigned long ulCauses)
|
|
{
|
|
//
|
|
// Clear the given reset reasons.
|
|
//
|
|
HWREG(SYSCTL_RESC) &= ~(ulCauses);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Configures the brown-out control.
|
|
//!
|
|
//! \param ulConfig is the desired configuration of the brown-out control.
|
|
//! Must be the logical OR of \b SYSCTL_BOR_RESET and/or
|
|
//! \b SYSCTL_BOR_RESAMPLE.
|
|
//! \param ulDelay is the number of internal oscillator cycles to wait before
|
|
//! resampling an asserted brown-out signal. This value only has meaning when
|
|
//! \b SYSCTL_BOR_RESAMPLE is set and must be less than 8192.
|
|
//!
|
|
//! This function configures how the brown-out control operates. It can detect
|
|
//! a brown-out by looking at only the brown-out output, or it can wait for it
|
|
//! to be active for two consecutive samples separated by a configurable time.
|
|
//! When it detects a brown-out condition, it can either reset the device or
|
|
//! generate a processor interrupt.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlBrownOutConfigSet(unsigned long ulConfig, unsigned long ulDelay)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(!(ulConfig & ~(SYSCTL_BOR_RESET | SYSCTL_BOR_RESAMPLE)));
|
|
ASSERT(ulDelay < 8192);
|
|
|
|
//
|
|
// Configure the brown-out reset control.
|
|
//
|
|
HWREG(SYSCTL_PBORCTL) = (ulDelay << SYSCTL_PBORCTL_BORTIM_S) | ulConfig;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Provides a small delay.
|
|
//!
|
|
//! \param ulCount is the number of delay loop iterations to perform.
|
|
//!
|
|
//! This function provides a means of generating a constant length delay. It
|
|
//! is written in assembly to keep the delay consistent across tool chains,
|
|
//! avoiding the need to tune the delay based on the tool chain in use.
|
|
//!
|
|
//! The loop takes 3 cycles/loop.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
#if defined(ewarm) || defined(DOXYGEN)
|
|
void
|
|
SysCtlDelay(unsigned long ulCount)
|
|
{
|
|
__asm(" subs r0, #1\n"
|
|
" bne.n SysCtlDelay\n"
|
|
" bx lr");
|
|
}
|
|
#endif
|
|
#if defined(codered) || defined(gcc) || defined(sourcerygxx)
|
|
void __attribute__((naked))
|
|
SysCtlDelay(unsigned long ulCount)
|
|
{
|
|
__asm(" subs r0, #1\n"
|
|
" bne SysCtlDelay\n"
|
|
" bx lr");
|
|
}
|
|
#endif
|
|
#if defined(rvmdk) || defined(__ARMCC_VERSION)
|
|
__asm void
|
|
SysCtlDelay(unsigned long ulCount)
|
|
{
|
|
subs r0, #1;
|
|
bne SysCtlDelay;
|
|
bx lr;
|
|
}
|
|
#endif
|
|
//
|
|
// For CCS implement this function in pure assembly. This prevents the TI
|
|
// compiler from doing funny things with the optimizer.
|
|
//
|
|
#if defined(ccs)
|
|
__asm(" .sect \".text:SysCtlDelay\"\n"
|
|
" .clink\n"
|
|
" .thumbfunc SysCtlDelay\n"
|
|
" .thumb\n"
|
|
" .global SysCtlDelay\n"
|
|
"SysCtlDelay:\n"
|
|
" subs r0, #1\n"
|
|
" bne.n SysCtlDelay\n"
|
|
" bx lr\n");
|
|
#endif
|
|
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the clocking of the device.
|
|
//!
|
|
//! \param ulConfig is the required configuration of the device clocking.
|
|
//!
|
|
//! This function configures the clocking of the device. The input crystal
|
|
//! frequency, oscillator to be used, use of the PLL, and the system clock
|
|
//! divider are all configured with this function.
|
|
//!
|
|
//! The \e ulConfig parameter is the logical OR of several different values,
|
|
//! many of which are grouped into sets where only one can be chosen.
|
|
//!
|
|
//! The system clock divider is chosen with one of the following values:
|
|
//! \b SYSCTL_SYSDIV_1, \b SYSCTL_SYSDIV_2, \b SYSCTL_SYSDIV_3, ...
|
|
//! \b SYSCTL_SYSDIV_64. Only \b SYSCTL_SYSDIV_1 through \b SYSCTL_SYSDIV_16
|
|
//! are valid on Sandstorm-class devices.
|
|
//!
|
|
//! The use of the PLL is chosen with either \b SYSCTL_USE_PLL or
|
|
//! \b SYSCTL_USE_OSC.
|
|
//!
|
|
//! The external crystal frequency is chosen with one of the following values:
|
|
//! \b SYSCTL_XTAL_1MHZ, \b SYSCTL_XTAL_1_84MHZ, \b SYSCTL_XTAL_2MHZ,
|
|
//! \b SYSCTL_XTAL_2_45MHZ, \b SYSCTL_XTAL_3_57MHZ, \b SYSCTL_XTAL_3_68MHZ,
|
|
//! \b SYSCTL_XTAL_4MHZ, \b SYSCTL_XTAL_4_09MHZ, \b SYSCTL_XTAL_4_91MHZ,
|
|
//! \b SYSCTL_XTAL_5MHZ, \b SYSCTL_XTAL_5_12MHZ, \b SYSCTL_XTAL_6MHZ,
|
|
//! \b SYSCTL_XTAL_6_14MHZ, \b SYSCTL_XTAL_7_37MHZ, \b SYSCTL_XTAL_8MHZ,
|
|
//! \b SYSCTL_XTAL_8_19MHZ, \b SYSCTL_XTAL_10MHZ, \b SYSCTL_XTAL_12MHZ,
|
|
//! \b SYSCTL_XTAL_12_2MHZ, \b SYSCTL_XTAL_13_5MHZ, \b SYSCTL_XTAL_14_3MHZ,
|
|
//! \b SYSCTL_XTAL_16MHZ, or \b SYSCTL_XTAL_16_3MHZ. Values below
|
|
//! \b SYSCTL_XTAL_3_57MHZ are not valid when the PLL is in operation. On
|
|
//! Sandstorm- and Fury-class devices, values above \b SYSCTL_XTAL_8_19MHZ are
|
|
//! not valid.
|
|
//!
|
|
//! The oscillator source is chosen with one of the following values:
|
|
//! \b SYSCTL_OSC_MAIN, \b SYSCTL_OSC_INT, \b SYSCTL_OSC_INT4,
|
|
//! \b SYSCTL_OSC_INT30, or \b SYSCTL_OSC_EXT32. On Sandstorm-class devices,
|
|
//! \b SYSCTL_OSC_INT30 and \b SYSCTL_OSC_EXT32 are not valid.
|
|
//! \b SYSCTL_OSC_EXT32 is only available on devices with the hibernate module,
|
|
//! and then only when the hibernate module has been enabled.
|
|
//!
|
|
//! The internal and main oscillators are disabled with the
|
|
//! \b SYSCTL_INT_OSC_DIS and \b SYSCTL_MAIN_OSC_DIS flags, respectively.
|
|
//! The external oscillator must be enabled in order to use an external clock
|
|
//! source. Note that attempts to disable the oscillator used to clock the
|
|
//! device will be prevented by the hardware.
|
|
//!
|
|
//! To clock the system from an external source (such as an external crystal
|
|
//! oscillator), use \b SYSCTL_USE_OSC \b | \b SYSCTL_OSC_MAIN. To clock the
|
|
//! system from the main oscillator, use \b SYSCTL_USE_OSC \b |
|
|
//! \b SYSCTL_OSC_MAIN. To clock the system from the PLL, use
|
|
//! \b SYSCTL_USE_PLL \b | \b SYSCTL_OSC_MAIN, and select the appropriate
|
|
//! crystal with one of the \b SYSCTL_XTAL_xxx values.
|
|
//!
|
|
//! \note If selecting the PLL as the system clock source (that is, via
|
|
//! \b SYSCTL_USE_PLL), this function will poll the PLL lock interrupt to
|
|
//! determine when the PLL has locked. If an interrupt handler for the
|
|
//! system control interrupt is in place, and it responds to and clears the
|
|
//! PLL lock interrupt, this function will delay until its timeout has occurred
|
|
//! instead of completing as soon as PLL lock is achieved.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlClockSet(unsigned long ulConfig)
|
|
{
|
|
unsigned long ulDelay, ulRCC, ulRCC2;
|
|
|
|
//
|
|
// See if this is a Sandstorm-class device and clocking features from newer
|
|
// devices were requested.
|
|
//
|
|
if(CLASS_IS_SANDSTORM && (ulConfig & SYSCTL_RCC2_USERCC2))
|
|
{
|
|
//
|
|
// Return without changing the clocking since the requested
|
|
// configuration can not be achieved.
|
|
//
|
|
return;
|
|
}
|
|
|
|
//
|
|
// Get the current value of the RCC and RCC2 registers. If using a
|
|
// Sandstorm-class device, the RCC2 register will read back as zero and the
|
|
// writes to it from within this function will be ignored.
|
|
//
|
|
ulRCC = HWREG(SYSCTL_RCC);
|
|
ulRCC2 = HWREG(SYSCTL_RCC2);
|
|
|
|
//
|
|
// Bypass the PLL and system clock dividers for now.
|
|
//
|
|
ulRCC |= SYSCTL_RCC_BYPASS;
|
|
ulRCC &= ~(SYSCTL_RCC_USESYSDIV);
|
|
ulRCC2 |= SYSCTL_RCC2_BYPASS2;
|
|
|
|
//
|
|
// Write the new RCC value.
|
|
//
|
|
HWREG(SYSCTL_RCC) = ulRCC;
|
|
HWREG(SYSCTL_RCC2) = ulRCC2;
|
|
|
|
//
|
|
// See if either oscillator needs to be enabled.
|
|
//
|
|
if(((ulRCC & SYSCTL_RCC_IOSCDIS) && !(ulConfig & SYSCTL_RCC_IOSCDIS)) ||
|
|
((ulRCC & SYSCTL_RCC_MOSCDIS) && !(ulConfig & SYSCTL_RCC_MOSCDIS)))
|
|
{
|
|
//
|
|
// Make sure that the required oscillators are enabled. For now, the
|
|
// previously enabled oscillators must be enabled along with the newly
|
|
// requested oscillators.
|
|
//
|
|
ulRCC &= (~(SYSCTL_RCC_IOSCDIS | SYSCTL_RCC_MOSCDIS) |
|
|
(ulConfig & (SYSCTL_RCC_IOSCDIS | SYSCTL_RCC_MOSCDIS)));
|
|
|
|
//
|
|
// Write the new RCC value.
|
|
//
|
|
HWREG(SYSCTL_RCC) = ulRCC;
|
|
|
|
//
|
|
// Wait for a bit, giving the oscillator time to stabilize. The number
|
|
// of iterations is adjusted based on the current clock source; a
|
|
// smaller number of iterations is required for slower clock rates.
|
|
//
|
|
if(((ulRCC2 & SYSCTL_RCC2_USERCC2) &&
|
|
(((ulRCC2 & SYSCTL_RCC2_OSCSRC2_M) == SYSCTL_RCC2_OSCSRC2_30) ||
|
|
((ulRCC2 & SYSCTL_RCC2_OSCSRC2_M) == SYSCTL_RCC2_OSCSRC2_32))) ||
|
|
(!(ulRCC2 & SYSCTL_RCC2_USERCC2) &&
|
|
((ulRCC & SYSCTL_RCC_OSCSRC_M) == SYSCTL_RCC_OSCSRC_30)))
|
|
{
|
|
//
|
|
// Delay for 4096 iterations.
|
|
//
|
|
SysCtlDelay(4096);
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// Delay for 524,288 iterations.
|
|
//
|
|
SysCtlDelay(524288);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Set the new crystal value, oscillator source, and PLL configuration.
|
|
// Since the OSCSRC2 field in RCC2 overlaps the XTAL field in RCC, the
|
|
// OSCSRC field has a special encoding within ulConfig to avoid the
|
|
// overlap.
|
|
//
|
|
ulRCC &= ~(SYSCTL_RCC_XTAL_M | SYSCTL_RCC_OSCSRC_M |
|
|
SYSCTL_RCC_PWRDN | SYSCTL_RCC_OEN);
|
|
ulRCC |= ulConfig & (SYSCTL_RCC_XTAL_M | SYSCTL_RCC_OSCSRC_M |
|
|
SYSCTL_RCC_PWRDN | SYSCTL_RCC_OEN);
|
|
ulRCC2 &= ~(SYSCTL_RCC2_USERCC2 | SYSCTL_RCC2_OSCSRC2_M |
|
|
SYSCTL_RCC2_PWRDN2);
|
|
ulRCC2 |= ulConfig & (SYSCTL_RCC2_USERCC2 | SYSCTL_RCC_OSCSRC_M |
|
|
SYSCTL_RCC2_PWRDN2);
|
|
ulRCC2 |= (ulConfig & 0x00000008) << 3;
|
|
|
|
//
|
|
// Clear the PLL lock interrupt.
|
|
//
|
|
HWREG(SYSCTL_MISC) = SYSCTL_INT_PLL_LOCK;
|
|
|
|
//
|
|
// Write the new RCC value.
|
|
//
|
|
if(ulRCC2 & SYSCTL_RCC2_USERCC2)
|
|
{
|
|
HWREG(SYSCTL_RCC2) = ulRCC2;
|
|
HWREG(SYSCTL_RCC) = ulRCC;
|
|
}
|
|
else
|
|
{
|
|
HWREG(SYSCTL_RCC) = ulRCC;
|
|
HWREG(SYSCTL_RCC2) = ulRCC2;
|
|
}
|
|
|
|
//
|
|
// Wait for a bit so that new crystal value and oscillator source can take
|
|
// effect.
|
|
//
|
|
SysCtlDelay(16);
|
|
|
|
//
|
|
// Set the requested system divider and disable the appropriate
|
|
// oscillators. This will not get written immediately.
|
|
//
|
|
ulRCC &= ~(SYSCTL_RCC_SYSDIV_M | SYSCTL_RCC_USESYSDIV |
|
|
SYSCTL_RCC_IOSCDIS | SYSCTL_RCC_MOSCDIS);
|
|
ulRCC |= ulConfig & (SYSCTL_RCC_SYSDIV_M | SYSCTL_RCC_USESYSDIV |
|
|
SYSCTL_RCC_IOSCDIS | SYSCTL_RCC_MOSCDIS);
|
|
ulRCC2 &= ~(SYSCTL_RCC2_SYSDIV2_M);
|
|
ulRCC2 |= ulConfig & SYSCTL_RCC2_SYSDIV2_M;
|
|
if(ulConfig & SYSCTL_RCC2_DIV400)
|
|
{
|
|
ulRCC |= SYSCTL_RCC_USESYSDIV;
|
|
ulRCC2 &= ~(SYSCTL_RCC_USESYSDIV);
|
|
ulRCC2 |= ulConfig & (SYSCTL_RCC2_DIV400 | SYSCTL_RCC2_SYSDIV2LSB);
|
|
}
|
|
else
|
|
{
|
|
ulRCC2 &= ~(SYSCTL_RCC2_DIV400);
|
|
}
|
|
|
|
//
|
|
// See if the PLL output is being used to clock the system.
|
|
//
|
|
if(!(ulConfig & SYSCTL_RCC_BYPASS))
|
|
{
|
|
//
|
|
// Wait until the PLL has locked.
|
|
//
|
|
for(ulDelay = 32768; ulDelay > 0; ulDelay--)
|
|
{
|
|
if(HWREG(SYSCTL_RIS) & SYSCTL_INT_PLL_LOCK)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Enable use of the PLL.
|
|
//
|
|
ulRCC &= ~(SYSCTL_RCC_BYPASS);
|
|
ulRCC2 &= ~(SYSCTL_RCC2_BYPASS2);
|
|
}
|
|
|
|
//
|
|
// Write the final RCC value.
|
|
//
|
|
HWREG(SYSCTL_RCC) = ulRCC;
|
|
HWREG(SYSCTL_RCC2) = ulRCC2;
|
|
|
|
//
|
|
// Delay for a little bit so that the system divider takes effect.
|
|
//
|
|
SysCtlDelay(16);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the processor clock rate.
|
|
//!
|
|
//! This function determines the clock rate of the processor clock. This is
|
|
//! also the clock rate of all the peripheral modules (with the exception of
|
|
//! PWM, which has its own clock divider).
|
|
//!
|
|
//! \note This will not return accurate results if SysCtlClockSet() has not
|
|
//! been called to configure the clocking of the device, or if the device is
|
|
//! directly clocked from a crystal (or a clock source) that is not one of the
|
|
//! supported crystal frequencies. In the later case, this function should be
|
|
//! modified to directly return the correct system clock rate.
|
|
//!
|
|
//! \return The processor clock rate.
|
|
//
|
|
//*****************************************************************************
|
|
unsigned long
|
|
SysCtlClockGet(void)
|
|
{
|
|
unsigned long ulRCC, ulRCC2, ulPLL, ulClk;
|
|
|
|
//
|
|
// Read RCC and RCC2. For Sandstorm-class devices (which do not have
|
|
// RCC2), the RCC2 read will return 0, which indicates that RCC2 is
|
|
// disabled (since the SYSCTL_RCC2_USERCC2 bit is clear).
|
|
//
|
|
ulRCC = HWREG(SYSCTL_RCC);
|
|
ulRCC2 = HWREG(SYSCTL_RCC2);
|
|
|
|
//
|
|
// Get the base clock rate.
|
|
//
|
|
switch((ulRCC2 & SYSCTL_RCC2_USERCC2) ?
|
|
(ulRCC2 & SYSCTL_RCC2_OSCSRC2_M) :
|
|
(ulRCC & SYSCTL_RCC_OSCSRC_M))
|
|
{
|
|
//
|
|
// The main oscillator is the clock source. Determine its rate from
|
|
// the crystal setting field.
|
|
//
|
|
case SYSCTL_RCC_OSCSRC_MAIN:
|
|
{
|
|
ulClk = g_pulXtals[(ulRCC & SYSCTL_RCC_XTAL_M) >>
|
|
SYSCTL_RCC_XTAL_S];
|
|
break;
|
|
}
|
|
|
|
//
|
|
// The internal oscillator is the source clock.
|
|
//
|
|
case SYSCTL_RCC_OSCSRC_INT:
|
|
{
|
|
//
|
|
// See if this is a Sandstorm-class or Fury-class device.
|
|
//
|
|
if(CLASS_IS_SANDSTORM)
|
|
{
|
|
//
|
|
// The internal oscillator on a Sandstorm-class device is
|
|
// 15 MHz +/- 50%.
|
|
//
|
|
ulClk = 15000000;
|
|
}
|
|
else if((CLASS_IS_FURY && REVISION_IS_A2) ||
|
|
(CLASS_IS_DUSTDEVIL && REVISION_IS_A0))
|
|
{
|
|
//
|
|
// The internal oscillator on a rev A2 Fury-class device and a
|
|
// rev A0 Dustdevil-class device is 12 MHz +/- 30%.
|
|
//
|
|
ulClk = 12000000;
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// The internal oscillator on all other devices is 16 MHz.
|
|
//
|
|
ulClk = 16000000;
|
|
}
|
|
break;
|
|
}
|
|
|
|
//
|
|
// The internal oscillator divided by four is the source clock.
|
|
//
|
|
case SYSCTL_RCC_OSCSRC_INT4:
|
|
{
|
|
//
|
|
// See if this is a Sandstorm-class or Fury-class device.
|
|
//
|
|
if(CLASS_IS_SANDSTORM)
|
|
{
|
|
//
|
|
// The internal oscillator on a Sandstorm-class device is
|
|
// 15 MHz +/- 50%.
|
|
//
|
|
ulClk = 15000000 / 4;
|
|
}
|
|
else if((CLASS_IS_FURY && REVISION_IS_A2) ||
|
|
(CLASS_IS_DUSTDEVIL && REVISION_IS_A0))
|
|
{
|
|
//
|
|
// The internal oscillator on a rev A2 Fury-class device and a
|
|
// rev A0 Dustdevil-class device is 12 MHz +/- 30%.
|
|
//
|
|
ulClk = 12000000 / 4;
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// The internal oscillator on a Tempest-class device is 16 MHz.
|
|
//
|
|
ulClk = 16000000 / 4;
|
|
}
|
|
break;
|
|
}
|
|
|
|
//
|
|
// The internal 30 KHz oscillator is the source clock.
|
|
//
|
|
case SYSCTL_RCC_OSCSRC_30:
|
|
{
|
|
//
|
|
// The internal 30 KHz oscillator has an accuracy of +/- 30%.
|
|
//
|
|
ulClk = 30000;
|
|
break;
|
|
}
|
|
|
|
//
|
|
// The 4.19 MHz clock from the hibernate module is the clock source.
|
|
//
|
|
case SYSCTL_RCC2_OSCSRC2_419:
|
|
{
|
|
ulClk = 4194304;
|
|
break;
|
|
}
|
|
|
|
//
|
|
// The 32 KHz clock from the hibernate module is the source clock.
|
|
//
|
|
case SYSCTL_RCC2_OSCSRC2_32:
|
|
{
|
|
ulClk = 32768;
|
|
break;
|
|
}
|
|
|
|
//
|
|
// An unknown setting, so return a zero clock (that is, an unknown
|
|
// clock rate).
|
|
//
|
|
default:
|
|
{
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
//
|
|
// See if the PLL is being used.
|
|
//
|
|
if(((ulRCC2 & SYSCTL_RCC2_USERCC2) && !(ulRCC2 & SYSCTL_RCC2_BYPASS2)) ||
|
|
(!(ulRCC2 & SYSCTL_RCC2_USERCC2) && !(ulRCC & SYSCTL_RCC_BYPASS)))
|
|
{
|
|
//
|
|
// Get the PLL configuration.
|
|
//
|
|
ulPLL = HWREG(SYSCTL_PLLCFG);
|
|
|
|
//
|
|
// See if this is a Sandstorm-class or Fury-class device.
|
|
//
|
|
if(CLASS_IS_SANDSTORM)
|
|
{
|
|
//
|
|
// Compute the PLL output frequency based on its input frequency.
|
|
// The formula for a Sandstorm-class devices is
|
|
// "(xtal * (f + 2)) / (r + 2)".
|
|
//
|
|
ulClk = ((ulClk * (((ulPLL & SYSCTL_PLLCFG_F_M) >>
|
|
SYSCTL_PLLCFG_F_S) + 2)) /
|
|
(((ulPLL & SYSCTL_PLLCFG_R_M) >>
|
|
SYSCTL_PLLCFG_R_S) + 2));
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// Compute the PLL output frequency based on its input frequency.
|
|
// The formula for a Fury-class device is
|
|
// "(xtal * f) / ((r + 1) * 2)".
|
|
//
|
|
ulClk = ((ulClk * ((ulPLL & SYSCTL_PLLCFG_F_M) >>
|
|
SYSCTL_PLLCFG_F_S)) /
|
|
((((ulPLL & SYSCTL_PLLCFG_R_M) >>
|
|
SYSCTL_PLLCFG_R_S) + 1) * 2));
|
|
}
|
|
|
|
//
|
|
// See if the optional output divide by 2 is being used.
|
|
//
|
|
if(ulPLL & SYSCTL_PLLCFG_OD_2)
|
|
{
|
|
ulClk /= 2;
|
|
}
|
|
|
|
//
|
|
// See if the optional output divide by 4 is being used.
|
|
//
|
|
if(ulPLL & SYSCTL_PLLCFG_OD_4)
|
|
{
|
|
ulClk /= 4;
|
|
}
|
|
|
|
//
|
|
// Force the system divider to be enabled. It is always used when
|
|
// using the PLL, but in some cases it will not read as being enabled.
|
|
//
|
|
ulRCC |= SYSCTL_RCC_USESYSDIV;
|
|
}
|
|
|
|
//
|
|
// See if the system divider is being used.
|
|
//
|
|
if(ulRCC & SYSCTL_RCC_USESYSDIV)
|
|
{
|
|
//
|
|
// Adjust the clock rate by the system clock divider.
|
|
//
|
|
if(ulRCC2 & SYSCTL_RCC2_USERCC2)
|
|
{
|
|
if((ulRCC2 & SYSCTL_RCC2_DIV400) &&
|
|
(((ulRCC2 & SYSCTL_RCC2_USERCC2) &&
|
|
!(ulRCC2 & SYSCTL_RCC2_BYPASS2)) ||
|
|
(!(ulRCC2 & SYSCTL_RCC2_USERCC2) &&
|
|
!(ulRCC & SYSCTL_RCC_BYPASS))))
|
|
|
|
{
|
|
ulClk = ((ulClk * 2) / (((ulRCC2 & (SYSCTL_RCC2_SYSDIV2_M |
|
|
SYSCTL_RCC2_SYSDIV2LSB)) >>
|
|
(SYSCTL_RCC2_SYSDIV2_S - 1)) + 1));
|
|
}
|
|
else
|
|
{
|
|
ulClk /= (((ulRCC2 & SYSCTL_RCC2_SYSDIV2_M) >>
|
|
SYSCTL_RCC2_SYSDIV2_S) + 1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
ulClk /= (((ulRCC & SYSCTL_RCC_SYSDIV_M) >> SYSCTL_RCC_SYSDIV_S) +
|
|
1);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Return the computed clock rate.
|
|
//
|
|
return(ulClk);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the PWM clock configuration.
|
|
//!
|
|
//! \param ulConfig is the configuration for the PWM clock; it must be one of
|
|
//! \b SYSCTL_PWMDIV_1, \b SYSCTL_PWMDIV_2, \b SYSCTL_PWMDIV_4,
|
|
//! \b SYSCTL_PWMDIV_8, \b SYSCTL_PWMDIV_16, \b SYSCTL_PWMDIV_32, or
|
|
//! \b SYSCTL_PWMDIV_64.
|
|
//!
|
|
//! This function sets the rate of the clock provided to the PWM module as a
|
|
//! ratio of the processor clock. This clock is used by the PWM module to
|
|
//! generate PWM signals; its rate forms the basis for all PWM signals.
|
|
//!
|
|
//! \note The clocking of the PWM is dependent upon the system clock rate as
|
|
//! configured by SysCtlClockSet().
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlPWMClockSet(unsigned long ulConfig)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT((ulConfig == SYSCTL_PWMDIV_1) ||
|
|
(ulConfig == SYSCTL_PWMDIV_2) ||
|
|
(ulConfig == SYSCTL_PWMDIV_4) ||
|
|
(ulConfig == SYSCTL_PWMDIV_8) ||
|
|
(ulConfig == SYSCTL_PWMDIV_16) ||
|
|
(ulConfig == SYSCTL_PWMDIV_32) ||
|
|
(ulConfig == SYSCTL_PWMDIV_64));
|
|
|
|
//
|
|
// Check that there is a PWM block on this part.
|
|
//
|
|
ASSERT(HWREG(SYSCTL_DC1) & SYSCTL_DC1_PWM);
|
|
|
|
//
|
|
// Set the PWM clock configuration into the run-mode clock configuration
|
|
// register.
|
|
//
|
|
HWREG(SYSCTL_RCC) = ((HWREG(SYSCTL_RCC) &
|
|
~(SYSCTL_RCC_USEPWMDIV | SYSCTL_RCC_PWMDIV_M)) |
|
|
ulConfig);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the current PWM clock configuration.
|
|
//!
|
|
//! This function returns the current PWM clock configuration.
|
|
//!
|
|
//! \return Returns the current PWM clock configuration; will be one of
|
|
//! \b SYSCTL_PWMDIV_1, \b SYSCTL_PWMDIV_2, \b SYSCTL_PWMDIV_4,
|
|
//! \b SYSCTL_PWMDIV_8, \b SYSCTL_PWMDIV_16, \b SYSCTL_PWMDIV_32, or
|
|
//! \b SYSCTL_PWMDIV_64.
|
|
//
|
|
//*****************************************************************************
|
|
unsigned long
|
|
SysCtlPWMClockGet(void)
|
|
{
|
|
//
|
|
// Check that there is a PWM block on this part.
|
|
//
|
|
ASSERT(HWREG(SYSCTL_DC1) & SYSCTL_DC1_PWM);
|
|
|
|
//
|
|
// Return the current PWM clock configuration. Make sure that
|
|
// SYSCTL_PWMDIV_1 is returned in all cases where the divider is disabled.
|
|
//
|
|
if(!(HWREG(SYSCTL_RCC) & SYSCTL_RCC_USEPWMDIV))
|
|
{
|
|
//
|
|
// The divider is not active so reflect this in the value we return.
|
|
//
|
|
return(SYSCTL_PWMDIV_1);
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// The divider is active so directly return the masked register value.
|
|
//
|
|
return(HWREG(SYSCTL_RCC) &
|
|
(SYSCTL_RCC_USEPWMDIV | SYSCTL_RCC_PWMDIV_M));
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the sample rate of the ADC.
|
|
//!
|
|
//! \param ulSpeed is the desired sample rate of the ADC; must be one of
|
|
//! \b SYSCTL_ADCSPEED_1MSPS, \b SYSCTL_ADCSPEED_500KSPS,
|
|
//! \b SYSCTL_ADCSPEED_250KSPS, or \b SYSCTL_ADCSPEED_125KSPS.
|
|
//!
|
|
//! This function sets the rate at which the ADC samples are captured by the
|
|
//! ADC block. The sampling speed may be limited by the hardware, so the
|
|
//! sample rate may end up being slower than requested. SysCtlADCSpeedGet()
|
|
//! will return the actual speed in use.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlADCSpeedSet(unsigned long ulSpeed)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT((ulSpeed == SYSCTL_ADCSPEED_1MSPS) ||
|
|
(ulSpeed == SYSCTL_ADCSPEED_500KSPS) ||
|
|
(ulSpeed == SYSCTL_ADCSPEED_250KSPS) ||
|
|
(ulSpeed == SYSCTL_ADCSPEED_125KSPS));
|
|
|
|
//
|
|
// Check that there is an ADC block on this part.
|
|
//
|
|
ASSERT(HWREG(SYSCTL_DC1) & SYSCTL_DC1_ADC0);
|
|
|
|
//
|
|
// Set the ADC speed in run, sleep, and deep-sleep mode.
|
|
//
|
|
HWREG(SYSCTL_RCGC0) = ((HWREG(SYSCTL_RCGC0) & ~(SYSCTL_RCGC0_ADCSPD_M)) |
|
|
ulSpeed);
|
|
HWREG(SYSCTL_SCGC0) = ((HWREG(SYSCTL_SCGC0) & ~(SYSCTL_SCGC0_ADCSPD_M)) |
|
|
ulSpeed);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the sample rate of the ADC.
|
|
//!
|
|
//! This function gets the current sample rate of the ADC.
|
|
//!
|
|
//! \return Returns the current ADC sample rate; will be one of
|
|
//! \b SYSCTL_ADCSPEED_1MSPS, \b SYSCTL_ADCSPEED_500KSPS,
|
|
//! \b SYSCTL_ADCSPEED_250KSPS, or \b SYSCTL_ADCSPEED_125KSPS.
|
|
//
|
|
//*****************************************************************************
|
|
unsigned long
|
|
SysCtlADCSpeedGet(void)
|
|
{
|
|
//
|
|
// Check that there is an ADC block on this part.
|
|
//
|
|
ASSERT(HWREG(SYSCTL_DC1) & SYSCTL_DC1_ADC0);
|
|
|
|
//
|
|
// Return the current ADC speed.
|
|
//
|
|
return(HWREG(SYSCTL_RCGC0) & SYSCTL_RCGC0_ADCSPD_M);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Configures the internal oscillator verification timer.
|
|
//!
|
|
//! \param bEnable is a boolean that is \b true if the internal oscillator
|
|
//! verification timer should be enabled.
|
|
//!
|
|
//! This function allows the internal oscillator verification timer to be
|
|
//! enabled or disabled. When enabled, an interrupt will be generated if the
|
|
//! internal oscillator ceases to operate.
|
|
//!
|
|
//! The internal oscillator verification timer is only available on
|
|
//! Sandstorm-class devices.
|
|
//!
|
|
//! \note Both oscillators (main and internal) must be enabled for this
|
|
//! verification timer to operate as the main oscillator will verify the
|
|
//! internal oscillator.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlIOSCVerificationSet(tBoolean bEnable)
|
|
{
|
|
//
|
|
// Enable or disable the internal oscillator verification timer as
|
|
// requested.
|
|
//
|
|
if(bEnable)
|
|
{
|
|
HWREG(SYSCTL_RCC) |= SYSCTL_RCC_IOSCVER;
|
|
}
|
|
else
|
|
{
|
|
HWREG(SYSCTL_RCC) &= ~(SYSCTL_RCC_IOSCVER);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Configures the main oscillator verification timer.
|
|
//!
|
|
//! \param bEnable is a boolean that is \b true if the main oscillator
|
|
//! verification timer should be enabled.
|
|
//!
|
|
//! This function allows the main oscillator verification timer to be enabled
|
|
//! or disabled. When enabled, an interrupt will be generated if the main
|
|
//! oscillator ceases to operate.
|
|
//!
|
|
//! The main oscillator verification timer is only available on
|
|
//! Sandstorm-class devices.
|
|
//!
|
|
//! \note Both oscillators (main and internal) must be enabled for this
|
|
//! verification timer to operate as the internal oscillator will verify the
|
|
//! main oscillator.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlMOSCVerificationSet(tBoolean bEnable)
|
|
{
|
|
//
|
|
// Enable or disable the main oscillator verification timer as requested.
|
|
//
|
|
if(bEnable)
|
|
{
|
|
HWREG(SYSCTL_RCC) |= SYSCTL_RCC_MOSCVER;
|
|
}
|
|
else
|
|
{
|
|
HWREG(SYSCTL_RCC) &= ~(SYSCTL_RCC_MOSCVER);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Configures the PLL verification timer.
|
|
//!
|
|
//! \param bEnable is a boolean that is \b true if the PLL verification timer
|
|
//! should be enabled.
|
|
//!
|
|
//! This function allows the PLL verification timer to be enabled or disabled.
|
|
//! When enabled, an interrupt will be generated if the PLL ceases to operate.
|
|
//!
|
|
//! The PLL verification timer is only available on Sandstorm-class devices.
|
|
//!
|
|
//! \note The main oscillator must be enabled for this verification timer to
|
|
//! operate as it is used to check the PLL. Also, the verification timer
|
|
//! should be disabled while the PLL is being reconfigured via
|
|
//! SysCtlClockSet().
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlPLLVerificationSet(tBoolean bEnable)
|
|
{
|
|
//
|
|
// Enable or disable the PLL verification timer as requested.
|
|
//
|
|
if(bEnable)
|
|
{
|
|
HWREG(SYSCTL_RCC) |= SYSCTL_RCC_PLLVER;
|
|
}
|
|
else
|
|
{
|
|
HWREG(SYSCTL_RCC) &= ~(SYSCTL_RCC_PLLVER);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Clears the clock verification status.
|
|
//!
|
|
//! This function clears the status of the clock verification timers, allowing
|
|
//! them to assert another failure if detected.
|
|
//!
|
|
//! The clock verification timers are only available on Sandstorm-class
|
|
//! devices.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlClkVerificationClear(void)
|
|
{
|
|
//
|
|
// Clear the clock verification.
|
|
//
|
|
HWREG(SYSCTL_CLKVCLR) = SYSCTL_CLKVCLR_VERCLR;
|
|
|
|
//
|
|
// The bit does not self-reset, so clear it.
|
|
//
|
|
HWREG(SYSCTL_CLKVCLR) = 0;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables a GPIO peripheral for access from the AHB.
|
|
//!
|
|
//! \param ulGPIOPeripheral is the GPIO peripheral to enable.
|
|
//!
|
|
//! This function is used to enable the specified GPIO peripheral to be
|
|
//! accessed from the Advanced Host Bus (AHB) instead of the legacy Advanced
|
|
//! Peripheral Bus (APB). When a GPIO peripheral is enabled for AHB access,
|
|
//! the \b _AHB_BASE form of the base address should be used for GPIO
|
|
//! functions. For example, instead of using \b GPIO_PORTA_BASE as the base
|
|
//! address for GPIO functions, use \b GPIO_PORTA_AHB_BASE instead.
|
|
//!
|
|
//! The \e ulGPIOPeripheral argument must be only one of the following values:
|
|
//! \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB, \b SYSCTL_PERIPH_GPIOC,
|
|
//! \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE, \b SYSCTL_PERIPH_GPIOF,
|
|
//! \b SYSCTL_PERIPH_GPIOG, or \b SYSCTL_PERIPH_GPIOH.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlGPIOAHBEnable(unsigned long ulGPIOPeripheral)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT((ulGPIOPeripheral == SYSCTL_PERIPH_GPIOA) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOB) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOC) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOD) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOE) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOF) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOG) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOH) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOJ));
|
|
|
|
//
|
|
// Enable this GPIO for AHB access.
|
|
//
|
|
HWREG(SYSCTL_GPIOHBCTL) |= ulGPIOPeripheral & 0xFFFF;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables a GPIO peripheral for access from the AHB.
|
|
//!
|
|
//! \param ulGPIOPeripheral is the GPIO peripheral to disable.
|
|
//!
|
|
//! This function disables the specified GPIO peripheral for access from the
|
|
//! Advanced Host Bus (AHB). Once disabled, the GPIO peripheral is accessed
|
|
//! from the legacy Advanced Peripheral Bus (AHB).
|
|
//!
|
|
//! The \b ulGPIOPeripheral argument must be only one of the following values:
|
|
//! \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB, \b SYSCTL_PERIPH_GPIOC,
|
|
//! \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE, \b SYSCTL_PERIPH_GPIOF,
|
|
//! \b SYSCTL_PERIPH_GPIOG, or \b SYSCTL_PERIPH_GPIOH.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlGPIOAHBDisable(unsigned long ulGPIOPeripheral)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT((ulGPIOPeripheral == SYSCTL_PERIPH_GPIOA) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOB) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOC) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOD) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOE) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOF) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOG) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOH) ||
|
|
(ulGPIOPeripheral == SYSCTL_PERIPH_GPIOJ));
|
|
|
|
//
|
|
// Disable this GPIO for AHB access.
|
|
//
|
|
HWREG(SYSCTL_GPIOHBCTL) &= ~(ulGPIOPeripheral & 0xFFFF);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Powers up the USB PLL.
|
|
//!
|
|
//! This function will enable the USB controller's PLL which is used by it's
|
|
//! physical layer. This call is necessary before connecting to any external
|
|
//! devices.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlUSBPLLEnable(void)
|
|
{
|
|
//
|
|
// Turn on the USB PLL.
|
|
//
|
|
HWREG(SYSCTL_RCC2) &= ~SYSCTL_RCC2_USBPWRDN;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Powers down the USB PLL.
|
|
//!
|
|
//! This function will disable the USB controller's PLL which is used by it's
|
|
//! physical layer. The USB registers are still accessible, but the physical
|
|
//! layer will no longer function.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
SysCtlUSBPLLDisable(void)
|
|
{
|
|
//
|
|
// Turn of USB PLL.
|
|
//
|
|
HWREG(SYSCTL_RCC2) |= SYSCTL_RCC2_USBPWRDN;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the MCLK frequency provided to the I2S module.
|
|
//!
|
|
//! \param ulInputClock is the input clock to the MCLK divider. If this is
|
|
//! zero, the value is computed from the current PLL configuration.
|
|
//! \param ulMClk is the desired MCLK frequency. If this is zero, MCLK output
|
|
//! is disabled.
|
|
//!
|
|
//! This function sets the dividers to provide MCLK to the I2S module. A MCLK
|
|
//! divider will be chosen that produces the MCLK frequency that is the closest
|
|
//! possible to the requested frequency, which may be above or below the
|
|
//! requested frequency.
|
|
//!
|
|
//! The actual MCLK frequency will be returned. It is the responsibility of
|
|
//! the application to determine if the selected MCLK is acceptable; in general
|
|
//! the human ear can not discern the frequency difference if it is within 0.3%
|
|
//! of the desired frequency (though there is a very small percentage of the
|
|
//! population that can discern lower frequency deviations).
|
|
//!
|
|
//! \return Returns the actual MCLK frequency.
|
|
//
|
|
//*****************************************************************************
|
|
unsigned long
|
|
SysCtlI2SMClkSet(unsigned long ulInputClock, unsigned long ulMClk)
|
|
{
|
|
unsigned long ulDivInt, ulDivFrac, ulPLL;
|
|
|
|
//
|
|
// See if the I2S MCLK should be disabled.
|
|
//
|
|
if(ulMClk == 0)
|
|
{
|
|
//
|
|
// Disable the I2S MCLK and return.
|
|
//
|
|
HWREG(SYSCTL_I2SMCLKCFG) = 0;
|
|
return(0);
|
|
}
|
|
|
|
//
|
|
// See if the input clock was specified.
|
|
//
|
|
if(ulInputClock == 0)
|
|
{
|
|
//
|
|
// The input clock was not specified, so compute the output frequency
|
|
// of the PLL. Get the current PLL configuration.
|
|
//
|
|
ulPLL = HWREG(SYSCTL_PLLCFG);
|
|
|
|
//
|
|
// Get the frequency of the crystal in use.
|
|
//
|
|
ulInputClock = g_pulXtals[(HWREG(SYSCTL_RCC) & SYSCTL_RCC_XTAL_M) >>
|
|
SYSCTL_RCC_XTAL_S];
|
|
|
|
//
|
|
// Calculate the PLL output frequency.
|
|
//
|
|
ulInputClock = ((ulInputClock * ((ulPLL & SYSCTL_PLLCFG_F_M) >>
|
|
SYSCTL_PLLCFG_F_S)) /
|
|
((((ulPLL & SYSCTL_PLLCFG_R_M) >>
|
|
SYSCTL_PLLCFG_R_S) + 1)));
|
|
|
|
//
|
|
// See if the optional output divide by 2 is being used.
|
|
//
|
|
if(ulPLL & SYSCTL_PLLCFG_OD_2)
|
|
{
|
|
ulInputClock /= 2;
|
|
}
|
|
|
|
//
|
|
// See if the optional output divide by 4 is being used.
|
|
//
|
|
if(ulPLL & SYSCTL_PLLCFG_OD_4)
|
|
{
|
|
ulInputClock /= 4;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Verify that the requested MCLK frequency is attainable.
|
|
//
|
|
ASSERT(ulMClk < ulInputClock);
|
|
|
|
//
|
|
// Add a rounding factor to the input clock, so that the MCLK frequency
|
|
// that is closest to the desire value is selected.
|
|
//
|
|
ulInputClock += (ulMClk / 32) - 1;
|
|
|
|
//
|
|
// Compute the integer portion of the MCLK divider.
|
|
//
|
|
ulDivInt = ulInputClock / ulMClk;
|
|
|
|
//
|
|
// If the divisor is too large, then simply use the maximum divisor.
|
|
//
|
|
if(CLASS_IS_TEMPEST && REVISION_IS_B1 && (ulDivInt > 255))
|
|
{
|
|
ulDivInt = 255;
|
|
ulDivFrac = 15;
|
|
}
|
|
else if(ulDivInt > 1023)
|
|
{
|
|
ulDivInt = 1023;
|
|
ulDivFrac = 15;
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// Compute the fractional portion of the MCLK divider.
|
|
//
|
|
ulDivFrac = ((ulInputClock - (ulDivInt * ulMClk)) * 16) / ulMClk;
|
|
}
|
|
|
|
//
|
|
// Set the divisor for the Tx and Rx MCLK generators and enable the clocks.
|
|
//
|
|
HWREG(SYSCTL_I2SMCLKCFG) = (SYSCTL_I2SMCLKCFG_RXEN |
|
|
(ulDivInt << SYSCTL_I2SMCLKCFG_RXI_S) |
|
|
(ulDivFrac << SYSCTL_I2SMCLKCFG_RXF_S) |
|
|
SYSCTL_I2SMCLKCFG_TXEN |
|
|
(ulDivInt << SYSCTL_I2SMCLKCFG_TXI_S) |
|
|
(ulDivFrac << SYSCTL_I2SMCLKCFG_TXF_S));
|
|
|
|
//
|
|
// Return the actual MCLK frequency.
|
|
//
|
|
ulInputClock -= (ulMClk / 32) - 1;
|
|
ulDivInt = (ulDivInt * 16) + ulDivFrac;
|
|
ulMClk = (ulInputClock / ulDivInt) * 16;
|
|
ulMClk += ((ulInputClock - ((ulMClk / 16) * ulDivInt)) * 16) / ulDivInt;
|
|
return(ulMClk);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// Close the Doxygen group.
|
|
//! @}
|
|
//
|
|
//*****************************************************************************
|