102 lines
4.2 KiB
C
102 lines
4.2 KiB
C
/************************************************************************************//**
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* \file Demo\ARMCM4_TM4C_DK_TM4C123G_IAR\Prog\led.c
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* \brief LED driver source file.
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* \ingroup Prog_ARMCM4_TM4C_DK_TM4C123G_IAR
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* \internal
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*----------------------------------------------------------------------------------------
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* C O P Y R I G H T
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*----------------------------------------------------------------------------------------
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* Copyright (c) 2014 by Feaser http://www.feaser.com All rights reserved
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*
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*----------------------------------------------------------------------------------------
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* L I C E N S E
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*----------------------------------------------------------------------------------------
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* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with OpenBLT.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* A special exception to the GPL is included to allow you to distribute a combined work
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* that includes OpenBLT without being obliged to provide the source code for any
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* proprietary components. The exception text is included at the bottom of the license
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* file <license.html>.
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*
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* \endinternal
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****************************************************************************************/
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/****************************************************************************************
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* Include files
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****************************************************************************************/
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#include "header.h" /* generic header */
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/****************************************************************************************
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* Macro definitions
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****************************************************************************************/
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/** \brief Toggle interval time in milliseconds. */
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#define LED_TOGGLE_MS (500)
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/************************************************************************************//**
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** \brief Initializes the LED. The board doesn't have a dedicted LED so an
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** indicator on the LCD is used instead.
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** \return none.
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**
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****************************************************************************************/
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void LedInit(void)
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{
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/* enable the peripherals used by the LED driver */
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SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
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/* configure the LED as digital output and turn off the LED */
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GPIOPinTypeGPIOOutput(GPIO_PORTG_BASE, GPIO_PIN_2);
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GPIOPinWrite(GPIO_PORTG_BASE, GPIO_PIN_2, 0);
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} /*** end of LedInit ***/
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/************************************************************************************//**
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** \brief Toggles the LED at a fixed time interval.
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** \return none.
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**
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****************************************************************************************/
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void LedToggle(void)
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{
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static unsigned char led_toggle_state = 0;
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static unsigned long timer_counter_last = 0;
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unsigned long timer_counter_now;
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/* check if toggle interval time passed */
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timer_counter_now = TimeGet();
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if ( (timer_counter_now - timer_counter_last) < LED_TOGGLE_MS)
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{
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/* not yet time to toggle */
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return;
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}
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/* determine toggle action */
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if (led_toggle_state == 0)
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{
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led_toggle_state = 1;
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/* turn the LED on */
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GPIOPinWrite(GPIO_PORTG_BASE, GPIO_PIN_2, GPIO_PIN_2);
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}
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else
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{
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led_toggle_state = 0;
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/* turn the LED off */
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GPIOPinWrite(GPIO_PORTG_BASE, GPIO_PIN_2, 0);
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}
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/* store toggle time to determine next toggle interval */
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timer_counter_last = timer_counter_now;
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} /*** end of LedToggle ***/
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/*********************************** end of led.c **************************************/
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