160 lines
6.5 KiB
C
160 lines
6.5 KiB
C
/************************************************************************************//**
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* \file Source\ARM7_LPC2000\cpu.c
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* \brief Bootloader cpu module source file.
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* \ingroup Target_ARM7_LPC2000
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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) 2011 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 "boot.h" /* bootloader generic header */
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/****************************************************************************************
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* Macro definitions
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****************************************************************************************/
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/** \brief Start address of the user program vector table. */
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#define CPU_USER_PROG_VECTORS_START_ADDR ((blt_addr)NvmGetUserProgBaseAddress())
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/** \brief Start address of the RAM vector table. */
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#define CPU_RAM_VECTORS_START_ADDR ((blt_addr)0x40000000)
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/** \brief Size of the vector table in bytes. */
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#define CPU_VECTORS_TABLE_SIZE (64)
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/****************************************************************************************
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* Register definitions
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****************************************************************************************/
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/** \brief MEMMAP microcontroller register. */
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#define MEMMAP (*((volatile blt_int32u *) 0xE01FC040))
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/****************************************************************************************
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* Hook functions
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****************************************************************************************/
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#if (BOOT_CPU_USER_PROGRAM_START_HOOK > 0)
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extern blt_bool CpuUserProgramStartHook(void);
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#endif
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/****************************************************************************************
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* External functions
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****************************************************************************************/
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extern void Reset_Handler(void); /* reset service routine in cstart.s */
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/************************************************************************************//**
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** \brief Starts the user program, if one is present. In this case this function
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** does not return.
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** \return none.
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**
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****************************************************************************************/
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void CpuStartUserProgram(void)
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{
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void (*pProgResetHandler)(void);
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/* check if a user program is present by verifying the checksum */
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if (NvmVerifyChecksum() == BLT_FALSE)
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{
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/* not a valid user program so it cannot be started */
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return;
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}
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#if (BOOT_CPU_USER_PROGRAM_START_HOOK > 0)
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/* invoke callback */
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if (CpuUserProgramStartHook() == BLT_FALSE)
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{
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/* callback requests the user program to not be started */
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return;
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}
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#endif
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#if (BOOT_COM_ENABLE > 0)
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/* release the communication interface */
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ComFree();
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#endif
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/* reset the timer */
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TimerReset();
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/* copy the user program's interrupt vector table to RAM */
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CpuMemCopy(CPU_RAM_VECTORS_START_ADDR, CPU_USER_PROG_VECTORS_START_ADDR, \
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CPU_VECTORS_TABLE_SIZE);
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/* select RAM vector table */
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MEMMAP = 0x02;
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/* set the address where the bootloader needs to jump to */
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pProgResetHandler = (void *)CPU_RAM_VECTORS_START_ADDR;
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/* start the user program by activating its reset interrupt service routine */
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pProgResetHandler();
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} /*** end of CpuStartUserProgram ***/
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/************************************************************************************//**
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** \brief Copies data from the source to the destination address.
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** \param dest Destination address for the data.
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** \param src Source address of the data.
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** \param len length of the data in bytes.
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** \return none.
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**
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****************************************************************************************/
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void CpuMemCopy(blt_addr dest, blt_addr src, blt_int16u len)
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{
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blt_int8u *from, *to;
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/* set casted pointers */
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from = (blt_int8u *)src;
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to = (blt_int8u *)dest;
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/* copy all bytes from source address to destination address */
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while (len-- > 0)
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{
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/* store byte value from source to destination */
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*to++ = *from++;
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/* keep the watchdog happy */
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CopService();
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}
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} /*** end of CpuMemCopy ***/
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/************************************************************************************//**
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** \brief Perform a soft reset of the microcontroller by starting from the reset ISR.
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** \return none.
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**
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****************************************************************************************/
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void CpuReset(void)
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{
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/* perform a software reset by calling the reset ISR routine. note that this requires
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* access to the processor status registers (PSRs), which works because the entire
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* bootloader runs in supervisor mode.
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*/
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Reset_Handler();
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} /*** end of CpuReset ***/
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/*********************************** end of cpu.c **************************************/
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