161 lines
6.8 KiB
C
161 lines
6.8 KiB
C
/************************************************************************************//**
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* \file Source\ARMCM0_STM32\cpu.c
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* \brief Bootloader cpu module source file.
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* \ingroup Target_ARMCM0_STM32
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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) 2016 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 have received a copy of the GNU General Public License along with OpenBLT. It
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* should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy.
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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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#include "stm32f0xx.h" /* for STM32F0 registers and drivers */
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/****************************************************************************************
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* Macro definitions
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****************************************************************************************/
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/** \brief Pointer to the user program's reset vector. */
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#define CPU_USER_PROGRAM_STARTADDR_PTR ((blt_addr)(NvmGetUserProgBaseAddress() + 0x00000004))
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/** \brief Pointer to the user program's vector table. */
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#define CPU_USER_PROGRAM_VECTABLE_OFFSET ((blt_int32u)NvmGetUserProgBaseAddress())
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/** \brief Size in bytes of the user program's vector table */
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#define CPU_USER_PROGRAM_VECTABLE_SIZE (0xC0u)
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/** \brief Start address of the user program's RAM where its vector table will be copied
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* to.
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*/
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#define CPU_USER_PROGRAM_RAM_BASEADDR ((blt_addr)(0x20000000))
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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); /* implemented in C-startup */
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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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/* enable system configuration peripheral, which is needed to remap the RAM later on */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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/* copy user program vector's to RAM */
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CpuMemCopy(CPU_USER_PROGRAM_RAM_BASEADDR, CPU_USER_PROGRAM_VECTABLE_OFFSET,
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CPU_USER_PROGRAM_VECTABLE_SIZE);
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/* remap RAM so that it also appears at address 0x00000000. this way the user program's
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* vector table in RAM is used instead of the bootloader's vector table in flash.
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*/
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SYSCFG_MemoryRemapConfig(SYSCFG_MemoryRemap_SRAM);
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/* set the address where the bootloader needs to jump to. this is the address of
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* the 2nd entry in the user program's vector table. this address points to the
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* user program's reset handler.
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*/
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pProgResetHandler = (void(*)(void))(*((blt_addr *)CPU_USER_PROGRAM_STARTADDR_PTR));
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/* The Cortex-M0 core has interrupts enabled out of reset. the bootloader
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* explicitly disables these for security reasons in the C-startup.
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* Enable them here again, so it does not have to be done by the user
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* program.
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*/
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__enable_irq();
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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 */
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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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