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https://github.com/RIOT-OS/RIOT.git
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78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
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/*
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* Copyright (C) 2020 Benjamin Valentin
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_stm32
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* @{
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*
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* @file
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* @brief Trigger reset to the bootloader stored in the internal boot ROM
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* memory.
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*
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* This will start the DFU/UART/SPI bootloader.
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* See application note AN2606 for which options are available on
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* your individual MCU.
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*
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* @author Benjamin Valentin <benpicco@googlemail.com>
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* @author Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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*
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* @}
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*/
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#include "cpu.h"
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#include "periph_cpu.h"
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#include "sched.h"
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/* repurpose the sched_context_switch_request variable to signal
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* jump to bootloader after reset */
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#define MAGIC sched_context_switch_request
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#define BOOTLOADER_MAGIC 0xB007AFFE
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/* called by reset_handler_default() before memory is initialized */
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void pre_startup(void)
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{
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if (MAGIC != BOOTLOADER_MAGIC) {
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return;
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}
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/* clear magic */
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MAGIC = 0;
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/* enable SYSCFG clock */
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#if defined(RCC_APB2ENR_SYSCFGEN)
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RCC->APB2ENR = RCC_APB2ENR_SYSCFGEN;
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#elif defined(RCC_APB2ENR_SYSCFGCOMPEN)
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RCC->APB2ENR = RCC_APB2ENR_SYSCFGCOMPEN
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#endif
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/* remap ROM at zero */
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#if defined(SYSCFG_MEMRMP_MEM_MODE_0)
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SYSCFG->MEMRMP = SYSCFG_MEMRMP_MEM_MODE_0;
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#elif defined(SYSCFG_CFGR1_MEM_MODE_0)
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SYSCFG->CFGR1 = SYSCFG_CFGR1_MEM_MODE_0;
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#endif
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/* jump to the bootloader */
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__asm__ volatile(
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"ldr r0, [%[btldr]] \n"
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"mov sp, r0 \n"
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"ldr r0, [%[btldr], #4] \n"
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"mov pc, r0 \n"
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: /* no outputs */
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: [btldr] "r" ((uintptr_t)STM32_BOOTLOADER_ADDR)
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: "r0", "memory"
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);
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}
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void __attribute__((weak)) usb_board_reset_in_bootloader(void)
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{
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irq_disable();
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MAGIC = BOOTLOADER_MAGIC;
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NVIC_SystemReset();
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}
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