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ht32_dfu.c
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ht32_dfu.c
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/* Copyright 2021-2023 QMK
* Copyright 2024 Hansem Ro <hansemro@outlook.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "bootloader.h"
#include <ch.h>
#include <hal.h>
#include <util.h>
extern uint32_t __ram0_end__;
/* This code should be checked whether it runs correctly on platforms */
#define SYMVAL(sym) (uint32_t)(((uint8_t *)&(sym)) - ((uint8_t *)0))
#define BOOTLOADER_MAGIC 0xDEADBEEF
#define MAGIC_ADDR (unsigned long *)(SYMVAL(__ram0_end__) - 4)
__attribute__((weak)) void bootloader_marker_enable(void) {
uint32_t *marker = (uint32_t *)MAGIC_ADDR;
*marker = BOOTLOADER_MAGIC; // set magic flag => reset handler will jump into boot loader
}
__attribute__((weak)) bool bootloader_marker_active(void) {
const uint32_t *marker = (const uint32_t *)MAGIC_ADDR;
return (*marker == BOOTLOADER_MAGIC);
}
__attribute__((weak)) void bootloader_marker_disable(void) {
uint32_t *marker = (uint32_t *)MAGIC_ADDR;
*marker = 0;
}
__attribute__((weak)) void bootloader_jump(void) {
bootloader_marker_enable();
NVIC_SystemReset();
}
__attribute__((weak)) void mcu_reset(void) {
NVIC_SystemReset();
}
void enter_bootloader_mode_if_requested(void) {
if (bootloader_marker_active()) {
bootloader_marker_disable();
struct system_memory_vector_t {
uint32_t stack_top;
void (*entrypoint)(void);
};
const struct system_memory_vector_t *bootloader = (const struct system_memory_vector_t *)(HT32_BOOTLOADER_ADDRESS);
__disable_irq();
SysTick->CTRL = 0;
SysTick->VAL = 0;
SysTick->LOAD = 0;
#if defined(HT32F1653) || defined(HT32F1654)
// Set SBVT[n] to prevent ISP from jumping back to main flash
FMC->SBVT[0] = 0x1f000000;
FMC->SBVT[1] = 0x1f000004;
FMC->SBVT[2] = 0x1f000008;
FMC->SBVT[3] = 0x1f00000c;
#else // defined(HT32F52342) || defined(HT32F52352)
// Set MCUDBGCR to prevent ISP from jumping back to main flash
CKCU->MCUDBGCR |= CKCU_MCUDBGCR_DBWDT;
#endif
// Clear interrupt enable and interrupt pending registers
for (int i = 0; i < ARRAY_SIZE(NVIC->ICER); i++) {
NVIC->ICER[i] = 0xFFFFFFFF;
NVIC->ICPR[i] = 0xFFFFFFFF;
}
__set_CONTROL(0);
__set_MSP(bootloader->stack_top);
__enable_irq();
// Jump to bootloader
bootloader->entrypoint();
while (true) {
}
}
}