qmk_firmware

QMK firmware for my keyboards (Corne, Sweep Ferris) and trackball (Ploopy Adept)
Log | Files | Refs | Submodules | LICENSE

at32_dfu.c (2384B)

      1 // Copyright 2021-2023 QMK
      2 // Copyright 2023-2024 HorrorTroll <https://github.com/HorrorTroll>
      3 // Copyright 2023-2024 Zhaqian <https://github.com/zhaqian12>
      4 // SPDX-License-Identifier: GPL-2.0-or-later
      5 
      6 #include "bootloader.h"
      7 #include "util.h"
      8 
      9 #include <ch.h>
     10 #include <hal.h>
     11 #include "wait.h"
     12 
     13 #ifndef AT32_BOOTLOADER_RAM_SYMBOL
     14 #    define AT32_BOOTLOADER_RAM_SYMBOL __ram0_end__
     15 #endif
     16 
     17 extern uint32_t AT32_BOOTLOADER_RAM_SYMBOL;
     18 
     19 /* This code should be checked whether it runs correctly on platforms */
     20 #define SYMVAL(sym) (uint32_t)(((uint8_t *)&(sym)) - ((uint8_t *)0))
     21 #define BOOTLOADER_MAGIC 0xDEADBEEF
     22 #define MAGIC_ADDR (unsigned long *)(SYMVAL(AT32_BOOTLOADER_RAM_SYMBOL) - 4)
     23 
     24 __attribute__((weak)) void bootloader_marker_enable(void) {
     25     uint32_t *marker = (uint32_t *)MAGIC_ADDR;
     26     *marker          = BOOTLOADER_MAGIC; // set magic flag => reset handler will jump into boot loader
     27 }
     28 
     29 __attribute__((weak)) bool bootloader_marker_active(void) {
     30     const uint32_t *marker = (const uint32_t *)MAGIC_ADDR;
     31     return (*marker == BOOTLOADER_MAGIC) ? true : false;
     32 }
     33 
     34 __attribute__((weak)) void bootloader_marker_disable(void) {
     35     uint32_t *marker = (uint32_t *)MAGIC_ADDR;
     36     *marker          = 0;
     37 }
     38 
     39 __attribute__((weak)) void bootloader_jump(void) {
     40     bootloader_marker_enable();
     41     NVIC_SystemReset();
     42 }
     43 
     44 __attribute__((weak)) void mcu_reset(void) {
     45     NVIC_SystemReset();
     46 }
     47 
     48 void enter_bootloader_mode_if_requested(void) {
     49     if (bootloader_marker_active()) {
     50         bootloader_marker_disable();
     51 
     52         struct system_memory_vector_t {
     53             uint32_t stack_top;
     54             void (*entrypoint)(void);
     55         };
     56         const struct system_memory_vector_t *bootloader = (const struct system_memory_vector_t *)(AT32_BOOTLOADER_ADDRESS);
     57 
     58         __disable_irq();
     59 
     60 #if defined(__MPU_PRESENT) && (__MPU_PRESENT == 1U)
     61         ARM_MPU_Disable();
     62 #endif
     63 
     64         SysTick->CTRL = 0;
     65         SysTick->VAL  = 0;
     66         SysTick->LOAD = 0;
     67 
     68         // Clear interrupt enable and interrupt pending registers
     69         for (int i = 0; i < ARRAY_SIZE(NVIC->ICER); i++) {
     70             NVIC->ICER[i] = 0xFFFFFFFF;
     71             NVIC->ICPR[i] = 0xFFFFFFFF;
     72         }
     73 
     74         __set_CONTROL(0);
     75         __set_MSP(bootloader->stack_top);
     76         __enable_irq();
     77 
     78         // Jump to bootloader
     79         bootloader->entrypoint();
     80         while (true) {
     81         }
     82     }
     83 }