qmk-firmware/platforms/chibios/STM32_F103_STM32DUINO/board/board.c

/*
    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

#include <hal.h>

// Value to place in RTC backup register 10 for persistent bootloader mode
#define RTC_BOOTLOADER_FLAG 0x424C

/**
 * @brief   PAL setup.
 * @details Digital I/O ports static configuration as defined in @p board.h.
 *          This variable is used by the HAL when initializing the PAL driver.
 */
#if HAL_USE_PAL || defined(__DOXYGEN__)
const PALConfig pal_default_config =
{
  {VAL_GPIOAODR, VAL_GPIOACRL, VAL_GPIOACRH},
  {VAL_GPIOBODR, VAL_GPIOBCRL, VAL_GPIOBCRH},
  {VAL_GPIOCODR, VAL_GPIOCCRL, VAL_GPIOCCRH},
  {VAL_GPIODODR, VAL_GPIODCRL, VAL_GPIODCRH},
  {VAL_GPIOEODR, VAL_GPIOECRL, VAL_GPIOECRH},
};
#endif

__attribute__((weak)) void enter_bootloader_mode_if_requested(void) {}

/*
 * Early initialization code.
 * This initialization must be performed just after stack setup and before
 * any other initialization.
 */
void __early_init(void) {
  enter_bootloader_mode_if_requested();

  stm32_clock_init();
}

/*
 * Board-specific initialization code.
 */
void boardInit(void) {
   //JTAG-DP Disabled and SW-DP Enabled
   AFIO->MAPR |= AFIO_MAPR_SWJ_CFG_JTAGDISABLE;
   //Set backup register DR10 to enter bootloader on reset
   BKP->DR10 = RTC_BOOTLOADER_FLAG;
}