flipperzero-firmware/firmware/targets/f4/api-hal/api-hal-boot.c

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#include <api-hal-boot.h>
#include <stm32wbxx_ll_rtc.h>
#define BOOT_REQUEST_NONE 0x00000000
#define BOOT_REQUEST_DFU 0xDF00B000
void api_hal_boot_set_mode(ApiHalBootMode mode) {
if (mode == ApiHalBootModeNormal) {
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_NONE);
} else if (mode == ApiHalBootModeDFU) {
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_DFU);
}
}