27 lines
651 B
C
27 lines
651 B
C
#include "boot_port.h"
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#include "stm32f4xx_hal.h"
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#define REQUEST_MAGIC 0x42555342UL
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static uint32_t reset_at;
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static bool reset_pending;
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static void backup_access(void)
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{
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__HAL_RCC_PWR_CLK_ENABLE();
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PWR->CR |= PWR_CR_DBP;
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__HAL_RCC_RTC_ENABLE();
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}
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bool f407_boot_requested(void)
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{
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bool requested;
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backup_access(); requested=RTC->BKP0R==REQUEST_MAGIC;
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RTC->BKP0R=0; return requested;
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}
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void f407_request_boot(uint32_t now)
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{
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backup_access(); RTC->BKP0R=REQUEST_MAGIC;
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reset_at=now+500; reset_pending=true;
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}
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void f407_reset_poll(uint32_t now)
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{
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if(reset_pending && (int32_t)(now-reset_at)>=0) NVIC_SystemReset();
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}
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