I am trying to go in standby and wake up after few seconds repeatedly with using RTC wake-up timer but I am having problem after second sleep. It goes sleep, wakes up and then goes sleep again like I expected but after that point(after second sleep) it never wakes up again. I am too having sleep disorder sometimes but I think it is problem for health forums. Anyway my code is like that:
int main(void)
{
HAL_Init();
SystemClock_Config();
uart_init();
led_init();
adc_init();
while(HAL_ADC_Start_IT(&pADC1)!=HAL_OK) {HAL_GPIO_TogglePin(GPIOD,GPIO_PIN_15); HAL_Delay(100);}
HAL_GPIO_TogglePin(GPIOD,GPIO_PIN_15);
HAL_Delay(1000);
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
enter_standby_mode();
while (1)
{
}
}
void enter_standby_mode(void)
{
RCC->APB1ENR |= RCC_APB1ENR_PWREN; //enable PWR
RCC->APB1RSTR |= RCC_APB1RSTR_PWRRST;
RCC->APB1RSTR &= ~RCC_APB1RSTR_PWRRST;
PWR->CR |= PWR_CR_DBP; //Disable backup domain write protection
RCC->CSR |= RCC_CSR_LSION; //LSI on
while(!(RCC->CSR & RCC_CSR_LSIRDY)); //wait for LSIRDY
RCC->BDCR |= RCC_BDCR_RTCSEL_1; //LSI clock source
RCC->BDCR |= RCC_BDCR_RTCEN; //enable
RTC->WPR = 0xCA; //key
RTC->WPR = 0x53; //key
RTC->CR &=~ RTC_CR_WUTE; //disable WakeUp Timer
while(!(RTC->ISR & RTC_ISR_WUTWF)); //wait for WUTWF
RTC->WUTR = 0x02EE0;
RTC->CR |= RTC_CR_WUCKSEL_0; //RTCCLK/8
RTC->CR |= RTC_CR_WUTIE; //enable interrupt
RTC->CR |= RTC_CR_WUTE; //enable WakeUp Timer
RTC->WPR = 0xFF; //key
HAL_GPIO_TogglePin(GPIOD,GPIO_PIN_13);
HAL_Delay(100);
HAL_PWR_EnterSTANDBYMode();
}
