You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
1.8 KiB
70 lines
1.8 KiB
2 years ago
|
void enable_bdomain_protection(void) {
|
||
|
|
register_clear_bits(&(PWR->CR), PWR_CR_DBP);
|
||
|
|
}
|
||
|
|
|
||
|
|
void disable_bdomain_protection(void) {
|
||
|
|
register_set_bits(&(PWR->CR), PWR_CR_DBP);
|
||
|
|
}
|
||
|
|
|
||
|
|
void rtc_init(void){
|
||
|
|
uint32_t bdcr_opts = RCC_BDCR_RTCEN;
|
||
|
|
uint32_t bdcr_mask = (RCC_BDCR_RTCEN | RCC_BDCR_RTCSEL);
|
||
|
|
if (current_board->has_rtc_battery) {
|
||
|
|
bdcr_opts |= (RCC_BDCR_RTCSEL_0 | RCC_BDCR_LSEON);
|
||
|
|
bdcr_mask |= (RCC_BDCR_LSEMOD | RCC_BDCR_LSEBYP | RCC_BDCR_LSEON);
|
||
|
|
} else {
|
||
|
|
bdcr_opts |= RCC_BDCR_RTCSEL_1;
|
||
|
|
RCC->CSR |= RCC_CSR_LSION;
|
||
|
|
while((RCC->CSR & RCC_CSR_LSIRDY) == 0){}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Initialize RTC module and clock if not done already.
|
||
|
|
if((RCC->BDCR & bdcr_mask) != bdcr_opts){
|
||
|
|
print("Initializing RTC\n");
|
||
|
|
// Reset backup domain
|
||
|
|
register_set_bits(&(RCC->BDCR), RCC_BDCR_BDRST);
|
||
|
|
|
||
|
|
// Disable write protection
|
||
|
|
disable_bdomain_protection();
|
||
|
|
|
||
|
|
// Clear backup domain reset
|
||
|
|
register_clear_bits(&(RCC->BDCR), RCC_BDCR_BDRST);
|
||
|
|
|
||
|
|
// Set RTC options
|
||
|
|
register_set(&(RCC->BDCR), bdcr_opts, bdcr_mask);
|
||
|
|
|
||
|
|
// Enable write protection
|
||
|
|
enable_bdomain_protection();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void rtc_wakeup_init(void) {
|
||
|
|
EXTI->IMR |= EXTI_IMR_MR22;
|
||
|
|
EXTI->RTSR |= EXTI_RTSR_TR22; // rising edge
|
||
|
|
EXTI->FTSR &= ~EXTI_FTSR_TR22; // falling edge
|
||
|
|
|
||
|
|
NVIC_DisableIRQ(RTC_WKUP_IRQn);
|
||
|
|
|
||
|
|
// Disable write protection
|
||
|
|
disable_bdomain_protection();
|
||
|
|
RTC->WPR = 0xCA;
|
||
|
|
RTC->WPR = 0x53;
|
||
|
|
|
||
|
|
RTC->CR &= ~RTC_CR_WUTE;
|
||
|
|
while((RTC->ISR & RTC_ISR_WUTWF) == 0){}
|
||
|
|
|
||
|
|
RTC->CR &= ~RTC_CR_WUTIE;
|
||
|
|
RTC->ISR &= ~RTC_ISR_WUTF;
|
||
|
|
//PWR->CR |= PWR_CR_CWUF;
|
||
|
|
|
||
|
|
RTC->WUTR = DEEPSLEEP_WAKEUP_DELAY;
|
||
|
|
// Wakeup timer interrupt enable, wakeup timer enable, select 1Hz rate
|
||
|
|
RTC->CR |= RTC_CR_WUTE | RTC_CR_WUTIE | RTC_CR_WUCKSEL_2;
|
||
|
|
|
||
|
|
// Re-enable write protection
|
||
|
|
RTC->WPR = 0x00;
|
||
|
|
enable_bdomain_protection();
|
||
|
|
|
||
|
|
NVIC_EnableIRQ(RTC_WKUP_IRQn);
|
||
|
|
}
|