diff options
| -rw-r--r-- | main.c | 76 |
1 files changed, 48 insertions, 28 deletions
@@ -57,18 +57,16 @@ void rtc_write(volatile uint32_t *reg, uint32_t val) { while (!(RTC->CRL & RTC_CRL_RTOFF)) ; } -void rtc_bus_sync(void) { - RTC->CRL &= ~RTC_CRL_RSF; - while (!(RTC->CRL & RTC_CRL_RSF)) ; -} - void rtc_alarm_reset(void) { RTC->CRL &= ~RTC_CRL_ALRF; } void rtc_init(void) { - RTC->CRH = 0; + RTC->CRH = RTC_CRH_ALRIE; + + /* Cold boot config */ if (((RTC_INITIALIZED_REGISTER_HIGH<<16) | RTC_INITIALIZED_REGISTER_LOW) != COMPILE_TIME) { + /* RTC clock config */ RCC->BDCR = RCC_BDCR_RTCEN | (1<<RCC_BDCR_RTCSEL_Pos) | RCC_BDCR_LSEON; while (!(RCC->BDCR & RCC_BDCR_LSERDY)) ; @@ -78,7 +76,9 @@ void rtc_init(void) { RTC_INITIALIZED_REGISTER_LOW = COMPILE_TIME&0xffff; REBOOT_REGISTER = 0; } - rtc_bus_sync(); + + /* Synchronize RTC registers from backup domain */ + RTC->CRL &= ~RTC_CRL_RSF; } void rtc_set_alarm_sec(uint32_t value) { @@ -86,6 +86,8 @@ void rtc_set_alarm_sec(uint32_t value) { } uint32_t rtc_time(void) { + /* Wait for register synchronization after bootup */ + while (!(RTC->CRL & RTC_CRL_RSF)) ; return RTC->CNTH<<16 | RTC->CNTL; } @@ -96,27 +98,46 @@ void rtc_set_alarm_rel_sec(uint32_t value) { int main(void){ /* We're starting out from HSI@8MHz */ SystemCoreClockUpdate(); - SCB->SCR &= (~SCB_SCR_SLEEPONEXIT_Msk) & SCB_SCR_SLEEPDEEP_Msk; /* Disable for now */ + SCB->SCR &= (~SCB_SCR_SLEEPONEXIT_Msk) & (~SCB_SCR_SLEEPDEEP_Msk); /* Disable for now */ for (int i=0; i<50000; i++) asm volatile ("nop"); /* Turn on lots of neat things */ - RCC->APB2ENR |= RCC_APB2ENR_IOPCEN; + RCC->APB2ENR |= RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPBEN; RCC->APB1ENR |= RCC_APB1ENR_BKPEN | RCC_APB1ENR_PWREN; PWR->CR = PWR_CR_DBP; GPIOC->CRH |= - (0<<GPIO_CRH_CNF13_Pos) | (2<<GPIO_CRH_MODE13_Pos)| /* PC13 - LED */ - (0<<GPIO_CRH_CNF14_Pos) | (2<<GPIO_CRH_MODE14_Pos); /* PC14 - MOSFET */ - GPIOC->ODR |= 1<<13; - GPIOC->ODR &= ~(1<<14); + (0<<GPIO_CRH_CNF13_Pos) | (2<<GPIO_CRH_MODE13_Pos); /* PC13 - LED */ + GPIOB->CRH |= + (0<<GPIO_CRH_CNF8_Pos) | (2<<GPIO_CRH_MODE8_Pos); /* PB8 - MOSFET */ + GPIOC->ODR |= 1<<13; /* LED */ + GPIOB->ODR &= ~(1<<8); /* MOSFET */ rtc_init(); rtc_alarm_reset(); - rtc_set_alarm_rel_sec(0); + //NVIC_ClearPendingIRQ(RTC_IRQn); + NVIC_EnableIRQ(RTC_IRQn); + NVIC_SetPriority(RTC_IRQn, 1); + + rtc_set_alarm_rel_sec(1); + + //if (!(PWR->CSR & PWR_CSR_WUF)) /* This reset wasn't caused by the RTC alarm */ + REBOOT_REGISTER++; + + //SCB->SCR |= SCB_SCR_SEVONPEND_Msk; + //SCB->SCR &= (~SCB_SCR_SLEEPONEXIT_Msk) & (~SCB_SCR_SLEEPDEEP_Msk); + //PWR->CR &= (~PWR_CR_PDDS) & (~PWR_CR_LPDS); + //PWR->CR |= PWR_CR_CWUF; /* This has 2 cycles latency, thus the NOPs */ + //asm volatile ("nop"); + //asm volatile ("nop"); + while (42) + asm volatile ("wfi"); +} - if (!(PWR->CSR & PWR_CSR_WUF)) /* This reset wasn't caused by the RTC alarm */ - REBOOT_REGISTER++; +void RTC_IRQHandler(void) { + rtc_alarm_reset(); + rtc_set_alarm_rel_sec(1); uint32_t now = rtc_time(); bool switch_on = false; @@ -135,26 +156,25 @@ int main(void){ switch_on = (now >= TARGET_DATE - (DAY_SECONDS*24) && now < TARGET_DATE); } - if (switch_on && now/300 % 24 == 0) { - GPIOC->ODR |= 1<<14; + if (switch_on && (now/2) % 3 == 0) { + GPIOB->ODR |= 1<<8; /* Go to sleep mode to keep GPIO active */ - PWR->CR &= ~PWR_CR_PDDS; - SCB->SCR &= ~(SCB_SCR_SLEEPDEEP_Msk); /* Use deep sleep mode */ + //PWR->CR &= ~PWR_CR_PDDS; + //SCB->SCR &= ~(SCB_SCR_SLEEPDEEP_Msk); /* Use deep sleep mode */ } else { - GPIOC->ODR &= ~(1<<14); + GPIOB->ODR &= ~(1<<8); /* Go to standby mode to reduce power consumption */ - PWR->CR = PWR_CR_PDDS; - SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk; /* Use deep sleep mode */ + //PWR->CR = PWR_CR_PDDS; + //SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk; /* Use deep sleep mode */ } - PWR->CR |= PWR_CR_CWUF; /* This has 2 cycles latency, thus the NOPs */ - asm volatile ("nop"); - asm volatile ("nop"); - asm volatile ("wfe"); - return 42; + GPIOC->ODR &= ~(1<<13); + for (int i=0; i<5000; i++) + asm volatile ("nop"); + GPIOC->ODR |= 1<<13; } void gdb_dump(void) { |