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Implement bkp's rtc alarm configuration

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Since the alarm must be set each time it is to be used, a separated
function is a better fit
This commit is contained in:
Steins7 2024-08-04 20:04:09 +02:00
parent 7ab6622908
commit 24e412446d
2 changed files with 34 additions and 6 deletions
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25
drv/bkp.c
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@ -33,7 +33,7 @@ static BkpRtcCallback rtc_callback;
//--public functions------------------------------------------------------------
void bkp_configure_rtc(uint32_t period_ms, enum BkpRtcClockSrc clock_src,
enum BkpRtcIrq irq_mask, uint32_t alarm_tick, BkpRtcCallback callback)
enum BkpRtcIrq irq_mask, BkpRtcCallback callback)
{
rcc_enable(RCC_AHB_NONE, RCC_APB1_BKP, RCC_APB2_NONE);
@ -55,8 +55,6 @@ void bkp_configure_rtc(uint32_t period_ms, enum BkpRtcClockSrc clock_src,
//configure core registers
rtc_regs->PRLH.PRL = prescaler >> 16;
rtc_regs->PRLL.PRL = prescaler;
rtc_regs->ALRH.RTC_ALR = alarm_tick >> 16;
rtc_regs->ALRL.RTC_ALR = alarm_tick;
//apply irq config
rtc_regs->CRH.word |= irq_mask & 0x7;
@ -73,6 +71,27 @@ void bkp_configure_rtc(uint32_t period_ms, enum BkpRtcClockSrc clock_src,
}
}
void bkp_set_rtc_alam(uint32_t offset)
{
uint32_t alarm = bkp_read_rtc() + offset;
//wait for last operation to finish
while (rtc_regs->CRL.RTOFF != 1) {}
//enable core configuration
rtc_regs->CRL.CNF = 1;
//write alarm value
rtc_regs->ALRH.RTC_ALR = alarm >> 16;
rtc_regs->ALRL.RTC_ALR = alarm;
//disable/apply core configuration
rtc_regs->CRL.CNF = 0;
//wait for last operation to finish
while (rtc_regs->CRL.RTOFF != 1) {}
}
uint32_t bkp_read_rtc(void)
{
//wait for core registers to be synchronized, immediate most of the time

15
drv/bkp.h
View File

@ -63,14 +63,23 @@ typedef void (*BkpRtcCallback)(enum BkpRtcIrq src);
* Clocks must be enabled prior to calling this function
*
* Mulitple IRQs can be enabled and redirected to single callback. The alarm
* IRQ, triggered at the specified tick value can be rerouted to an exti line
* for wakeup from stanby, in wich case it doesn't need to be enabled here.
* IRQ, triggered at the tick value specified by bkp_set_rtc_alam() can be
* rerouted to an exti line for wakeup from stop and standby, in wich case it
* doesn't need to be enabled here.
*
* Ensure backup domain writes are enabled (see pwr_configure_bkp_write()) while
* calling this function
*/
void bkp_configure_rtc(uint32_t period_ms, enum BkpRtcClockSrc clock_src,
enum BkpRtcIrq irq_mask, uint32_t alarm_tick, BkpRtcCallback callback);
enum BkpRtcIrq irq_mask, BkpRtcCallback callback);
/**
* Configure the alarm to trigger after the specified time in ticks, which can
* be viewed as an offset to the current time value. This offset is only precise
* to the tick and thus if the tick changes right after this function is
* called, the observed offset will be close to 1 tick short
*/
void bkp_set_rtc_alam(uint32_t offset);
/**
* Returns the current counter value of the RTC