deepsleep: use libopencm3 functions instead of register access

src/deepsleep.c

@@ -6,6 +6,7 @@
 
 #include "clock.h"
 #include "deepsleep.h"
+#include "libopencm3/stm32/f0/rcc.h"
 
 void init_rtc(void)
 {
@@ -30,7 +31,7 @@ void init_rtc(void)
 	/* ?! Stdperiph examples don't turn this on until _afterwards_ which
 	 * simply doesn't work.  It must be on at least to be able to
 	 * configure it */
-	RCC_BDCR |= RCC_BDCR_RTCEN;
+	rcc_enable_rtc_clock();
 
 	pwr_enable_backup_domain_write_protect();
 
@@ -43,13 +44,12 @@ void init_rtc(void)
 static void unlock_rtc_access(void)
 {
 	pwr_disable_backup_domain_write_protect();
-	RTC_WPR = 0xCA;
+	rtc_unlock();
-	RTC_WPR = 0x53;
 }
 
 static void lock_rtc_access(void)
 {
-	RTC_WPR = 0xFF;
+	rtc_lock();
 	pwr_enable_backup_domain_write_protect();
 }
 
@@ -61,12 +61,8 @@ void deepsleep(uint32_t duration_secs)
 	unlock_rtc_access();
 
 	// enter initialization mode
-	RTC_ISR |= RTC_ISR_INIT;
+	rtc_set_init_flag();
-
+	rtc_wait_for_init_ready();
-	// wait until initialization mode has been entered
-	while((RTC_ISR & RTC_ISR_INITF) != RTC_ISR_INITF) {
-		// do nothing
-	}
 
 	RTC_TR = 0; // 00:00:00
 	RTC_DR = // friday, 01.01.16
@@ -116,20 +112,20 @@ void deepsleep(uint32_t duration_secs)
 	RTC_CR |= RTC_CR_ALRAE | RTC_CR_ALRAIE;
 
 	// leave initialization mode
-	RTC_ISR &= ~RTC_ISR_INIT;
+	rtc_clear_init_flag();
 
 	// lock registers again (using invalid key)
 	lock_rtc_access();
 
 	// enter deep sleep mode
 	SCB_SCR |= SCB_SCR_SLEEPDEEP;
-	PWR_CR |= PWR_CR_LPDS; // voltage regulator low-power mode
+	pwr_voltage_regulator_low_power_in_stop();
 	pwr_set_stop_mode();
 	__WFI();
 	SCB_SCR &= ~SCB_SCR_SLEEPDEEP; // no deepsleep except in this function
 
-	rcc_periph_clock_disable(RCC_PWR); // no longer needed
+	//rcc_periph_clock_disable(RCC_PWR); // no longer needed
-	rcc_osc_off(RCC_LSI);
+	//rcc_osc_off(RCC_LSI);
 	init_clock(); // ensure that all clocks are running again
 }
 

src/main.c

@@ -223,8 +223,9 @@ int main(void)
 				} else {
 					// charge control already idle
 					if((timebase_ms - charge_control_idle_since) > DEEPSLEEP_DELAY) {
-						rs485_enqueue("PWR:DEEPSLEEP");
+						rs485_enqueue("PWR:DEEPSLEEP:ENTRY\n");
 						deepsleep(DEEPSLEEP_DURATION);
+						rs485_enqueue("PWR:DEEPSLEEP:EXIT\n");
 						charge_control_was_idle = false;
 					}
 				}