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stm32_rtc_endwr(): wait for RTC_CRL_RTOFF bit to be set. This ensures that the write "reaches" RTC registers before access is disabled by stm32_pwr_enablebkp().

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This commit is contained in:
Freddie Chopin
2016-01-28 16:58:02 -06:00
committed by Gregory Nutt
parent 5d0c914121
commit 8203659ee5
1 changed files with 7 additions and 0 deletions
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arch/arm/src/stm32/stm32_rtcounter.c
+7
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@@ -229,6 +229,13 @@ static inline void stm32_rtc_beginwr(void)
static inline void stm32_rtc_endwr(void)
{
modifyreg16(STM32_RTC_CRL, RTC_CRL_CNF, 0);
/* Wait for the write to actually reach RTC registers */
while ((getreg16(STM32_RTC_CRL) & RTC_CRL_RTOFF) == 0)
{
up_waste();
}
}
/************************************************************************************