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Wait for writes to finish upon exiting RTC config

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This fixes race condition when rtc_get_counter_val() call immediately follows
rtc_set_counter_val().
This commit is contained in:
Tomaz Solc 2012-03-16 10:14:00 +01:00 committed by Piotr Esden-Tempski
parent 0d50b97ed5
commit 5510e1fe3b
1 changed files with 2 additions and 3 deletions
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5
lib/stm32/f1/rtc.c
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@ -99,14 +99,13 @@ void rtc_enter_config_mode(void)
void rtc_exit_config_mode(void) void rtc_exit_config_mode(void)
{ {
/* u32 reg32; */ u32 reg32;
/* Exit configuration mode. */ /* Exit configuration mode. */
RTC_CRL &= ~RTC_CRL_CNF; RTC_CRL &= ~RTC_CRL_CNF;
/* Wait until the RTOFF bit is 1 (our RTC register write finished). */ /* Wait until the RTOFF bit is 1 (our RTC register write finished). */
/* while ((reg32 = (RTC_CRL & RTC_CRL_RTOFF)) == 0); */ while ((reg32 = (RTC_CRL & RTC_CRL_RTOFF)) == 0);
/* TODO: Unnecessary since we poll the bit on config entry(?) */
} }
void rtc_set_alarm_time(u32 alarm_time) void rtc_set_alarm_time(u32 alarm_time)