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drivers: rtc: stm32: avoid infinite blocking loop

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Use the less CPU intensive and timeout capable WAIT_FOR zephyr provided
macro

Signed-off-by: Johan Lafon <johan.lafon@syslinbit.com>
This commit is contained in:
Johan Lafon 2023-09-11 17:23:56 +02:00 • committed by Fabio Baltieri
commit a4f5f87e29
1 changed files with 29 additions and 6 deletions
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35
drivers/rtc/rtc_ll_stm32.c
View file

@ -57,6 +57,9 @@ LOG_MODULE_REGISTER(rtc_stm32, CONFIG_RTC_LOG_LEVEL);
#define MAX_PPB NB_PULSES_TO_PPB(MAX_CALP)
#define MIN_PPB -NB_PULSES_TO_PPB(MAX_CALM)
/* Timeout in microseconds used to wait for flags */
#define RTC_TIMEOUT 1000000
struct rtc_stm32_config {
LL_RTC_InitTypeDef ll_rtc_config;
const struct stm32_pclken *pclken;
@ -66,6 +69,24 @@ struct rtc_stm32_data {
/* Currently empty */
};
static int rtc_stm32_enter_initialization_mode(void)
{
LL_RTC_EnableInitMode(RTC);
bool success = WAIT_FOR(LL_RTC_IsActiveFlag_INIT(RTC), RTC_TIMEOUT, k_msleep(1));
if (!success) {
return -EIO;
}
return 0;
}
static inline void rtc_stm32_leave_initialization_mode(void)
{
LL_RTC_DisableInitMode(RTC);
}
static int rtc_stm32_configure(const struct device *dev)
{
const struct rtc_stm32_config *cfg = dev->config;
@ -158,6 +179,8 @@ static int rtc_stm32_set_time(const struct device *dev, const struct rtc_time *t
{
uint32_t real_year = timeptr->tm_year + TM_YEAR_REF;
int err = 0;
if (real_year < RTC_YEAR_REF) {
/* RTC does not support years before 2000 */
return -EINVAL;
@ -171,10 +194,10 @@ static int rtc_stm32_set_time(const struct device *dev, const struct rtc_time *t
LOG_INF("Setting clock");
LL_RTC_DisableWriteProtection(RTC);
LL_RTC_EnableInitMode(RTC);
while (!LL_RTC_IsActiveFlag_INIT(RTC)) {
};
err = rtc_stm32_enter_initialization_mode();
if (err) {
return err;
}
LL_RTC_DATE_SetYear(RTC, __LL_RTC_CONVERT_BIN2BCD(real_year - RTC_YEAR_REF));
LL_RTC_DATE_SetMonth(RTC, __LL_RTC_CONVERT_BIN2BCD(timeptr->tm_mon + 1));
@ -193,11 +216,11 @@ static int rtc_stm32_set_time(const struct device *dev, const struct rtc_time *t
LL_RTC_TIME_SetMinute(RTC, __LL_RTC_CONVERT_BIN2BCD(timeptr->tm_min));
LL_RTC_TIME_SetSecond(RTC, __LL_RTC_CONVERT_BIN2BCD(timeptr->tm_sec));
LL_RTC_DisableInitMode(RTC);
rtc_stm32_leave_initialization_mode();
LL_RTC_EnableWriteProtection(RTC);
return 0;
return err;
}
static int rtc_stm32_get_time(const struct device *dev, struct rtc_time *timeptr)