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STM32 LPTICKER : read counter

pull/7009/head
jeromecoutant 2018-04-17 11:27:43 +02:00 committed by Bartek Szatkowski
parent 8179d96d4d
commit 2b8d6cbcc5
1 changed files with 6 additions and 1 deletions
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5
targets/TARGET_STM/lp_ticker.c
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@ -179,6 +179,11 @@ static void LPTIM1_IRQHandler(void)
uint32_t lp_ticker_read(void) uint32_t lp_ticker_read(void)
{ {
uint32_t lp_time = LPTIM1->CNT; uint32_t lp_time = LPTIM1->CNT;
/* Reading the LPTIM_CNT register may return unreliable values.
It is necessary to perform two consecutive read accesses and verify that the two returned values are identical */
while (lp_time != LPTIM1->CNT) {
lp_time = LPTIM1->CNT;
}
return lp_time; return lp_time;
} }