ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
targets/TARGET_STM/lp_ticker.c
View File

@ -179,7 +179,12 @@ static void LPTIM1_IRQHandler(void)
uint32_t lp_ticker_read(void)
{
uint32_t lp_time = LPTIM1->CNT;
return lp_time;
/* 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;
}
void lp_ticker_set_interrupt(timestamp_t timestamp)