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[efr32] Allow calling otPlatAlarmMilliGetNow from an interrupt (#2398)

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Before this commit if otPlatAlarmMilliGetNow were called from an interrupt
the timer state could be corrupted.
This commit is contained in:
Tomas Cerskus
2017-12-07 17:32:41 +00:00
committed by Jonathan Hui
parent 56a12799b5
commit 3ddbb4213a
1 changed files with 10 additions and 1 deletions
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examples/platforms/efr32/alarm.c
+10 -1
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@@ -42,6 +42,7 @@
#include "utils/code_utils.h"
#include "em_core.h"
#include "rail.h"
static uint32_t sTimerHi = 0;
@@ -57,6 +58,10 @@ void efr32AlarmInit(void)
uint32_t otPlatAlarmMilliGetNow(void)
{
uint32_t timer_lo;
uint32_t timer_ms;
CORE_DECLARE_IRQ_STATE;
CORE_ENTER_CRITICAL();
timer_lo = RAIL_GetTime();
@@ -67,7 +72,11 @@ uint32_t otPlatAlarmMilliGetNow(void)
sTimerLo = timer_lo;
return (((uint64_t)sTimerHi << 32) | sTimerLo) / 1000;
timer_ms = (((uint64_t)sTimerHi << 32) | sTimerLo) / 1000;
CORE_EXIT_CRITICAL();
return timer_ms;
}
void otPlatAlarmMilliStartAt(otInstance *aInstance, uint32_t t0, uint32_t dt)