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[nrf52840] fix millisecond alarm trigger condition (#3009)

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This commit is contained in:
Hubert Miś
2018-08-30 10:17:29 -07:00
committed by Jonathan Hui
parent 1aa0a9b5d8
commit 4665732e81
1 changed files with 9 additions and 5 deletions
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examples/platforms/nrf52840/alarm.c
+9 -5
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@@ -68,9 +68,10 @@
#define MS_PER_S 1000UL
#define MIN_RTC_COMPARE_EVENT_DT (2 * NRF_802154_US_PER_TICK) ///< Minimum time delta from now before RTC compare event is guaranteed to fire.
#define EPOCH_32BIT_US (1ULL << 32)
#define EPOCH_FROM_TIME(time) ((time) & ((uint64_t)UINT32_MAX << 32))
#define MIN_RTC_COMPARE_EVENT_TICKS 2 ///< Minimum number of RTC ticks delay that guarantees that RTC compare event will fire.
#define MIN_RTC_COMPARE_EVENT_DT (MIN_RTC_COMPARE_EVENT_TICKS * NRF_802154_US_PER_TICK) ///< Minimum time delta from now before RTC compare event is guaranteed to fire.
#define EPOCH_32BIT_US (1ULL << 32)
#define EPOCH_FROM_TIME(time) ((time) & ((uint64_t)UINT32_MAX << 32))
#define XTAL_ACCURACY 40 // The crystal used on nRF52840PDK has ±20ppm accuracy.
// clang-format on
@@ -370,6 +371,7 @@ static void AlarmStartAt(uint32_t aT0, uint32_t aDt, AlarmIndex aIndex)
uint32_t offset;
uint32_t rtc_value;
uint64_t now;
uint64_t now_rtc_protected;
GetOffsetAndCounter(&offset, &rtc_value);
now = GetTime(offset, rtc_value, aIndex);
@@ -378,10 +380,12 @@ static void AlarmStartAt(uint32_t aT0, uint32_t aDt, AlarmIndex aIndex)
if (rtc_value != GetRtcCounter())
{
now = GetCurrentTime(aIndex);
GetOffsetAndCounter(&offset, &rtc_value);
}
if (AlarmShallStrike(now + MIN_RTC_COMPARE_EVENT_DT, aIndex))
now_rtc_protected = GetTime(offset, rtc_value + MIN_RTC_COMPARE_EVENT_TICKS, aIndex);
if (AlarmShallStrike(now_rtc_protected, aIndex))
{
HandleCompareMatch(aIndex, true);