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common_rtc_set_interrupt: Wrap <ticks_count> before comparisons 

RTC counter is 24-bit. Upper layer handles counter size and wraps ticks count when interrupt is to be fired before passing it to common_rtc_set_interrupt(), but for consistency and safety reasons we can wrap it again in the NRF driver.
pull/7172/head
Przemyslaw Stekiel 2018-05-23 13:34:35 +02:00
parent ccba52b45b
commit 4d56b006d1
1 changed files with 5 additions and 2 deletions
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7
targets/TARGET_NORDIC/TARGET_NRF5x/common_rtc.c
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@ -194,6 +194,9 @@ void common_rtc_set_interrupt(uint32_t ticks_count, uint32_t cc_channel,
core_util_critical_section_enter(); core_util_critical_section_enter();
/* Wrap ticks_count before comparisons. */
ticks_count = RTC_WRAP(ticks_count);
/* COMPARE occurs when a CC register is N and the COUNTER value transitions from N-1 to N. /* COMPARE occurs when a CC register is N and the COUNTER value transitions from N-1 to N.
* If the COUNTER is N, writing N+2 to a CC register is guaranteed to trigger a * If the COUNTER is N, writing N+2 to a CC register is guaranteed to trigger a
* COMPARE event at N+2. * COMPARE event at N+2.
@ -202,10 +205,10 @@ void common_rtc_set_interrupt(uint32_t ticks_count, uint32_t cc_channel,
if (now == ticks_count || if (now == ticks_count ||
RTC_WRAP(now + 1) == ticks_count) { RTC_WRAP(now + 1) == ticks_count) {
ticks_count += 2; ticks_count = RTC_WRAP(ticks_count + 2);
} }
nrf_rtc_cc_set(COMMON_RTC_INSTANCE, cc_channel, RTC_WRAP(ticks_count)); nrf_rtc_cc_set(COMMON_RTC_INSTANCE, cc_channel, ticks_count);
if (!nrf_rtc_int_is_enabled(COMMON_RTC_INSTANCE, int_mask)) { if (!nrf_rtc_int_is_enabled(COMMON_RTC_INSTANCE, int_mask)) {
nrf_rtc_event_clear(COMMON_RTC_INSTANCE, LP_TICKER_EVENT); nrf_rtc_event_clear(COMMON_RTC_INSTANCE, LP_TICKER_EVENT);