Merge pull request #6202 from jepler/issue5985
samd: Don't rely on RTC interrupt
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commit
47d3d0d7f8
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@ -247,7 +247,6 @@ static void rtc_init(void) {
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RTC_MODE0_CTRLA_COUNTSYNC;
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#endif
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RTC->MODE0.INTENSET.reg = RTC_MODE0_INTENSET_OVF;
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// Set all peripheral interrupt priorities to the lowest priority by default.
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for (uint16_t i = 0; i < PERIPH_COUNT_IRQn; i++) {
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@ -501,45 +500,34 @@ uint32_t port_get_saved_word(void) {
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// TODO: Move this to an RTC backup register so we can preserve it when only the BACKUP power domain
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// is enabled.
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static volatile uint64_t overflowed_ticks = 0;
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static uint32_t rtc_old_count;
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static uint32_t _get_count(uint64_t *overflow_count) {
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while (1) {
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// Disable interrupts so we can grab the count and the overflow atomically.
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common_hal_mcu_disable_interrupts();
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#ifdef SAM_D5X_E5X
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while ((RTC->MODE0.SYNCBUSY.reg & (RTC_MODE0_SYNCBUSY_COUNTSYNC | RTC_MODE0_SYNCBUSY_COUNT)) != 0) {
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}
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#endif
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// SAMD21 does continuous sync so we don't need to wait here.
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uint32_t count = RTC->MODE0.COUNT.reg;
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if (overflow_count != NULL) {
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*overflow_count = overflowed_ticks;
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}
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bool overflow_pending = RTC->MODE0.INTFLAG.bit.OVF;
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common_hal_mcu_enable_interrupts();
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if (!overflow_pending) {
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return count;
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}
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// Try again if overflow hasn't been processed yet.
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#ifdef SAM_D5X_E5X
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while ((RTC->MODE0.SYNCBUSY.reg & (RTC_MODE0_SYNCBUSY_COUNTSYNC | RTC_MODE0_SYNCBUSY_COUNT)) != 0) {
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}
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#endif
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// SAMD21 does continuous sync so we don't need to wait here.
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uint32_t count = RTC->MODE0.COUNT.reg;
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if (count < rtc_old_count) {
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// Our RTC is 32 bits and we're clocking it at 16.384khz which is 16 (2 ** 4) subticks per
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// tick.
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overflowed_ticks += (1L << (32 - 4));
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}
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rtc_old_count = count;
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if (overflow_count != NULL) {
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*overflow_count = overflowed_ticks;
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}
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return count;
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}
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volatile bool _woken_up;
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void RTC_Handler(void) {
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uint32_t intflag = RTC->MODE0.INTFLAG.reg;
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if (intflag & RTC_MODE0_INTFLAG_OVF) {
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RTC->MODE0.INTFLAG.reg = RTC_MODE0_INTFLAG_OVF;
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// Our RTC is 32 bits and we're clocking it at 16.384khz which is 16 (2 ** 4) subticks per
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// tick.
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overflowed_ticks += (1L << (32 - 4));
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}
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#ifdef SAM_D5X_E5X
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if (intflag & RTC_MODE0_INTFLAG_PER2) {
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RTC->MODE0.INTFLAG.reg = RTC_MODE0_INTFLAG_PER2;
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