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| author | Scott Shawcroft <scott.shawcroft@gmail.com> | 2017-04-13 14:47:34 -0700 |
|---|---|---|
| committer | Scott Shawcroft <scott.shawcroft@gmail.com> | 2017-04-13 14:47:34 -0700 |
| commit | f0e24bd81270227fff63644b3a12444b5d0e5a4f (patch) | |
| tree | 66070a7b11a7e8973b2d16e7b71e18dbe0d3aff3 | |
| parent | d1b15cf1a3070581a781a80fd55a346e4849950b (diff) | |
atmel-samd: Account for pending ticks in PulseIn. Fixes #116.
| -rw-r--r-- | atmel-samd/common-hal/pulseio/PulseIn.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/atmel-samd/common-hal/pulseio/PulseIn.c b/atmel-samd/common-hal/pulseio/PulseIn.c index de40ff036..920b7f34d 100644 --- a/atmel-samd/common-hal/pulseio/PulseIn.c +++ b/atmel-samd/common-hal/pulseio/PulseIn.c @@ -78,7 +78,9 @@ static void pulsein_set_config(pulseio_pulsein_obj_t* self, bool first_edge) { static void pulsein_callback(void) { // Grab the current time first. uint16_t current_us = tc_get_count_value(&ms_timer); - uint64_t current_ms = ticks_ms; + // Add the overflow flag to account for tick interrupts that are blocked by + // this interrupt. + uint64_t current_ms = ticks_ms + TC5->COUNT16.INTFLAG.bit.OVF; pulseio_pulsein_obj_t* self = active_pulseins[extint_get_current_channel()]; current_us = current_us * 1000 / self->ticks_per_ms; if (self->first_edge) { |