djsundog/circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

atmel-samd: Account for pending ticks in PulseIn. Fixes #116.

Browse Source
This commit is contained in:
Scott Shawcroft 2017-04-13 14:47:34 -07:00
parent d1b15cf1a3
commit f0e24bd812
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
atmel-samd/common-hal/pulseio/PulseIn.c
View File

@ -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) {