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Add check for timer success

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root 2021-07-06 14:34:15 -05:00
parent b2e72b2912
commit bfa777c55a
1 changed files with 9 additions and 2 deletions
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11
ports/raspberrypi/common-hal/pulseio/PulseOut.c
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@ -44,9 +44,12 @@ static uint16_t pulse_length;
pwmio_pwmout_obj_t *pwmout_obj;
volatile uint16_t current_duty_cycle;
static uint32_t min_pulse = 0;
static alarm_id_t cur_alarm;
void pulse_finish(void) {
pulse_index++;
// Turn off the current alarm
cancel_alarm(cur_alarm);
// Turn pwm pin off by setting duty cyle to 1.
common_hal_pwmio_pwmout_set_duty_cycle(pwmout_obj,1);
if (pulse_index >= pulse_length) {
@ -56,8 +59,12 @@ void pulse_finish(void) {
if (delay < min_pulse) {
delay = min_pulse;
}
add_alarm_in_us(delay, pulseout_interrupt_handler, NULL, false);
cur_alarm = 0;
// if the alarm cannot be set, try again with a longer delay
while (cur_alarm == 0) {
cur_alarm = add_alarm_in_us(delay, pulseout_interrupt_handler, NULL, false);
delay = delay + 1;
}
if (pulse_index % 2 == 0) {
common_hal_pwmio_pwmout_set_duty_cycle(pwmout_obj,current_duty_cycle);
}