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Fix for issue #4937 - Implement minimum pulseout time

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root 2021-07-05 11:38:05 -05:00
parent c37f354d2d
commit 9814386d2e
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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@ -43,6 +43,7 @@ static volatile uint16_t pulse_index = 0;
static uint16_t pulse_length;
pwmio_pwmout_obj_t *pwmout_obj;
volatile uint16_t current_duty_cycle;
static uint32_t min_pulse = 0;
void pulse_finish(void) {
pulse_index++;
@ -51,7 +52,12 @@ void pulse_finish(void) {
if (pulse_index >= pulse_length) {
return;
}
add_alarm_in_us(pulse_buffer[pulse_index], pulseout_interrupt_handler, NULL, false);
uint64_t delay = pulse_buffer[pulse_index];
if (delay < min_pulse ) {
delay = min_pulse;
}
add_alarm_in_us(delay, pulseout_interrupt_handler, NULL, false);
if (pulse_index % 2 == 0) {
common_hal_pwmio_pwmout_set_duty_cycle(pwmout_obj,current_duty_cycle);
}
@ -78,6 +84,7 @@ void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t *self,
self->pin = carrier->pin->number;
self->slice = carrier->slice;
pwm_set_enabled(pwmout_obj->slice,false);
min_pulse = (1000000 / pwmout_obj->actual_frequency) / 2;
}
bool common_hal_pulseio_pulseout_deinited(pulseio_pulseout_obj_t *self) {
@ -107,6 +114,6 @@ void common_hal_pulseio_pulseout_send(pulseio_pulseout_obj_t *self, uint16_t *pu
RUN_BACKGROUND_TASKS;
}
// Short delay to give pin time to settle before disabling PWM
common_hal_mcu_delay_us(25);
common_hal_mcu_delay_us(min_pulse);
pwm_set_enabled(pwmout_obj->slice,false);
}