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Merge pull request #4964 from DavePutz/issue_4937

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Fix for issue #4937 - Implement minimum PulseOut time
This commit is contained in:
Scott Shawcroft 2021-07-16 11:29:32 -07:00 committed by GitHub
commit bba611336c
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 38 additions and 12 deletions
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46
ports/raspberrypi/common-hal/pulseio/PulseOut.c
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@ -43,22 +43,33 @@ 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;
static alarm_id_t cur_alarm;
void pulse_finish(void) {
void pulse_finish(pwmio_pwmout_obj_t *carrier) {
pulse_index++;
// Turn pwm pin off by setting duty cyle to 1.
common_hal_pwmio_pwmout_set_duty_cycle(pwmout_obj,1);
common_hal_pwmio_pwmout_set_duty_cycle(carrier,1);
if (pulse_index >= pulse_length) {
return;
}
add_alarm_in_us(pulse_buffer[pulse_index], pulseout_interrupt_handler, NULL, false);
if (pulse_index % 2 == 0) {
common_hal_pwmio_pwmout_set_duty_cycle(pwmout_obj,current_duty_cycle);
common_hal_pwmio_pwmout_set_duty_cycle(carrier,current_duty_cycle);
}
uint64_t delay = pulse_buffer[pulse_index];
if (delay < min_pulse) {
delay = min_pulse;
}
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, carrier, false);
delay = delay + 1;
}
}
int64_t pulseout_interrupt_handler(alarm_id_t id, void *user_data) {
pulse_finish();
pulse_finish(user_data);
return 0;
}
@ -75,9 +86,12 @@ void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t *self,
refcount++;
pwmout_obj = (pwmio_pwmout_obj_t *)carrier;
current_duty_cycle = common_hal_pwmio_pwmout_get_duty_cycle(pwmout_obj);
pwm_set_enabled(carrier->slice,false);
common_hal_pwmio_pwmout_set_duty_cycle(pwmout_obj,1);
self->pin = carrier->pin->number;
self->slice = carrier->slice;
pwm_set_enabled(pwmout_obj->slice,false);
self->carrier = pwmout_obj;
min_pulse = (1000000 / carrier->actual_frequency);
}
bool common_hal_pulseio_pulseout_deinited(pulseio_pulseout_obj_t *self) {
@ -97,9 +111,19 @@ void common_hal_pulseio_pulseout_send(pulseio_pulseout_obj_t *self, uint16_t *pu
pulse_index = 0;
pulse_length = length;
add_alarm_in_us(pulses[0], pulseout_interrupt_handler, NULL, false);
common_hal_pwmio_pwmout_set_duty_cycle(pwmout_obj,current_duty_cycle);
pwm_set_enabled(pwmout_obj->slice,true);
common_hal_pwmio_pwmout_set_duty_cycle(self->carrier,current_duty_cycle);
pwm_set_enabled(self->slice,true);
uint64_t delay = pulse_buffer[0];
if (delay < min_pulse) {
delay = min_pulse;
}
alarm_id_t init_alarm = 0;
// if the alarm cannot be set, try again with a longer delay
while (init_alarm == 0) {
init_alarm = add_alarm_in_us(delay, pulseout_interrupt_handler, self->carrier, false);
delay = delay + 1;
}
cur_alarm = init_alarm;
while (pulse_index < length) {
// Do other things while we wait. The interrupts will handle sending the
@ -107,6 +131,6 @@ 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);
pwm_set_enabled(pwmout_obj->slice,false);
common_hal_mcu_delay_us(min_pulse);
pwm_set_enabled(self->slice,false);
}

4
ports/raspberrypi/common-hal/pulseio/PulseOut.h
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@ -28,6 +28,7 @@
#define MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_PULSEIO_PULSEOUT_H
#include "common-hal/microcontroller/Pin.h"
#include "common-hal/pwmio/PWMOut.h"
#include "src/common/pico_time/include/pico/time.h"
#include "py/obj.h"
@ -38,9 +39,10 @@ typedef struct {
mp_obj_base_t base;
uint8_t pin;
uint8_t slice;
pwmio_pwmout_obj_t *carrier;
} pulseio_pulseout_obj_t;
void pulseout_reset(void);
int64_t pulseout_interrupt_handler(alarm_id_t id, void *user_data);
#endif // MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_PULSEIO_PULSEOUT_H
#endif // MICROPY_INCLUDED_ATMEL SAMD_COMMON_HAL_PULSEIO_PULSEOUT_H