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Add alarm based button debouncing #24

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Add alarm based button debouncing #24

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54 changes: 39 additions & 15 deletions firmware/c/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
#include "trigger_basic.pio.h"

static bool armed = false;
static bool pulse = false;
static bool timeout_active = true;
static bool hvp_internal = true;
static absolute_time_t timeout_time;
Expand All @@ -23,6 +24,9 @@ static uint offset = 0xFFFFFFFF;
static uint32_t pulse_time;
static uint32_t pulse_delay_cycles;
static uint32_t pulse_time_cycles;
static bool button_enabled = true;
static int32_t button_alarm_id = 0;

static union float_union {float f; uint32_t ui32;} pulse_power;

void arm() {
Expand Down Expand Up @@ -79,6 +83,34 @@ void fast_trigger() {

}

// Alarm callback to re-enable buttons
int64_t button_enable(alarm_id_t alarm_id, void *user_data) {
button_enabled = true;
return 0;
}

void button_press_callback(uint gpio, uint32_t events) {
if(button_enabled) {
button_enabled = false;

update_timeout();
if(gpio == PIN_BTN_PULSE) {
pulse = true;
} else if(gpio == PIN_BTN_ARM) {
if(!armed) {
arm();
} else {
disarm();
}
}
} else {
cancel_alarm(button_alarm_id);
}

// Add an alarm to re-enable the buttons in 80ms (aka debounce time)
button_alarm_id = add_alarm_in_ms(80, button_enable, NULL, false);
}

int main() {
// Initialize USB-UART as STDIO
stdio_init_all();
Expand All @@ -98,6 +130,10 @@ int main() {
pulse_delay_cycles = PULSE_DELAY_CYCLES_DEFAULT;
pulse_time_cycles = PULSE_TIME_CYCLES_DEFAULT;

// Set button interrupt and callback function
gpio_set_irq_enabled_with_callback(PIN_BTN_ARM, GPIO_IRQ_LEVEL_HIGH, true, &button_press_callback);
gpio_set_irq_enabled(PIN_BTN_PULSE, GPIO_IRQ_LEVEL_LOW, true);

while(1) {
gpio_put(PIN_LED_HV, gpio_get(PIN_IN_CHARGED));

Expand Down Expand Up @@ -174,23 +210,11 @@ int main() {
}

// Pulse
if(gpio_get(PIN_BTN_PULSE)) {
update_timeout();
if(pulse) {
pulse = false;
picoemp_pulse(pulse_time);
}

if(gpio_get(PIN_BTN_ARM)) {
update_timeout();
if(!armed) {
arm();
} else {
disarm();
}
// YOLO debouncing
while(gpio_get(PIN_BTN_ARM));
sleep_ms(100);
}

if(!gpio_get(PIN_IN_CHARGED) && armed) {
picoemp_enable_pwm(pulse_power.f);
}
Expand All @@ -199,6 +223,6 @@ int main() {
disarm();
}
}

return 0;
}