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zephyrCommon: Implement pulseIn #101

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Merged
merged 1 commit into from
Jun 19, 2024
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zephyrCommon: Implement pulseIn #101

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44 changes: 44 additions & 0 deletions cores/arduino/zephyrCommon.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -349,3 +349,47 @@ long random(long max) {
}

#endif

#ifdef CONFIG_GPIO_GET_DIRECTION

unsigned long pulseIn(pin_size_t pinNumber, uint8_t state, unsigned long timeout) {
struct k_timer timer;
int64_t start, end, delta = 0;
const struct gpio_dt_spec *spec = &arduino_pins[pinNumber];

k_timer_init(&timer, NULL, NULL);
k_timer_start(&timer, K_MSEC(timeout), K_NO_WAIT);

if (!gpio_is_ready_dt(spec)) {
goto cleanup;
}

if (!gpio_pin_is_input_dt(spec)) {
goto cleanup;
}

while(gpio_pin_get_dt(spec) == state && k_timer_status_get(&timer) == 0);
if (k_timer_status_get(&timer) > 0) {
goto cleanup;
}

while(gpio_pin_get_dt(spec) != state && k_timer_status_get(&timer) == 0);
if (k_timer_status_get(&timer) > 0) {
goto cleanup;
}

start = k_uptime_ticks();
while(gpio_pin_get_dt(spec) == state && k_timer_status_get(&timer) == 0);
if (k_timer_status_get(&timer) > 0) {
goto cleanup;
}
end = k_uptime_ticks();

delta = k_ticks_to_us_floor64(end - start);

cleanup:
k_timer_stop(&timer);
return (unsigned long)delta;
}

#endif // CONFIG_GPIO_GET_DIRECTION
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