zephyrCommon: Add tone and noTone

- Add implementation of tone and noTone
- Currently duration not implemented

Signed-off-by: Ayush Singh <ayushdevel1325@gmail.com>

Author: Ayush1325

cores/arduino/main.cpp

@@ -12,6 +12,7 @@ int main(void) {
   for (;;) {
     loop();
     if (arduino::serialEventRun) arduino::serialEventRun();
+    k_yield();
   }
 
   return 0;

cores/arduino/zephyrCommon.cpp

@@ -201,6 +201,29 @@ PinStatus digitalRead(pin_size_t pinNumber) {
   return (gpio_pin_get_dt(&arduino_pins[pinNumber]) == 1) ? HIGH : LOW;
 }
 
+struct k_timer arduino_pin_timers[ARRAY_SIZE(arduino_pins)];
+
+void tone_expiry_cb(struct k_timer *timer) {
+	const struct gpio_dt_spec *spec = (gpio_dt_spec*)k_timer_user_data_get(timer);
+	gpio_pin_toggle_dt(spec);
+}
+
+void tone(pin_size_t pinNumber, unsigned int frequency, unsigned long duration) {
+	struct k_timer *timer = &arduino_pin_timers[pinNumber];
+	const struct gpio_dt_spec *spec = &arduino_pins[pinNumber];
+	k_timeout_t timeout = K_NSEC(NSEC_PER_SEC / (2 * frequency));
+
+	k_timer_init(timer, tone_expiry_cb, NULL);
+	k_timer_user_data_set(timer, (void*)spec);
+	gpio_pin_set_dt(spec, 1);
+	k_timer_start(timer, timeout, timeout);
+}
+
+void noTone(pin_size_t pinNumber) {
+	k_timer_stop(&arduino_pin_timers[pinNumber]);
+	gpio_pin_set_dt(&arduino_pins[pinNumber], 0);
+}
+
 void delay(unsigned long ms) { k_sleep(K_MSEC(ms)); }
 
 void delayMicroseconds(unsigned int us) { k_sleep(K_USEC(us)); }