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stub.c

+#include "pico/stdlib.h"
+#include "hardware/pwm.h"
+#include "hardware/clocks.h"
+
+#define BUZZER_PIN 18 // This is both the buzzer and audio jack (just in case you have anything to plug into it)
+
+#define BUTTON_1_PIN 20
+#define BUTTON_2_PIN 21
+#define BUTTON_3_PIN 22
+
+#define FREQ_1 261.6256f
+#define FREQ_2 293.6648f
+#define FREQ_3 329.6276f
+
+/**
+ * A method for playing a note on the speaker.
+ * @param frequency Frequency of the note in Hz.
+*/
+void playNote(float frequency) {
+
+    // TODO - make a note of that frequency play on the buzzer
+
+}
+
+/**
+ * A method for silencing the speaker.
+*/
+void playNothing() {
+
+    // TODO - make the buzzer be silent
+
+}
+
+/**
+ * A method for handling GPIO events.
+ * @param gpio GPIO Number.
+ * @param event_mask Which events will cause an interrupt. See gpio_irq_level for details.
+*/
+void handleEvent(uint gpio, uint32_t event_mask) {
+
+    // TODO - link the events to the play methods
+
+}
+
+int main() {
+    stdio_init_all();
+
+    // Setting up the buzzer
+    gpio_set_function(BUZZER_PIN, GPIO_FUNC_PWM);
+
+    // Linking the buttons to the event handler
+    gpio_set_irq_enabled_with_callback(BUTTON_1_PIN, GPIO_IRQ_EDGE_FALL, true, &handleEvent);
+    gpio_set_irq_enabled_with_callback(BUTTON_2_PIN, GPIO_IRQ_EDGE_FALL, true, &handleEvent);
+    gpio_set_irq_enabled_with_callback(BUTTON_3_PIN, GPIO_IRQ_EDGE_FALL, true, &handleEvent);
+
+    gpio_set_irq_enabled_with_callback(BUTTON_1_PIN, GPIO_IRQ_EDGE_RISE, true, &handleEvent);
+    gpio_set_irq_enabled_with_callback(BUTTON_2_PIN, GPIO_IRQ_EDGE_RISE, true, &handleEvent);
+    gpio_set_irq_enabled_with_callback(BUTTON_3_PIN, GPIO_IRQ_EDGE_RISE, true, &handleEvent);
+
+    // Main Program Loop
+    while (true) {
+        tight_loop_contents();
+    }
+
+    return 0; // This will never be reached
+}