pwm-buzzer-tone-8.ino
Uses the Sapphire PWM module to drive a passive buzzer and produce musical notes.
Connect a passive buzzer between the GPIO pin set to PWM mode and ground. Configure the PWM base frequency. The example generates a C-E-G triad. Adjust delays for tempo. Requires GPIO multiplexing configuration in the Efinity constraint file.
pwm-buzzer-tone-8.ino
#include "xhal_pwm.h"
#include "xhal_gpio.h"
#include "xhal_timer.h"
#define BUZZER_PIN GPIO_PIN_10 // Pin PWM capable
#define PWM_INSTANCE XHAL_PWM0
#define PWM_CHANNEL 0
// Fréquences musicales (approx)
#define NOTE_C4 262
#define NOTE_E4 330
#define NOTE_G4 392
void play_note(int freq, int duration_ms) {
if (freq > 0) {
xhal_pwm_set_duty(PWM_INSTANCE, PWM_CHANNEL, 50); // 50% duty
xhal_pwm_set_freq(HZ, freq); // Hypothetical API or calculate period
xhal_pwm_enable(PWM_INSTANCE, PWM_CHANNEL);
} else {
xhal_pwm_disable(PWM_INSTANCE, PWM_CHANNEL);
}
xhal_timer_delay_ms(duration_ms);
xhal_pwm_disable(PWM_INSTANCE, PWM_CHANNEL);
}
int main(void) {
xhal_gpio_init();
xhal_gpio_config(BUZZER_PIN, GPIO_ALTERNATE); // Set to PWM function
xhal_pwm_init(PWM_INSTANCE, 1000000); // Base clock
while(1) {
play_note(NOTE_C4, 200);
play_note(NOTE_E4, 200);
play_note(NOTE_G4, 200);
play_note(0, 200); // Silence
}
}