Audio

Basic Library

Digital I/O
Analog I/O
Advanced I/O
Time
Math
Trigonometry
Random Numbers
Bits and Bytes
Interrupts
Serial Comm.

Standard Library

Camera
Servo Motor
Stepping Motor
Character LCD
SPI
I²C (Wire)
SD Card
SD (File Operations)
Periodic Operation
Clock (RTC)

Mbed Tips

Overview
Storage
Wi-Fi
TLS (HTTPS)
Audio
Microphone
BLE

Audio

Play music with the audio jack using the EasyPlayback library.

Example

WAV files saved on an SD card are played sequentially.

#include <Arduino.h>
#include "SdUsbConnect.h"
#include "EasyPlayback.h"
#include "EasyDec_WavCnv2ch.h"
 
#define FILE_NAME_LEN          (64)
#define MOUNT_NAME             "storage"
 
static InterruptIn skip_btn(USER_BUTTON0);
static EasyPlayback AudioPlayer;
 
static void skip_btn_fall(void) {
    AudioPlayer.skip();
}
 
void setup() {
    DIR  * d;
    struct dirent * p;
    char file_path[sizeof("/"MOUNT_NAME"/") + FILE_NAME_LEN];
    SdUsbConnect storage(MOUNT_NAME);
 
    // decoder setting
    AudioPlayer.add_decoder(".wav");
    AudioPlayer.add_decoder(".WAV");
 
    // volume control
    AudioPlayer.outputVolume(0.5);  // Volume control (min:0.0 max:1.0)
 
    // button setting
    skip_btn.fall(&skip_btn_fall);
 
    while (1) {
        storage.wait_connect();
        // file search
        d = opendir("/"MOUNT_NAME"/");
        while ((p = readdir(d)) != NULL) {
            size_t len = strlen(p->d_name);
            if (len < FILE_NAME_LEN) {
                // make file path
                sprintf(file_path, "/%s/%s", MOUNT_NAME, p->d_name);
                printf("%s\r\n", file_path);
 
                // playback
                AudioPlayer.play(file_path);
            }
        }
        closedir(d);
    }
}
 
void loop() {
 
}