audio and file handling on SD card


Hi there,

I have an audio sketch perfectly playing 4 wav files to mix them but when I'm doing files edition on the SD the player does nothing, then, after a while, is only able to play one file at once.
I think the SD card is busy but I don't figure out how to make it free for multiple audio files reading. I thought it was enough to close the file opened by

In the sketch below, everything is doing fine until I uncomment the line in the loop section.
Thanks for your help !

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

// GUItool: begin automatically generated code
AudioPlaySdWav           playSdWav4;     //xy=82,315
AudioPlaySdWav           playSdWav3;     //xy=86,232
AudioPlaySdWav           playSdWav2;     //xy=112,151
AudioPlaySdWav           playSdWav1;     //xy=140,79
AudioMixer4              mixer2;         //xy=296,267
AudioMixer4              mixer1;         //xy=312,153
AudioInputI2S            i2s2;           //xy=353,355
AudioMixer4              mixer3;         //xy=490,220
AudioAnalyzePeak         peak1;          //xy=567,355
AudioOutputI2S           i2s1;           //xy=672,218
AudioConnection          patchCord1(playSdWav4, 0, mixer2, 2);
AudioConnection          patchCord2(playSdWav4, 1, mixer2, 3);
AudioConnection          patchCord3(playSdWav3, 0, mixer2, 0);
AudioConnection          patchCord4(playSdWav3, 1, mixer2, 1);
AudioConnection          patchCord5(playSdWav2, 0, mixer1, 2);
AudioConnection          patchCord6(playSdWav2, 1, mixer1, 3);
AudioConnection          patchCord7(playSdWav1, 0, mixer1, 0);
AudioConnection          patchCord8(playSdWav1, 1, mixer1, 1);
AudioConnection          patchCord9(mixer2, 0, mixer3, 1);
AudioConnection          patchCord10(mixer1, 0, mixer3, 0);
AudioConnection          patchCord11(i2s2, 0, mixer3, 2);
AudioConnection          patchCord12(i2s2, 0, peak1, 0);
AudioConnection          patchCord13(mixer3, 0, i2s1, 0);
AudioConnection          patchCord14(mixer3, 0, i2s1, 1);
AudioControlSGTL5000     sgtl5000_1;     //xy=226,461
// GUItool: end automatically generated code

const int chipSelect = 10;

int points = 0;

File fichier;

void setup() {
   if (!(SD.begin(chipSelect))) {
    while (1) {
      Serial.println("Unable to access the SD card");

  mixer3.gain(0, 1);
  mixer3.gain(1, 1);
  mixer3.gain(2, 0);
  mixer3.gain(3, 0);

void joueTout() {
 if (playSdWav1.isPlaying() == false) {"PIST1ET2.WAV");
    delay(10); // wait for library to parse WAV info
  if (playSdWav2.isPlaying() == false) {"PIST3ET4.WAV");
    delay(10); // wait for library to parse WAV info
   if (playSdWav3.isPlaying() == false) {"PIST5ET6.WAV");
    delay(10); // wait for library to parse WAV info
   if (playSdWav4.isPlaying() == false) {"PIST7ET8.WAV");
    delay(10); // wait for library to parse WAV info

void mixON() {
  float volMix = 0.5;
  mixer1.gain(0, volMix);
  mixer1.gain(1, volMix);
  mixer1.gain(2, volMix);
  mixer1.gain(3, volMix);
  mixer2.gain(0, volMix);
  mixer2.gain(1, volMix);
  mixer2.gain(2, volMix);
  mixer2.gain(3, volMix);

void mixOFF() {
  mixer1.gain(0, 0);
  mixer1.gain(1, 0);
  mixer1.gain(2, 0);
  mixer1.gain(3, 0);
  mixer2.gain(0, 0);
  mixer2.gain(1, 0);
  mixer2.gain(2, 0);
  mixer2.gain(3, 0);

void loop() {

   // fichier ="points.txt", FILE_WRITE); if (fichier) {fichier.println(points); fichier.close();}
    joueTout(); mixON();