Hi,
Using a Teensy 3.6 board (with no shield), a SanDisk Ultra SD card and a pair of amplified PC speakers, I am trying to build a "sound board": short sounds are triggered by touch sensitive pins, up to 4 sounds can be played at the same time.
It _mostly_ works, but I face a strange issue: randomly, one of the AudioPlaySdWav objects sometimes streams out a kind of "pulsed white noise" until the end of the track (it generally succeeds to read the next file anyway).
I managed to reproduce the problem with the simplified sketch here:
You also need to load a SD card in the slot, containing 4 short WAV files named 1.WAV to 4.WAV.
As you see, the FILE_EXISTS and TOUCH_READ items can be defined or not, enabling or not the use of SD.sdfs.exists() and touchRead() functions.
When both items are defined, one of the AudioPlaySdWav objects crash randomly about once per 30-50 played tracks, even with only 2 or 3 active AudioPlaySdWav objects (so less required bandwidth from the SD card and less CPU load).
If one of these two items (or both) are not defined, it seems everything works fine.
Actually, I really don't understand what could be the source of such a conflict between AudioPlaySdWav.play(), SD.sdfs.exists() and touchRead() functions. I didn't found anything on the web, but I may not search with the accurate words.
Any idea?
Thanks in advance
Using a Teensy 3.6 board (with no shield), a SanDisk Ultra SD card and a pair of amplified PC speakers, I am trying to build a "sound board": short sounds are triggered by touch sensitive pins, up to 4 sounds can be played at the same time.
It _mostly_ works, but I face a strange issue: randomly, one of the AudioPlaySdWav objects sometimes streams out a kind of "pulsed white noise" until the end of the track (it generally succeeds to read the next file anyway).
I managed to reproduce the problem with the simplified sketch here:
Code:
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
// GUItool: begin automatically generated code
AudioPlaySdWav playSdWav1; //xy=363,224
AudioPlaySdWav playSdWav3; //xy=365,373
AudioPlaySdWav playSdWav4; //xy=367,453
AudioPlaySdWav playSdWav2; //xy=368,297
AudioMixer4 mixer2; //xy=700,374
AudioMixer4 mixer1; //xy=701,278
AudioOutputAnalogStereo dacs1; //xy=880,326
AudioConnection patchCord1(playSdWav1, 0, mixer1, 0);
AudioConnection patchCord2(playSdWav1, 1, mixer2, 0);
AudioConnection patchCord3(playSdWav3, 0, mixer1, 2);
AudioConnection patchCord4(playSdWav3, 1, mixer2, 2);
AudioConnection patchCord5(playSdWav4, 0, mixer1, 3);
AudioConnection patchCord6(playSdWav4, 1, mixer2, 3);
AudioConnection patchCord7(playSdWav2, 0, mixer1, 1);
AudioConnection patchCord8(playSdWav2, 1, mixer2, 1);
AudioConnection patchCord9(mixer2, 0, dacs1, 1);
AudioConnection patchCord10(mixer1, 0, dacs1, 0);
// GUItool: end automatically generated code
AudioPlaySdWav *playSdWav[4] = { &playSdWav1, &playSdWav2, &playSdWav3, &playSdWav4 };
const int touch_pins[11] = { 0, 1, 29, 30, 15, 16, 17, 18, 19, 22, 23 };
/*
* When these both items are defined, I randomly get "pulsed white noise"
* from AudioPlaySdWav objects. Otherwise, no problem!
*/
#define FILE_EXISTS
#define TOUCH_READ
void setup() {
AudioMemory(8);
SD.sdfs.begin(SdioConfig(DMA_SDIO));
for (int i = 0; i < 4; ++i) {
mixer1.gain(i, 0.1);
mixer2.gain(i, 0.1);
}
}
void play_track(int i) {
char filename[7];
strcpy(filename, "0.WAV");
filename[0] = '0' + i + 1;
#ifdef FILE_EXISTS
if (SD.sdfs.exists(filename)) {
playSdWav[i]->play(filename);
}
#else
playSdWav[i]->play(filename);
#endif
}
void loop() {
for (int i = 0; i < 4; ++i) {
#ifdef TOUCH_READ
for (int j = 0; j < 11; ++j) {
touchRead(touch_pins[j]);
}
#endif
if (!playSdWav[i]->isPlaying()) {
play_track(i);
delay(100);
}
}
}As you see, the FILE_EXISTS and TOUCH_READ items can be defined or not, enabling or not the use of SD.sdfs.exists() and touchRead() functions.
When both items are defined, one of the AudioPlaySdWav objects crash randomly about once per 30-50 played tracks, even with only 2 or 3 active AudioPlaySdWav objects (so less required bandwidth from the SD card and less CPU load).
If one of these two items (or both) are not defined, it seems everything works fine.
Actually, I really don't understand what could be the source of such a conflict between AudioPlaySdWav.play(), SD.sdfs.exists() and touchRead() functions. I didn't found anything on the web, but I may not search with the accurate words.
Any idea?
Thanks in advance