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Topic: Waveshield + Arduino Mega -> Distorted sound (Read 3077 times) previous topic - next topic

dywen

Hi,

I run
- Ubuntu 10.04
- Arduino 21
use
- Arduino Mega 1280
- Waveshield 1.1

I have sound when I push buttons - but it is distorted:
http://www.lo-bat.be/wendy/waveshield/Waveshield_slightly_distorted_sound.mp3

Not your usual distorted but a rrrrr (rolling r's - http://en.wikipedia.org/wiki/Alveolar_trill) sound extra

Here are a few of my original sounds - the ones which are on the SD-card of the wavsehield
http://www.lo-bat.be/wendy/waveshield/SOUND1.wav
http://www.lo-bat.be/wendy/waveshield/SOUND13.wav
http://www.lo-bat.be/wendy/waveshield/SOUND14.wav

Here is an image of the waveshield  - with the modifications indicated here:
http://forums.adafruit.com/viewtopic.php?f=31&t=10939&start=45 -> instructions given by fat16lib

Photograph of the Waveshield & Mega
http://www.lo-bat.be/wendy/waveshield/mega_and_waveshield.JPG
(the copper thingy in the corner connects my buttons to the ground - and there is no current flowing between the pins 50-53 and the ground...)

My code for playing the 20 sound files:
Code: [Select]
#include <FatReader.h>
#include <SdReader.h>
#include <avr/pgmspace.h>
#include "WaveUtil.h"
#include "WaveHC.h"


SdReader card;    // This object holds the information for the card
FatVolume vol;    // This holds the information for the partition on the card
FatReader root;   // This holds the information for the filesystem on the card
FatReader f;      // This holds the information for the file we're play

WaveHC wave;      // This is the only wave (audio) object, since we will only play one at a time

#define DEBOUNCE 5  // button debouncer

// here is where we define the buttons that we'll use. button "1" is the first, button "6" is the 6th, etc
byte buttons[] = {22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41};
// This handy macro lets us determine how big the array up above is, by checking the size
#define NUMBUTTONS sizeof(buttons)
// we will track if a button is just pressed, just released, or 'pressed' (the current state
volatile byte pressed[NUMBUTTONS], justpressed[NUMBUTTONS], justreleased[NUMBUTTONS];

// this handy function will return the number of bytes currently free in RAM, great for debugging!  
int freeRam(void)
{
 extern int  __bss_end;
 extern int  *__brkval;
 int free_memory;
 if((int)__brkval == 0) {
   free_memory = ((int)&free_memory) - ((int)&__bss_end);
 }
 else {
   free_memory = ((int)&free_memory) - ((int)__brkval);
 }
 return free_memory;
}

void sdErrorCheck(void)
{
 if (!card.errorCode()) return;
 putstring("\n\rSD I/O error: ");
 Serial.print(card.errorCode(), HEX);
 putstring(", ");
 Serial.println(card.errorData(), HEX);
 while(1);
}

void setup() {
 byte i;
 
 // set up serial port
 Serial.begin(9600);
 putstring_nl("WaveHC with ");
 Serial.print(NUMBUTTONS, DEC);
 putstring_nl("buttons");
 
 putstring("Free RAM: ");       // This can help with debugging, running out of RAM is bad
 Serial.println(freeRam());      // if this is under 150 bytes it may spell trouble!
 
 // Set the output pins for the DAC control. This pins are defined in the library
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
 pinMode(4, OUTPUT);
 pinMode(5, OUTPUT);

 // pin13 LED
 pinMode(13, OUTPUT);

 // Make input & enable pull-up resistors on switch pins
 for (i=0; i< NUMBUTTONS; i++) {
   pinMode(buttons[i], INPUT);
   digitalWrite(buttons[i], HIGH);
 }
 
 //  if (!card.init(true)) { //play with 4 MHz spi if 8MHz isn't working for you
 if (!card.init()) {         //play with 8 MHz spi (default faster!)  
   putstring_nl("Card init. failed!");  // Something went wrong, lets print out why
   sdErrorCheck();
   while(1);                            // then 'halt' - do nothing!
 }
 
 // enable optimize read - some cards may timeout. Disable if you're having problems
 card.partialBlockRead(true);

// Now we will look for a FAT partition!
 uint8_t part;
 for (part = 0; part < 5; part++) {     // we have up to 5 slots to look in
   if (vol.init(card, part))
     break;                             // we found one, lets bail
 }
 if (part == 5) {                       // if we ended up not finding one  :(
   putstring_nl("No valid FAT partition!");
   sdErrorCheck();      // Something went wrong, lets print out why
   while(1);                            // then 'halt' - do nothing!
 }
 
 // Lets tell the user about what we found
 putstring("Using partition ");
 Serial.print(part, DEC);
 putstring(", type is FAT");
 Serial.println(vol.fatType(),DEC);     // FAT16 or FAT32?
 
 // Try to open the root directory
 if (!root.openRoot(vol)) {
   putstring_nl("Can't open root dir!"); // Something went wrong,
   while(1);                             // then 'halt' - do nothing!
 }
 
 // Whew! We got past the tough parts.
 putstring_nl("Ready!");
 
 TCCR2A = 0;
 TCCR2B = 1<<CS22 | 1<<CS21 | 1<<CS20;

 //Timer2 Overflow Interrupt Enable
 TIMSK2 |= 1<<TOIE2;


}

SIGNAL(TIMER2_OVF_vect) {
 check_switches();
}

void check_switches()
{
 static byte previousstate[NUMBUTTONS];
 static byte currentstate[NUMBUTTONS];
 byte index;

 for (index = 0; index < NUMBUTTONS; index++) {
   currentstate[index] = digitalRead(buttons[index]);   // read the button
   
   /*    
   Serial.print(index, DEC);
   Serial.print(": cstate=");
   Serial.print(currentstate[index], DEC);
   Serial.print(", pstate=");
   Serial.print(previousstate[index], DEC);
   Serial.print(", press=");
   */
   
   if (currentstate[index] == previousstate[index]) {
     if ((pressed[index] == LOW) && (currentstate[index] == LOW)) {
         // just pressed
         justpressed[index] = 1;
     }
     else if ((pressed[index] == HIGH) && (currentstate[index] == HIGH)) {
         // just released
         justreleased[index] = 1;
     }
     pressed[index] = !currentstate[index];  // remember, digital HIGH means NOT pressed
   }
   //Serial.println(pressed[index], DEC);
   previousstate[index] = currentstate[index];   // keep a running tally of the buttons
 }
}


void loop() {
 byte i;
 
 if (justpressed[0]) {
   justpressed[0] = 0;
   playfile("SOUND1.WAV");
 }
 else if (justpressed[1]) {
     justpressed[1] = 0;
     playfile("SOUND2.WAV");
 }
[color=pink] ////////This code repeated for all the files -> till 20////////////////[/color]
}



// Plays a full file from beginning to end with no pause.
void playcomplete(char *name) {
 // call our helper to find and play this name
 playfile(name);
 while (wave.isplaying) {
 // do nothing while its playing
 }
 // now its done playing
}

void playfile(char *name) {
 // see if the wave object is currently doing something
 if (wave.isplaying) {// already playing something, so stop it!
   wave.stop(); // stop it
 }
 // look in the root directory and open the file
 if (!f.open(root, name)) {
   putstring("Couldn't open file "); Serial.print(name); return;
 }
 // OK read the file and turn it into a wave object
 if (!wave.create(f)) {
   putstring_nl("Not a valid WAV"); return;
 }
 
 // ok time to play! start playback
 wave.play();
}


I have no idea why I have the distortion :-/
Any clues? Que pasa?

Bizarre: running the Daphc sketch (which plays all sounds it finds on the sd-card) gives me no distortion whatsoever.
:?:

I have posted this problem also here:  http://forums.adafruit.com/viewtopic.php?f=31&t=20229&p=105611#p105611

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