Hi!
Any help would be most appreciated. We successfully have a waveshield running all the files on our SD card using the code below (from ladyada.com).
It runs the files in the same order every time. We need the files to run at random.
Does anyone know how to adjust our code so it plays the files at random?
Best.
D-Man
#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
uint8_t dirLevel; // indent level for file/dir names (for prettyprinting)
dir_t dirBuf; // buffer for directory reads
WaveHC wave; // This is the only wave (audio) object, since we will only play one at a time
// Function definitions (we define them here, but the code is below)
void lsR(FatReader &d);
void play(FatReader &dir);
void setup() {
Serial.begin(9600); // set up Serial library at 9600 bps for debugging
putstring_nl("\nWave test!"); // say we woke up!
putstring("Free RAM: "); // This can help with debugging, running out of RAM is bad
Serial.println(freeRam());
// 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);
// 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("Files found:");
dirLevel = 0;
// Print out all of the files in all the directories.
lsR(root);
}
//////////////////////////////////// LOOP
void loop() {
root.rewind();
play(root);
}
/////////////////////////////////// HELPERS
// 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;
}
/*
- print error message and halt if SD I/O error, great for debugging!
/
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);
}
/ - print dir_t name field. The output is 8.3 format, so like SOUND.WAV or FILENAME.DAT
*/
void printName(dir_t &dir)
{
for (uint8_t i = 0; i < 11; i++) { // 8.3 format has 8+3 = 11 letters in it
if (dir.name == ' ') - continue; // dont print any spaces in the name*
- if (i == 8)*
- Serial.print('.'); // after the 8th letter, place a dot*
_ Serial.print(dir.name*); // print the n'th digit*_
* }*
* if (DIR_IS_SUBDIR(dir))
_ Serial.print('/'); // directories get a / at the end*_
}
/*
* list recursively - possible stack overflow if subdirectories too nested
*/
void lsR(FatReader &d)
{
* int8_t r; // indicates the level of recursion*
* while ((r = d.readDir(dirBuf)) > 0) { // read the next file in the directory*
* // skip subdirs . and ..*
* if (dirBuf.name[0] == '.')*
* continue;*
* for (uint8_t i = 0; i < dirLevel; i++)
_ Serial.print(' '); // this is for prettyprinting, put spaces in front*_
* printName(dirBuf); // print the name of the file we just found*
* Serial.println(); // and a new line*
* if (DIR_IS_SUBDIR(dirBuf)) { // we will recurse on any direcory*
* FatReader s; // make a new directory object to hold information*
* dirLevel += 2; // indent 2 spaces for future prints*
* if (s.open(vol, dirBuf))*
* lsR(s); // list all the files in this directory now!*
* dirLevel -=2; // remove the extra indentation*
* }*
* }*
* sdErrorCheck(); // are we doign OK?*
}
/*
* play recursively - possible stack overflow if subdirectories too nested
*/
void play(FatReader &dir)
{
* FatReader file;*
* while (dir.readDir(dirBuf) > 0) { // Read every file in the directory one at a time*
* // skip . and .. directories*
* if (dirBuf.name[0] == '.')*
* continue;*
* Serial.println(); // clear out a new line*
* for (uint8_t i = 0; i < dirLevel; i++)
_ Serial.print(' '); // this is for prettyprinting, put spaces in front*_
* if (!file.open(vol, dirBuf)) { // open the file in the directory*
* Serial.println("file.open failed"); // something went wrong :(*
* while(1); // halt*
* }*
* if (file.isDir()) { // check if we opened a new directory*
* putstring("Subdir: ");*
* printName(dirBuf);*
* dirLevel += 2; // add more spaces*
* // play files in subdirectory*
* play(file); // recursive!*
* dirLevel -= 2; *
* }*
* else {*
* // Aha! we found a file that isnt a directory*
* putstring("Playing "); printName(dirBuf); // print it out*
* if (!wave.create(file)) { // Figure out, is it a WAV proper?*
* putstring(" Not a valid WAV"); // ok skip it*
* } else {*
* Serial.println(); // Hooray it IS a WAV proper!*
* wave.play(); // make some noise!*
* while (wave.isplaying) { // playing occurs in interrupts, so we print dots in realtime*
* putstring(".");*
* delay(100);*
* }*
* sdErrorCheck(); // everything OK?*
// if (wave.errors)Serial.println(wave.errors); // wave decoding errors
* }*
* }*
* }*
}