Lab_interaccio/2014/Cuso/Cuso_audio_slave/Cuso_audio_slave.ino

#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


// 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(57600);
//  putstring_nl("WaveHC");
//  
//  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);
  
    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!");
}

float value = 0;
void loop() {
//  value = average(0)*2.54/2;
//  Serial.println(value);
//  if(value <30)
//  {
  if (Serial.available())
    {
      switch (Serial.read()){
        case '0':
          Serial.print('#');
          playcomplete("0.WAV");
          Serial.print('0');
          break;
        case '1':
          Serial.print('#');
          playcomplete("1.WAV");
          Serial.print('1');
          break;
        case '2':
          Serial.print('#');
          playcomplete("2.WAV");
          Serial.print('2');
          break;
        case '3':
          Serial.print('#');
          playcomplete("3.WAV");
          Serial.print('3');
          break;
        case '4':
          Serial.print('#');
          playcomplete("4.WAV");
          Serial.print('4');
          break;
        case '5':
          Serial.print('#');
          playcomplete("5.WAV");
          Serial.print('5');
          break;
        case '6':
          Serial.print('#');
          playcomplete("6.WAV");
          Serial.print('6');
          break;
        case '7':
          Serial.print('#');
          playcomplete("7.WAV");
          Serial.print('7');
          break;
        case '8':
          Serial.print('#');
          playcomplete("8.WAV");
          Serial.print('8');
          break;
        case '9':
          Serial.print('#');
          playcomplete("9.WAV");
          Serial.print('9');
          break;
      }
    }
//   delay(1000);
//  }
}

float average(int anaPin) {
  int lecturas = 4;
  long total = 0;
  float average = 0;
  for(int i=0; i<lecturas; i++)
  {
    //delay(1);
    total = total + analogRead(anaPin);
  }
  average = (float)total / lecturas;  
  return(average);
}

// 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);
}

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();
}