Audio code for the adafruit wav shield

breville_tea_audio.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

byte PrevValUpin = HIGH; // Storing the previous reading to "debounce" startup of the current sense board
byte PrevValDpin = HIGH;

int DownPinNum = 8; // The pins to sense the up/down signals
int UpPinNum = 9;

// 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;
  Serial.println("\n\rSD I/O error: ");
  Serial.print(card.errorCode(), HEX);
  Serial.print(", ");
  Serial.println(card.errorData(), HEX);
  while(1);
}

void setup() {
  // set up serial port
  Serial.begin(9600);
  
  // 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);
 
  // Listening on these pins for triggers
  pinMode(DownPinNum, INPUT);  // Basket down
  pinMode(UpPinNum, INPUT);  // Basket up

  if (!card.init()) {         //play with 8 MHz spi (default faster!)  
    Serial.println("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  :(
    Serial.println("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
  Serial.print("Using partition ");
  Serial.print(part, DEC);
  Serial.print(", type is FAT");
  Serial.println(vol.fatType(),DEC);     // FAT16 or FAT32?
  
  // Try to open the root directory
  if (!root.openRoot(vol)) {
    Serial.println("Can't open root dir!"); // Something went wrong,
    while(1);                             // then 'halt' - do nothing!
  }
  
  delay(5000); // wait a few seconds for the secondary board to boot
}

void loop() {
  byte downPin;
  byte upPin;
  downPin = digitalRead(DownPinNum);
  upPin = digitalRead(UpPinNum);
   
  if (PrevValDpin == LOW && downPin == HIGH){
    Serial.print("DOWN");
    playcomplete("DOWN.wav");
    delay(1000);
  }
  if (PrevValUpin == LOW && upPin == HIGH){
    Serial.print("UP");
    playcomplete("UP.wav");
    delay(1000);
  }
  PrevValDpin = downPin;
  PrevValUpin = upPin;
  delay(2);
}


// 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();
}