Ok. So, a round of heavy googling brought me to Ladyada's Project Page Overview | Wave Shield | Adafruit Learning System on which she basically describes how to build/use almost the exact circuit I am aiming for. The only difference is that, in addition to accessing specific wave files associated with one of 6 respective buttons from an sd card, I also would like each button to trigger an LED to light up for as long as the associated wave file is playing.
My first question is where I should/shouldn't plug the buttons and LEDs into on the wave shield...
IMAGE
http://www.adafruit.com/index.php?main_page=popup_image_additional&pID=94&pic=3&products_image_large_additional=images/large/94top_LRG.jpg
... and my second question is how to add the locations of the LEDs and buttons, as well as how to use them, without messing up this beautiful piece of code that runs the arduino & shield as-is?
#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[] = {14, 15, 16, 17, 18, 19};
// 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("DO.WAV");
}
else if (justpressed[1]) {
justpressed[1] = 0;
playfile("RE.WAV");
}
else if (justpressed[2]) {
justpressed[2] = 0;
playfile("MI.WAV");
}
else if (justpressed[3]) {
justpressed[3] = 0;
playfile("FA.WAV");
}
else if (justpressed[4]) {
justpressed[4] = 0;
playfile("SO.WAV");
}
else if (justpressed[5]) {
justpressed[5] = 0;
playfile("LA.WAV");
}
}
// 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 know I have bitten off more than I can chew right now, but I really do learn fastest by jumping into the deep end and asking for input when I'm well and truly stumped. Thank you again for helping me with this!
