int build_file_index(data_file files[]){
int i = 0;
if (!search_for_filetype("WAV", &files[i++], 0, 1) && !search_for_filetype("WAV", &files[i++], 0, 1)){
while(file_number > 1 && !search_for_filetype("WAV", &files[i++], 0, 1));
}
return i-1;
}
void init_music(){
int clusterLength, secCount;
search_for_filetype("WAV", &returnData,0,1);
printLCD(returnData.Name, "Buffering...");
clusterLength = 1+ ceil( (float) returnData.FileSize / bytePerCluster);
build_cluster_chain(cc, clusterLength, &returnData);
play_type = IORD(SWITCH_PIO_BASE, 0) & 0x07;
LCD_Display(returnData.Name, play_type);
}
//This is used to set up the buttons to do their required roles.
static void button_ISR(void* context, alt_u32 id)
{
//Listen to ISR on a specific edge, so that we don't receive 2 interrupts at once
if(_isredge == 0){
alt_u8 btnPressed = IORD(BUTTON_PIO_BASE, 3) & 0xf;
switch(btnPressed){
//Set playing flag to default value and update the status to LCD
case BTN_STOP:
_playing = 0;
IOWR(BUTTON_PIO_BASE, 2, 0xf);
DisplayStatusLCD();
break;
//Set play flag to high and let while loop handle audio play (disable other buttons)
case BTN_PLAY:
_playing = 1;
IOWR(BUTTON_PIO_BASE, 2, 0xf);
break;
case BTN_NEXT:
if(search_for_filetype("WAV", &_fileinfo, 0, 1) == 0)
DisplayStatusLCD();
break;
case BTN_PREV:
//Prevent file iterator from getting stuck on the first file when going previous
if(file_number < 0)
file_number = 0;
else
file_number = file_number - 2;
if(search_for_filetype("WAV", &_fileinfo, 0, 1) == 0)
DisplayStatusLCD();
break;
}
_isredge = 1;
}else{
_isredge = 0;
}
IOWR(BUTTON_PIO_BASE, 3, 0x0);
}
int main()
{
alt_u8 _prevswstate = 0x0;
Setup();
//Set up the initial file on SD card
search_for_filetype("WAV", &_fileinfo, 0, 1);
_swstate = IORD(SWITCH_PIO_BASE, 0);
_prevswstate = 8;
while(1)
{
//Listen for any changes in the switches, update if so
_swstate = IORD(SWITCH_PIO_BASE, 0);
if(_swstate != _prevswstate){
DisplayStatusLCD();
_prevswstate = _swstate & 0x07;
}
if (_playing == 1)
{
DisplayStatusLCD();
printf("Playing audio file: %s\n", _fileinfo.Name);
//Disable other buttons
IOWR(BUTTON_PIO_BASE, 2, 0x01);
//Initialise cluster chain and build it from the audio file
int clusterChain[100000];
int tracklength = 1 + ceil(_fileinfo.FileSize/(BPB_BytsPerSec*BPB_SecPerClus));
LCD_File_Buffering(_fileinfo.Name);
build_cluster_chain(clusterChain, tracklength, &_fileinfo);
//Update LCD and play audio dependent on user-selected mode
DisplayStatusLCD();
switch(_swstate){
case SW_NORMALPLAY:
NormalPlay(_fileinfo, tracklength, clusterChain);
break;
case SW_DOUBLEPLAY:
DoublePlay(_fileinfo, tracklength, clusterChain);
break;
case SW_HALFPLAY:
HalfPlay(_fileinfo, tracklength, clusterChain);
break;
case SW_DELAYPLAY:
DelayPlay(_fileinfo, tracklength, clusterChain);
break;
case SW_REVERSEPLAY:
ReversePlay(_fileinfo, tracklength, clusterChain);
break;
default:
NormalPlay(_fileinfo, tracklength, clusterChain);
break;
}
//Enable buttons, and reset play flag
IOWR(BUTTON_PIO_BASE, 2, 0xf);
_playing = 0;
}
}
return 0;
}
