void fifo_interrupt_handler() {
uint32_t i = 0;
while(i++ < MAX_FIFO_SAMPLES && !XAC97_isInFIFOFull(XPAR_AXI_AC97_0_BASEADDR)){
// uint32_t soundData = getCurrentSample();
uint32_t soundData = getMixedSample();
uint32_t sample = soundData | (soundData<<16); // Shifting to put in Left and Right
XAC97_mSetInFifoData(XPAR_AXI_AC97_0_BASEADDR, sample); // Writing to the FIFO
}
}
//helper function for audio
static void playSound(int* samples, int num_samples){
uint32_t stop = 0;
static uint32_t i = 0;
if(!readyForSound){
while(i < num_samples && stop != MAX_NUM_SAMPLES){
XAC97_mSetInFifoData(XPAR_AXI_AC97_0_BASEADDR, *(samples+i) << 16 | *(samples+i));
i++;
stop++;
}
}else{
while(stop != MAX_NUM_SAMPLES){
XAC97_mSetInFifoData(XPAR_AXI_AC97_0_BASEADDR, 0);
stop++;
}
return;
}
if(i == num_samples){
i = 0;
readyForSound = true;
num_samples = 0;
}
return;
}
void sound_writeToFifo(int count)
{
int i;
for(i = 0; i < count; i++)
{
// If there is no sound playing, push zeros into the queue.
uint16_t data = playingSound ? (128 + currentSound.soundData[currentSoundPosition]) : 0;
// Bits 0-15 are right channel, 16-31 are left channel. Our audio only has one channel, so we will use it for both channels.
XAC97_mSetInFifoData(XPAR_AXI_AC97_0_BASEADDR, (data | data << 16));
// Advance position
currentSoundPosition++;
if(currentSoundPosition >= currentSound.numberOfSamples)
playingSound = false;
}
}
