// This function writes data to the XAC97.
void fifo_writer(int* array, int frameNums){
int diff;
if (indexInArray == 0){ // This means that the function will begin playing a new sound
pointInArray = array; // The pointInArray iterator is set to the beginning of the sound array
setSwitchContext(false); // Disable the ability to assign new sound flags
}
if (indexInArray + XAC97_FIFO_BUFFER_SIZE >= frameNums){ // This means we've reached the end of a sound data array
diff = indexInArray + XAC97_FIFO_BUFFER_SIZE - frameNums; // This is the number of array locations to the end of the array
XAC97_PlayAudio(XPAR_AXI_AC97_0_BASEADDR, pointInArray, pointInArray+diff); // Play the audio
pointInArray = array; // Reset the point in the array
indexInArray = 0; // Reset the index in the array
setSwitchContext(true); // Allow other sound flags to be set
clearAllSounds(); // Clear all sounds (except for the saucerHighPitch)
XAC97_ClearFifos(XPAR_AXI_AC97_0_BASEADDR); // Clear the FIFO of all data
XAC97_mSetControl(XPAR_AXI_AC97_0_BASEADDR, AC97_ENABLE_IN_FIFO_INTERRUPT); // Re-enable interrupts
} else {
XAC97_PlayAudio(XPAR_AXI_AC97_0_BASEADDR, pointInArray, pointInArray+XAC97_FIFO_BUFFER_SIZE);// This means we're in the middle of a sound data array
pointInArray += XAC97_FIFO_BUFFER_SIZE; // Increment the pointInArray by how much was written to FIFO
indexInArray += XAC97_FIFO_BUFFER_SIZE; // Increment the indexInArray by how much was written to FIFO
}
}
int main() {
init_platform();
print("Hello World\n\r");
// apparently we don't need to init it, just HardReset
XAC97_HardReset(XPAR_AXI_AC97_0_BASEADDR);
XAC97_WriteReg(XPAR_AXI_AC97_0_BASEADDR, AC97_ExtendedAudioStat, 1);
XAC97_WriteReg(XPAR_AXI_AC97_0_BASEADDR, AC97_PCM_DAC_Rate, AC97_PCM_RATE_11025_HZ);
while (1) {
XAC97_PlayAudio(XPAR_AXI_AC97_0_BASEADDR, tankFireSound, &tankFireSound[tankFireSoundFrames]);
XAC97_Delay(1000000);
}
cleanup_platform();
return 0;
}
