audio_lab_accelerator.c

/*
I don't really know why but this didn't work for me, the program always got stuck in the while loop of the I2SFifoRead function.
Even with sound coming, with waiting that we have at least 99 values in the FIFO, with using variables instead of
directly putting the reading of one FIFO in the writing of another

I don't know why it's not working but I'm submitting my code nevertheless, maybe something was wrong with my installation / compilation chain

*/

void I2SFifoWrite (u32 i2sBaseAddr, u32 audioData)
{

	Xil_Out32(i2sBaseAddr + 0x10, audioData); // write DATA
    Xil_Out32(i2sBaseAddr + 0x14, 4);    // write the length of the DATA (4 bytes)

	//xil_printf("%x\n", Xil_In32(i2sBaseAddr + 0x00));
	while ((Xil_In32(i2sBaseAddr + 0x00)&0x08000000)!=0x08000000){;}  // waits for the transmission completes
	Xil_Out32(i2sBaseAddr + 0x00, 0x08000000);  // ack the transmission complete


}


u32 I2SFifoRead (u32 i2sBaseAddr)
{
	while (Xil_In32(i2sBaseAddr + 0x1C)==0){;} // waits for a sample in the FIFO
	int data = Xil_In32(i2sBaseAddr + 0x20);   // read the sample from the FIFO

	return data;

}


int main()
{

	init_platform();

	print("Started!\n\r");

	AudioInitialize(SCU_TIMER_ID, AUDIO_IIC_ID, AUDIO_CTRL_BASEADDR);

	initialize_FIFO(AUDIO_FIFO);
	initialize_FIFO(FIR_FIFO);


	int j=0;
	int time_now=0;
	int time_func = 0;
	int t = 0;


	while (1){

		if(j%2==0){
			t = Xil_In32(GLOBAL_TMR_BASEADDR + GTIMER_COUNTER_LOWER_OFFSET) - time_now;
		}



		time_now = Xil_In32(GLOBAL_TMR_BASEADDR + GTIMER_COUNTER_LOWER_OFFSET);


		// Left sample
		I2SFifoWrite(FIR_FIFO, I2SFifoRead(AUDIO_FIFO));

		if(j>=99){
			I2SFifoWrite(AUDIO_FIFO, I2SFifoRead(FIR_FIFO));
		}
    /////////////////
    

		// Right sample
		I2SFifoWrite(FIR_FIFO, I2SFifoRead(AUDIO_FIFO));

		if(j>=99){
			I2SFifoWrite(AUDIO_FIFO, I2SFifoRead(FIR_FIFO));
		}
    /////////////////


		time_func = Xil_In32(GLOBAL_TMR_BASEADDR + GTIMER_COUNTER_LOWER_OFFSET) - time_now;



		if(j%100000 == 0){
			xil_printf("Filter : %d, Loop : %d\n",time_func, t);
			j = 0;
		}

		j++;

	}

	cleanup_platform();
	return 0;
}