Audio IP Core Help

Altera_Forum · ‎11-17-2009

I am in the process of attempting to use the Audio IP Core to take input from the Mic, and then output it the Line out.

I have created a system in the SOPC builder with the following components:

cpu_0

onchip_memory2_0

PIO(Input)

PIO(Output)

audio_and_video_config_0

audio_0

For the audio_and_video_config_0, I've set it to initialize both Audio and Video. I've set the In path to Microphone to ADC, and Out to enable DAC.

This will build without error.

I have the following C application to run on this system just to verify the Audio I/O is working.

# include <system.h># include <altera_up_avalon_audio.h>

# define Switches (volatile char *) SWITCHES_BASE# define LEDs (char *) LEDS_BASE

# define BUFFER_SIZE 512

void increaseGain(unsigned int *buffer, unsigned length);

int main()

{

alt_up_audio_dev * audioDev = 0;

unsigned int buffer[BUFFER_SIZE];

unsigned length = (BUFFER_SIZE/2);

int readData = 0;

//Open the Audio device

audioDev = alt_up_audio_open_dev(AUDIO_0_NAME);

//reset the Audio Device

alt_up_audio_reset_audio_core(audioDev);

while (1)

{

*LEDs = *Switches;

readData = alt_up_audio_read_fifo(audioDev, buffer, length, ALT_UP_AUDIO_LEFT);

alt_up_audio_write_fifo(audioDev, buffer, readData, ALT_UP_AUDIO_LEFT);

readData = alt_up_audio_read_fifo(audioDev, buffer, length, ALT_UP_AUDIO_RIGHT);

alt_up_audio_write_fifo(audioDev, buffer, readData, ALT_UP_AUDIO_RIGHT);

}

return 0;

}

Right now when I download my image, the mic in, is automatically playing out the Line out, however it's very quiet and distorted.

Any assistance is appreciated.

Altera_Forum · ‎12-23-2009

hi!

i m sorry i cannot answer your question, but can i thinku can help me as i m working on a similar project...

where should i copy the header file to avoid the long include statement like "c:\dir1\dir2\include\altera_up_avalon_audio.h"

or is it possible to do the same in NIOS2 IDE somehow?