int main()
{
int main(void)
{
alt_up_audio_dev * audio_dev;
/* used for audio record/playback */
unsigned int l_buf;
unsigned int r_buf;
// open the Audio port
audio_dev = alt_up_audio_open_dev ("/dev/Audio");
if ( audio_dev == NULL)
alt_printf ("Error: could not open audio device \n");
else
alt_printf ("Opened audio device \n");
/* read and echo audio data */
while(1)
{
int fifospace = alt_up_audio_read_fifo_avail (audio_dev, ALT_UP_AUDIO_RIGHT);
if ( fifospace > 0 ) // check if data is available
{
// read audio buffer
alt_up_audio_read_fifo (audio_dev, &(r_buf), 1, ALT_UP_AUDIO_RIGHT);
alt_up_audio_read_fifo (audio_dev, &(l_buf), 1, ALT_UP_AUDIO_LEFT);
// write audio buffer
alt_up_audio_write_fifo (audio_dev, &(r_buf), 1, ALT_UP_AUDIO_RIGHT);
alt_up_audio_write_fifo (audio_dev, &(l_buf), 1, ALT_UP_AUDIO_LEFT);
}
}
}
/* Checks if the read FIFO for the left channel has at least BUF_THRESHOLD data words
* available. If it doesn't, then just returns 0. If it does, then data is read from the
* FIFO up to a maximum of len words, and stored into buf.
*/
unsigned int alt_up_audio_record_l(alt_up_audio_dev *audio, unsigned int *buf, int len)
{
unsigned int data_words = alt_up_audio_read_fifo_avail (audio, ALT_UP_AUDIO_LEFT);
if (data_words <= BUF_THRESHOLD)
return 0;
else
return (alt_up_audio_read_fifo(audio, buf, len, ALT_UP_AUDIO_LEFT));
}
void audioSampling(void)
{
int fifospaceR,fifospaceL;
U32 ptrIndexL=0,ptrIndexR=0;
while(ptrIndexL<AUDIO_SAMPLING_MAX_DATA||ptrIndexR<AUDIO_SAMPLING_MAX_DATA)
{
fifospaceL=alt_up_audio_read_fifo_avail(audio_dev,ALT_UP_AUDIO_LEFT);
if(fifospaceL>100&&ptrIndexL<AUDIO_SAMPLING_MAX_DATA)
{
alt_up_audio_read_fifo(audio_dev,&audioSamplingLData[ptrIndexL],100, ALT_UP_AUDIO_LEFT);
ptrIndexL+=100;
}
fifospaceR=alt_up_audio_read_fifo_avail(audio_dev,ALT_UP_AUDIO_RIGHT);
if(fifospaceR>100&&ptrIndexR<AUDIO_SAMPLING_MAX_DATA)
{
alt_up_audio_read_fifo(audio_dev,&audioSamplingRData[ptrIndexR],100, ALT_UP_AUDIO_RIGHT);
ptrIndexR+=100;
}
}
}
