int alt_up_audio_write_fifo(alt_up_audio_dev *audio, unsigned int *buf, int len, int channel)
{
unsigned int fifospace;
int count = 0;
while ( count < len )
{
// read the whole fifospace register
fifospace = IORD_ALT_UP_AUDIO_FIFOSPACE(audio->base);
// extract the part for Left Channel Write Space
fifospace = (channel == ALT_UP_AUDIO_LEFT) ?
(fifospace & ALT_UP_AUDIO_FIFOSPACE_WSLC_MSK) >> ALT_UP_AUDIO_FIFOSPACE_WSLC_OFST :
(fifospace & ALT_UP_AUDIO_FIFOSPACE_WSRC_MSK) >> ALT_UP_AUDIO_FIFOSPACE_WSRC_OFST;
if (fifospace > 0)
{
if (channel == ALT_UP_AUDIO_LEFT)
IOWR_ALT_UP_AUDIO_LEFTDATA(audio->base, buf[count++]);
else
IOWR_ALT_UP_AUDIO_RIGHTDATA(audio->base, buf[count++]);
}
else
{
// no more space to write
break;
}
}
return count;
}
void alt_up_audio_write_fifo_head(alt_up_audio_dev *audio, unsigned int data, int channel)
{
if (channel == ALT_UP_AUDIO_LEFT)
IOWR_ALT_UP_AUDIO_LEFTDATA(audio->base, data);
else
IOWR_ALT_UP_AUDIO_RIGHTDATA(audio->base, data);
}
/* The audio task is responsible for continuously playing music
* off the SD card.
*/
void audio_task(void *pdata) {
int err = 0;
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_ACTIVE_CTRL, 0x00);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_LEFT_LINE_IN, 0x97);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_RIGHT_LINE_IN, 0x97);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_LEFT_HEADPHONE_OUT, 0x79);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_RIGHT_HEADPHONE_OUT, 0x79);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_ANALOG_AUDIO_PATH_CTRL, 0x12);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_DIGITAL_AUDIO_PATH_CTRL, 0x05);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_POWER_DOWN_CTRL, 0x07);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_AUDIO_DIGITAL_INTERFACE, 0x42);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_SAMPLING_CTRL, 0x22);
err += alt_up_av_config_write_audio_cfg_register(av_dev, AUDIO_REG_ACTIVE_CTRL, 0x01);
err += audio_set_headphone_volume(av_dev, DEFAULT_VOLUME);
if(err < 0)
printf("Audio Configuration Failed\n");
alt_up_audio_reset_audio_core(audio_dev);
alt_up_audio_disable_read_interrupt(audio_dev);
alt_up_audio_disable_write_interrupt(audio_dev);
char fileName[10] = {"class.wav\0"};
if (file_fopen(&readFile, &efsl.myFs, fileName, 'r') != 0)
printf("Error:\tCould not open file\n");
int readSize = 0;
euint32 currentSize = 44;
euint8 buf[AUDIO_BUF_SIZE];
int i;
/* The task is suspended so that it can be played by another task. */
OSTaskSuspend(AUDIO_TASK_PRIORITY);
while(1) {
if (currentSize < readFile.FileSize) {
int fifospace = alt_up_audio_write_fifo_space(audio_dev, ALT_UP_AUDIO_LEFT);
if (fifospace > WORD_COUNT) {
readSize = file_fread(&readFile, currentSize, AUDIO_BUF_SIZE, buf);
currentSize += readSize;
i = 0;
while(i < AUDIO_BUF_SIZE) {
IOWR_ALT_UP_AUDIO_LEFTDATA(audio_dev->base, (buf[i+1]<<8)|buf[i]);
IOWR_ALT_UP_AUDIO_RIGHTDATA(audio_dev->base, (buf[i+3]<<8)|buf[i+2]);
i+=4;
}
}
} else {
currentSize = 44;
}
}
file_fclose(&readFile);
}
