//initialize irq for audio write
void initialize_audio_irq()
{
printf("Initializing Audio IRQ...\n");
alt_up_audio_disable_read_interrupt(audio_dev);
alt_up_audio_disable_write_interrupt(audio_dev);
printf("Audio IRQ initialized...\n");
}
/* 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);
}
int set_audio_interrupt(alt_up_audio_dev *audio, volatile int edge_capture_thing)
{
// Need to disable both audio interrupts before setting them up
// otherwise you get stuck in them when they are setup
alt_up_audio_disable_read_interrupt(audio);
alt_up_audio_disable_write_interrupt(audio);
void *edge_pointer = (void*)&edge_capture_thing;
#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
return alt_ic_isr_register(AUDIO_CORE_IRQ_INTERRUPT_CONTROLLER_ID,
AUDIO_CORE_IRQ, playMusicISR, edge_pointer, 0x0);
#else
return alt_irq_register(AUDIO_CORE_IRQ, edge_pointer, playMusicISR);
#endif
}
int main(void) {
device_reference = alt_up_sd_card_open_dev("/dev/SD_Card");
if (device_reference != NULL) {
while(1) {
if ((connected == 0) && (alt_up_sd_card_is_Present())) {
printf("Card connected.\n");
if (alt_up_sd_card_is_FAT16()) {
printf("FAT16 file system detected.\n");
//Print out the list in the sd card
handler = alt_up_sd_card_find_first("", buffer_name);
printf("%s \n", buffer_name);
//Read a file in SD card -needs to speed up(10 sec?) - needs array of int
sd_fileh = alt_up_sd_card_fopen("TEST.WAV", false);
if (sd_fileh < 0)
printf("Problem reading file. Error %i\n", sd_fileh);
else
{
printf("Reading file...\n");
audio_dev = alt_up_audio_open_dev (AUDIO_NAME);
if ( audio_dev == NULL){
return;
}
av_config = alt_up_av_config_open_dev(AUDIO_AND_VIDEO_CONFIG_NAME);
while(!alt_up_av_config_read_ready(av_config));
alt_up_audio_disable_read_interrupt(audio_dev);
alt_up_audio_enable_write_interrupt(audio_dev);
/*
// Get information of number of channels
//count = 0;
char a, b;
int d;
short c;
int index = 0;
while (buffer_name[index] != "\0"){
a = alt_up_sd_card_read(sd_fileh);
b = alt_up_sd_card_read(sd_fileh);
c = ((unsigned char) a <<8) | (unsigned char) b;
d = c;
d = alt_up_audio_write_fifo(device_reference,d,)
index++;
}
*/
/*
// printf("NumChannels ");
byte1 = 0;byte2 = 0;total = 0;
byte1 = alt_up_sd_card_read(sd_fileh);
byte2 = alt_up_sd_card_read(sd_fileh);
total = (byte1 & 0x00ff) | (byte2 << 8);
NumChannels = total;
// printf("%d\n",total);
// printf("SampleRate ");
byte1 = 0;byte2 = 0;byte3 = 0;byte4 = 0;long_total = 0;
byte1 = alt_up_sd_card_read(sd_fileh);
byte2 = alt_up_sd_card_read(sd_fileh);
byte3 = alt_up_sd_card_read(sd_fileh);
byte4 = alt_up_sd_card_read(sd_fileh);
long_total = (byte4 << 24) | (byte3 << 16) | (byte2 << 8) | ( byte1 & 0x000000ff);
sampleRate = long_total;
// printf("%ld\n",long_total);
*/
/*
count = 0;
while (count < 16) // 44-byte header
{
alt_up_sd_card_read(sd_fileh);
count++;
}
*/
}
//find next file
while ((handler = alt_up_sd_card_find_next(buffer_name)) != -1)
printf("%s \n", buffer_name);
}else{
printf("Unknown file system.\n");
}
connected = 1;
} else if ((connected == 1) && (alt_up_sd_card_is_Present() == false)) {
printf("Card disconnected.\n");
connected = 0;
}
}
}
return 0;
}
