/********************************** Main routine ************************************/
void main()
{
// initialize board and the audio port
init_hardware();
sine_init();
// Loop endlessley generating a sine wave
while(1)
{
// Calculate next sample
sample = sinegen();
/* Send a sample to the audio port if it is ready to transmit.
Note: DSK6713_AIC23_write() returns false if the port if is not ready */
// send to LEFT channel (poll until ready)
while (!DSK6713_AIC23_write(H_Codec, ((Int32)(sample * L_Gain))))
{};
// send same sample to RIGHT channel (poll until ready)
while (!DSK6713_AIC23_write(H_Codec, ((Int32)(sample * R_Gain))))
{};
// Set the sampling frequency. This function updates the frequency only if it
// has changed. Frequency set must be one of the supported sampling freq.
set_samp_freq(&sampling_freq, Config, &H_Codec);
}
}
/* The cosOut outputs a cosine of frequency "freq" for "duration" seconds
* to the codec with handle "hCodec"
* This is basically a utility function that busy-waits while generating
* and outputting a cosine wave */
void cosOut(double freq, double duration, DSK6713_AIC23_CodecHandle hCodec){
double i; int sample;
for (i = SAMPLE_PERIOD; i < duration; i+=SAMPLE_PERIOD){
sample = (int)(2048.0*cos(2*PI*freq*i));
// Send a sample to the left channel
while (!DSK6713_AIC23_write(hCodec, sample ));
//Send a sample to the right channel
while (!DSK6713_AIC23_write(hCodec, sample ));
}
return;
}
/**
* outputs the left and right channel then sets the output ready flag
*/
void transmit_interrupt(void) {
if(out_channel_flag){
DSK6713_AIC23_write(hCodec, out_left & 0xFFFF);
out_channel_flag = 0;
output_ready = 1;
} else {
DSK6713_AIC23_write(hCodec, out_right & 0xFFFF);
out_channel_flag = 1;
output_ready = 1;
}
}
/**
* main method
* contains main run loop
*/
int main() {
//prototype for linear assembly convolution function
extern int convolve_as_func(int x[], int w[], int x_idx, int w_length);
DSK6713_init();
hCodec = DSK6713_AIC23_openCodec(0,&config);
DSK6713_AIC23_setFreq(hCodec, DSK6713_AIC23_FREQ_8KHZ);
// enable interrupts
IRQ_globalEnable();
IRQ_enable(IRQ_EVT_RINT1);
IRQ_enable(IRQ_EVT_XINT1);
reset(); // init the input buffer to zeros
// get the time to make a clock() funciton call; used only for profiling
/*
start = clock();
end = clock();
diff = end - start;
*/
// the first write is needed to trigger the transmit interrupt
while(!DSK6713_AIC23_write(hCodec, 0));
in_channel_flag = 1;
out_channel_flag = 1;
while(1) {
if(input_ready) {
//process sample when input is ready
sig_error = process_sample(in_left, in_right);
input_ready = 0;
}
// set output when ready
if(output_ready) {
out_left = in_left;
out_right = sig_error;
output_ready = 0;
}
};
/* The program will never exit this loop */
/* However, if you _do_ exit the loop (say, using a break
* statement) close the D/A converter properly */
DSK6713_AIC23_closeCodec(hCodec);
exit();
}
void codec_write(int32 output_data){
while(!(DSK6713_AIC23_write(manejador,output_data)));
}
