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#include<dsk6713.h>

#include<dsk6713_aic23.h>

#define BUF_SIZE 8000
voidmain()
{
Uint32sample_pair; // both channels packed in 32-bits
shorti = 0, left, buffer[BUF_SIZE] = { 0 }, delayed, output;
DSK6713_init();
DSK6713_AIC23_Configconfig = DSK6713_AIC23_DEFAULTCONFIG;
DSK6713_AIC23_CodecHandlehCodec;
hCodec = DSK6713_AIC23_openCodec(0, &config);
DSK6713_AIC23_setFreq(hCodec, DSK6713_AIC23_FREQ_8KHZ);
while (1)
{
while(!DSK6713_AIC23_read(hCodec, &sample_pair))
;
//extract left sample and put in 16-bits
left = (int)sample_pair>> 16; // 
delayed = buffer[i]; //read oldest sample
output = left + delayed; //output sum of new and delayed
buffer[i] = left; //replace oldest sample with input 
//increment i to point to the oldest sample
if (++i>= BUF_SIZE) 
i = 0;
//put 16-bit sample in top-half
sample_pair = (int)output << 16; 
while(!DSK6713_AIC23_write(hCodec, sample_pair))
;
}
}