// Program to generate Sine wave
// Program uses the support files from Chassaing's text book
#include "dsk6713_aic23.h" //codec-dsk support file
Uint32 fs=DSK6713_AIC23_FREQ_16KHZ; //set sampling rate
short sine_table[8] = {0,707,1000,707,0,-707,-1000,-707};
short gain = 10;
int i = 0;
interrupt void c_int11() //interrupt service routine
{
output_sample(gain*sine_table[i]);
i= i+1;
if(i >= 8)i=0;
return;
}
void main() // Main Program
{
comm_intr(); //init DSK,
codec, McBSP
while (1);
}
// ===============================
The function comm_intr() initializes
the DSK, AIC23 codec, and the McBSP (Multichannel Buffered Serial Ports)
on the DSK 6713 board.
The function comm_intr() also sets up interrupts such
that the AIC23 codec will sample the analog input signal and interrupt the C6713
processor, at the sampling frequency defined by the line 2 of the program.When the interrupt occurs at Ts =1/fs, the interrupt service routine executes and a value from the sine_table[i] is output to the LINE OUT of the DSK board
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