/*
 * includes
 */
#include "dsk6713.h"
#include "dsk6713_aic23.h"
#include "dsk6713_dip.h"		// for reading off switches


/*
 * Codec configuration settings
 */
DSK6713_AIC23_Config config = {
		0x0017, // 0 DSK6713_AIC23_LEFTINVOL  Left line input channel volume
		0x0017, // 1 DSK6713_AIC23_RIGHTINVOL Right line input channel volume
		0x0100, // 2 DSK6713_AIC23_LEFTHPVOL  Left channel headphone volume
		0x0100, // 3 DSK6713_AIC23_RIGHTHPVOL Right channel headphone volume
		0x0011, // 4 DSK6713_AIC23_ANAPATH    Analog audio path control
		0x0000, // 5 DSK6713_AIC23_DIGPATH    Digital audio path control
		0x0000, // 6 DSK6713_AIC23_POWERDOWN  Power down control
		0x0043, // 7 DSK6713_AIC23_DIGIF      Digital audio interface format
		0x0001, // 8 DSK6713_AIC23_SAMPLERATE Sample rate control 48kHz
		0x0001  // 9 DSK6713_AIC23_DIGACT     Digital interface activation
};



#define SR 48000


Int16 get_sine(Uint32 freq, Uint32 sample, Uint32 sample_rate)
{
	double t = sample_rate/freq;
	double x = sample/t;
	double y = sin(x);

	return (Int16)(y * 20000);
}

void main()
{
	// variable declarations
	DSK6713_AIC23_CodecHandle hCodec;	// handle to the codec

	// user defined variables
	Uint32 val;
	Uint32 s = 0;

	/* Initialize the board support library, must be called first */
	DSK6713_init();
	DSK6713_DIP_init();


	/* Start the codec */
	hCodec = DSK6713_AIC23_openCodec(0, &config);


	while(1)
	{
		int l, r;

		val = get_sine(30000, s, SR);
		s = ++s % SR;

		while(!DSK6713_AIC23_read(hCodec, &val));

		l = (val & 0xFFFF0000) >> 16;
		r = (val & 0x0000FFFF);

		val *= l;

		/* LPF */

		DSK6713_AIC23_write(hCodec, val);
	}

	/* Close the codec */
	DSK6713_AIC23_closeCodec(hCodec);

}