/************************
 *  Willaim Jones		*
 *	525.446				*
 *	Lab 2 source code 	*
 *	DSP_DDS.c  			*
 ************************/

#include "DSK6713_AIC23.h"
#include <stdio.h>	//using printfs for debug
#include <math.h>	//used for sin()
Uint32 fs=DSK6713_AIC23_FREQ_48KHZ;  //set sampling freq to 48 kHz
#define DSK6713_AIC23_INPUT_MIC 0x0015
#define DSK6713_AIC23_INPUT_LINE 0x0011
Uint32 inputsource=DSK6713_AIC23_INPUT_LINE;  //default input line

/*******************************************************
 Phase increment determined by:  
 (2^N)*f0/f_s 
 where N=32, f_s is sampling freq., and f0 is desired freq. out (rounded to integer)
*******************************************************/

#define phase_inc0 9847849		//phase increment for 100 Hz
#define phase_inc1 268435456	//phase increment for 3000 Hz
#define phase_inc2 39370534		//phase increment for 440 Hz
#define phase_inc3 39415273		//phase increment for 330.5 Hz

Uint32 phase_acc=4275271597;	//register for phase accumulator

#define LUT_length 512			//sine LUT size = 2^9
Uint32 LUT_index=0;			//index for LUT
short sine_LUT[LUT_length];	//sine look-up-table
short sine_LUTtest[8]={0,707,1000,707,0,-707,-1000,-707};	//sine look-up-table test
short loopindex=0;
short gain=10;				//gain to codec
short temp_sample=0;		//temp variable for storing output sample

#define pi 3.1415927

main()
{
//	printf("sampling freq = %d\n", f_s);
	comm_poll();		//init DSK, codec, McBSP
	DSK6713_LED_init();	//init LEDs from BSL
	DSK6713_DIP_init();	//init DIPs from BSL

	
	while(1)
	{
		if(DSK6713_DIP_get(0) == 1 && DSK6713_DIP_get(1) == 1) //neither DIPs are pressed
		{	//freq. out = 100 Hz;
			phase_acc+=phase_inc0;
			
			LUT_index=((phase_acc & 0xFF800000)/(2^(32-9)));	//round and bit-shift for LUT index

			if(DSK6713_DIP_get(3) == 1) //DIP 3 not pressed, use LUT
			{
				temp_sample=0;
			}
			else	//use sine function
			{
				output_sample(gain*sine_LUTtest[loopindex++]);
				if(loopindex>=8) loopindex=0;
			}			
	//		output_left_sample(temp_sample);
			//set LEDs
			DSK6713_LED_on(0);
			DSK6713_LED_off(1);
			DSK6713_LED_off(2);
			DSK6713_LED_off(3);
		} 	//end if
		else if(DSK6713_DIP_get(0) == 0 && DSK6713_DIP_get(1) == 1)	//DIP 0 pressed
		{	//freq. out = 3000 Hz
			phase_acc+=phase_inc1;

			//set LEDs
			DSK6713_LED_off(0);
			DSK6713_LED_on(1);
			DSK6713_LED_off(2);
			DSK6713_LED_off(3);
		}	//end if
		else if(DSK6713_DIP_get(0) == 1 && DSK6713_DIP_get(1) == 0)	//DIP 1 pressed
		{	//freq. out = 440 Hz
			phase_acc+=phase_inc2;

			//set LEDs
			DSK6713_LED_off(0);
			DSK6713_LED_off(1);
			DSK6713_LED_on(2);
			DSK6713_LED_off(3);
		}	//end if
		else if(DSK6713_DIP_get(0) == 0 && DSK6713_DIP_get(1) == 0)	//DIP 0 and 1 pressed
		{	//freq. out = 440.5 Hz
			phase_acc+=phase_inc3;

			//set LEDs
			DSK6713_LED_off(0);
			DSK6713_LED_off(1);
			DSK6713_LED_on(2);
			DSK6713_LED_off(3);
		}	//end if


	//	output_left_sample(temp_sample);

	}	//end while

} //end main