//ICC-MSP application builder [F149] : 11/24/2010 3:45:20 PM
//Target 16x device
#include <msp430x16x.h>
#include <msp430def.h>
#include <stdio.h>
#include <math.h> 

unsigned int M=32;
volatile unsigned long int adcvalue[32] = {0};
volatile unsigned long int data[32];
int i,j;
volatile unsigned int ready = 0;

void clock(void)
{
 
 volatile unsigned int ic;
 WDTCTL = WDTPW +WDTHOLD;                 	// Stop Watchdog Timer
  BCSCTL1 &= ~XT2OFF;
  do
  {
   IFG1 &= ~OFIFG;
   for(ic=0xFF;ic>0;ic--);
  } 
  while((IFG1 & OFIFG));         		   
  BCSCTL2 |=  SELM_2+SELS;  
} 

void port_init(void)
{
 P1OUT=0x00;
 P1DIR=0x00;
 P1IES=0x00;
 P1IE=0x00;
 P1SEL=0x00;
 P2OUT=0x00;
 P2DIR=0x00;
 P2IES=0x00;
 P2IE=0x00;
 P2SEL=0x00;
 P3OUT=0x00;
 P3DIR=0x00;
 P3SEL=0x00;
 P4OUT=0x00;
 P4DIR=0x00;
 P4SEL=0x00;
 P5OUT=0x10;
 P5DIR=0x10;
 P5SEL=0x10;
 P6OUT=0x00;
 P6DIR=0x00;
 P6SEL=0x00+BIT0;
}

void init_adc12 (void)
{
 ADC12CTL0=SHT0_7+ADC12ON+REFON+REF2_5V+MSC; // switch on reference voltage , ref=2.5
 ADC12CTL1=CONSEQ_3+SHS_0+ADC12SSEL_2+SHP; //repeated sequence of channels
 ADC12MCTL0=SREF_1+INCH_0+EOS;	 //Vr+=Vref+
 ADC12IE=0x01;
ADC12CTL0|=ENC
}
void init_timera(void)
{ 
  	
  	TACCTL0 = OUTMOD_3;			 // timer mode is  set/reset
    	TACCR0=0xD2;				 // timer ticks at 210
  	TACTL = TASSEL_2 + MC_1; 		 // SMCLK and Up mode
		
}
void usart0_init(void)
//Clock source=SMCLK
//Desired baud=19200
//Actual  baud=19196
{
 UCTL0=0x10;//CHAR0
 UTCTL0=0x20;//SSEL0.1
 URCTL0=0x08;//URXEIE0
 U0BR1=0x00;
 U0BR0=0xD0;
 UMCTL0=0xA2;
}
//interrupt handlers

//call this routine to initialise all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 DINT(); //disable all interrupts
 ME1=0X00; //disable sfr peripherals
 ME2=0X00; 
 IE1=0x00; //disable sfr interrupts
 IE2=0x00; 
 //watchdog initialisation including nmi function
 //WDTCTL=0x5A00 | 0x00;
 WDTCTL=0x5A00 | 0x10;//TMSEL
 //initialise other peripherals

 port_init();
 usart0_init();
 init_adc12();
 init_timera();
 clock();

 ME1=0x00;
 ME2=0x00;
 IE1=0x00;
 IE2=0x00;
 EINT(); //re-enable interrupts
}

//interrupt handlers 


#pragma interrupt_handler adc12_isr:ADC_VECTOR
void adc12_isr(void)
{

 static unsigned int x = 0;
ADC12CTL0|=ADC12SC+ENC;
 data[x++]=ADC12MEM0; 

  if (x==32) 
  {
    x= 0;
    ready = 1;
	
  }
}

void main(void)

{
 init_devices();
 sinewave();
 
 while(1)

{
	 while(!ready);
	 for(j=0;j<32;j++)
  	 adcvalue[j]+=data[j];// samples in M*32
	 ready=0;  
}

/*============================================================================*/
/*                                                                            */
/* ----------------------------- Signal generation   ------------------------ */
/*                                                                            */
/*============================================================================*/
static int Sin_tab[32] =
{
1843,
2202,
2548,
2867,
3145,
3375,
3545,
3650,
3686,
3650,
3545,
3375,
3146,
2867,
2548,
2202,
1843,
1483,
1138,
819,
540,
311,
140,
35,
0,
35,
140,
311,
540,
819,
1138,
1483
};

void sinewave(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 
  ADC12CTL0 = REFON+REF2_5V;					  		  				//Use 2.5V ADC reference                      
 
  DMA2SA = (int) Sin_tab;                   											//Initialize the DMA source address with the sine lookup table
  DMA2DA = (unsigned int)&DAC12_1DAT;        										//Initialize the DMA destination address with the DAC1 data register
  DMA2SZ = 0x20;                            											//Specify the DMA trasfer size (32)
  DMACTL0 = DMA2TSEL_2;												//Trigger for the DMA transfers (TimerB CCIFG flag)
  DMA2CTL = DMADT_4 + DMASRCINCR_3 + DMAEN; 								//Repeated single transfer,increment the source address & enable DMA
 
  DAC12_1CTL = DAC12LSEL_3 + DAC12IR + DAC12AMP_5 + DAC12IFG + DAC12ENC;		                      //DAC trigger with timerB rising edge & enable DAC
  
  TBCCTL2 = OUTMOD_3;							  			   			 //TimerB output-mode (set/reset)
  TBCCR2 =1;																			                                                      	
  TBCCR0 =0x1D;                           
  TBCTL = TBSSEL_2 + MC_1;   			  									  //Source SMCLK ,UP mode
}