dacsineclk.c

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/********************************************************************

 Author        : ADI - Apps            www.analog.com/MicroConverter

 Date          : Sept. 2005

 File          : DACsineClk.c

 Hardware      : Applicable to ADuC702x rev H or I silicon
                 Currently targetting ADuC7026.

 Description   : DAC outputs an intermittent Sine Wave on pin 10 (DAC1).
 				 S1.8 must be off
 				 To increase the approximation of a Sine Wave reduce 
				 T1Delay.

********************************************************************/

#include<ADuC7026.h>

void My_IRQ_Function();

 // Table is placed in Flash/EE
const static unsigned short TableS[64] = {
 	0x07FF, 0x08C8, 0x098E, 0x0A51, 0x0B0F, 0x0BC4, 0x0C71, 0x0D12,
 	0x0DA7, 0x0E2E, 0x0EA5, 0x0F0D, 0x0F63, 0x0FA6, 0x0FD7, 0x0FF5,
 	0x0FFF, 0x0FF5, 0x0FD7, 0x0FA6, 0x0F63, 0x0F0D, 0x0EA5, 0x0E2E,
 	0x0DA7, 0x0D12, 0x0C71, 0x0BC4, 0x0B0F, 0x0A51, 0x098E, 0x08C8,
 	0x07FF, 0x0736, 0x0670, 0x05AD, 0x04EF, 0x043A, 0x038D, 0x02EC,
 	0x0257, 0x01D0, 0x0159, 0x00F1, 0x009B, 0x0058, 0x0027, 0x0009,
 	0x0000, 0x0009, 0x0027, 0x0058, 0x009B, 0x00F1, 0x0159, 0x01D0,
 	0x0257, 0x02EC, 0x038D, 0x043A, 0x04EF, 0x05AD, 0x0670, 0x0736  
	};

int   i = 0;


int main (void)  {
	
	unsigned long T1Delay = 0x4000;

	IRQEN = 0x08;

	IRQ = My_IRQ_Function;

	// DAC configuration
	DAC1CON = 0x33;				// DAC configuration
								// range AVdd/AGND and Clocked
	DAC1DAT = 0x08000000;		// start from midscale

	// timer 1 configuration
	T1LD = T1Delay;						 
	T1CON = 0xC4;	 		// Enable Timer, Periodic and Core CLK / 16

	while(1)
	{       	
	}
	return (0);
}


void My_IRQ_Function()
{
   		DAC1DAT = (TableS[i] << 16);  
		i++;
		i &= 0x03f; 
		T1CLRI = 0x01;		// Clearing Timer 1 Interupt
}