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

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

 Date          : Sept. 2005

 File          : ADCtimer.c

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

 Description   : Performs an ADC conversion every 100 us using timer0  
 				 overflow alternatively on Channel 0 and 1
 				 sending the results through UART at 9600bps
		
*********************************************************************/

#include <ADuC7026.h>				// 	Include ADuC7026 Header File

void My_IRQ_Function(void);			//	IRQ Funtion Prototype 
void senddata(short to_send);
void ADCpoweron(int);
char hex2ascii(char toconv);
void delay(int);

									
int main (void)  {

	//ADC configuration
	ADCpoweron(20000);				// power on ADC										
	ADCCP  = 0x00;
	ADCCON = 0x4E2;					// start conversion on timer 0
									// ADC Config: fADC/2, acq. time = 2 clocks => ADC Speed = 1MSPS					
	
	REFCON = 0x01;					// connect internal 2.5V reference to VREF pin
	

	// Setup tx & rx pins on P1.0 and P1.1
	GP1CON = 0x011;
 
   // Start setting up UART at 9600bps
	COMCON0 = 0x80;					// Setting DLAB
	COMDIV0 = 0x88;			
   	COMDIV1 = 0x00;
   	COMCON0 = 0x07;					// Clearing DLAB


	// for test purposes only
	GP0CON = 0x10100000; 			// enable ECLK output on P0.7, and ADCbusy on P0.5

	IRQ = My_IRQ_Function;			// 	Specify Interrupt Service Rountine 

	IRQEN = ADC_BIT;				//	Enable ADC IRQ ( 0x80 )
	
	// timer0 configuration
	T0LD = 0x1000;					// 4096/40.96MHz = 100us
	T0CON = 0xC0;					// count down
									// periodic mode

	GP4DAT = 0x04000000;			//	Configure P4.2 as output

	while(1)
	{
	}
                   
	return 0 ;
}


/********************************************************************/
/*                                                                  */
/*		Interrupt Service Rountine									*/
/*                                                                  */
/********************************************************************/

void My_IRQ_Function()				
{		
	GP4DAT ^= 0x00040000;			// Complement P4.2
	ADCCP ^= 1;						// change channel
	senddata (ADCDAT >> 16);	
	return ;
}

void senddata(short to_send)
{
	while(!(0x020==(COMSTA0 & 0x020))){}
		COMTX = 0x0A;						// output LF 
	while(!(0x020==(COMSTA0 & 0x020))){}
		COMTX = 0x0D;						// output CR 
	while(!(0x020==(COMSTA0 & 0x020))){}
		COMTX = hex2ascii ((to_send >> 8) & 0x0F);
	while(!(0x020==(COMSTA0 & 0x020))){}
		COMTX = hex2ascii ((to_send >> 4) & 0x0F);						
	while(!(0x020==(COMSTA0 & 0x020))){}
		COMTX = hex2ascii (to_send & 0x0F);							
}


char hex2ascii(char toconv)
{
	if (toconv<0x0A) 
	{
		toconv += 0x30;
	}
	else 
	{
		toconv += 0x37;
	}
	
	return (toconv);
}

void delay (int length)
{
while (length >=0)
    length--;
}

void ADCpoweron(int time)
{
	ADCCON = 0x20;	 					// power-on the ADC
	while (time >=0)	  				// wait for ADC to be fully powered on
    time--;
}