adccont.c

ADuC系列芯片的源代码事例

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

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

 Date          : Sept. 2005

 File          : ADCcont.c

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

 Description   : Performs 1024 continuous ADC conversions on ADC0,
				 store the results in SRAM and send them through UART
				 at 9600bps when the 1024 conversions are done
		
*********************************************************************/
#include <ADuC7026.h>

void senddata(short);
void ADCpoweron(int);
char hex2ascii(char);

int main (void)  {

	unsigned short ADCDATA[1024];
	int i;

	ADCpoweron(20000);					// power on ADC
												
 	ADCCP = 0x00;	  					// select ADC channel 0
	REFCON = 0x01;						// internal 2.5V reference. 2.5V on Vref pin

	GP0CON = 0x100000; 					// Enable ADCbusy on P0.5

 	// configures GPIO to flash LED P4.2
	GP4DAT = 0x04000000;				// P4.2 configured as an output. LED is turned on	

	// 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
	
	ADCCON = 0x4E4;						// Config: fADC/2, acq. time = 2 clocks => ADC Speed = 1MSPS

	while(1)
	{			// start continuous conversion	
		for (i=0; i <2; i++)
		{
			while (!ADCSTA){}			// wait for end of conversion
			ADCDATA[i] = (ADCDAT >> 16);
			if (ADCCP == 0)	ADCCP = 1;	// change channel
			else ADCCP = 0;
		}
		GP4DAT ^= 0x00040000;			// Complement P4.2
		for (i=0; i <1024; i++)	senddata (ADCDATA[i]);
	
		GP4DAT ^= 0x00040000;			// Complement P4.2
	}
}

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