ADC

综述

STC12C5A60S2具有10位ADC，8通道。

ADC转换结构图

涉及寄存器

P1ASF

ADC_CONTR

例子

AD.h

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#ifndef __AD_H
#define __AD_H


#include <reg52.h>
#include <intrins.h>

sfr P1ASF = 0x9d;
sfr ADC_CONTR = 0xbc;
sfr ADC_RES = 0xbd;
sfr ADC_LOW2 = 0xbe;
sfr AUXR1 =0xa2;


#define ADC_POWER  0x80
#define ADC_FLAG   0x10
#define ADC_START  0x08
#define ADC_SPEEDLL 0x00
#define ADC_SPEEDL 0x20
#define ADC_SPEEDH 0x40
#define ADC_SPEEDHH 0x60 


void delay1ms(void);
void delay1s(void);  
void AD_Init();
void AD_Get();

#endif

AD.c

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#include <AD.h>

void delay1ms(void)   
{
    unsigned char a,b;
    for(b=21;b>0;b--)
        for(a=130;a>0;a--);
    _nop_();  
}

void delay1s(void)  
{
    unsigned char a,b,c;
    for(c=217;c>0;c--)
        for(b=171;b>0;b--)
            for(a=73;a>0;a--);
}

void AD_Init()
{
	P1ASF = 0x01;		//enbale P10 Analog
	
	ADC_RES = 0;		//clear previous result
	
	
	ADC_CONTR = ADC_POWER|ADC_SPEEDLL|ADC_START;
	
	delay1ms();
	

	IE =0xa0;			//enable EADC interrupt
}

void AD_Get()
{
	ADC_CONTR = ADC_POWER|ADC_SPEEDLL|ADC_START;    //Start ADC Tran
	_nop_();    //need some delay
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	
}

main.c

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#include <main.h>

sfr AUXR = 0x8e;

#define TIMS  (256- (11059200L/32/9600))

unsigned int  adValue;
unsigned char temp;



void UART1_Init()
{
	EA = 1;
	ES = 1;
	
	TR1 = 1;
	
	TMOD = 0x20;
	
	TH1 = TL1 = TIMS ;
	
	SCON = 0x50;
	
	AUXR = 0x40;
	
}


void sendData (unsigned char dat)
{
	while(!TI);
	TI = 0;
	SBUF = dat;
}


void main()
{
	UART1_Init();
	SBUF = 0x66;
	AD_Init();
	while(1)
	{
	 AD_Get();
	 delay1s();
	 adValue = ((int)(temp*100)/255)*5;
	 sendData(adValue/100);
	 sendData(adValue/10%10);
         sendData(adValue%10);

	}
}




void AD_Tran_Interrupt() interrupt 5
{
	ADC_CONTR &=!ADC_FLAG ;		//clear ADC interrupt flag
	
	temp = ADC_RES;

}


main.h

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#ifndef __MAIN_H
#define __MAIN_H

#include <reg52.h>
#include <AD.h>


#endif