adc0mode1.#3

c8051f020温度采集程序,利用内部温度传感器进行温度采集

#include <c8051F020.h>
#include <intrins.h>

typedef unsigned char tByte;
typedef unsigned int  tWord;
typedef unsigned long tLong;

sbit CS1=P3^6;
#define	SYSCLK			11059200
#define ADCFrequency   10000     //ADC frequency is 10K
// Define Timer 0 reload values for ~1 msec delay
#define PRELOAD01  (65536 - (unsigned int)(SYSCLK / (12 * 1000)))    
#define PRELOAD01H (PRELOAD01 / 256)
#define PRELOAD01L (PRELOAD01 % 256)

sfr16 ADC0 = 0xbe;   //define 16 bits SFR for ADC0

void SYSCLK_Init (void);
void PORT_Init (void);
void TIMER0_Init(void);
void ADC0_Init(void);
void LCD_Init(void);
void LCD_Update(void);
void Timer0update(void);
void delay(void);
void Delay_n_ms(unsigned int n);


//grobal varibles
tByte first = 0;
tByte second = 0;
tByte third = 0;
tByte forth = 0;

tWord temperature;
tWord result;  //grobal variable ,the result of AD convertion

//---------------************************-----------------//
void main(void)
{ 
  tWord temp_int,temp_frac;
  tWord temp_differ;
  tByte i;
  tByte tempint,tempfrac;
  tWord temp[10];
  WDTCN = 0xde;	
  WDTCN = 0xad;                        // disable the Watchdog
  SYSCLK_Init ();                     // initialize oscillator
  PORT_Init ();                       // initialize crossbar and GPIO
  LCD_Init();                         //initialize the display of LCD
  TIMER0_Init();                      // initialize TIMER01
  ADC0_Init();
  EA=0;                            //disnable all interrupt
  AD0INT = 0;
  Delay_n_ms(1);
  AD0BUSY =1;                       //sample of the temperature of surrounding
  while(AD0INT == 0);
  temperature = ADC0&0x0FFF;
  for(i=0;i<5;i++) Delay_n_ms(60000);       //wait five minutes
  AD0INT = 0;
  AD0BUSY =1;
  while(AD0INT == 0);                  //sample the temperature of internal 
  temp_differ = (ADC0&0x0FFF) - temperature;    //obtain the differance between the temperature of surrounding and internal
  
  while(1)
    { 
	  temperature = 0;
	  for(i=0;i<10;i++)
	    {
		  AD0INT = 0;
          AD0BUSY =1;
          while(AD0INT == 0);                  //sample the temperature of internal 
          temp[i] = ADC0;
		  Delay_n_ms(1);
		  temperature += temp[i];
		 }
       temperature = temperature/10;
	   temperature = (temperature-temp_differ)- 2582;
	   temperature = (temperature*100)/9;
	   temp_int = temperature/100;
	   temp_frac = temperature - temp_int*100;
	   tempint = (unsigned char)temp_int;
	   tempfrac = (unsigned char)temp_frac;
	   forth = tempint/10;
	   third = tempint - forth*10;
	   second = tempfrac/10;
	   first = tempfrac - second*10;
	   LCD_Update();
	   Delay_n_ms(50);      
	   
	 }
}



//--------***************************---------------------------//

void SYSCLK_Init(void)
{
    tWord n;
	OSCXCN = 0x67;	// EXTERNAL Oscillator Control Register
	                //use the Crystal Oscillator, Frequency is 11.0592MHz	
    for (n = 0; n < 255; n++) ;            // wait for osc to start
    while ( !(OSCXCN & 0x80));        // wait for xtal to stabilize
	OSCICN = 0x88;	// Internal Oscillator Control Register
	                //disable the Internal Oscillator, enable the Oscillator Checker
}

void PORT_Init(void)
{
  	XBR0 = 0x00;	// XBAR0: Initial Reset Value
	XBR1 = 0x00;	// XBAR1: Initial Reset Value
	XBR2 = 0x40;	// XBAR2:  Enable crossbar
	//P0~P3 only are GPIO ports
	P0MDOUT = 0x00; // Output configuration for P0 
    P1MDOUT = 0x00; // Output configuration for P1 
    P2MDOUT = 0x00; // Output configuration for P2 
    P3MDOUT = 0x00; // Output configuration for P3 
    P74OUT = 0x00;  // Output configuration for P4-7
	//every pin of P0~P7 is Open-Drain Output/Input(Digital)
    P1MDIN = 0xFF;  // Input configuration for P1    
}

void ADC0_Init(void)
{
  REF0CN = 0x03;     //tempture sensor opened, Internal VREF enable 
  AMX0CF = 0x00;	// AMUX Configuration Register
  AMX0SL = 0x02;	// AMUX Channel Select Register //  select temp sensor
  ADC0CF = 0x41;	// ADC Configuration Register  //10 sysclk; PGA is 2
  ADC0CN = 0x80;	// ADC Control Register  //enable ADC0, start source of ADC is AD0BUSY
 
}

void TIMER0_Init(void)
{
    TMOD = 0x01;    // Timer Mode Register 
   	TH0=PRELOAD01H;
    TL0=PRELOAD01L;
	TR0 =0;
}

void LCD_Init(void)   //LCD display "0000"
{
  P3 = 0x00;
  CS1 = 1;
  delay();
  CS1 = 0;
  P3 = 0x10;
  CS1 = 1;
  delay();
  CS1 = 0;
  P3 = 0x20;
  CS1 = 1;
  delay();
  CS1 = 0;
  P3 = 0x30;
  CS1 = 1;
  delay();
  CS1 = 0;
}


void LCD_Update(void)
{
     P3 = (0x00|first);
     CS1=1;
     delay();
     CS1=0;
     P3 = (0x10|second);
     CS1=1;
	 delay();
     CS1=0;
     P3 = (0x20|third);
     CS1=1;
	 delay();
     CS1=0;
     P3 = (0x30|forth);
     CS1=1;
	 delay();
     CS1=0;    
} 


void Timer0update(void)
{
  TF0=0;
  TR0=0;
  TH0=PRELOAD01H;
  TL0=PRELOAD01L;
}

void Delay_n_ms(unsigned int n)
{
  while(n--)
  {
    TR0=1;
	while(TF0==0);
	Timer0update();
  }
}

void delay(void)
 {
  _nop_();
  _nop_();

 }