temperature.c

msc1210单片机内部温度传感器测试程序

#include "REG1210.H"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define LSB 			(1.25/8388608/375e-6)
#define WINDOWSIZE	16
extern void put_string(char code *string);
data char ROM_temp0 _at_ 0x000a;  // For put_string function
data char ROM_temp1 _at_ 0x000b;
signed long summer(void);
extern void putspace4(void);
extern void autobaud(void);
extern void tx_byte(char);
sbit P14 = P1^4;
sbit P15 = P1^5;
// recursive digit display routine
void prt_digit(unsigned long int i, signed char d) reentrant
{	unsigned long int j; char c;
	j=i/10; c=i-j*10; d--;
	if (j!=0 || !(d &0x80)) prt_digit(j,d);
	if (d==0) tx_byte('.');
	tx_byte(c+48);
}
// Display long integer number with sign and decimal
void print(signed long int i, unsigned char d) 
{
	if (i<0) { tx_byte('-'); i*=-1;}
	prt_digit(i,d); putspace4();		
}
void main(void)
{
	signed long int data sum;
	float data window[16]={0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
	float data adres=0, temperature;
	unsigned char j,k,i, fill_ptr=1, mod_ptr=0; 
//	char WINDOWSIZE=32;
   autobaud();
	put_string("\x1b[1;33;46m\x1b[2J\x1b[12CTemperature Sensor\n");
	PDCON &= 0x0f7;			//turn on adc
	ACLK = 1;					// ACLK = 1.8432MHz/(1+1)= 0.9216MHz
	DECIMATION = 0x7ff;	
	ODAC=0;
	ADCON0 = 0x20;			   // Vref on 1.25V, Buff off, BOD off, PGA 1
	ADMUX=0xff;
	ADCON1 = 0x01;				// bipolar, auto, self calibration, offset, gain
	SSCON=0;						// Clear SUMR0~3
	SSCON=228;					// Set SSCON for ADC 32 summations and div by 32
	sum=summer();
	SSCON=0;						// Clear SUMR0~3
	SSCON=228;					// Set SSCON for ADC 32 summations and div by 32
	while(1){
		P15=!P15;
		sum=summer();
		P15=!P15;
		SSCON=0;					// Clear SUMR0~3
		SSCON=228;				// Set SSCON for ADC 32 summations and div by 32
		adres=adres-window[mod_ptr];		// moving window of 10 results
		window[mod_ptr]=(float)sum*LSB-281.667; 
		adres=adres+ window[mod_ptr];
		temperature=adres/(float)fill_ptr;
		if (fill_ptr==WINDOWSIZE) fill_ptr=WINDOWSIZE; else fill_ptr++;
		if (mod_ptr==(WINDOWSIZE-1)) mod_ptr=0; else mod_ptr++; 
		print((signed long int)(temperature*1000),3); 
		put_string("degC ");
		put_string("\n");
	}
}