哪个大佬能给看看我这单片机热电偶测温程序哪里有问题吗？

只看该作者 · 2020-5-6 18:27

这是个52单片机热电偶测温的程序，通过MAX6675转换温度数据的。具体功能就是热电偶测量温度然后读到单片机里再显示到数码管上，如果温度高于某个值就报警。
写到Proteus仿真里面数码管就从右往左闪烁，不能稳定显示，然后读的数据也不对。求大佬帮忙看看是程序哪里有问题吗万分感谢！
#include "reg52.h"
#include "absacc.h"
#include "math.h"
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit dula=P2^0; //数码管段选
sbit wei=P2^1; //数码管位选
sbit S0=P1^0; //MAX6675位定义
sbit SCK=P1^1;  //
sbit CS=P1^2; //
sbit beep=P1^3;  //蜂鸣器位定义
sbit Work=P1^4;  //工作LED灯位定义
uint Re_Convert (void); //热电偶温度转换
void Disp_temp();          //数码管显示
void Baojing();             //蜂鸣器报警
void delay(uchar); ///延时
uint P_Temp;
uint wendu,t1;
uint ge,shi,bai,qian;
uchar code tab1[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x7f};
uchar code tab2[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};

void main(void)  //主函数
{
beep=0;
  while(1)
  {
  Disp_temp();
  delay(500);
  Baojing();
  P_Temp=0;
  }
}

void delay(uchar t) //延时函数
{
uchar x;
uchar y;
for(x=0;x<t;x++)
for(y=0;y<110;y++);
}

uint Re_Convert() //热电偶温度读取
{
  uchar i;
  unsigned long P_Temp2;
  CS=1;    //MAX6675温度转换
  delay(10); //
  CS=0;    //MAX6675使能
  delay(1);
  SCK=1; //
  P_Temp2=0;

  for(i=0;i<16;i++)
  {
  SCK =0; //拉低电平给一个时钟信号
  P_Temp2=P_Temp2<<1;
  if(S0==1)
P_Temp2|=0x0001;
  else
P_Temp2&=0xffff;
  SCK=1;
  delay(10);
}
  CS =1;
  return(P_Temp2);
}
void Baojing(void) //报警函数
{
  if(t1<=100&&t1>=400) //温度小于100大于400报警
  {
delay(20);
beep=1;
  }
}
void Disp_temp() //显示函数
{

  P_Temp=Re_Convert();
  P_Temp=P_Temp<<1;
  P_Temp=P_Temp>>4;
  t1=P_Temp/4;//P_Temp =(1024*P_Temp)/4096

t1=t1*10;
ge=t1%10;
t1=t1/10;
shi=t1%10;
t1=t1/10;
bai=t1%10;
qian=t1/10;

P0=tab1[ge];  //¸öÎ»
dula=1;
dula=0;
P0=0x08;
wei=1;
wei=0;
delay(10);

P0=tab2[shi];  //Ê®Î»
dula=1;
dula=0;
P0=0x04;
wei=1;
wei=0;
delay(10);

P0=tab1[bai];  //°ÙÎ»
dula=1;
dula=0;
P0=0x02; //0000 0010
  wei=1;
wei=0;
delay(10);

  P0=tab1[qian]; //Ç§Î»
  dula=1;
dula=0;
P0=0x01; //Î»Ñ¡ Ç§Î» 0000 0001
  wei=1;
wei=0;
delay(10);
}

只看该作者 · 2020-5-6 21:34

为什么选用max6675啊这款老芯片，很难调适，而且面临停产，推荐你换用max31855K 成熟的电路案子

只看该作者 · 2020-5-9 15:24

数码管显示程序有问题吧，不知道你硬件是怎么接的，而且main中的延时，能显示稳定基本不可能啊

只看该作者 · 2020-5-27 11:09

#include "MAX31855_local.h"

MAX31855::MAX31855(unsigned char SO, unsigned char CS, unsigned char SCK)
{
so = SO;
cs = CS;
sck = SCK;

// MAX31855 data output pin
pinMode(so, INPUT);
// MAX31855 chip select input pin
pinMode(cs, OUTPUT);
// MAX31855 clock input pin
pinMode(sck, OUTPUT);

// Default output pins state
digitalWrite(cs, HIGH);
digitalWrite(sck, LOW);
}

/*******************************************************************************
* Name: readThermocouple
* Description: Read the thermocouple temperature either in Degree Celsius or
*                         Fahrenheit. Internally, the conversion takes place in the
*                         background within 100 ms. Values are updated only when the CS
*                         line is high.
*
* Argument    Description
* =========    ===========
* 1. unit    Unit of temperature required: CELSIUS or FAHRENHEIT
*
* Return          Description
* =========    ===========
* temperature Temperature of the thermocouple either in Degree Celsius or
*                         Fahrenheit. If fault is detected, FAULT_OPEN, FAULT_SHORT_GND or
*                         FAULT_SHORT_VCC will be returned. These fault values are outside
*                         of the temperature range the MAX31855 is capable of.
*******************************************************************************/
double  MAX31855::readThermocouple(unit_t unit)
{
unsigned long data;
double temperature;

// Initialize temperature
temperature = 0;

// Shift in 32-bit of data from MAX31855
data = readData();

// If fault is detected
if (data & 0x00010000)
{
      // Check for fault type (3 LSB)
      switch (data & 0x00000007)
      {
         // Open circuit
         case 0x01:
            temperature = FAULT_OPEN;
            break;

哪个大佬能给看看我这单片机热电偶测温程序哪里有问题吗？

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