main.c

热敏电阻测温

typedef unsigned char uchar;
typedef unsigned int  uint;
#include <msp430x16x.h>
#include "math.h"
#include "lcd.h"
#define   uint  unsigned int
#define   uchar unsigned char
//uchar static adc_flag=0;
uchar static count=0;
void Disp1Char(uchar x,uchar y,uchar data);
////////////////////////////////////////////////////
void int_clk()
{
    uchar i;
    BCSCTL1&=~XT2OFF;  //打开XT振荡器
    BCSCTL2|=SELM1+SELS;//MCLK 8M and SMCLK 1M  
    do
	{
        IFG1 &= ~OFIFG;                 //清除振荡错误标志 
        for(i = 0; i < 100; i++)
	  _NOP();			//延时等待
        }
    while ((IFG1 & OFIFG) != 0);	//如果标志为1继续循环等待
    IFG1&=~OFIFG;
}
//////////////////////////////////////////////////////
int_adc()
{  
  P6SEL |= 0X01;                              //选择AD通道
  ADC12CTL0 = SHT0_2 + ADC12ON;             // Set sampling time, turn on ADC12
  ADC12CTL1 = SHP;                          // Use sampling timer
  ADC12IE = 0x01;                           // Enable interrupt
  ADC12CTL0 |= ENC;  
}
////////////////////////////////////////////////////////

uint results;
int b1,b2,b3,b4;
float b;
uint padc=0; 
float r1=815.3570158;
float B=1202.656618;
#pragma vector=ADC_VECTOR
__interrupt void ADC12ISR (void)
{ 
  ADC12CTL0&=~ENC;
  //adc_flag=1;   
  results = ADC12MEM0;                   // 读取A0转换结果
  count++;
  count=0;
  LPM0_EXIT;
}
///////////////////////////////////////////
float rt,v;
void data()
{
  v=results*2.5/4095;
  rt=v*15000/(11*(3.3-v/11));
  b=B/(log(rt)-log(r1)+B/298.15)-273.15;
  b1=(uchar)(b/10);
  b2=(uchar)(b-b1*10);
  b3=(uchar)(((b-b1*10-b2)*100)/10);
  b4=(uchar)(((b-b1*10-b2)*100)-b3*10);
  Disp1Char(5,1,b1+48);
  Disp1Char(6,1,b2+48);
  Disp1Char(7,1,'.');
  Disp1Char(8,1,b3+48);
  Disp1Char(9,1,b4+48);
  uchar d;
    for(d=0;d<=20;d++)
    {
   Delay5ms();
    }
  count=0;
}
/////////////////////////////////////////////////////////////
int main( void )
{
   WDTCTL=WDTPW+WDTHOLD;//关闭看门狗
   int_clk();  //系统时钟初始化
   LcdReset();
   uchar *ptr="temperature:";
  _EINT();  //使能中断 
  int_adc();//初始化串口 
  DispStr(0,0,ptr) ;
  while(1)
  {
    ADC12CTL0 |= ADC12SC+ENC;   // 开启转换
    LPM0;
    data();
 }
}