MSP430单片机温度测量源程序

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

MSP430单片机温度测量源程序

介绍：源程序代码主要包含初始化子程序InitSys()、ADC数据读取子程序Read_ADC()、ADC数据转换为温度子程序ADC_TO_TEM()。

来源：晖创电子网www.schuitron.comMSP430源程序例程

源程序调试OK

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

#include

#defineTEM_ADC_CHL0x0a

voidInitSys(void);

voidRead_ADC(unsignedintINCH_channel);

voidADC_TO_TEM(void);

unsignedintADC_sample_val;

unsignedintlongtemp1,temp2;

unsignedintlongIntDegC;

unsignedintlongIntDegF;

voidmain(void)

{

InitSys();

while(1)

{

Read_ADC(TEM_ADC_CHL);

ADC_TO_TEM();

}

}

voidInitSys(void)

{

//INITSYSTEMCLKS(ACLKANDDCO/MCLK)

WDTCTL=WDTPW+WDTHOLD;//关闭看门狗

BCSCTL1=0x87;//ACLK分频系数是1，内部电阻选7

DCOCTL=0xe0;//设置DCO输出时钟频率5MHz

BCSCTL2=SELM_0;//选择MCLK为DCOCLK，内部电阻

ADC10CTL1|=0x08;//转换时钟为ACLK

ADC10CTL0=SREF_1+ADC10SHT_0+REFOUT+REFON+ADC10ON;

//选择内部电压1.5V，采样时间4XADC10CLKS

}

voidRead_ADC(unsignedintINCH_channel)

{

unsignedinttmp;

ADC10CTL0&=~ENC;

tmp=ADC10CTL1;

tmp&=0x0fff;

tmp|=(INCH_channel<<12);

ADC10CTL1=tmp;

ADC10CTL0|=ENC+ADC10SC;

while(ADC10CTL1&ADC10BUSY)

{}

ADC_sample_val=ADC10MEM;

ADC10CTL0&=~ENC;

}

voidADC_TO_TEM(void)

{

//oC=((A10/1024)*1500mV)-986mV)*1/3.55mV=A10*423/1024-278

temp1=ADC10MEM;

IntDegC=((temp1-673)*423)/1024;

//oF=((A10/1024)*1500mV)-923mV)*1/1.97mV=x*761/1024-468

temp2=ADC10MEM;

IntDegF=((temp2-630)*761)/1024;

}