tempsensor.c

8051试验程序 基础教材

//********************************************************************
//
// Author        : ADI - Apps            www.analog.com/MicroConverter
//
// Date          : April 2004
//
// File          : TempSensor.c
//
// Hardware      : ADuC845
//
// Description   : sample program that performs single ADC conversions on
//       the internal Temperature Sensor with a delay between
//       samples defined by the TIC. The results (in degrees C)
//                 transmitted via the UART.
//       Between conversions the part enters powerdown mode and is awoken
//       by the TIC interrupt in 5 second intervals.
//
//      Note: ADC1H contains the integer part of the temperature.
//            ADC1M & ADC1L contain the decimal parts of the temperature
//       result. Therefore divide the result by 65536d to get a
//            degree C result.
//********************************************************************

#include <stdio.h>
#include <ioADuC845.h>     //Only works with an ADuC845.

#define LED P3_bit.T0

long ADC=0;
float temperature=0;

void delay(int length)
{
while (length >=0)
    length--;
}

#pragma vector=0x53
__interrupt void TIC_int (void)
{
   ADCMODE = 0x12;      //ADC1 Enabled, Chop Enabled, Single conversion on Aux ADC
   while (!  ADCSTAT_bit.RDY1) {}
   ADC =   ADC1H*0x10000 + ADC1M*0x100 + ADC0L;    //Combine ADC data registers into one.
   temperature = (ADC - 0x800000)/65536.00;        //Subtract 800000h to remove bipolar offset and by
                                       //divide 10000h to convert to degrees C.
   printf("%dC\n\r", (int)(ADC1H - 0x80)); //Output celsius result not
                                           //including the decimal part to UART
                                       // 
   ADCSTAT_bit.RDY1 =0;                //Clear the ADC interrupt
   LED ^=1;                      //Blink LED twice to indicate completion of conversion.
   delay(10000);
   LED ^=1;
   delay(10000);
   LED ^=1;
   delay(10000);
   LED ^=1;
}


void main (void)
{
            //Configure UART
   T3CON       = 0x83;           //9600 Baud rate
   T3FD        = 0x12;
   SCON        = 0x52;
   PCON        = 0x10;    //ALE OFF
//Configure TIC
   IEIP2       = 0x04;     //Enable TIC interrupt
   IE_bit.EA   = 1;          //Enable global interrupts
   TIMECON     = 0xD0;   //Count in seconds
   INTVAL      =  0x05;   //Count duration (5 second delay between temperature readings)
   delay(10000);     //Delay to allow TIC registers be written
                  //Since TIC operates from 32.768kHz time must be given
            //to ensure the TIC registers are written to correctly.
   ADCMODE   = 0x11;      //ADC1 enabled, Chop enabled, ADC Idle mode
   SF        = 0x0FF;        //ADC Speed, 5Hz
   ADC1CON   = 0x0E;      //Internal Vref, Bipolar, Tempsensor.
   TIMECON   = 0xD3;         //Start counting, enable INTVAL counter & TIC counter

   for(;;)                 //Endless loop
   {
        PCON = 0x12;    //ALE OFF & Powerdown mode until awakened by the TIC interrupt
   }

}