analog.c

web51代码

//-----------------------------------------------------------------------------
// Net ANALOG.C
//
// This module handles the analog inputs which are external temperature
// sensor, the on-chip temperature sensor, and operating voltage.
//-----------------------------------------------------------------------------
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <reg52.h>
#include "net.h"
#include "serial.h"
#include "analog.h"
#include <intrins.h>
	sbit adclk=P1^5;
	sbit addata=P1^6;
	sbit adcs=P1^7;
#define uchar unsigned char
#define uint  unsigned int
extern char xdata text[];
UINT idata cpu_temperature, air_temperature, cpu_voltage;
UCHAR idata mux_select;

/*********TLC549子程序***********************/
unsigned char ad(void)            //TLC549的采样子程序
{
    unsigned char i,sample_data;
	bit ea_flag;

    ea_flag=EA;
    EA=0;
    adcs=0;
    _nop_();
    _nop_();
    if(addata==1)
    {
        sample_data=1;
    }
    else
    {
        sample_data=0;
    }
    for(i=0;i<7;i++)
    {
        sample_data=(sample_data<<1);
        adclk=1;
        _nop_();
        _nop_();
        adclk=0;
        if(addata==1)
        {
            sample_data=(sample_data|0x01);
        }
    }
    adclk=1;
    _nop_();
    _nop_();
    adclk=0;
    _nop_();
    _nop_();
    
    adcs=1;
    EA=ea_flag;
    return sample_data;

}
//--------------------------------------------------------------------------
// This function is a little state machine which reads one analog
// inputs at a time, out of the 3 possible inputs
//  1. On-chip temperature
//  2. External air temperature
//  3. CPU operating voltage
//--------------------------------------------------------------------------
void read_analog_inputs(void)
{
   cpu_temperature=2500;
   air_temperature=(uint)ad()*19;
   cpu_voltage=50;
}