C51 COMPILER V7.09   ANALOG                                                                07/07/2004 14:57:17 PAGE 1   


C51 COMPILER V7.09, COMPILATION OF MODULE ANALOG
OBJECT MODULE PLACED IN ANALOG.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE ANALOG.C OPTIMIZE(9,SPEED) BROWSE DEBUG OBJECTEXTEND

line level    source

   1          //-----------------------------------------------------------------------------
   2          // Net ANALOG.C
   3          //
   4          // This module handles the analog inputs which are external temperature
   5          // sensor, the on-chip temperature sensor, and operating voltage.
   6          //-----------------------------------------------------------------------------
   7          #include <string.h>
   8          #include <stdlib.h>
   9          #include "C8051f.h"
  10          #include "net.h"
  11          #include "serial.h"
  12          #include "analog.h"
  13          
  14          extern char xdata text[];
  15          UINT idata cpu_temperature, air_temperature, cpu_voltage;
  16          UCHAR idata mux_select;
  17          
  18          sfr16 ADC0     = 0xbe;                 // ADC0 data
  19          
  20          //--------------------------------------------------------------------------
  21          // Initialize the A/D converter
  22          // 
  23          //--------------------------------------------------------------------------
  24          void init_adc(void)
  25          {
  26   1              ADC0CN = 0x81;                      // ADC0 enabled; normal tracking
  27   1                                              // mode; ADC0 conversions are initiated 
  28   1                                              // on write to AD0BUSY; ADC0 data is
  29   1                                              // left-justified
  30   1              REF0CN = 0x07;                      // enable temp sensor, on-chip VREF,
  31   1                                              // and VREF output buffer
  32   1              mux_select = MUX_CPU_TEMP;                      // CPU on-chip temp sensor
  33   1              AMX0SL = MUX_CPU_TEMP;  
  34   1      
  35   1         ADC0CF = (SYSCLK/2500000) << 3;     // ADC conversion clock = 2.5MHz
  36   1       //  ADC0CF |= 0x01;                     // PGA gain = 2
  37   1         EIE2 &= ~0x02;                      // disable ADC0 EOC interrupt
  38   1         EIE1 &= ~0x04;                      // disable ADC0 window compare interrupt
  39   1      }
  40          
  41          
  42          
  43          //--------------------------------------------------------------------------
  44          // This function is a little state machine which reads one analog
  45          // inputs at a time, out of the 3 possible inputs
  46          //  1. On-chip temperature
  47          //  2. External air temperature
  48          //  3. CPU operating voltage
  49          //--------------------------------------------------------------------------
  50          void read_analog_inputs(void)
  51          {
  52   1              ULONG idata temp_long;
  53   1      
  54   1          AD0INT = 0;                      // clear conversion complete indicator
  55   1          AD0BUSY = 1;                     // initiate conversion
C51 COMPILER V7.09   ANALOG                                                                07/07/2004 14:57:17 PAGE 2   

  56   1          while (AD0INT == 0);             // wait for conversion complete
  57   1              switch (mux_select)
  58   1              {
  59   2                      case MUX_CPU_TEMP:
  60   2                      temp_long = ADC0 - 42380/2;
  61   2                          temp_long= (temp_long * 200L) / 156;
  62   2                              cpu_temperature=temp_long;
  63   2                              AMX0SL = MUX_CPU_VOLTS;         // Select AIN1 for next read
  64   2                              mux_select = MUX_CPU_VOLTS;
  65   2                      break;
  66   2      
  67   2                      case MUX_CPU_VOLTS:
  68   2                              temp_long = ADC0;
  69   2                              temp_long = 24*temp_long/655*10;
  70   2                              cpu_voltage = temp_long;
  71   2                              AMX0SL = MUX_AIR_TEMP;          // Select on-chip temp sensor
  72   2                              mux_select = MUX_AIR_TEMP;
  73   2                      break;
  74   2      
  75   2                      case MUX_AIR_TEMP:
  76   2                              temp_long = ADC0;
  77   2                              temp_long = 24*temp_long/655*2;
  78   2                              air_temperature = temp_long;
  79   2                              AMX0SL = MUX_CPU_TEMP;   
  80   2                              mux_select = MUX_CPU_TEMP;
  81   2                      break;
  82   2      
  83   2                      default:
  84   2                              AMX0SL = MUX_CPU_TEMP;
  85   2                              mux_select = MUX_CPU_TEMP;
  86   2                      break;
  87   2              }
  88   1      }
  89           
  90          
  91           


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    207    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =      7       4
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)