mt888.lst

Code C for transmit and receive DTMF with MT8888

C51 COMPILER V7.06   MT888                                                                 02/06/2009 11:22:07 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE MT888
OBJECT MODULE PLACED IN MT888.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE MT888.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #include "AT89X52.h"
   2          #include "MT888.h"
   3          #include "stdio.h"
   4          
   5          #define RS_MT P1_7
   6          #define RD_MT P1_6
   7          #define WR_MT P1_5
   8          
   9          #define D0 P3_7
  10          #define D1 P3_6
  11          #define D2 P3_5
  12          #define D3 P3_4
  13          
  14          char bdata MT_Read;
  15          sbit TFinished = MT_Read^1;
  16          sbit DRecieved = MT_Read^2;
  17          
  18          unsigned char  Digit;
  19          /////////////////////////////////////////////////////////////////
  20          //                                                                                                              ////////
  21          ////////////////////////////////////////////////////////////////
  22          
  23          void write_data_transmit(unsigned char dat)
  24          {
  25   1              if(dat&0x01==1) D0 = 1;
  26   1              else D0 = 0;
  27   1              if((dat>>1)&0x01==1) D1 = 1;
  28   1              else D1 = 0;
  29   1              if((dat>>2)&0x01==1) D2 = 1;
  30   1              else D2 = 0;
  31   1              if((dat>>3)&0x01 ==1) D3 = 1;
  32   1              else D3 = 0;
  33   1              RS_MT = 0;
  34   1              RD_MT = 1;
  35   1              WR_MT = 0;
  36   1              WR_MT =1;
  37   1      }
  38          
  39          unsigned char read_data_reg()
  40          {
  41   1              unsigned char dat;
  42   1              D0 = 1;
  43   1              D1 = 1;
  44   1              D2 = 1;
  45   1              D3 = 1;
  46   1              RS_MT = 0;
  47   1              WR_MT = 1;
  48   1              RD_MT = 0;
  49   1              dat = 0x00;
  50   1              if(D0 == 1) dat = dat|0x01;
  51   1              if(D1 == 1) dat = dat|0x02;
  52   1              if(D2 == 1) dat = dat|0x04;
  53   1              if(D3 == 1) dat = dat|0x08;
  54   1              RD_MT = 1;
  55   1              return dat;
C51 COMPILER V7.06   MT888                                                                 02/06/2009 11:22:07 PAGE 2   

  56   1      
  57   1      }
  58          
  59          void write_control_reg(unsigned char dat)
  60          {
  61   1              if(dat&0x01==1) D0 = 1;
  62   1              else D0 = 0;
  63   1              if((dat>>1)&0x01==1) D1 = 1;
  64   1              else D1 = 0;
  65   1              if((dat>>2)&0x01==1) D2 = 1;
  66   1              else D2 = 0;
  67   1              if((dat>>3)&0x01 ==1) D3 = 1;
  68   1              else D3 = 0;
  69   1              RS_MT = 1;
  70   1              RD_MT = 1;      
  71   1              WR_MT = 0;
  72   1              WR_MT = 1;
  73   1      }
  74          
  75          unsigned char read_status_reg()
  76          {
  77   1              unsigned char dat;
  78   1              D0 = 1;
  79   1              D1 = 1;
  80   1              D2 = 1;
  81   1              D3 = 1;
  82   1              RS_MT = 1;
  83   1              WR_MT = 1;
  84   1              RD_MT = 0;
  85   1          dat=0x00;
  86   1              if(D0 ==1) dat=dat|0x01;
  87   1              if(D1 ==1) dat=dat|0x02;
  88   1              if(D2 ==1) dat=dat|0x04;
  89   1              if(D3 ==1) dat=dat|0x08;
  90   1      
  91   1              RD_MT = 1;                                                 
  92   1              return dat;
  93   1      
  94   1      }
  95          
  96          void initMT8888(void)
  97          {
  98   1      
  99   1              read_status_reg();
 100   1              write_control_reg(0);
 101   1              write_control_reg(0);
 102   1              write_control_reg(8);
 103   1              write_control_reg(0);
 104   1              read_status_reg();
 105   1      
 106   1      }
 107          void setupMT8888(void)
 108          {
 109   1      
 110   1              write_control_reg(13);
 111   1              write_control_reg(0);
 112   1      }
 113          
 114          void TransmitDTMF(unsigned char digit)
 115          {
 116   1              write_data_transmit(digit);
 117   1              do      
C51 COMPILER V7.06   MT888                                                                 02/06/2009 11:22:07 PAGE 3   

 118   1              {
 119   2                      MT_Read = 0x00;
 120   2                      MT_Read = read_status_reg();
 121   2      
 122   2              }
 123   1              while (TFinished==0);
 124   1      }
 125          
 126          unsigned char ReceiveDTMF()
 127          {
 128   1              MT_Read = 0x00;
 129   1              MT_Read = read_status_reg();
 130   1              while(MT_Read^2==1)
 131   1              {
 132   2                      Digit = read_data_reg();
 133   2                      MT_Read = read_status_reg();
 134   2              }
 135   1              Digit =Digit&0x0f;       // b? nible cao v