main.lst

max7219级联程序实例,实现spi通信功能

C51 COMPILER V7.50   MAIN                                                                  10/03/2005 11:17:52 PAGE 1   


C51 COMPILER V7.50, COMPILATION OF MODULE MAIN
OBJECT MODULE PLACED IN main.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE main.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include <regx52.h>
   2          #include <stdio.h>
   3          #include<intrins.h>
   4          #define uchar unsigned char
   5          #define uint unsigned int
   6          void send(uchar outdata);
   7          void write(uchar addr1,uchar num1,uchar addr2,uchar num2);
   8          void init();
   9          sbit din=P2^0;
  10          sbit load=P2^1;
  11          sbit clk=P2^2; 
  12          //uchar codeseg[10]={0x7e,0x30,0x6d,0x79,0x33,0x5b,0x5f,0x70,0x7f,0x7b};
  13          void main()
  14          {
  15   1       write(0x0f,0x01,0x0f,0x01);
  16   1        _nop_();
  17   1        _nop_();
  18   1        _nop_();
  19   1        _nop_();
  20   1       write(0x0f,0x00,0x0f,0x00); //测试显示
  21   1       init();     //max7219初始化
  22   1       while(1)
  23   1       {
  24   2        write(0x01,1,0x01,9);//先送位，再送段/先发送给第一片 
  25   2        write(0x02,2,0x02,2);
  26   2        write(0x03,3,0x03,3);
  27   2        write(0x04,4,0x04,4);
  28   2        write(0x05,5,0x05,5);
  29   2        write(0x06,6,0x06,6);
  30   2        write(0x07,7,0x07,7);
  31   2        write(0x08,8,0x08,8);
  32   2       }
  33   1      }
  34          
  35          void init()
  36          {write(0x09,0xff,0x09,0xff);  //设置译码方式，使用bcd译码
  37   1       write(0x0a,0x0a,0x0a,0x0a);  //设置亮度
  38   1       write(0x0b,0x07,0x0b,0x07);  //设置扫描的位数
  39   1       write(0x0c,0x01,0x0c,0x01);  //设置待机方式
  40   1       } //先设置后面一片的工作方式，在设置前面一片的工作方式
  41          void write(uchar addr1,uchar num1,uchar addr2,uchar num2)
  42          {
  43   1        load=0;       //当LOAD为低电平时，芯片接收来自DIN的数据，接收完毕，
  44   1        _nop_();
  45   1        send(addr1);
  46   1         _nop_();
  47   1        send(num1);
  48   1        _nop_();
  49   1        clk=0;
  50   1        _nop_();
  51   1        clk=1;     //从DIN输入的数据经过16．5个CLK脉冲后移到DOUT引脚上。
  52   1                   //所以发完16个数据后必须加一个脉冲，否则数据传不到第二片
  53   1        send(addr2);
  54   1        _nop_();
  55   1        send(num2);
C51 COMPILER V7.50   MAIN                                                                  10/03/2005 11:17:52 PAGE 2   

  56   1        load=1;   //LOAD回到高电平时，接收的数据将被锁定
  57   1      }
  58          void send(uchar outdata)        //写串行数据子程序
  59          { uchar i,temp;
  60   1        for(i=0;i<8;i++)
  61   1        {
  62   2          temp=outdata&0x80;
  63   2          outdata=outdata<<1;
  64   2      
  65   2              if(temp==0x80)
  66   2               {
  67   3                 clk=0;
  68   3                 din=1;
  69   3                 _nop_();
  70   3                 clk=1;        //提供上升沿
  71   3                 }
  72   2              else
  73   2               {
  74   3                 clk=0;
  75   3                 din=0;
  76   3                 _nop_();
  77   3                 clk=1;        //提供上升沿
  78   3                 }
  79   2        }
  80   1      
  81   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    243    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       4
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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