max7219.lst

51单片机与 MAX7219的驱动程序编写, max7219 驱动8个LED

C51 COMPILER V7.02a   MAX7219                                                              01/24/2007 13:08:21 PAGE 1   


C51 COMPILER V7.02a, COMPILATION OF MODULE MAX7219
OBJECT MODULE PLACED IN max7219.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE max7219.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          //max7219 led drive program
   2          //for 51 mcu
   3          //designed by zhaoliang
   4          //2005-6-12 13:52
   5          #include <reg51.h> 
   6          /***********************************************************************/
   7          //common part 
   8          #define  HIGH     1
   9          #define  LOW      0
  10          #define  TRUE      1
  11          #define  FALSE      0
  12          #define  ZERO      0 
  13          #define  MSB       0x80
  14          #define  LSB       0x01
  15          //max7219 part
  16          #define  DECODE_MODE   0x09 
  17          #define  INTENSITY     0x0A 
  18          #define  SCAN_LIMIT    0x0B 
  19          #define  SHUT_DOWN     0x0C 
  20          #define  DISPLAY_TEST  0x0F 
  21          
  22          //pin defined
  23          /***********************************************************************/
  24          //change this part at different board
  25          sbit LOAD=P1^2; //MAX7219    Load-Data Input:    rising edge  pin 12 
  26          sbit DIN=P1^1; //MAX7219    Serial-Data Input:   rising edge  pin 1
  27          sbit CLK=P1^0; //MAX7219   Serial-Clock Input:  maximum 10MHz  pin 13
  28          
  29          //function define
  30          /***********************************************************************/
  31          void Write_Max7219_byte(unsigned char temp);//write max7219 a byte
  32          void Write_Max7219(unsigned char address,unsigned char dat);//write max7219 command and data
  33          void Init_Max7219(void);//Initize max7219
  34          
  35          //test program display from 1~8
  36          /***********************************************************************/
  37          void main(void)
  38          {
  39   1       unsigned char i; 
  40   1       Init_Max7219();  
  41   1       while(TRUE)
  42   1       {  
  43   2        for(i=1;i<9;i++) 
  44   2        {
  45   3         Write_Max7219(i,i);
  46   3        }
  47   2       } 
  48   1      }
  49          /***********************************************************************/
  50          void Write_Max7219_byte(unsigned char temp)
  51          {
  52   1       unsigned char i;
  53   1       for (i=0;i<8;i++)     
  54   1        { 
  55   2         CLK=LOW;
C51 COMPILER V7.02a   MAX7219                                                              01/24/2007 13:08:21 PAGE 2   

  56   2           DIN=(bit)(temp&MSB);      
  57   2           temp<<=1;  
  58   2           CLK=HIGH;
  59   2         }
  60   1      }
  61          /***********************************************************************/
  62          void Write_Max7219(unsigned char address,unsigned char dat)
  63          { 
  64   1       LOAD=LOW;
  65   1         Write_Max7219_byte(address); 
  66   1         Write_Max7219_byte(dat);
  67   1        LOAD=HIGH;                 
  68   1      }
  69          /***********************************************************************/
  70          void Init_Max7219(void)      
  71          { 
  72   1       Write_Max7219(SHUT_DOWN, 0x01);   //Normal Operation XXXXXXX1 Shutdown Mode   XXXXXXXX0
  73   1       Write_Max7219(DISPLAY_TEST, 0x00);   //Normal Operation XXXXXXX0 Display Test Mode XXXXXXXX1
  74   1       Write_Max7219(DECODE_MODE, 0xff);   //Decode Mode Select D7~D0 1 B decode 0 No decode 
  75   1       Write_Max7219(SCAN_LIMIT, 0x07);   //SCAN LIMIT 0~7 0xX0~0xX7
  76   1       Write_Max7219(INTENSITY, 0x04);   //Set Intensity   0xX0~0xXf
  77   1      }
  78          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     90    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       1
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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