st7920.lst

51单片机实例

C51 COMPILER V7.06   ST7920                                                                07/16/2010 10:05:25 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE ST7920
OBJECT MODULE PLACED IN .\obj\ST7920.obj
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE ST7920.c BROWSE DEBUG OBJECTEXTEND PRINT(.\obj\ST7920.lst) OBJECT(.\obj\ST7
                    -920.obj)

stmt level    source

   1          /*-----------------------------------------------
   2            名称：st7920字库液晶显示
   3            论坛：www.doflye.net
   4            编写：shifang
   5            日期：2009.5
   6            修改：无
   7            内容：通过显示字符、数字、汉字和图片测试液晶基本功能
   8          ------------------------------------------------*/
   9          #include <reg52.h>
  10          #include <intrins.h>
  11          #include "delay.h"
  12          #include "ST7920.h"
  13          
  14          sbit RS = P2^4;
  15          sbit RW = P2^5;
  16          sbit E  = P2^6;
  17          sbit RES = P2^3;
  18          sbit PSB = P2^1;
  19          sbit PAUSE = P3^0;
  20          
  21          #define DataPort P0        //MCU P0<------> LCM
  22          
  23          /*------------------------------------------------
  24                              检测忙位
  25          ------------------------------------------------*/
  26          void Check_Busy()
  27          {  
  28   1          RS=0;
  29   1          RW=1;
  30   1          E=1;
  31   1          DataPort=0xff;
  32   1          while((DataPort&0x80)==0x80);//忙则等待
  33   1          E=0;
  34   1      }
  35          /*------------------------------------------------
  36                             写命令
  37          ------------------------------------------------*/
  38          void Write_Cmd(unsigned char Cmd)
  39          {
  40   1              Check_Busy();
  41   1              RS=0;
  42   1              RW=0;
  43   1              E=1;
  44   1              DataPort=Cmd;
  45   1              DelayUs2x(5);
  46   1              E=0;
  47   1              DelayUs2x(5);
  48   1      }
  49          /*------------------------------------------------
  50                              写数据
  51          ------------------------------------------------*/
  52          void Write_Data(unsigned char Data)
  53          {
  54   1              Check_Busy();
C51 COMPILER V7.06   ST7920                                                                07/16/2010 10:05:25 PAGE 2   

  55   1              RS=1;
  56   1              RW=0;
  57   1              E=1;
  58   1              DataPort=Data;
  59   1              DelayUs2x(5);
  60   1              E=0;
  61   1              DelayUs2x(5);
  62   1      }
  63          /*------------------------------------------------
  64                             液晶屏初始化
  65          ------------------------------------------------*/
  66          void Init_ST7920()
  67          {  
  68   1         DelayMs(40);           //大于40MS的延时程序
  69   1         PSB=1;                 //设置为8BIT并口工作模式
  70   1         DelayMs(1);            //延时
  71   1         RES=0;                 //复位
  72   1         DelayMs(1);            //延时
  73   1         RES=1;                 //复位置高
  74   1         DelayMs(10);
  75   1         Write_Cmd(0x30);       //选择基本指令集
  76   1         DelayUs2x(50);         //延时大于100us
  77   1         Write_Cmd(0x30);       //选择8bit数据流
  78   1         DelayUs2x(20);         //延时大于37us
  79   1         Write_Cmd(0x0c);       //开显示(无游标、不反白)
  80   1         DelayUs2x(50);         //延时大于100us
  81   1         Write_Cmd(0x01);       //清除显示，并且设定地址指针为00H
  82   1         DelayMs(15);           //延时大于10ms
  83   1         Write_Cmd(0x06);       //指定在资料的读取及写入时，设定游标的移动方向及指定显示的移位，光标从右向左加1