lcd1602-4line.lst

单片机与键盘接口程序

C51 COMPILER V7.50   LCD1602_4LINE                                                         06/25/2007 18:03:15 PAGE 1   


C51 COMPILER V7.50, COMPILATION OF MODULE LCD1602_4LINE
OBJECT MODULE PLACED IN LCD1602-4line.OBJ
COMPILER INVOKED BY: f:\Keil\C51\BIN\C51.EXE LCD1602-4line.c BROWSE DEBUG OBJECTEXTEND TABS(2)

line level    source

   1          /*
   2            LCD1602.c File
   3            
   4            Created by Zhao liang
   5            email: [e-mail]
   6            May 2006
   7            
   8          */
   9          
  10          #include "LCD1602.h"
  11          
  12          
  13          void LCD_Read_BF(void)
  14          {
  15   1        
  16   1        unsigned char read=0; 
  17   1        
  18   1        LCD1602_RW = HIGH;    //RW 1
  19   1        LCD1602_RS = LOW;   //RS 0
  20   1        LCD1602_EN = HIGH;    //EN 1  Read BF
  21   1        
  22   1        LCDIO = 0xFF;
  23   1        
  24   1        do{
  25   2          read = LCDIO;
  26   2        }while(read&MSB);
  27   1        
  28   1        LCD1602_EN = LOW;   
  29   1      }
  30          
  31          void delay_1us(void)                 //1us延时函数
  32          {
  33   1          unsigned char i;
  34   1          for(i=0;i<1;i++);
  35   1      }
  36          
  37          void LCD_en_write(void)        //EN端产生一个高电平脉冲，写LCD
  38            {
  39   1          LCD1602_EN = HIGH;  
  40   1          delay_1us(); 
  41   1          LCD1602_EN = LOW; 
  42   1        }
  43          
  44          //*************************************
  45          void LCD_en_com(unsigned char command)
  46          {
  47   1        LCD_Read_BF(); 
  48   1        
  49   1        LCD1602_RS = LOW;     //RS 0 
  50   1        LCD1602_RW = LOW;   //RW 0 
  51   1        
  52   1        LCDIO &= 0x0F;
  53   1        LCDIO |= command&0xF0;
  54   1        
  55   1        LCD_en_write();
C51 COMPILER V7.50   LCD1602_4LINE                                                         06/25/2007 18:03:15 PAGE 2   

  56   1        
  57   1        command = command << 4; 
  58   1        LCDIO &= 0x0F;
  59   1        LCDIO |= command&0xF0;
  60   1        LCD_en_write();
  61   1      }
  62          //*********************************
  63          void LCD_en_dat(unsigned char dat)
  64          {
  65   1        LCD_Read_BF();
  66   1        
  67   1        LCD1602_RS = HIGH;  //RS 1 
  68   1        LCD1602_RW = LOW;   //RW 0 
  69   1        
  70   1        LCDIO &= 0x0F;
  71   1        LCDIO |= dat&0xF0;
  72   1        
  73   1        LCD_en_write();
  74   1        
  75   1        dat = dat << 4;
  76   1        LCDIO &= 0x0F;
  77   1        LCDIO |= dat&0xF0;
  78   1        LCD_en_write();
  79   1      }
  80          //**********************************************
  81          void LCD_set_xy(unsigned char x,unsigned char y)
  82          {
  83   1        unsigned char address;
  84   1        if(x == LINE1)  
  85   1          address = LINE1_HEAD + y;
  86   1        else      
  87   1          address = LINE2_HEAD + y;
  88   1        LCD_en_com(address); 
  89   1      }
  90          //****************************************************************
  91          void LCD_write_char(unsigned x,unsigned char y,unsigned char dat)
  92          {
  93   1        LCD_set_xy(x,y); 
  94   1        LCDIO = dat;
  95   1        LCD_en_dat(dat);
  96   1      }
  97          
  98          //*********************************************************************
  99          void LCD_write_string(unsigned char x,unsigned char y,unsigned char *s)
 100          {
 101   1        LCD_set_xy(x,y); 
 102   1        while(*s)  
 103   1        {
 104   2          LCDIO = *s;
 105   2          LCD_en_dat(*s);   
 106   2          s++;
 107   2        }
 108   1      }
 109          //****************/*********************
 110          void LCD_init(void)
 111          { 
 112   1        LCD_en_com(DATA_MODE);
 113   1          //set 8 bit data transmission mode 
 114   1        LCD_en_com(OPEN_SCREEN);
 115   1          //open display (enable lcd display)
 116   1        LCD_en_com(DISPLAY_ADDRESS);
 117   1          //set lcd first display address 
C51 COMPILER V7.50   LCD1602_4LINE                                                         06/25/2007 18:03:15 PAGE 3   

 118   1        CLEARSCREEN;
 119   1          //clear screen
 120   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    165    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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