标题: lcd1602 4bit 驱动程序代码 [打印本页]
作者: cccc888    时间: 2017-12-21 19:04
标题: lcd1602 4bit 驱动程序代码
另存为xx.c文件，不同时钟频率下，根据需要修改delay_lcd函数。

  2. #include <AT89x51.h>
  3. #include "lcd4bit.h"

  5. sbit RS = P1^2;
  6. sbit En = P1^3;
  7. sbit D0 = P1^4;
  8. sbit D1 = P1^5;
  9. sbit D2 = P1^6;
  10. sbit D3 = P1^7;

  12. #define LCD_Port P1

  14. void init_lcd (void)
  15. {
  16.   RS = Lo;
  17.   write_nibble_lcd(0x03);        delay_lcd();
  18.   write_nibble_lcd(0x03);        delay_lcd();
  19.   write_nibble_lcd(0x02);        delay_lcd();
  20.   write_lcd(0x28);
  21.   write_lcd(0x06);
  22.   write_lcd(0x0c);
  23.   write_lcd(0x01);
  24. }  

  26. void gotoxy_lcd(unsigned char col,unsigned char line)
  27. {
  28.         RS = Lo;
  29.         if (line == 1)
  30.                 write_lcd(0x7f+col);
  31.         if (line == 2)
  32.                 write_lcd(0xbf+col);
  33. }

  35. void putc_lcd(unsigned char byte)
  36. {
  37.    RS = Hi;
  38.    write_lcd(byte);
  39. }

  41. void print_lcd(char String[])
  42. {
  43.         int i = 0;
  44.         do
  45.            {
  46.                 putc_lcd(String[i]);
  47.             i++;
  48.         }
  49.         while(String[i] != '\0');
  50. }

  52. void delay_lcd (void)
  53. {
  54.         int del1,del2;
  55.           for(del1=0;del1<10;del1++)
  56.           {
  57.             for(del2=0;del2<200;del2++);
  58.           }
  59. }

  61. void write_lcd(unsigned char Val)
  62. {
  63.         write_nibble_lcd(Val >> 4);
  64.         write_nibble_lcd(Val);
  65.         delay_lcd();
  66. }

  68. void write_nibble_lcd(unsigned char Val)
  69. {
  70.         En = Hi;
  71.         D0 = D1 = D2 = D3 = 0;
  72.         if(Val & 0x01)
  73.                 D0 = 1;
  74.         if(Val & 0x02)
  75.                 D1 = 1;
  76.         if(Val & 0x04)
  77.                 D2 = 1;
  78.         if(Val & 0x08)
  79.                 D3 = 1;
  80.         En = Lo;
  81. }

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另存为lcd4bit.h 文件

  2. #ifndef lcd4bit_h
  3. #define lcd4bit_h 1

  5. #define Hi 1
  6. #define Lo 0

  8. #ifndef TRUE
  9.         #define TRUE 1
  10. #endif

  12. #ifndef FALSE
  13.         #define FALSE 0
  14. #endif

  16. #define RIGHT 0
  17. #define LEFT  1

  19. void init_lcd(void);
  20. void write_high_lcd(unsigned char Val);
  21. void gotoxy_lcd(unsigned char col,unsigned char line);
  22. void putc_lcd(unsigned char byte);
  23. void print_lcd(char String[]);
  24. void delay_lcd(void);
  25. void write_lcd(unsigned char Val);
  26. void write_low_lcd(unsigned char Val);
  27. void write_command_lcd(char cmd);
  28. void scroll_lcd(char enable, char dir);
  29. //void clear_lcd();
  30. void write_nibble_lcd(unsigned char Val);

  32. #endif

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