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0802LCD 4位顯示程序 PIC單片機(jī)C語言程序

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0802的LCD顯示屏 PIC單片機(jī)程序



  1. #include <xc.h>
  2. #include<pic.h>
  3. //#include"head.h"
  4. #define uchar unsigned char
  5. #define uint unsigned int
  6. #pragma config FOSC = XT        // Oscillator Selection bits (XT oscillator)
  7. #pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
  8. #pragma config PWRTE = ON       // Power-up Timer Enable bit (PWRT enabled)
  9. #pragma config BOREN = OFF      // Brown-out Reset Enable bit (BOR disabled)
  10. #pragma config LVP = ON        // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming)
  11. #pragma config CPD = OFF        // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
  12. #pragma config WRT = OFF        // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
  13. #pragma config CP = OFF         // Flash Program Memory Code Protection bit (Code protection off)

  15. //char tab[]="0123456789";
  16. #define uchar unsigned char
  17. #define uint unsigned int
  18. void LCD_write_cmd(uchar command);
  19. void LCD_write_command(uchar command);
  20. void LCD_en_write(void);
  21. void LCD_set_xy( unsigned char x, unsigned char y );
  22. void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);
  23. void LCD_write_data(unsigned char data);
  24. void delay_nus(unsigned int n);
  25. void delay_nms(unsigned int n);   
  26. #define RS RC2
  27. #define EN RC3
  28. #define DB7 RC7
  29. #define DB6 RC6
  30. #define DB5 RC5
  31. #define DB4 RC4
  32. #define LCD_DATA_PORT PORTC
  33. #define LCD_DATA_TRIS TRISC
  34.    
  35.     /*------------------------------------------------------------------------------
  36.     函數(shù)說明
  37.     ------------------------------------------------------------------------------*/
  38. void LCD_init()
  39. {
  40.     TRISD=0x00; //數(shù)據(jù)口方向?yàn)檩敵?
  41.     PORTD=0x00;
  42.     TRISC=0x00; //數(shù)據(jù)口方向?yàn)檩敵?
  43.     PORTC=0x00;//設(shè)置EN、RS/數(shù)據(jù)為輸出
  44.       
  45.     LCD_write_cmd(0x30);//4位的指令
  46.     delay_nms(5);
  47.     LCD_write_cmd(0x30);
  48.     delay_nus(200);  
  49.     LCD_write_cmd(0x30);
  50.     delay_nms(1);
  51.     LCD_write_cmd(0x20);
  52.     LCD_write_cmd(0x20); //4位顯示
  53.     LCD_write_cmd(0x80);

  55.     LCD_write_cmd(0x00); //顯示開 游標(biāo)、閃爍不顯示
  56.     LCD_write_cmd(0x80);
  57.    
  58.     LCD_write_cmd(0x00); //清屏
  59.     LCD_write_cmd(0x01);
  60.    
  61.     LCD_write_cmd(0x00); //兩行 5*7
  62.     LCD_write_cmd(0xc0);
  63. }
  64. void LCD_write_cmd(uchar command) //寫指令
  65. {
  66.     delay_nus(10);
  67.     RS=0;
  68.     EN=0;//使能清零
  69.     LCD_DATA_PORT&=0x0f; //清除端口
  70.     delay_nus(2);
  71.     EN=1;
  72.     LCD_DATA_PORT |= (command & 0xf0);//高4位不用改
  73.     delay_nus(2);
  74.     EN=0;
  75. }

  77. void LCD_write_command(uchar command) //寫指令
  78. {
  79.     LCD_write_cmd(command);
  80.     LCD_write_cmd(command<<4);
  81. }

  83. void LCD_write_data(unsigned char data) //寫數(shù)據(jù)
  84. {
  85.     delay_nus(10);
  86.     RS=1;
  87.     EN=0;//使能清零
  88.     LCD_DATA_PORT&=0x0f;
  89.     EN=1;
  90.     LCD_DATA_PORT |= (data & 0xf0);//高4位不用改
  91.     delay_nus(2);
  92.     EN=0;
  93.     delay_nus(2);
  94.    
  95.     LCD_DATA_PORT&=0x0F; //清低四位
  96.     EN=1;
  97.     LCD_DATA_PORT |= ((data << 4) & 0xf0);//發(fā)送低4位
  98.     delay_nus(2);
  99.     EN=0;
  100.   }

  102. void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) //列x=0~15,行y=0,1
  103. {
  104.     LCD_set_xy( X, Y ); //寫地址
  105.     while (*s) // 寫顯示字符
  106.     {
  107.         LCD_write_data( *s );
  108.         s ++;
  109.     }
  110. }

  112. void LCD_set_xy( unsigned char x, unsigned char y )  //寫地址函數(shù)
  113. {
  114.     unsigned char address;
  115.     if (y == 0) address = 0x80 + x;
  116.     else        address = 0xc0 + x;
  117.     LCD_write_command( address);
  118.    
  119. }

  121. void delay_nms(unsigned int n) //N ms延時(shí)函數(shù)
  122. {
  123.     uint a,b;
  124.     for(a=n;a>0;a--)
  125.         for(b=80;b>0;b--);
  126. }

  128. void delay_nus(unsigned int n) //N us延時(shí)函數(shù)
  129. {
  130.     unsigned int i;
  131.     for (i=0;i<n/4;i++);
  132. }
  133. void main()
  134. {
  135.      LCD_init();
  136. //    LCD_write_command(0x0d); //光標(biāo)開
  137.      while(1)
  138.      {
  139.          RD0=1;
  140.          delay_nms(1000);
  141.          RD0=0;
  142.          delay_nms(1000);
  143.         LCD_write_string(0,0,"ceshiLCD");
  144.         LCD_write_string(0,1,"hahahaha");
  145.         delay_nms(2000);
  146.         
  147.      }
  148. }
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