掌握lcd1602液晶的编程方法.doc

/掌握lcd1602液晶的编程方法。/实验现象：液晶屏上显示 /LCD TEST 和 lcd test/SUCCESSFUL successful /lcd1602 drive program/for 51 mcu/designed by zhaoliang/2005-6-14 20:16#include /*/lcd part#define LINE1 0#define LINE2 1#define LINE1_HEAD 0x80#define LINE2_HEAD 0xC0#define LCD_DELAY_TIME 40#define DATA_MODE 0x38#define OPEN_SCREEN 0x0C#define DISPLAY_ADDRESS 0x80#define CLEARSCREEN LCD_en_command(0x01)/common part #define HIGH 1#define LOW 0#define TRUE 1#define FALSE 0#define ZERO 0 #define MSB 0x80#define LSB 0x01/*/change this part at different board#define LCDIO P2sbit LCD1602_RS=P14; /data command select 1 data 0 command pin 4 sbit LCD1602_RW=P13; /read write select 1 read 0 write pin 5sbit LCD1602_EN=P12; /LCD enable signal pin 6/*/void LCD_delay(void);/lcd delay function void LCD_en_command(unsigned char command);/write command functionvoid LCD_en_dat(unsigned char temp);/write data functionvoid LCD_set_xy( unsigned char x, unsigned char y );/set display address functionvoid LCD_write_char( unsigned x,unsigned char y,unsigned char dat);/write lcd a character functionvoid LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);/write lcd string functionvoid LCD_init(void);/lcd initize function/*/void delay_nms(unsigned int n);/delay function/*/void main(void) LCD_init(); while(TRUE ) CLEARSCREEN; delay_nms(2); LCD_write_string(0,LINE1, LCD TEST ); LCD_write_string(0,LINE2, SUCCESSFUL ); delay_nms(200); CLEARSCREEN; delay_nms(2); LCD_write_string(0,LINE1, lcd test ); LCD_write_string(0,LINE2, successful ); delay_nms(200); /*/* LCD PART */void LCD_delay(void) unsigned char i; for(i=LCD_DELAY_TIME;iZERO;i-)/be sure lcd reset ;/*/ void LCD_en_command(unsigned char command) LCD_delay(); LCD1602_RS=LOW; LCD1602_RW=LOW; LCD1602_EN=HIGH; LCDIO=command; LCD1602_EN=LOW;/*/void LCD_en_dat(unsigned char dat) LCD_delay(); LCD1602_RS=HIGH; LCD1602_RW=LOW; LCD1602_EN=HIGH; LCDIO=dat; LCD1602_EN=LOW;/*/void LCD_set_xy( unsigned char x, unsigned char y ) unsigned char address; if (y = LINE1) address = LINE1_HEAD + x; else address = LINE2_HEAD + x; LCD_en_command(address); /*/void LCD_write_char( unsigned x,unsigned char y,unsigned char dat) LCD_set_xy( x, y ); LCD_en_dat(dat);/*/void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) LCD_set_xy( X, Y ); /set address while (*s) / write character LCDIO=*s; LCD_en_dat(*s); s +; /*/void LCD_init(void) CLEARSCREEN;/clear screen LCD_en_command(DATA_MODE);/set 8 bit data transmission mode LCD_en_command(OPEN_SCREEN);/open display (enable lcd display) LCD_en_command(DISPLAY_ADDRESS);/set lcd first display address