"LCD module 1602 driver source code
//lcd1602 drive program for 51 mcu//designed by Wangchao//2006-6-14
＃i nclude ""reg52.h""/********************************************************************///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 ZERO 0
/*******************************************************************///change this part at different board#define LCDIO P2sbit LCD1602_ RS=P0^7; // data command select 1 data 0 command pin 4 sbit LCD1602_ RW=P0^6; // read write select 1 read 0 write pin 5sbit LCD1602_ EN=P0^5; // LCD enable signal pin 6
/********************************************************************/void LCD_ delay(void);// lcd delay void LCD_ en_ command(unsigned char command);// write command void LCD_ en_ dat(unsigned char temp);// write data void LCD_ set_ xy( unsigned char x, unsigned char y );// set display address void LCD_ write_ char( unsigned x,unsigned char y,unsigned char dat);// write lcd a character void LCD_ write_ string(unsigned char X,unsigned char Y,unsigned char *s);// write lcd string void LCD_ init(void);// lcd iniTIze
/********************************************************************/void delay_ nms(unsigned int n);// delay
/********************************************************************/void main(void){ LCD_ init(); while(TRUE ) { CLEARSCREEN; delay_ nms(2); LCD_ write_ string(0,LINE1,""Wellcome to DLUT""); LCD_ write_ string(0,LINE2,""www.dlut.edu.cn!""); delay_ nms(500); CLEARSCREEN; delay_ nms(2); LCD_ write_ string(0,LINE1,"" lcd test ""); LCD_ write_ string(0,LINE2,"" successful! ""); delay_ nms(500);
CLEARSCREEN;
delay_ nms(2); LCD_ write_ string(0,LINE1,"" I'm WangChao. ""); LCD_ write_ string(0,LINE2,"" Thank You! "");
delay_ nms(500); }}/********************************************************************//******************** LCD PART *************************************/void LCD_ delay(void) { unsigned char i; for(i=LCD_ DELAY_ TIME; i>ZERO; i--) // be sure lcd reset ;}/********************************************************************/ void LCD_ en_ command(unsigned char command){ LCDIO=command; LCD1602_ RS=LOW; LCD1602_ RW=LOW; LCD1602_ EN=LOW; LCD_ delay(); LCD1602_ EN=HIGH;}/********************************************************************/ void LCD_ en_ dat(unsigned char dat){ LCDIO=dat; LCD1602_ RS=HIGH; LCD1602_ RW=LOW; LCD1602_ EN=LOW; LCD_ delay(); LCD1602_ EN=HIGH;}/********************************************************************/ 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 CLEARSCREEN;// clear screen}/********************************************************************//*********************** OTHER PART *********************************/void delay_ nms(unsigned int n) { unsigned int i=0,j=0; for (i=n; i>0; i--) for (j=0; j<1140; j++); }/********************************************************************/, Read the full text, technical section
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