1602相關(guān)知識及四線驅(qū)動程序

今天在調(diào)1602顯示的時候又費(fèi)了點(diǎn)小周折，由于平常我們一般是對液晶進(jìn)行寫操作，所以在有的開發(fā)板上這個引腳直接是接地的，今天自己用杜邦線連了個1602忽略了這個問題，后來接地就好了。

數(shù)據(jù)傳輸?shù)乃木€接法和八線接法差別在于寫數(shù)據(jù)的順序，下面附上四線接法的程序。

[cpp] view plaincopy/*--------------------------------------------------------------*/

//Name: LCD1602四線驅(qū)動程序

//File: LCD1602_4.H

//Date: 11-2-9

//TimE: 12:42

//Ver: 0.1

/*--------------------------------------------------------------*/

#include "reg51.h"

#include

//LCD1602接口定義

#define LCD_DATA P1 //P1口(P14~P17)與LCD高四位(D4~D7)對應(yīng)相接

sbit LCD1602_RS=P1^2; //數(shù)據(jù)指令

sbit LCD1602_EN=P1^3; //使能

//延時函數(shù),12mhz 6t延遲時間10*255us

void LCD_init(void);

void LCD_en_write(void);

void LCD_write_command(unsigned char command) ;

void LCD_write_data(unsigned char Recdata);

void LCD_set_xy (unsigned char x, unsigned char y);

void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);

void LCD_write_char(unsigned char X,unsigned char Y,unsigned char Recdata);

void delay_nus(unsigned int n);

void delay_nms(unsigned int n);

//以下函數(shù)用于輸出字符串和數(shù)字

int LCD_PutNum(unsigned long num,int XS,int pos);

int LCD_PutStr(unsigned char *DData,int pos);

//-------------------------1us延時函數(shù)---------------------------------

void delay_1us(void)

{

_nop_();

}

//------------------------N us延時函數(shù)---------------------------------

void delay_nus(unsigned int n)

{

unsigned int i=0;

for (i=0;i

delay_1us();

}

//-----------------------1ms延時函數(shù)----------------------------------

void delay_1ms(void)

{

unsigned int i;

for (i=0;i<1140;i++);

}

//-----------------------N ms延時函數(shù)---------------------------------

void delay_nms(unsigned int n)

{

unsigned int i=0;

for (i=0;i

delay_1ms();

}

//------------------------液晶初始化-----------------------------------

void LCD_init(void)

{

LCD_write_command(0x28);

delay_nus(40);

LCD_write_command(0x28);

delay_nus(40);

LCD_write_command(0x28);

delay_nus(40);

LCD_en_write();

delay_nus(40);

LCD_write_command(0x28); //4位顯示

LCD_write_command(0x0c); //顯示開

LCD_write_command(0x01); //清屏

delay_nms(2);

}

//----------------------液晶使能函數(shù)-------------------------------------

void LCD_en_write(void)

{ //EN由高電平跳變到低電平時液晶使能

LCD1602_EN=1;

delay_nus(1);

LCD1602_EN=0;

}

//------------------------寫指令函數(shù)--------------------------------------

void LCD_write_command(unsigned char command)

{

delay_nus(16);

LCD1602_RS=0; //RS=0

LCD_DATA &=0X0f; //清高四位

LCD_DATA|=command&0xf0; //寫高四位

LCD_en_write();

command=command<<4; //低四位移到高四位

LCD_DATA&=0x0f; //清高四位

LCD_DATA|=command&0xf0; //寫低四位

LCD_en_write();

}

//------------------------寫數(shù)據(jù)函數(shù)--------------------------------------

void LCD_write_data(unsigned char Recdata)

{

delay_nus(16);

LCD1602_RS=1; //RS=1

LCD_DATA&=0X0f; //清高四位

LCD_DATA|=Recdata&0xf0; //寫高四位

LCD_en_write();

Recdata=Recdata<<4; //低四位移到高四位

LCD_DATA&=0X0f; //清高四位

LCD_DATA|=Recdata&0xf0; //寫低四位

LCD_en_write();

}

//-----------------------地址定位函數(shù)-------------------------------------

void LCD_set_xy( unsigned char x, unsigned char y )

{

unsigned char address;

if (y == 0) address = 0x80 + x;

else address = 0xc0 + x;

LCD_write_command(address);

}

//----------------------在某個地址處，寫一個字符----------------------------[!--empirenews.page--]

void LCD_write_char(unsigned char X,unsigned char Y,unsigned char Recdata) //列x=0~15,行y=0,1

{

LCD_set_xy(X, Y); //寫地址

LCD_write_data(Recdata);

}

//----------------------------輸出字符串-------------------------------------

int LCD_PutStr(unsigned char *DData,int pos) //pos表示字符顯示位置，0~31

{

unsigned char i;

if(pos==-1)

{

LCD_write_command(0x01); //清屏

delay_nms(2);

pos=0;

}

while((*DData)!='