用C51寫的1602字符型LCD程序

//FileName:delay.h
#ifndef __LZP_DELAY_H_
#define __LZP_DELAY_H_

#define TRUE 1
#define FALSE 0
//設(shè)置波特率
#define OSC_FREQ 11059200L

#define BAUD_115200 256 - (OSC_FREQ/192L)/115200L // 255
#define BAUD_57600 256 - (OSC_FREQ/192L)/57600L // 254
#define BAUD_38400 256 - (OSC_FREQ/192L)/38400L // 253
#define BAUD_28800 256 - (OSC_FREQ/192L)/28800L // 252
#define BAUD_19200 256 - (OSC_FREQ/192L)/19200L // 250
#define BAUD_14400 256 - (OSC_FREQ/192L)/14400L // 248
#define BAUD_9600 256 - (OSC_FREQ/192L)/9600L // 244
// Timer2
#define RCAP2_50us 65536L - OSC_FREQ/240417L
#define RCAP2_1ms 65536L - OSC_FREQ/12021L

void delay_ms(unsigned int num);
void delay_50us(unsigned char num);
void delay_us(unsigned char num);

#endif

//FileName:delay.c
/********************************************
** start51 study board
** delay function implementation
** author:bluehacker
** QQ:282074921
**********************************************/
#include "delay.h"
#include "reg52.h"

void delay_ms(unsigned int num)
{
RCAP2H = (RCAP2_1ms>>8);
RCAP2L=(RCAP2_1ms&0x00ff);
TH2=(RCAP2_1ms>>8);;
TL2=(RCAP2_1ms&0x00ff);;

ET2 = 0; // Disable timer2 interrupt
T2CON = 0x04; // 16-bit auto-reload, clear TF2, start timer

while (num--)
{
while (!TF2);
TF2 = FALSE;
}
TR2 = FALSE;
}

void delay_50us(unsigned char num)
{
RCAP2H=(RCAP2_50us>>8);
RCAP2L=(RCAP2_50us&0x00ff);
TH2=(RCAP2_50us>>8);
TL2=(RCAP2_50us&0x00ff);
ET2=0;
T2CON=0x04;
while(num--)
{
while(!TF2)
TF2=FALSE;
}
TR2=FALSE;
}

void delay_us(unsigned char num)
{
unsigned char i;
for (i=0;i {
}
}

//FileName:lcd.h

#ifndef __LZP_LCD_H_
#define __LZP_LCD_H_
#include "reg52.h"
/////////////////////////////
//定義LCD控制引腳
////////////////////////////
sbit LCDRS="P2"^0;
sbit LCDRW="P2"^1;
sbit LCDE="P2"^2;

void lcd_write_cmd(unsigned char cmd);
void lcd_write_data(unsigned char dat);
void lcd_clear(void);
void lcd_init(void);
unsigned char lcd_status(void);
void lcd_set_mode(unsigned charcursor, unsigned char text);
void lcd_write_str(unsigned char x,unsigned char y,unsigned char *s);
void lcd_write_char(unsigned char x,unsigned char y, unsigned char d);
#endif

//FileName:lcd.c
/********************************************************
**本開發(fā)板支持1602 字符型LCD
**這種LCD的接口資料可以用google找到很多
**引腳定義：
* 1---GND
* 2---VDD
* 3---VLCD：對比度調(diào)節(jié)
* 4---RS：寄存器選擇，高電平時選擇數(shù)據(jù)寄存器、低電平時選擇指令寄存器
* 5---R/W：讀寫信號線，高電平時進(jìn)行讀操作，低電平時進(jìn)行寫操作。
當(dāng)RS和RW共同為低電平時可以寫入指令或者顯示地址，當(dāng)RS為低電平
RW為高電平時可以讀忙信號，當(dāng)RS為高電平RW為低電平時可以寫入數(shù)據(jù)。
* 6---E：使能端，當(dāng)E端由高電平跳變成低電平時，液晶模塊執(zhí)行命令。
* 7~14---DB0~DB7數(shù)據(jù)線、
* 15---A：背光引腳,"A"接正
* 16---K：背光引腳,"K"接負(fù)

*********************************************************/
#include "lcd.h"
#include "delay.h"
#include "intrins.h"

/*向LCD寫入命令*/
void lcd_write_cmd(unsigned char cmd)
{
unsigned char status;
P0=cmd;
LCDRS="0";
LCDRW="0";
LCDE="0";
delay_us(5);
do{
status="lcd"_status();
}while(status&0x80);

LCDE="1";

}

void lcd_write_data(unsigned char dat)
{
unsigned char status;

P0=dat;
LCDRS="1";
LCDRW="0";
LCDE="0";
delay_us(5);
do{
status="lcd"_status();
}while(status&0x80);

LCDE="1";

}

void lcd_clear(void)
{
lcd_write_cmd(0x01);
}

/*顯示屏字符串寫入函數(shù)*/
void lcd_write_str(unsigned char x,unsigned char y,unsigned char *s)
{

if (y == 0) {
lcd_write_cmd(0x80 + x);
}
else {
lcd_write_cmd(0xC0 + x);
}

while (*s) {
lcd_write_data( *s);
s ++;
}

/*
unsigned char i;
for(i=0;i<16&&s!=0;i++)
{
lcd_write_char(x+i,y,s);
}
*/
}

void lcd_write_char(unsigned char x,unsigned char y, unsigned char d)
{
if(y==0)
{
lcd_write_cmd(0x80+x);
}
else
{
lcd_write_cmd(0xc0+x);
}
lcd_write_data(d);
}
//光標(biāo)復(fù)位
void lcd_reset_cursor(void)
{
lcd_write_cmd(0x02);
}

//設(shè)置顯示模式
void lcd_set_mode(unsigned charcursor, unsigned char text)
{
unsigned char mode="0x04";
if(cursor){//光標(biāo)右移
mode|=0x02;
}
else{//光標(biāo)左移
mode|=0x00;
}
if(text){//文字移動
mode|=0x01;
}
else{//文字不移動
mode|=0;
}
lcd_write_cmd(mode);
}

void lcd_init(void)
{
P0=0;
LCDE="1";
delay_ms(500);
lcd_clear();
lcd_write_cmd(0x38);//設(shè)置lcd功能：8位總線，雙行顯示，5X7點陣字符
lcd_write_cmd(0x0f);//顯示開關(guān)控制：顯示ON,光標(biāo)ON,閃爍ON
lcd_write_cmd(0x06);//光標(biāo)輸入方式增量移位
lcd_write_cmd(0x80);
//lcd_write_cmd(0x0c);
//lcd_clear();
}
//讀取狀態(tài)，是否忙
unsigned char lcd_status(void)
{
unsigned char tmp="0";
P0=0xff;
LCDRS="0";
LCDRW="1";
LCDE="0";
_nop_();
LCDE="1";
//_nop_();
tmp="P0";
return tmp;
}

//FileName:test.c
/*******************************
** Start51 study board test software
** test 1602LCD
** author: bluehacker
** QQ:282074921
***********************************/

#include "lcd.h"
#include "delay.h"
#include "intrins.h"

void main(void)
{
//初始化串口
SCON="0x50";/*mode 1,1 start bit ,8 data bit ,1 stop bit,enable receive*/
PCON="0x80";/*SMOD=1, Baud Rate twice*/
TMOD="0x21";/*timer 0--mode 1 and timer 1 ---mode2*/
//set baud rate,use timer 1 as baud rate generator
TH1=BAUD_19200;
TL1=TH1;
TR1=TRUE;
ET1=FALSE;//disable timer 1 interrupt
EA="0";

//delay_ms(400);
lcd_init();
// lcd_set_mode(1,0);
//lcd_reset_cursor();
// lcd_write_char(3,1,'c');
lcd_write_str(2,0,"bluehacker");
lcd_write_str(2,1,"QQ:282074921");
while(1)
{
}
}