1602 character LCD program written in C51

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

#define TRUE 1
#define FALSE 0
//Set the baud rate
#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"
/////////////////////////////
//定义LCD控制引脚
////////////////////////////
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 char  cursor, 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
/************************************************************
**This development board supports 1602 character LCD
**You can find a lot of interface information for this LCD by using Google
** Pin definition:
* 1---GND
* 2---VDD
* 3---VLCD: Contrast adjustment
* 4---RS: Register selection, select data register when high level, select instruction register when low level
* 5---R/W: Read and write signal line, read operation when high level, write operation when low level.
          When RS and RW are both low level, instructions can be written or display addresses can be displayed. When RS is low level and
          RW is high level, busy signal can be read. When RS is high level and RW is low level, data can be written.
* 6---E: Enable terminal. When E terminal jumps from high level to low level, the LCD module executes the command.
* 7~14---DB0~DB7 data lines,
* 15---A: backlight pin, "A" connects to positive
* 16---K: backlight pin, "K" connects to negative

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

/*向LCD写入命令*/
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);
}

/*显示屏字符串写入函数*/
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);
}
//光标复位
void lcd_reset_cursor(void)
{
    lcd_write_cmd(0x02);
}

//Set the display mode
void lcd_set_mode(unsigned char cursor, unsigned char text)
{
    unsigned char mode="0x04";
    if(cursor){//Cursor moves right
        mode|=0x02;
    }
    else{//Cursor moves left
        mode|=0x00;
    }
    if(text){//Text moves
        mode|=0x01;
    }
    else{//Text does not move
        mode|=0;
    }
    lcd_write_cmd(mode);
}

   
void lcd_init(void)
{
    P0=0;
    LCDE="1";
    delay_ms(500);
    lcd_clear();
    lcd_write_cmd(0x38);//Set LCD function: 8-bit bus, dual-line display, 5X7 dot matrix character
    lcd_write_cmd(0x0f);//Display switch control: display ON, cursor ON, blink ON
    lcd_write_cmd(0x06);//Cursor input mode incremental shift
    lcd_write_cmd(0x80);
    //lcd_write_cmd(0x0c);
    //lcd_clear();
}
//Read status, busy or not
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)
    {
    }
}