此为B站up：江科大自动协课程的12-2程序，学习用
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main.c

#include <REGX52.H>
#include "LCD1602.h"

void main()
{
        LCD_Init();
        LCD_ShowChar(1,1,'A');
        LCD_ShowString(1,5,"ABC");
        LCD_ShowNum(1,9,11,2);
        LCD_ShowSignedNum(2,1,-22,2);
        LCD_ShowHexNum(2,5,0xA5,2);
      LCD_ShowBinNum(2,9,0x03,2);
        while(1)
        {
        
        }
}

LCD1602.h

#ifndef __LCD1602_H__
#define __LCD1602_H__

void LCD_Init(void);
void LCD_ShowChar(unsigned char Line,unsigned char Colum,unsigned char Char);                                           //ÏÔʾ×Ö·û
void LCD_ShowString(unsigned char Line,unsigned char Column,unsigned char String[]);                            //ÏÔʾ×Ö·û´®
void LCD_ShowNum(unsigned char Line,unsigned char Column,unsigned int Num,unsigned char Length);    //ÏÔʾÎÞ·ûºÅÊý×Ö
void LCD_ShowSignedNum(unsigned char Line,unsigned char Column,int SignedNum,unsigned char Length); //ÏÔʾÓзûºÅÊý×Ö
void LCD_ShowHexNum(unsigned char Line,unsigned char Column,unsigned int Num,unsigned char Length); //ÏÔʾʮÁù½øÖÆÊý
void LCD_ShowBinNum(unsigned char Line,unsigned char Column,unsigned int Num,unsigned char Length); //ÏÔʾ¶þ½øÖÆÊý

#endif

LCD1602.c

#include <REGX52.H>

sbit LCD_RW=P2^5;
sbit LCD_RS=P2^6;
sbit LCD_E=P2^7;
#define LCD_DataPort P0

void LCD_Delay()        //@12.000MHz 1ms
{
    unsigned char i, j;

    i = 2;
    j = 239;
    do
    {
        while (--j);
    } while (--i);
}


int LCD_Pow(int X,int Y)
{
    unsigned char i;
    int Result=1;
    for(i=1;i<Y;i++)
    {
        Result*=X;
    }
    return Result;
}
    
void LCD_WriteCommand(unsigned char Command)
{
        LCD_RS=0;
        LCD_RW=0;
        LCD_DataPort=Command;
        LCD_E=1;
        LCD_Delay();
        LCD_E=0;
        LCD_Delay(); 
}

void LCD_WriteData(unsigned char Data)
{
        LCD_RS=1;
        LCD_RW=0;
        LCD_DataPort=Data;
        LCD_E=1;
        LCD_Delay();
        LCD_E=0;
        LCD_Delay(); 
}


void LCD_SetCursor(unsigned char Line,unsigned char Column)
{
        if(Line==1)
        {
            LCD_WriteCommand(0x80|(Column-1));
        }
        else
        {
            LCD_WriteCommand(0x80|(Column-1)+0x40);
        }
}
 
void LCD_Init(void)
{
        LCD_WriteCommand(0x38);
        LCD_WriteCommand(0x0C);
        LCD_WriteCommand(0x06);
        LCD_WriteCommand(0x01);
}

void LCD_ShowChar(unsigned char Line,unsigned char Column,unsigned char Char)
{
        LCD_SetCursor(Line,Column);
        LCD_WriteData(Char);
}


void LCD_ShowString(unsigned char Line,unsigned char Column,unsigned char String[])
{
        unsigned char i;
        LCD_SetCursor(Line,Column);
        for(i=0;String[i]!='\0';i++)
        {
                LCD_WriteData(String[i]);
        }
}

void LCD_ShowNum(unsigned char Line,unsigned char Column,unsigned int Num,unsigned char Length)
{
    unsigned char i;    
    LCD_SetCursor(Line,Column);
    for(i=Length;i>0;i--)
    {
        LCD_WriteData('0'+Num/LCD_Pow(10,i-1)%10);  //Num³ýÓÚ10µÄ£¨i-1£©´Î·½ÔÙ¶Ô10È¡Óà,½«×Ö·ûת»»³ÉÊý×Ö
    }
}

void LCD_ShowSignedNum(unsigned char Line,unsigned char Column,int SignedNum,unsigned char Length)
{
    unsigned char i;
    unsigned int Num_Cover; 
    LCD_SetCursor(Line,Column);
    if(SignedNum>=0)
    {
        LCD_WriteData('+');
    }
    else
    {
        LCD_WriteData('-');
        Num_Cover=-SignedNum;
    }
    for(i=Length;i>0;i--)
    {
        LCD_WriteData('0'+Num_Cover/LCD_Pow(10,i-1)%10);    //Num³ýÓÚ10µÄ£¨i-1£©´Î·½ÔÙ¶Ô10È¡Óà,½«×Ö·ûת»»³ÉÊý×Ö
    }
}

void LCD_ShowHexNum(unsigned char Line,unsigned char Column,unsigned int Num,unsigned char Length)
{
    unsigned char i;
    unsigned char Num_Cover;
    LCD_SetCursor(Line,Column);
    for(i=Length;i>0;i--)
    {
        Num_Cover=Num/LCD_Pow(16,i)%16;
        if(Num_Cover<10)
        {
            LCD_WriteData('0'+Num_Cover);
        }
        else
        {
            LCD_WriteData('A'+Num_Cover-10);
        }
    }
}

void LCD_ShowBinNum(unsigned char Line,unsigned char Column,unsigned int Num,unsigned char Length)
{
    unsigned char i;
    LCD_SetCursor(Line,Column);
    for(i=Length;i>0;i--)
    {
        LCD_WriteData('0'+Num/LCD_Pow(2,i-1)%2);
    }
}