文章目录

一、仿真电路

二、测试程序

2.1 主程序

2.2 LCD1602驱动程序

一、仿真电路

二、测试程序

2.1 主程序

#include <reg52.h>
#include <LCD1602.h>


unsigned char TempBuffer[10];
void IntToStr(unsigned int t, unsigned char* str, unsigned char n)
{
    unsigned char a[5];
    char i, j;

    //取得整数值到数组 
    a[0] = (t / 10000) % 10;        
    a[1] = (t / 1000) % 10;
    a[2] = (t / 100) % 10;
    a[3] = (t / 10) % 10;
    a[4] = (t / 1) % 10;

    // 转成ASCII码 
    for (i = 0; i < 5; i++)                      
    {
        a[i] = a[i] + '0';
    }
    for (i = 0; a[i] == '0' && i <= 3; i++);

    // 填充空格 
    for (j = 5 - n; j < i; j++)                      
    {
        *str = ' ';
        str++;
    }
    for (; i < 5; i++)
    {
        *str = a[i];
        str++;
    }  
    
    // 加入行尾符         
    *str = '\0';
}


void Delay1ms(unsigned int count)
{
    unsigned int i, j;
    for (i = 0; i < count; i++)
        for (j = 0; j < 120; j++);
}


main()
{
    unsigned int Count = 0;
    LCD_Initial();
    GotoXY(0, 0);
    Print("The 1602LCD Test");
    GotoXY(0, 1);
    Print("GO:      ");
    while (1)
    {
        IntToStr(Count++, &TempBuffer[0], 5);
        GotoXY(3, 1);
        Print(&TempBuffer[0]);
        Delay1ms(100);
    }
}

2.2 LCD1602驱动程序

#include <intrins.h>


/********* 端口定义 ***********/
sbit LcdRs  = P2 ^ 0;
sbit LcdRw  = P2 ^ 1;
sbit LcdEn  = P2 ^ 2;
sfr  DBPort = 0x80; // P0=0x80,P1=0x90,P2=0xA0,P3=0xB0.数据端口


/********* 内部等待 ***********/
unsigned char LCD_Wait(void)
{
    LcdRs = 0;
    LcdRw = 1;
    _nop_();
    LcdEn = 1;
    _nop_();
    // while(DBPort&0x80);//在用Proteus仿真时，注意用屏蔽此语句，在调用GotoXY()时，会进入死循环，
    // 可能在写该控制字时，该模块没有返回写入完备命令，即DBPort&0x80==0x80
    // 实际硬件时打开此语句
    LcdEn = 0;
    return DBPort;
}

/********* 写LCD ***********/
#define LCD_COMMAND         0         // Command
#define LCD_DATA            1         // Data
#define LCD_CLEAR_SCREEN    0x01      // 清屏
#define LCD_HOMING          0x02      // 光标返回原点
void LCD_Write(bit style, unsigned char input)
{
    LcdEn = 0;
    LcdRs = style;
    LcdRw = 0;
    _nop_();
    DBPort = input;
    _nop_();//注意顺序
    LcdEn = 1;
    _nop_();//注意顺序
    LcdEn = 0;
    _nop_();
    LCD_Wait();
}


/********* 设置模式 ***********/
#define LCD_SHOW        0x04    // 显示开
#define LCD_HIDE        0x00    // 显示关  
#define LCD_CURSOR      0x02    // 显示光标
#define LCD_NO_CURSOR   0x00    // 无光标     
#define LCD_FLASH       0x01    // 光标闪动
#define LCD_NO_FLASH    0x00    // 光标不闪动
void LCD_SetDisplay(unsigned char DisplayMode)
{
    LCD_Write(LCD_COMMAND, 0x08 | DisplayMode);
}


/********* 输入设置 ***********/
#define LCD_AC_UP   0x02
#define LCD_AC_DOWN 0x00      // default
#define LCD_MOVE    0x01      // 画面可平移
#define LCD_NO_MOVE 0x00      // default
void LCD_SetInput(unsigned char InputMode)
{
    LCD_Write(LCD_COMMAND, 0x04 | InputMode);
}


/********* 初始化 ***********/
void LCD_Initial()
{
    LcdEn = 0;
    LCD_Write(LCD_COMMAND, 0x38);               // 8位数据端口,2行显示,5*7点阵
    LCD_Write(LCD_COMMAND, 0x38);
    LCD_SetDisplay(LCD_SHOW | LCD_NO_CURSOR);   // 开启显示, 无光标
    LCD_Write(LCD_COMMAND, LCD_CLEAR_SCREEN);   // 清屏
    LCD_SetInput(LCD_AC_UP | LCD_NO_MOVE);      // AC递增, 画面不动
}


void GotoXY(unsigned char x, unsigned char y)
{
    if(y == 0)
        LCD_Write(LCD_COMMAND, 0x80 | x);
    if(y == 1)
        LCD_Write(LCD_COMMAND, 0x80 | (x - 0x40));
}

void Print(unsigned char *str)
{
    while(*str != '\0')
    {
        LCD_Write(LCD_DATA, *str);
        str++;
    }
}