51单片机lcd1602滚动显示数字

以下是51单片机LCD1602滚动显示数字的示例代码：

#include <reg51.h>

#define LCD1602_DB P0
sbit LCD1602_RS = P2^6;
sbit LCD1602_RW = P2^5;
sbit LCD1602_E  = P2^7; 

void LCD1602_Delay(unsigned int t);
void LCD1602_WriteCmd(unsigned char cmd);
void LCD1602_WriteData(unsigned char dat);
void LCD1602_Init(void);
void LCD1602_Clear(void);
void LCD1602_ShowStr(unsigned char x, unsigned char y, unsigned char *str);
void LCD1602_ShowNum(unsigned char x, unsigned char y, unsigned int num, unsigned char len);

void main()
{
    unsigned int num = 0;
    unsigned char str[6] = {0};
    LCD1602_Init();
    while(1)
    {
        num++;
        if(num > 9999) num = 0;
        LCD1602_ShowNum(0, 0, num, 4);
        LCD1602_Delay(500);
        LCD1602_Clear();
    }
}

void LCD1602_Delay(unsigned int t)
{
    unsigned int i, j;
    for(i = 0; i < t; i++)
        for(j = 0; j < 100; j++);
}

void LCD1602_WriteCmd(unsigned char cmd)
{
    LCD1602_RS = 0;
    LCD1602_RW = 0;
    LCD1602_E = 1;
    LCD1602_DB = cmd;
    LCD1602_E = 0;
}

void LCD1602_WriteData(unsigned char dat)
{
    LCD1602_RS = 1;
    LCD1602_RW = 0;
    LCD1602_E = 1;
    LCD1602_DB = dat;
    LCD1602_E = 0;
}

void LCD1602_Init(void)
{
    LCD1602_WriteCmd(0x38); // 初始化LCD
    LCD1602_WriteCmd(0x0c); // 打开显示，关闭光标
    LCD1602_WriteCmd(0x06); // 设置输入方式为移动光标，不移动屏幕
    LCD1602_WriteCmd(0x01); // 清屏
}

void LCD1602_Clear(void)
{
    LCD1602_WriteCmd(0x01);
}

void LCD1602_ShowStr(unsigned char x, unsigned char y, unsigned char *str)
{
    unsigned char i;
    if(x < 16)
    {
        if(y == 0) LCD1602_WriteCmd(0x80 | x);
        else if(y == 1) LCD1602_WriteCmd(0xc0 | x);
        for(i = 0; str[i] != '\0'; i++)
            LCD1602_WriteData(str[i]);
    }
}

void LCD1602_ShowNum(unsigned char x, unsigned char y, unsigned int num, unsigned char len)
{
    unsigned char i, j;
    unsigned char str[6] = {0};
    for(i = 0; i < len; i++)
    {
        str[i] = num % 10 + '0';
        num /= 10;
    }
    j = i - 1;
    for(i = 0; i < j; i++, j--)
    {
        str[i] ^= str[j];
        str[j] ^= str[i];
        str[i] ^= str[j];
    }
    LCD1602_ShowStr(x, y, str);
}

示例代码中使用了LCD1602驱动程序，可根据具体情况进行修改。主函数中通过循环不断更新数字，并使用LCD1602_ShowNum函数将数字显示在LCD上。其中LCD1602_ShowNum函数实现了滚动显示数字的功能，通过将数字转换成字符串并逐个显示实现了滚动效果。