帮我用c语言写一个单片机跑马灯程序

好的，以下是一个基本的单片机跑马灯程序（以STC89C52RC为例）：

#include <reg52.h>

sbit LED1 = P1^0;
sbit LED2 = P1^1;
sbit LED3 = P1^2;
sbit LED4 = P1^3;
sbit LED5 = P1^4;
sbit LED6 = P1^5;
sbit LED7 = P1^6;
sbit LED8 = P1^7;

void Delay(unsigned int i)
{
    while(i--);
}

void main()
{
    unsigned char i = 0;

    while(1)
    {
        LED1 = LED2 = LED3 = LED4 = LED5 = LED6 = LED7 = LED8 = 0;
        Delay(10000);

        for(i = 0; i < 8; i++)
        {
            switch(i)
            {
                case 0:
                    LED1 = 1;
                    break;
                case 1:
                    LED2 = 1;
                    break;
                case 2:
                    LED3 = 1;
                    break;
                case 3:
                    LED4 = 1;
                    break;
                case 4:
                    LED5 = 1;
                    break;
                case 5:
                    LED6 = 1;
                    break;
                case 6:
                    LED7 = 1;
                    break;
                case 7:
                    LED8 = 1;
                    break;
            }

            Delay(10000);
            LED1 = LED2 = LED3 = LED4 = LED5 = LED6 = LED7 = LED8 = 0;
        }

        for(i = 7; i >= 0; i--)
        {
            switch(i)
            {
                case 0:
                    LED1 = 1;
                    break;
                case 1:
                    LED2 = 1;
                    break;
                case 2:
                    LED3 = 1;
                    break;
                case 3:
                    LED4 = 1;
                    break;
                case 4:
                    LED5 = 1;
                    break;
                case 5:
                    LED6 = 1;
                    break;
                case 6:
                    LED7 = 1;
                    break;
                case 7:
                    LED8 = 1;
                    break;
            }

            Delay(10000);
            LED1 = LED2 = LED3 = LED4 = LED5 = LED6 = LED7 = LED8 = 0;
        }
    }
}

该程序中，我们使用了P1口的8个引脚来控制8个LED灯，实现了一个基本的跑马灯效果。程序中的`Delay`函数用于延时，可以根据需要自行调整。