LED控制

led.c

#include <AT89X51.H>
#include <stdio.h>

void delay(int ms);

main()
{
    int i = 0;
    int btnL, btnR;

    //初始化
    P0 = 0xFF;
    P1 = 0xFF;
    P2 = 0xFF;
    P3 = 0xFF;

    while(1)
    {
        P0 = 0xFF; //清除狀態
        delay(10); //延遲讓電力可回傳

        btnL = 0;
        btnR = 0;
        if(!(P0 & 0x01)) btnL = 1;
        if(!(P0 & 0x02)) btnR = 1;

        if(i >= 20) i = 0; //圖像迴圈
        
        if(!btnL && !btnR)
        {
            P2 = 0xFF;
            switch(i % 5)
            {
                case 0:
                    P1 = 0xFE;
                break;
                case 1:
                    P1 = 0xFD;
                break;
                case 2:
                    P1 = 0xFB;
                break;
                case 3:
                    P1 = 0xF7;
                break;
                case 4:
                    P1 = 0xEF;
                break;
            }
        }

        if(btnL && !btnR)
        {
            switch(i % 4)
            {
                case 0: //0      
                    P1 = 0xBF;
                    P2 = 0x9F;
                break;
                case 1: //0+1
                    P1 = 0x9F;
                    P2 = 0x91;
                break;
                case 2: //1
                    P1 = 0xDF;
                    P2 = 0xF1;
                break;
                case 3: //Clear
                    P1 = 0xFF;
                    P2 = 0xFF;
                break;
            }
        }

        if(btnR && !btnL)
        {
            switch(i % 4)
            {
                case 0: //0
                    P1 = 0xDF;
                    P2 = 0xFC;
                break;
                case 1: //0+1
                    P1 = 0x9F;
                    P2 = 0xC4;
                break;
                case 2: //1
                    P1 = 0xBF;
                    P2 = 0xC7;
                break;
                case 3: //Clear
                    P1 = 0xFF;
                    P2 = 0xFF;
                break;
            }
        }

        if(btnL && btnR)
        {
            switch(i % 2)
            {
                case 0:
                    P1 = 0xFF;
                    P2 = 0xFF;
                break;
                case 1:
                    P1 = 0x80;
                    P2 = 0x80;
                break;
            }
        }

        ++i; //圖像推進
		delay(4900); //圖像延遲
    }
}

void delay(int ms)
{
    int i, j;
    for(i = 0; i < ms; ++i)
    {
        for(j = 0; j < 109; ++j)
        {
            ;
        }
    }
}

led.hex

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