树莓派GPIO口基于中断的跑马灯

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这是一个浙江大学嵌入式课程作业，将两个开关与几个LED灯接入树莓派的GPIO口。开关控制游戏的开停，LED灯则被轮流点亮。在这次作业里面我用了中断。

实物图（其实毛线都看不清楚）

用fritzing画的图（第一次画丑了一些）

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#include <wiringPi.h>
#include <stdio.h>
#define BTN1 5
#define BTN2 4

int running = 0, currentLed = 0;
const int leds[] = { 1, 0, 2, 3 };

void btn1Up() {
    delay(20);
    if (digitalRead(BTN1)) {
        printf("Game Start\n");
        running = 1;
    }
}

void btn2Up() {
    delay(20);
    if (digitalRead(BTN2)) {
        printf("Game Stop\n");
        running = 0;
    }
}

void shutdownAll() {
    for (int i = 0; i != sizeof(leds) / sizeof(int); ++i)
        digitalWrite(leds[i], LOW);
}

int main (void)
{
    wiringPiSetup();
    pinMode(BTN1, INPUT);
    pinMode(BTN2, INPUT);
    pullUpDnControl(BTN1, PUD_DOWN);
    pullUpDnControl(BTN2, PUD_DOWN);
    wiringPiISR(BTN1, INT_EDGE_RISING, &btn1Up);
    wiringPiISR(BTN2, INT_EDGE_RISING, &btn2Up);
    for (int i = 0; i != sizeof(leds) / sizeof(int); ++i) {
        pinMode(leds[i], OUTPUT);
        pullUpDnControl(leds[i], PUD_UP);
    }

    for( ; ;) {
        delay(100);
        currentLed = (currentLed + 1) % (sizeof(leds) / sizeof(int));
        shutdownAll();
        if (running)
            digitalWrite(leds[currentLed], HIGH);
    }
    return 0 ;
}