树莓派-轮盘游戏机设计

　　浙大嵌入式课程实验。

　　在实验板 的 Linux 上做一个轮盘游戏机，具有两个按钮，一个负责启动，一 个负责停止。具有某个或 多个输出设备,如 LED 柱状显示器、 双位 7 段数码管（不要求输出数字）、LCD或舵机 等，可任选其中一个或多个的 组合。按下启动按钮，输出设备上就出现各种变化，如流水灯、舵机的旋转等；按下停止按 钮，输出设备就固定在当时 的状态上。程序运行的过程，会在 shell 输出数据。程序必须用 C/C++语言写。

　　布线方案如下：

　　在面包板上连线，完成外部电路：

　　wiringPi是一个成熟的树莓派平台的GPIO控制库函数，我们可以通过安装wiringPi来控制树莓派的GPIO：

　　进入目录build

查看是否安装成功

wiringPi的接口映射：

本次试验用到的LG3641BH数码管的引脚：

共阳数码管管脚定义：

数码管焊板图：

测试程序：

#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>

#define DIGIT1 8
#define DIGIT2 12
#define DIGIT3 13
#define DIGIT4 9
#define BTN0 10
#define BTN1 11

#define true 1
char digit[10][8] =  //The increasing number
    {
        {0,1,0,1,0,0,0,0}, //0
        {1,1,0,1,1,1,0,1}, //1
        {0,0,0,1,0,1,0,0}, //2
        {0,0,0,1,0,1,0,1}, //3
        {1,0,0,1,1,0,0,1}, //4
        {0,0,0,1,0,0,1,1}, //5
        {0,0,0,1,1,0,1,0}, //6
        {1,1,0,1,0,1,0,1}, //7
        {0,0,0,1,0,0,0,0}, //8
        {0,0,0,1,0,0,0,1}  //9
    };
char loop[10][8] =   //the loop-running bar in the left windows
    {
        {1,1,1,1,0,1,1,1},//chip1
        {1,1,1,1,0,1,1,1},//chip2
        {1,1,1,1,0,1,1,1},//chip3
        {1,1,1,1,1,1,0,1},//chip3
        {1,1,0,1,1,1,1,1},//chip3
        {0,1,1,1,1,1,1,1},//chip3
        {0,1,1,1,1,1,1,1},//chip2
        {0,1,1,1,1,1,1,1},//chip1
        {1,1,1,1,1,1,1,0},//chip1
        {1,1,1,1,1,0,1,1},//chip1
    };

void main()
{
    int pin;
    int m = 0, n = 0;
    int flag = 1;
    int chip = 0;
    int run = 0;
    unsigned int time0 = 0, time1 = 0;

    if (wiringPiSetup () == -1) //test the install status of wiringPi
    {
        exit (1) ;
    }

    for (pin = 0 ; pin < 8 ; ++pin)
    {
        pinMode (pin, OUTPUT) ;
        digitalWrite(pin, HIGH);
   }

    pinMode(DIGIT1, OUTPUT);
    pinMode(DIGIT2, OUTPUT);
    pinMode(DIGIT3, OUTPUT);
    pinMode(DIGIT4, OUTPUT);
    pinMode(BTN0, INPUT); //The start button
    pinMode(BTN1, INPUT); //The stop button

    while (true)
    {
        time1 = millis();

        if (digitalRead(BTN0) && run == 0)
        {
            puts("Start!");
            run = 1;    //change the running state
            m = 0;
            n = 0;
            chip = 0;
            time0 = millis();
        }
        else if (digitalRead(BTN1) && run == 1)
        {
            puts("Stop!");
            run = 0;
       // chip = m =n = 0;
        }

        if (time1 - time0 >= 50 && run == 1)
        {
            time0 = time1;
//            printf("%d\n", n);
            m = ++m % 10;
            n = ++n % 10;
        chip = ++chip % 10;
        printf("%d\n", n);
        }

        for (pin = 0; pin < 8; pin++)
        {
            digitalWrite(pin, 1-flag ? digit[n][pin] : loop[m][pin]);
        }
        switch(chip){
        case 7:
        case 8:
        case 9:
        case 0:digitalWrite(DIGIT4, flag);
                //digitalWrite(DIGIT3, 0);
                //digitalWrite(DIGIT4, 0);
               break;
        case 6:
        case 1:digitalWrite(DIGIT3, flag);
               //digitalWrite(DIGIT2, 0);
               //digitalWrite(DIGIT4, 0);
               break;
        case 3:
        case 4:
        case 5:
        case 2:digitalWrite(DIGIT2, flag);
               //digitalWrite(DIGIT2, 0);
               //digitalWrite(DIGIT3, 0);
               break;
        default:break;
        }
   　　 //chip = (chip + 1)%10;
        //digitalWrite(DIGIT4, flag);
        digitalWrite(DIGIT1, (flag = 1 - flag));
     　　delay(30);
     　　digitalWrite(DIGIT1,0);
     　　digitalWrite(DIGIT2,0);
     　　digitalWrite(DIGIT3,0);
     　　digitalWrite(DIGIT4,0);
        //delay(30);
    }

}

程序运行，在窗口中循环输出数字0-9，两个按钮分别控制开始和暂停，四个数码管左边三个设计成为跑马灯，右边一个循环显示数字0-9。

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