File content as of revision 0:768dd398f2b8:

#include "mbed.h"
#include "platform/mbed_thread.h"

int main()
{
    int a=0x40, b=0x80, c=0xc0, d=0x00; // a一行目0100=4, b二行目1000=8, c三行目1100=c, dはfield 0000=0
    DigitalIn sw1_1(PC_5);
    DigitalIn sw1_2(PA_12);
    DigitalIn sw1_3(PA_11);
    a=a+sw1_1.read() * 100+  sw1_2.read() * 10 +  sw1_3.read();

    DigitalIn sw2_1(PB_12);
    DigitalIn sw2_2(PB_11);
    DigitalIn sw2_3(PB_2);
    DigitalIn sw2_4(PB_1);

    DigitalIn sw3_1(PB_15);
    DigitalIn sw3_2(PB_14);
    DigitalIn sw3_3(PB_13);

    DigitalIn sw_field(PC_4);
//ここまでは、ピンの設定

    sw1_1.mode(PullUp);
    sw1_2.mode(PullUp);
    sw1_3.mode(PullUp);


    sw2_1.mode(PullUp);
    sw2_2.mode(PullUp);
    sw2_3.mode(PullUp);
    sw2_4.mode(PullUp);

    sw3_1.mode(PullUp);
    sw3_2.mode(PullUp);
    sw3_3.mode(PullUp);

    sw_field.mode(PullUp);
//ここまでは、ピンのモード

    a=a+sw1_1.read() * 100+  sw1_2.read() * 10 +  sw1_3.read();
    b=b+sw2_1.read() * 1000+  sw2_2.read() * 100 +  sw2_3.read()*10 + sw2_4.read();
    c=c+sw3_1.read() * 100+  sw3_2.read() * 10 +  sw3_3.read();
    d=d+sw_field.read();

    printf("%x\r\n", a);
    printf("%x\r\n", b);
    printf("%x\r\n", c);
    printf("%x\r\n", d);