File content as of revision 0:ef75cadf684d:

#include "mbed.h"

//DigitalOut myled(LED1);

//DigitalOut(PB_3);
//DIgitalOut(PB_12);

//DigitalOut(PA_12);
//DigitalOut(PA_11);
//DigitalOut(PB_3);

DigitalOut red[2]=
{
    PB_3,PB_12,
};

DigitalOut black[3]=
{
    PA_12,PA_11,PB_3,
};


/***************************************
The SetUp function initial all pins. 
****************************************/
int SetUp()
{
    for(int i=0; i<2; i++)
    {
        red[i] = 0;
    }
    
    for(int i=0; i<3; i++)
    {
        black[i] = 1;
    }
    
    return 0;
}

/*****************************
The Open function open a drawer at Row & Col.
1 <= Row <= 2
1 <= Col <= 3
*****************************/       
void Open(int Row, int Col)
{
    SetUp();
    red[Row-1] = 1;
    black[Col-1] = 0;
    wait(0.1);
    SetUp();
}

int main() 
{
    SetUp();
    for(int col=1; col<=3; col++)
    {
        for(int row=1; row<=2; row++)
        {
            Open(row,col);
            wait(0.5);
        }
    }
}