File content as of revision 0:c7046f93144e:

#include "mbed.h"
 
Serial pc(USBTX, USBRX); // tx, rx
 
DigitalIn cols[4] = { dp9, dp10, dp11, dp13 }; //kolone
DigitalOut rows[4] = { dp2, dp1, dp28, dp6 }; //redovi
 
 
char getValue()
{
    char c ('N');
    for(int i = 0; i < 4; i++)
    {
        rows[i] = 0;
    }
    
    rows[0] = 1;
    
    for(int i = 0; i < 4; i++)
    {
        if(cols[i] == 1)
        switch(i)
        {
            case 0: 
            c = '1';
            break;
            case 1:
            c = '2';
            break;
            case 2:
            c = '3';
            break;
            case 3:
            c = 'A';
            break;
        }
    }
    rows[0] = 0;
    rows[1] = 1;
    
        for(int i = 0; i < 4; i++)
    {
        if(cols[i] == 1)
        switch(i)
        {
            case 0: 
            c = '4';
            break;
            case 1:
            c = '5';
            break;
            case 2:
            c = '6';
            break;
            case 3:
            c = 'B';
            break;
        }
    }
    
    
    rows[1] = 0;
    rows[2] = 1;
    
    for(int i = 0; i < 4; i++)
    {
        if(cols[i] == 1)
        switch(i)
        {
            case 0: 
            c = '7';
            break;
            case 1:
            c = '8';
            break;
              case 2:
            c = '9';
            break;
            case 3:
            c = 'C';
            break;
        }
    }
    
    
    rows[2] = 0;
    rows[3] = 1;
    
        for(int i = 0; i < 4; i++)
    {
        if(cols[i] == 1)
        switch(i)
        {
            case 0: 
            c = '*';
            break;
            case 1:
            c = '0';
            break;
            case 2:
            c = '#';
            break;
            case 3:
            c = 'D';
            break;
        }
    }
    
    rows[3] = 0;
    return c;
}
 
 
    
int main() {
    char c = 'N';
    char c1;
 
    while(1) {
    c1 = getValue();
 
    if ( c1 != 'N' && c == 'N')
    {
        if (c1 == '*')
        pc.putc ('\n'); 
        else pc.putc(c1);
                   
    }
    c = c1;
    }
}