fez-panda-ii-with-matrix-keypad-2

Keypad.cs

public char[] GetKeys()
{
    var s = "";

    for (var i = 0; i < ColumnPins.Length; i++)
    {
        using (var output = new OutputPort(ColumnPins[i], false))
        {
            for (var j = 0; j < RowPins.Length; j++)
            {
                using (var row = new InputPort(RowPins[j], false, Port.ResistorMode.PullUp))
                {
                    if (!row.Read())
                        s += Keymap[j][i];
                }
            }
            output.Write(true);
        }
        using (var input = new InputPort(ColumnPins[i], false, Port.ResistorMode.Disabled))
        {
        }
    }

    char[] result = new char[s.Length];
    for (var i = 0; i < s.Length; i++)
        result[i] = s[i];

    if (result.Length > 0)
        System.Threading.Thread.Sleep(HoldTime);
    return result;
}