Arduino / C Keypad Library use Byte in keymap
<p>When I press a key on a matrix I need to send the corresponding hex value to a function. Is there any way to use a <code>byte</code> matrix for the keymap instead of a <code>char</code> one? I've tried just changing the variable type of the matrix (seen bellow) but I get all kinds of errors...</p>

<pre><code>byte keys[ROWS][COLS] = {
  {0xE1, 0x05, 0x06},
  {0x07, 0x08, 0x09},
  {0x0A, 0x0B, 0x0C},
};
</code></pre>