Re: Keyboard adapter

On 5/1/05, Daniel Thompson <[email protected]> wrote:
> On Sat, 2005-04-30 at 17:36 -0700, Shaun Jackman wrote:
> > I have a PS/2 keyboard to GameCube joystick port adapter labelled "GC
> > Keyboard & PS Controller Adapter 2 in 1 for GameCube". It works with
> > Action Replay and Phantasy Star Online, but I haven't managed to get
> > it working with Linux. Does this device work with GC Linux? I'm
> > running Linux 2.6.11-isobel-nfs9.
> 
> Try the attached patch.

Thanks for the patch. I haven't yet compiled my own GC kernel, but as
soon as I have I'll get back to you.

In the following line, the right-hand-side is identically zero. 

  		key[2] |= (raw[1] << 28) & 0xFF;

From the surrounding code, I'd guess a right shift was intended.

  		key[2] |= (raw[1] >> 28) & 0xFF;

This would mean though that the bits decoded by key[2] and key[3] overlap.

 		key[2] = ((raw[0] << 4) & 0xFF) | ((raw[1] >> 28) & 0xFF);
		key[3] = (raw[1] >> 24) & 0xFF;

If we label raw[1] as bits 0..31 and raw[0] as bits 32..63 we have

	key[0] = bits 44..51
	key[1] = bits 36..43
	key[2] = bits 28..35
	key[3] = bits 24..31
	key[4] = bits 16..23
	key[5] = bits 8..15

This table shows the overlap of bits 28..31, as well as the undecoded
bits 0..7 and 52..63. Is there any information transmitted in those
undecoded bits?

Cheers,
Shaun


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