Can't even get mouse id

pcmattman · Post by **pcmattman** » Fri Feb 02, 2007 12:57 am

I'm trying to set up PS/2 Mouse support in my OS, but can't even get the mouse ID... All it returns is 0xFFFF, and I assume that means that there is a problem? Nasm code:

Code: Select all

; gets the mouse id and puts it into ax
GetMouseID:

	mov al,0xF2		; mouse ID command (8042)
	call SendToChip		; send it

	in ax,60h

	ret

AX only holds 0xFFFF after this function. Any ideas?

os64dev · Post by **os64dev** » Fri Feb 02, 2007 2:03 am

could you also post the code for SendToChip? it might give some additional info.

regards

pcmattman · Post by **pcmattman** » Fri Feb 02, 2007 2:12 am

The code (NASM):

Code: Select all

; sends a command to the 8042 microchip controller
SendToChip:

	push cx
	push ax

	cli

	xor cx,cx

	scWaitEmpty:

		in al,64h
		test al,10b
		loopnz scWaitEmpty

	pop ax
	out 64h,al
	sti
	pop cx

	ret

It's all real-mode.

pcmattman · Post by **pcmattman** » Fri Feb 02, 2007 5:03 am

Update: I can now enable/disable the device and do tests on it. The problem is, I've put in code to set streaming mode on the mouse hardware. It should acknowledge with a 0xFA (ack) or a 0xFE (resend). The problem is, I seem to be getting information from the keyboard not from the mouse. Any ideas?

Seven11 · Post by **Seven11** » Sat Feb 03, 2007 8:45 am

you might need to wait some time before the keyboard/mouse replies, my code wait's up to 5 seconds (this was one of the problems I had with the mouse in bochs).

xsix · Post by **xsix** » Sat Feb 03, 2007 1:40 pm

i think you should check that controller has data before IN AX, 0x60