Re: [9front] Wacom WACF008 glitching on ThinkPad X60/X61 Tablets

[Stanley Lieber <sl@stanleylieber.com>]

On May 29, 2024 5:24:04 AM EDT, cinap_lenrek@felloff.net wrote:
>i said before, you need to capture the bytes going thru the serial here,
>to see what is going on and if we have a chance working around it.
>
>instrument the driver and log the bytes in hex into a logfile,
>with a timestamp.
>
>--
>cinap
>

the reason i didn't do this already is because i don't know how. i triangulated the undesirable behavior and worked around it. badly, yes, which is why i posted here for comments. but what i did do does allow me to draw without glitches, so as a start, at least, i wanted to share this to benefit others struggling with the same behavior. i realize i didn't address the underlying problem.

the bitwise stuff happening in query() and readpacket() looks like gibberish to me. i'm sure it's all quite compact and sensible, but when i look at it, i'm just hearing the teacher from charlie brown. in order to log raw bytes, should i just be dumping the entirety of buf (in readpacket()) to disk? and then how do i interpret it?

i did not have any luck searching for documentation on the protocol this device uses. i did try looking at the linux driver, but again, it's miss othmar all the way down.

thanks,

sl