[PD-dev] HID names, numbers and tables

[Hans-Christoph Steiner]

I used the names from Linux's input.h.  The event naming scheme is  
derived from Linux rather than USB because its much cleaner.  I guess  
that makes it less than pure "HID" because the Linux input system is  
HID plus ADB, PS/2, serial mice, AT, etc.

The names in [hid] could probably use a revamp.  I chose deliberately  
short names because I thought strcmp() was used to compare the strings,  
but since Matju pointed out that symbol comparison is done by the  
pointer, the length of the symbol name won't affect comparison speed.   
But if the names are too long, they'll take up a lot of screen space.

As for less parsing, one of these days, I'll get around to making the  
OS-specific versions of [hid] which will just dump the data straight  
out from the OS without any cross-platform concerns.  That might help  
with the sensor setups.

.hc

On Jul 6, 2005, at 1:29 PM, Christian Klippel wrote:

> hello all,
>
> as for the recent discussion about the [hid] object, i just have  
> uploaded two
> pdf documents to my site:
>
> http://mamalala.de/Hut1_11.pdf - HID Usage Tables
> http://mamalala.de/HID1_11.pdf  - HID Specs
>
> of most interrest here are the usage tables, i think.
>
> as you can see there, there is a number of choices how single number
> (event-type) is  mapped to the hid-name. it all depends on the  
> selected usage
> tables.
>
> btw, i would say that it is a good idea to use the names as specified  
> in that
> document. after all, its how that standard is defined.....
>
> and i agree that hid is of limited use when it comes to many
> sensors/actuators. the problem is that all the data is parsed (as  
> defined in
> the descriptors) in the hid driver of the os once, and a second time
> inside/after the [hid] object.
>
> greetings,
>
> chris
>
>
>
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