26 Jul
2015
26 Jul
'15
12:15 p.m.
On 07/26/2015 06:12 AM, tony duell wrote:
The first USB devices were utterly terrible--I've got a few that work
only with certain controllers--modern controllers are absolutely blind
to the things.
It seems to me (and I'll defer to more experienced hands) that USB is
not wonderful for single- or low-count byte transfers; that the
negotiation overhead makes short transfers rather problematic,
particularly where the topology involves multiple hubs. In other words,
USB is well-suited to block transfers.
Is this a fair assessment?
And the proliferation of unofficial VID and PIDs seems to be an issue,
particularly with Chinese-origin devices. "Squatting" seems to be a
practice also: VID 0001 = Fry's Electronics; 0004 = Nebraska Furniture
Mart--really? I've found Chinese USB devices squatting on the Linksys
VID, with a non-Linksys PID.
Really, it's a mess.
--Chuck
Remember when USB was referred to as the Useless Serial Bus after
it was introduced? I think it was a solid 1-2 years after it was
introduced that I began to notice peripherals designed for it.
I still call it 'Useless Serial Botch' most of the time. It's not a
bus, after all.