________________________________
From: Rogier Wolff <[email protected]>
Sent: Friday, January 18, 2019 8:11 AM
To: [email protected]
Subject: Re: Any exported way to set read timeout or query receive buffer?
On Fri, Jan 18, 2019 at 04:05:29PM +0100, Thomas Jarosch wrote:
> Hi Uwe,
>
> You wrote on Mon, Dec 17, 2018 at 04:56:09PM +0100:
> > For a user programm to determine if a connected FTDI device has the 60
> > MHz clock option (e.g. FT2232H) or not (e.g. FT2232D), I only see on
> > way:
> > - Send the Disable Clk Divide by 5 command (0x8a)
> > - Observe if the command is accepted or not.
>
> any chance to detect the device by USB PID
> or serial number, product description?
When a new device is introduced that is mostly compatible with an
earlier version, there is pressure to use the old PID/VID. This will
cause existing drivers and applications to automatically pick up the
new device. On the other hand, chosing a new PID will mean that
existing drivers have to be patched to now also accept the new PID.
But after a while, having a new PID becomes nice. The software can
use/workaround quirks caused by the different devices.
I would think it quite possible that FTDI occasionally makes the wrong
decision (use old PID) instead of the right one (always issue a new
PID).
Was this for a generic or a custom device? If it's custom, then I suggest
implementing a configuration flash eeprom which can take custom manufacturer
and product ID strings. Then it's obvious which device you are working with.
Paul
Roger.
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