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Computer Nerd Kev wrote:
> Dan Purgert <
d...@djph.net> wrote:
>>> [...]
>>> XMODEM breaks the data into 65536 packets of 1024 bytes, and reads a
>>> single byte (ACK) from the target after each packet. The internal packet
>>> buffer is larger than 1 byte, so the chip waits for the latency timer
>>> period before transfering this ACK to the host. This adds 65536 x 16
>>> milliseconds = 17 minutes, which matches the performance I saw!
>>
>> Well, that's slightly problematic (and something to keep tabs on, if I
>> ever use FTDI chips for a project). Granted, I'm kind of "cheap", and
>> those chinese CH-whatever chips one picks up from sparkfun (etc) seem to
>> work just fine; although I can't say I've ever utilized xmodem in my
>> little projects.
>
> Aren't those Chinese chips often FTDI clones? Hence the disaster a
> few years ago when the Windows FTDI drivers were updated and broke
> compatibility with the cloned chips, causing everyone's bargain
> basement USB serial adapters to stop working.
The CH-340 (I think that's the number?) ones I have do not purport
themselves as FTDI devices; at least insofar as I recall. I'd need to
plug it in and re-check the USB-IDs though.
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