2011-02-01 06:33:16 USB Serial Gadget speed
Nikolay Chokoev (IRELAND)
Message: 97840
Hi,
Does the USB Serial Gadget emulates the actual RS232 baudrate (set by tcsetattr() for ex)?
What is the maximum supported speed (or what it depends on) ?
Regards,
Nikolay
QuoteReplyEditDelete
2011-02-01 11:13:48 Re: USB Serial Gadget speed
Mike Frysinger (UNITED STATES)
Message: 97846
please review the documentation:
linux-2.6.x/Documentation/usb/gadget_serial.txt
QuoteReplyEditDelete
2011-02-01 12:19:47 Re: USB Serial Gadget speed
Nikolay Chokoev (IRELAND)
Message: 97847
It says "--these settings mostly do not matter.", but it looks like they don't matter at all.
If that's the case what is the speed it's running at? What's the maximum speed one can get and what it depends on?
QuoteReplyEditDelete
2011-02-01 12:22:25 Re: USB Serial Gadget speed
Mike Frysinger (UNITED STATES)
Message: 97848
if the documentation doesnt explain it, then the source is the documentation. i dont think we've looked at either of these aspects before. i imagine it simply fills the USB pipe rather than putting useless artificial delays in.
QuoteReplyEditDelete
2011-02-02 04:31:59 Re: USB Serial Gadget speed
Nikolay Chokoev (IRELAND)
Message: 97868
Thanks Mike. I just was wondering if somebody already looked at it. I think, as well, it doesn't put any delays, but there is an overhead running RS232 over the USB probably and the speed depends on what USB transfers are used (I suppose bulk). Probably the best way is to look at the sources...
Best regards,
Nikolay
QuoteReplyEditDelete
2011-02-02 15:20:17 Re: USB Serial Gadget speed
Mike Frysinger (UNITED STATES)
Message: 97871
i dont know what your needs are, or what gadget driver you're using exactly, but there are "f_acm" and "f_serial" drivers. the former tends to be more compatible with devices while the latter tends to be less overhead (that's my understanding). if these still arent fast enough, you could try using the ethernet gadget ...