[clue] [TECH] setting the baud rate on a USB serial port

[Jim Ockers]

Hi Dave,

Thanks for the reply.

9600 baud is all the drivers will let me have, but I'm sure the hardware 
is capable of faster speeds than that. These are mobile broadband cell 
phone modem cards intended for multi-megabit internet speeds on the 3G 
and 4G cell phone networks. Furthermore the Qualcomm "Gobi" chipset 
requires firmware to be loaded to init the modem for GSM or CDMA and 
these firmware files are typically 10MB in size. If you had to transfer 
10MB of data at 9600 baud every time you reboot your system or init the 
card that would make the whole thing unusably slow.

...Which is kind of where we are at right now.

Thanks,
Jim

-- 
Jim Ockers, P.Eng. (ockers at ockers.net)
Contact info: http://www.ockers.net/msi.html

David L. Anselmi wrote:
> Jim Ockers wrote:
>   
>> Hi CLUEbies,
>>
>> I'm back in Colorado, yay. But I'm on the Western Slope so not sure I
>> can be physically present at many meetings.
>>     
>
> Welcome back!
>
>   
>> Hey I'm having some trouble with qcserial and setting the baud rate. The
>> ioctl() fails. I'm using OpenWRT Backfire and kernel version "Linux
>> OpenWrt 2.6.32.27 #1 Mon Mar 28 12:05:44 MDT 2011 armv5teb GNU/Linux".
>>     
>
> So is the serial port part of the GSM thingy?  Or do you have a USB->serial dongle that plugs into 
> the GSM?
>
> If the former, is it possible that 9600 is all it supports?
>
> Dave
> _______________________________________________
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> clue at cluedenver.org
> http://cluedenver.org/mailman/listinfo/clue
>   

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