Problems with USB to serial adaptor

[David Backeberg]

I don't know anything about gdb, but judging by your input and your error 
message, does gdb ignore the first / in /dev/ttyUSB? Is / the character 
that indicates you're feeding an argument, like - with ls -l?

Do you need to say something like
(gdb) target /rdi //dev/ttyUSB

Another idea:
do you need to use gdb at all? Can you just read raw output from 
/dev/ttyUSB? It should be a file device, like anything else that hides out 
in /dev

Maybe you can just do
cat /dev/ttyUSB
and redirect the output to a log you can pick through later.

I don't know anything about your device. Is it expecting input on the 
serial device, or does it just dump debugging info to serial? Has somebody 
created a proprietary communications method, which requires their binary? 
Did they wire the pins in a nonstandard way, and you have to get their 
connector or wire your own interface? This would be a good time to dig 
through the docs for the device.

If this device is compatible with minicom, you still need to know which 
modem settings to try.

-- 
David Backeberg (dave at math.mit.edu)
Network Staff Assistant
MIT Math Dept.
Rm. 2-332            (617) 253-4995

On Sat, 29 Jan 2005, David Kramer wrote:

> I'm using a Prolific PL2303HX-based Sewell USB to serial cable to go from
> my laptop to an ARM7 embedded development board. The adapter talks ok to a
> modem and other devices, so I know I have the device and the permissions
> right.
>
> When I try to talk to the board through the cross-platform version of the
> gdb debugger, arm-elf-gdb, I get:
>
> (gdb) target /rdi /dev/ttyUSB0
> (gdb)
> Could not open device "dev/ttyUSB0"
>
> I've tried it both as root and as a mortal.
>
> What tools do people use to work with serial port problems?  I fooled
> around with setserial, but it seemed rather displeased at the device,
> saying "Cannot get serial info: Invalid argument".  I tried fooling around
> with Minicom, but it REALLY REALLY wants to talk to a modem, and doesn't
> want to let me talk to the serial port until I've dialed a number.
>
> Any clues?
>
>
> Thanks.
>
>
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