Terminal Emulation

Jp Calderone exarkun at intarweb.us
Sun Apr 13 20:48:30 CEST 2003

On Sun, Apr 13, 2003 at 09:40:29AM +0200, Hans-Joachim Widmaier wrote:
> All of my embedded software offers a means of debugging via a serial
> interface. You just hook a terminal onto it and start introspection. These
> days, of course, the "terminal" is usually a computer running a terminal
> emulator, and the embedded software allows you to do more than just view
> memory contents, e. g., download a new software. Of course, I handle this
> download with a python program. Now you have 2 programs: the terminal
> emulator and the download utility. Not too much hassle under unix, as the
> downloader ignores that the serial port is already used by the terminal
> emulator, it just does its job and leaves the port in the same state it
> had found it, the emulator doesn't even notice.
> This doesn't work under Windows, though. So I thought about creating a
> terminal emulator with some added functionality. Some thinking revealed
> that I didn't know a widget that was handy for the job. Some more
> thinking gave me an idea for a unix solution: xterm in slave mode.
> Obviously, this only works where I don't really need it. A google search
> showed that some others also had a use for such a terminal emulation
> widget, but none seems to exist.
> Not knowing wxWindows, pyQt and what-have-you, the Tkinter Text widget is
> about the only thing left. I'd have to grab all keyboard events away from
> it (yuck) and do the escape sequence interpretation by myself (not too
> bad, as I only need a subset of the whole vt100/vt320 stuff). The Text
> widget just seems way too "heavy" for this.
> Handling serial input/output as well as GUI events gives me problems
> enough already. ;-)
> Has anyone found a nicer solution in the meantime? No problems if it meant
> using wxPython or pyGTK. (No pyQt, though, as it's not free under Windows.)

  Paul Swartz has done some work in this area, based off the Tk Canvas
widget, for a "GUI" ssh client he wrote.  The relevant bits are distributed
with Twisted, in the conch/ui package.

  It is very slow, but I think it supports a lot of vt100.  It might be
worth basing your work off of.

  ViewCVS link for the package is 




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