[U-Boot-Users] Up-arrow and Down-arrow related Query
wd at denx.de
Fri Jan 12 17:52:44 CET 2007
In message <1168625193.1678.23.camel at Kamesh> you wrote:
> I'm using u-boot for our custom board.
> We are customizing the Cmd Line interface of U-Boot
> to suit our needs.
Start trying to understand what's already present...
> The Up-Arrow & Down-Arrow keys don't function the way
> they do in Bash Shell prompt.
Umm... it seems you are somewhat confused about functions of the
terminal emulation running on your host computer and the imput
processing in U-Boot.
In the standard configuration, there is no such thing as "Up-Arrow"
or "Down-Arrow" keys - U-Boot is reading a character stream, and tere
is no such characters in the usedC (= ASCII) character set.
However, you can enable command completion, commandline editiong and
history functions by enabling these in your board configuration.
Then, and only then, will U-Boot respond to certain character
> The Up-Arrow takes the cursor up the screen thru the previous
> prompt lines. Where is this Up-Arrow functionality defined ?
In the terminal emulation program running on your host system. U-Boot
is just echoing the characters in your input.
> I chkd the readline() function in common/main.c, but that does
> not take care of Up & Down arrows in Switch - Case stmts.
It does not ven know that such things might exist.
> I need to know where the Up and Down arrow key press
> functionalities are defined.
You repeat yourself.
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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