AVR-Chat

On Mon, Dec 20, 2004 at 12:06:39AM -0500, wbounce wrote:

> This leads me to my 2nd question. I have debug print statements to the
> UART. Today I added a define efkdebug and put #ifndef efkdebug around
> the code that actually sends the charactors to the uart so I would not
> have to wait for them to timeout. Right now my define variable is
> hardcoded. I would like to set up a new menu item in PN called Build
> Debug and be able to have the Make file set the efkdebug define.  I know
> there is a compiler command line option -D or -d that allows the
> defining a variable. But how do I have PN pass the make file a parameter
> that tells it to define debug. Working with make files is not my strong
> suite. From what I read any variables are global. I only want to set it
> if I am doing a build debug.

You can pass Makefile variables on the 'make' command line, like this,
for example:

    make CPU_FREQ=16000000

Then, in your Makefile, you can pass that on to your C compiler by
adding this to your C command line, either directly, or by adding it
to typically the CFLAGS variable, i.e.,:

    CFLAGS   += -DCPU_FREQ=${CPU_FREQ}

Be sure that comes _after_ any direct assignment of CFLAGS, otherwise
your addition will be overwritten.

Or more directly to the C compiler command line, i.e.:

    avr-gcc -DCPU_FLAGS=${CPU_FREQ} ...

If your variable can have spaces, be sure and use quotes as necessary.

Sorry I can't help with the others.

-Brian
-- 
Brian Dean
BDMICRO - ATmega128 Based MAVRIC Controllers
http://www.bdmicro.com/