Re: [Paparazzi-devel] Hello!

[antoine]

Hi Shakeel

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On 2003.11.09 11:51 Ahmad Shakeel wrote:
> Hi all!
>
> I am an R/C pilot and want to make an autopilot for my
> trainer. I am really inspired by the paparazzi project
> and this is a very good attempt to make a uav.

Thanx a lot :)

> I am new to AVR development and programming and also
> to gcc. I need some basic "How to" for the programming
> environment under linux and gcc. In the past I have
> programmed some basic MCUs like 8051 but have no
> experience with AVRs. For 89C51 we have one .c or .cpp
> file when compiled produces a .hex file which is
> downloaded to the eprom of the MCU but here I have
> seen that there are may files under one directory and
> one MakeFile that is used for compilation. How the
> MakeFile can include and compile all the .c files in
> one hex file?

here, each .c file will produce a .o (object file)
use a command like

avr-gcc -Wall -mmcu=atmega128 -r -o test.o test.c

The -Wall option tells the compiler to produce all warnings. The -r option 
tells the compiler not to link
The -o option tells him the name of the file you want to generate


Then you can link one or several object files in a .elf
use a command like

/usr/local/atmel/bin/avr-gcc -mmcu=atmega128 -o test.elf test1.o test2.o


Then you can convert the .elf in .hex with a command like

avr-objcopy -O ihex test.elf test.hex


"Make" will allow you to avoid typing these tedious commands.
You give him a set of rules describing how to produce a .o from a .c, a 
.elf from .o, etc...
Based on modification time of files, make will then find which files need 
to be recompiled and execute required commands.

you can type "info make" to get details about make.
I admit the syntax is a little confusing, so you should start by modifying 
existing Makefiles.
You can use the ones in our CVS

> Also is there any complete system overview diagram
> available for the paparazzi?

Maybe you can look at the slides 
(http://www.nongnu.org/paparazzi/slides_962624.pdf) from the journées 
microdrone (sorry they are in french).

hth

Antoine