Objective Development Forums

Hi,

in order to change the AVR-Doper firmware version number I had to recompile the firmware. While doing so, I encountered a few problems:

When compiling with WinAVR20080402RC1 I get a few warnings:

../hardware.h:50:1: warning: "F_CPU" redefined
=> can be removed by commenting out the lines

../stk500protocol.c:137: warning: pointer targets in passing argument 1 of 'strcpy_P' differ in signedness
=> serious???

Anyway, when I flash the generated code ignoring the warnings, everything worked at first sight, but when I use AVR-Doper in HV-Mode, it looses USB connection during the flashing process. The originally provided hex works fine, though.

I also have installed an old version WinAVR20060421

here I get a different warning:
../timer.h:44: warning: comparison is always false due to limited range of data type
=> haven't tested the generated code on AVR doper.

Question:
-Which compiler version is the originally provided hex built with?
-Can the firmware successfully and functionally be built with new WinAVR versions? If so, how?

Thanks, Tom

The bundled hex file was built with gcc 3.4.6.

The warnings you get suggest that you are not using the Makefile which ships with AVR-Doper. For the new WinAVR, the redefintion of F_CPU indicates that you pass it on the compiler command line (we have it in hardware.h in this project).

And the "comparison is always false" warning indicates that you use a "char is unsigned" option for the compiler. This is not in our original Makefile.

Thanks for the hints! I use AVR Studio to compile the firmware and missed to check tese options.

Now the code compiles with zero warnings and runs properly!