Conversion of the Project to C++

[bsd040]

Posted on January 26, 2009 at 13:57

Conversion of the Project to C++

[st3]

Posted on May 17, 2011 at 13:00

Quote:

warning: variable ''__vector_table'' was declared but never referenced.

So remove the declaration!

[bsd040]

Posted on May 17, 2011 at 13:00

Hello,

I am writing a firmware for STM32F10x microcontroller.

I try to convert my project to C++.

When I build the project, the compiler gives me the following warning message in file stm32f10x_vetor.c:

warning: variable ''__vector_table'' was declared but never referenced.

Please help.

Thanks in advance.

[bsd040]

Posted on May 17, 2011 at 13:00

Quote:

On 22-01-2009 at 13:29, Anonymous wrote:

Quote:

It will not solve the problem.

It will solve the problem that you stated; viz, the ''declared but not used'' compiler warning.

Quote:

I need the vector table in flash memory in order to be able to handle the interrupts

So the real problem is, ''How to specify the interrupt vectors in C++''

You could, of course, just avoid that problem by sticking with 'C'... 8-)

Why do you specifically want to convert an existing application to C++ ??

I can understand starting a new one in C++ - but why convert an existing one?! :-?

It is actually a new program. I would like to use IAR

Firmware Library, which is written in C and to add my

own code which will be, as I hope, written in C++.

C++ is much more modular and convinient language, for my opinion.

I understand that you know English better than me, however, I think

that it is not the main issue. If you know the solution, please help.

[st3]

Posted on May 17, 2011 at 13:00

Quote:

It will not solve the problem.

It will solve the problem that you stated; viz, the ''declared but not used'' compiler warning.

Quote:

I need the vector table in flash memory in order to be able to handle the interrupts

So the real problem is, ''How to specify the interrupt vectors in C++''

You could, of course, just avoid that problem by sticking with 'C'... 8-)

Why do you specifically want to convert an existing application to C++ ??

I can understand starting a new one in C++ - but why convert an existing one?! :-?

[bsd040]

Posted on May 17, 2011 at 13:00

It will not solve the problem.

I need the vector table in flash memory in order to be able to handle the interrupts. :-?

[bsd040]

Posted on May 17, 2011 at 13:00

Thank you very much for your reply, Peter.

I tried to put the definitions of the functions in file stm32f10x_it.c

to Extern ''C'' block. Then I've changed the name of the file to stm32f10x_it.cpp. Compiler enforced me also to put the function declarations in ''stm32f10x_it.h'' file into Extern ''C'' block.

When I did it, the compiler still gave me the same warning message :

Warning[Pe177]: variable ''__vector_table'' was declared but never referenced :-[ .

I did not touch stm32f10x_vector.c, as you said.

May be there is something else you did in your project?

[peter2]

Posted on May 17, 2011 at 13:00

Hi,

we just left the file stm32f10x_vetor.c as it is. We only changed the definitions of the interrupt functions in the file stm32f10x_it.c to extern ''C'' and the file itself to stm32f10x_it.cpp.

This works for us.

An other solution could be to define the vector table as volatile:

volatile const intvec_elem __vector_table[] =

But in my opinion it is best not change the whole library to c++. It is best to use it with extern ''C'' in your c++ App.

[st3]

Posted on May 17, 2011 at 13:00

Quote:

Then I've changed the name of the file to stm32f10x_it.cpp.

That's probably a bad idea:

The compiler may well assume that the .cpp extension means that the file has to be compiled as C++

Quote:

I did not touch stm32f10x_vector.c

Yes you did - you changed its name!

It really sounds like you are fighting too many unknowns here:

Wouldn't you find it easier to start in 'C' until you are fully familiar with how everything hangs together, then move on to C++ (if you still feel the need) once you've laid some solid foundations?