c++ language for AVR?

[7rots51]

intitle:c++ language inurl:viewtopic

Hi
If we use C/C++ IAR compiler for AVR.

What is the advantage of using c++ object oriented programming for AVR embedded designs?Can it solve some problems easily that is difficult to solve with C?Does c++ reduces the number of program lines?

what is your experience? :?

Regards

 

[Antharax]

avr c oop

In my oppinion (but i'm not speaking out of experience with C++ in AVR) it's dangerous to use C++ for uC's. I guess the biggest problem is Memory allocation! You need to keep track of the memory you use since it's probably limited.
I also think code size is a bit bigger (after compilation, perhaps you can write smaller code) but this is an assumption.
I think if you're gonna use operator overloading, templates, streams, Inheritance with virtual functions, ... you have to have a good idea of what your doing. (If there is a C++ compiler for AVR that supports these things) Small memories are probably the biggest enemy of Object Oriented design.
For the moment i try use only a subset of the C standard library for AVR, eg not the scanf or sprintf methods since they increase compiled code size allot (3 to 5 kB)

Antharax

 

[stevejack]

scanf iar avr

a couple of months ago I started with AVR and c++. It's rather painful adventure, but now most of things seems to work. So I decided to share my little experience, maybe it will be useful for you.

 

[_pv]

c++ avr

Take a look on scmRTOS project.
http://scmrtos.sourceforge.net
it is a real-time OS for written in C++.

 

[yasir0403]

object oriented avr

stevejack have you tried C++ coding for AVR in IAR compiler?

 

[simonpe]

In my oppinion (but i'm not speaking out of experience with C++ in AVR) it's dangerous to use C++ for uC's. I guess the biggest problem is Memory allocation! You need to keep track of the memory you use since it's probably limited.
I also think code size is a bit bigger (after compilation, perhaps you can write smaller code) but this is an assumption.
I think if you're gonna use operator overloading, templates, streams, Inheritance with virtual functions, ... you have to have a good idea of what your doing. (If there is a C++ compiler for AVR that supports these things) Small memories are probably the biggest enemy of Object Oriented design.
For the moment i try use only a subset of the C standard library for AVR, eg not the scanf or sprintf methods since they increase compiled code size allot (3 to 5 kB)

Why would C++ be more memory intensive than C? It works exactly like C when compiled so the difference would be close to none.

Also, why would memory allocation be a bigger problem in C++ than it is in C? After all newlib uses the same procedures to allocate memory with C++ as it does in C. You can use stack allocation in C++ too despite it being rather limiting.

Simon