Posted on: 2009-04-27 09:10
Hi, I am using the Yagarto toolchain for the AT91SAM9RL64. I am required to design a GUI on this chip and a GRaphical LCD. The X11R6 libraries are being used to handle the graphic realted parts. My querry was, 1. could i use CPP (C++) to develop my GUI (using the same setup as mentioned above). 2. are there any precautions / care that i should be taking while taking a plunge at CPP please reply urgent
Posted on: 2009-04-27 19:45
Well if there is a C++ compiler for your target platform, why not? Usually GUI development is done with some sort of library/toolkit (on Standard-PCs: GTK+, Qt, MFC, ...). No idea if there is something like that available for the hardware you are using.
Posted on: 2009-04-28 00:35
Michael Rodrigues wrote: > The X11R6 libraries are > being used to handle the graphic realted parts. > Will X run without an underlying Unix/Linux support? Seems a bit heavyweight for such a limited part. Do you have external memory resources? > My querry was, > 1. could i use CPP (C++) to develop my GUI (using the same setup as > mentioned above). > You can use C++, and mix C++ and C libraries. > 2. are there any precautions / care that i should be taking while taking > a plunge at CPP C++ has additional runtime set-up requirements. Your crt0.s must include code to invoke the constructors of statically allocated objects. I have seen crt0.s implementations that do not include such code so static objects will not be correctly initialised when main() is started. The newlib sbrk stub must be implemented to allow the 'new' operator to work since it is implemented using malloc(). You may want to avoid dynamic memory allocation due to lack of determinism or resource, and to avoid memory fragmentation. Much of the standard library makes extensive use of dynamic memory, so you may wish to avoid that too. The STL and sting libraries add significantly to code size. Note also that some library calls throw exceptions. The 'new' operator also thors exceptions rather than returning NULL like malloc(). You can include <new.h> and use 'new(std::no_throw)' instead of plain 'new'. When mixing C and C++, be aware that C++ has different linkage conventions. C header files used for C++ linkage must have the extern "C" declaration within conditional compilation, and C++ interfaces to be used in C code must have been compiled with extern "C" declarations. See http://www.parashift.com/c++-faq-lite/mixing-c-and-cpp.html Clifford
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