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EmbeddedRPC / erpc

Embedded RPC
https://github.com/EmbeddedRPC/erpc/wiki
BSD 3-Clause "New" or "Revised" License
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eRPC using in classic autosar #273

Closed Davy4fg closed 2 years ago

Davy4fg commented 2 years ago

Hi eRPC developers,

I have played eRPC a little bit in Windows on PC and linux on arm A core. Thanks for the nice design and development.

Now I am going to evaluate eRPC on M core. Is there a possibility to run eRPC on M core with classic autosar which use C programming?

If yes, any suggestions on porting?

Thanks

Hadatko commented 2 years ago

Hi @Davy4fg , i am not sure what classic autosar means. This application can be run with usage C language but you need also c++ compiler.

Davy4fg commented 2 years ago

Hi Hadatko,

Thanks for the feedback.

Classis autosar is an automotive OS used in M core. It only support static allocation RAM. Project is written in C language. Our compiler is greenhills ccarm for C and cxarm for c++. I compile the eRPC cpp file by c++ compiler and create obj files. During linking by C compiler with other C objects, it will prompt unresolved error for "new" keyword in C++ which are used in the C-wrapper functions.

Do you have any suggestions?

Hadatko commented 2 years ago

It would be helpful if you share error you got.

Davy4fg commented 2 years ago

To make things easier. I tried a simple c++ file with a class, a c++ file for c-wrapper, and a main.c. The linker result is similar.

The error is as follows, LD TestSuit.elf [elxr] (error #412) unresolved symbols: 2 nwFUi from cpp_wrapper.o dlFPv from cpp_wrapper.o

[elxr] (error) errors during processing make: *** [....\MakeSupport/Global.Makefile.target.4.mk:837: TestSuit.elf] Error 1

Maybe overload C++ new and delete methods is needed? let me make a try

Hadatko commented 2 years ago

If overload is needed you can take a look here: https://github.com/EmbeddedRPC/erpc/blob/develop/erpc_c/port/erpc_port_stdlib.cpp

Davy4fg commented 2 years ago

Thanks, Hadatko.

There's no malloc function available in classic autosar. And I overload the new funtion to locate memory in stack, build and link is ok. But mcu stuck in loading time. I don't have debugger currently, so I can't figure out the reason.

Anyway, it is not proper to use C++ program in classic autosar. We have not develop any project in C++ with M core in automotive industry. So is it possible to provide a pure C eRPC version some time in the future?

Hadatko commented 2 years ago

I don't think so. It would mean rewrite whole eRPC framework. For static memory allocation we are using ManualConstructor. But shim code may generate code which is using dynamic allocation.

Davy4fg commented 2 years ago

Build works after changing to static memory location and dropping C++ keyword. Close.