Producing Embedded Controller using RealTime Workshop

Hi,

I getting seriously stuck trying to understand Real Time Workshop.

For a project at university, I am trying to move our MATLAB/Simulink based control algorithms onto on-board processors, namely Gumstix Overo COM's. They run a version of command line Linux and are not suited to running the Simulink models within the Matlab Environment.

Currently we are having to manually translate our Simulink models into C++ code, but I understand it is possible to produce C++ source code directly from within Simulink using the RTW.

I have succeeded in doing this, but the generated source code won't compile using g++ or the 'make' command once the files are on the Overo COM's. The only thing I can reliably produce at the moment is a *.exe which isn't suitable for the target system.

I'm sure there is something really fundamental that I'm doing wrong, but I can't seem to find a good guide or help file to describe exactly how to do what I'm trying to do.

Host Environment: Windows x64 Laptop

Target Environment: Gumstix Overo Fire (Linux & ARM Cortex-A8 OMAP3530 Processor)

Thanks in Advance.

Answer 1

[Kaustubha Govind]

Did you make sure that you have transported all files for building on another target? See Relocating Code to Another Development Environment

[Tom]

No I hadn't. But I had got around it by copying the missing files from my computer when they came up as compiling errors. Thanks for the advice, at least I know the proper way to do that and that I was heading in the right direction.

I'm still getting errors though. I'm not sure what I should be looking at to fix this. ..

root@overo:~/Test_20110222_ert_rtw# make Test_20110222

g++ Test_20110222.cpp -o Test_20110222

/usr/lib/gcc/arm-angstrom-linux-gnueabi/4.3.3/../../../crt1.o: In function `_start':

init.c:(.text+0x30): undefined reference to `main'

/tmp/ccl2H2y9.o: In function `Test_20110222_step':

Test_20110222.cpp:(.text+0x16c): undefined reference to `rt_UpdateTXYLogVars'

Test_20110222.cpp:(.text+0x2f4): undefined reference to `Test_20110222_P'

/tmp/ccl2H2y9.o: In function `Test_20110222_terminate': Test_20110222.cpp:(.text+0x614): undefined reference to `rt_StopDataLogging'

/tmp/ccl2H2y9.o: In function `Test_20110222_initialize':

Test_20110222.cpp:(.text+0x65c): undefined reference to `rt_InitInfAndNaN'

Test_20110222.cpp:(.text+0x81c): undefined reference to `rt_StartDataLoggingWithStartTime'

collect2: ld returned 1 exit status

make: * [Test_20110222] Error 1

[Kaustubha Govind]

Did you modify the makefile for the Linux platform? The one generated for Windows probably uses LCC or MSVC. The compilation command that you use:

g++ Test_20110222.cpp -o Test_20110222

may not be sufficient for compilation. For example, there may be other object/library files to link against. Try and imitate how the build is done on Windows.

[Tom]

Hi,

Thanks for the help.

I thought that the compilation command looked a little short. I've had a look through the makefile, but I'm not sure I understand a lot of it. Can you offer any advice as to what I should be changing?

Thanks

Tom

[Kaustubha Govind]

Set Verbose Build http://www.mathworks.com/help/toolbox/rtw/ref/bq259jx-1.html#bq26cg_-1 to 'on' on Windows, to see what the exact build command used is.

[Dzung]

Hi all, I'm building and Simulink block using Simulink code generator by VC++ 2010, now I have some unresolved symbols when linking. Some body could tell me how to find these symbols in which libraries: rt_StartDataLoggingWithStartTime, rt_UpdateTXYLogVars.

[S An]

Hi, I meet the same question. Have you solved your problem? Which libraries are they in?

[ds li]

I also meet the same question, do you have the better solution?

[Mar Kim]

I too have a linking error for rt_StartDataLoggingWithStartTime, rt_UpdateTXYLogVars. Please tell us what library contains them. I actually need to compile this for ARM, so if I would prefer access to the source code.