rtems with matlab autocode problems

[Andrei Chichak]

Just an observation:

The pattern that is being printed has the hex values AA 99 55 66. First, it's pretty odd that all of the nybbles are the same in each byte. Next, the first and third bytes are complements of each other as are the second and fourth.

This looks like a test pattern.

Andrei


On 2010-June-16, at 11:48 AM, João Rasta wrote:

> Yes, here goes
> 
> // dummy printf test code
> int upa(void)
> {
>     int i = 0;
> 
>     for (i=0; i < 20; i++)
>         printf("B\n");
> 
>     exit(0);
> 
> }
> 
> And the result is:
> 
> 
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
>     ¬ÖUf
> 
> Program exited normally. This same code works correctly if i put the function in the main code instead of the library code. I still have no idea of what can be causing this, any hints would be apreciated. Mabe a compiler flag is messing up the library code? 
> 
> The matlab autocode makefile generates some flags i don't recognize such as the DXXX:
> 
> sparc-rtems-gcc -c -O3 -g3 -ffloat-store -fPIC   -DUSE_RTMODEL -DMODEL=gnc -DRT -DNUMST=1 -DTID01EQ=0 -DNCSTATES=0 -DUNIX -DMT=0 -DHAVESTDI
> O   -I. -I../../rtwlt/matlab/simulink/include -I../../rtwlt/matlab/extern/include -I../../rtwlt/matlab/rtw/c/src -I../../rtwlt/matlab/rtw/c/
> src/ext_mode/common -I. -I.. -I../../rtwlt/matlab/rtw/c/libsrc   ../../rtwlt/matlab/rtw/c/src/rt_sim.c
> 
> 
> These flags are not used in the "main" code, for instance
> 
> sparc-rtems-gcc  -DLOGGING=1 -DLOGNOTORIETY=10 -I"../src" -I"../src/comms/packet_lib" -I"../src/shell" -I"../src/comms" -I"../model/gnc_linu
> x" -I../rtwlt/matlab/simulink/include -I../rtwlt/matlab/extern/include -I../rtwlt/matlab/rtw/c/src -I../rtwlt/matlab/rtw/c/src/ext_mode/comm
> on -I../rtwlt/matlab/rtw/c/libsrc   -O2 -g -Wall -c -fmessage-length=0 -DRT -MMD -MP -MF"src/common.d" -MT"src/common.d" -o"src/common.o" ".
> ./src/common.c"
> 
> Has anyone seen the DXX flags?
> 
> Best,
> JM
> 
> 
> On Wed, Jun 16, 2010 at 6:31 PM, Till Straumann <strauman at slac.stanford.edu> wrote:
> Can you post the offending code?
> 
> T.
> 
> 
> On 06/16/2010 12:02 PM, João Rasta wrote:
>> Just an update:
>> 
>> If i do fflush(stdout) inside the test function, the application crashes. Also, no matter what i put in printf, it allways prints the same characters, but it detects the \n correctly.. I don't see if this can be related to the compiler..
>> 
>> 
>> Best,
>> JM
>> 
>> On Wed, Jun 16, 2010 at 4:56 PM, Joel Sherrill <joel.sherrill at oarcorp.com> wrote:
>> On 06/16/2010 10:52 AM, João Rasta wrote:
>> Hi,
>> 
>> No, autocode requires the real-time workbench only, it is quite straightforward to generate the code.
>> 
>> I didn't fully understood your question. Anyway, i have tried to compile the application with gcc and runs fine on linux so it should run on rtems with the apropriate modifications. However, when i printf("test\n") within the library finction, it returns strange characters, which doesn't happen in the function that calls the library function..
>> Is it including stdio.h?  I have seen some targets where if you don't the variable
>> arguments stuff gets confused.
>> 
>> Is the generated code warning free?
>> 
>> 
>> I suspect of a compilation flag/option i may be missing on the library. Do you have any idea?
>> 
>> As long as it is compiled the same as the rest of the app, it should be ok.
>> 
>> Also, i don't need any rtems primitives/configurations on the library functions right? I'm assuimng It is enough to have the rtems configuration on the "main" file.
>> 
>> Right.
>> 
>> Can you print from other tasks?
>> 
>> --joel
>> 
>> Best,
>> JM
>> 
>> 
>> 
>> 
>> On Wed, Jun 16, 2010 at 4:42 PM, Joel Sherrill <joel.sherrill at oarcorp.com <mailto:joel.sherrill at oarcorp.com>> wrote:
>> 
>>    On 06/16/2010 10:38 AM, João Rasta wrote:
>> 
>>        Hi,
>> 
>>        I'm having trouble running an rtems application that uses code
>>        generated from matlab using autocode. It all goes well until a
>>        function of this library is called: printfs return awkward
>>        characters and then the application crashes.
>> 
>>    I have seen references to this before.  Is this hard to do?  Are
>>    there instructions?
>>    Standard glue code, etc.
>> 
>>        1) Is there any obvious reason to why printfs of the autocode
>>        generated functions are not working properly? They are
>>        compiled with sparc-rtems-gcc, as the main code.
>> 
>>        2) Are there any special flags needed to be passed to the
>>        compiler in order to link other libraries? Or some rtems
>>        configuration..
>> 
>>    Is there any chance it is printing floating point numbers from a
>>    non-FP task?
>> 
>> 
>>        Best,
>>        JM
>> 
>> 
>> 
>>    --     Joel Sherrill, Ph.D.             Director of Research&  Development
>>    joel.sherrill at OARcorp.com        On-Line Applications Research
>>    Ask me about RTEMS: a free RTOS  Huntsville AL 35805
>>      Support Available             (256) 722-9985
>> 
>> 
>> 
>> 
>> 
>> -- 
>> Joel Sherrill, Ph.D.             Director of Research&  Development
>> joel.sherrill at OARcorp.com        On-Line Applications Research
>> Ask me about RTEMS: a free RTOS  Huntsville AL 35805
>>   Support Available             (256) 722-9985
>> 
>> 
>> 
>> 
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> 
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