SYS/BIOS clock function linking problem

You also need to be sure that you have the following in all .c files that use Semaphore module.

#include <ti/sysbios/knl/Semaphore.h>

Can you send full linker error?

-Karl-

David and Karl,

I have both the #include in the c code and the xdc.useModule line in the .cfg file.  Here is the full linker error:

 undefined       first referenced                                              
  symbol             in file                                                   
 ---------       ----------------                                              
 _Semaphore_post Z:/trunk/df/taskProj/Debug/configPkg/package/cfg/mutex.p64P.obj

error: unresolved symbols remain
error: errors encountered during linking; "taskProj.out" not built

>> Compilation failure
gmake: *** [taskProj.out] Error 1
gmake: Target `all' not remade because of errors.

So pretty much exactly as I said and nothing else.  I can call Semaphore_post from the c code just fine, I just cannot use Semaphore_post as the clkFxn argument to Clock.create in the .cfg file.  Further, if I set up the clock using the C api rather than in the cfg file (functional c code below), it works just fine.

    Clock_Params clkParams;
    Clock_Params_init(&clkParams);
    clkParams.period = 1000;
    clkParams.startFlag = TRUE;
    clkParams.arg = (UArg)testSem;
    Clock_create(Semaphore_post, 1000, &clkParams, NULL);

Edit by way of post:  disregard the difference in variable names between this and my first post; it is not real.

double edit: I just noticed the edit button...

Brady,
I think your problem arose because the symbol 'Semaphore_post' does not exist.   Semaphore_XXX APIs used in your application are actually mapped to symbols that reflect the fully qualified RTSC path to the module (see ti/sysbios/knl/Semaphore.h).  I.e. the correct symbol for Semaphore_post is actually something like ti_sysbios_knl_Semaphore_post__F.

You can get around this by using the XDC identifier for this function instead of using the symbol name.  Try

Program.global.myClock = Clock.create(Semaphore.post, 1000, clockParams);

instead of

Program.global.myClock = Clock.create("&Semaphore_post", 1000, clockParams);

Regards,
Shreyas

Shreyas,

Unfortunately, that does not work either.  I get an XDC runtime error:

XDC runtime error: ti.sysbios.knl.Semaphore: no property named 'post'

-Brady

I have to look into why this isn't working.  In the mean time you can use the following:

Program.global.myClock = Clock.create("&ti_sysbios_knl_Semaphore_post__E", 1000, clockParams);

Shreyas,

Thanks for all the help with this.  Unfortunately, that also does not work, and fails with this error:

"package/cfg/mutex_p64P.c", line 2245: error: declaration is incompatible with "void ti_sysbios_knl_Semaphore_post__E(ti_sysbios_knl_Semaphore_Handle)" (declared at line 347 of "C:/PROGRA~1/TEXASI~1/bios_6_31_02_23/packages/ti/sysbios/knl/Semaphore.h")
1 error detected in the compilation of "package/cfg/mutex_p64P.c".

The problem here is that the generated mutex_p64P.c file declares the Semaphore_post function as taking an xdc_UArg argument type, while the declaration in Semaphore.h says it takes one of type ti_sysbios_knl_Semaphore_Handle.

-Brady

Sasha,

Thanks, this was helpful.  It compiled, but it was still not actually posting the semaphore.  I changed the clock function arg from this:

clockParams.arg ="&mySem";

to this:

clockParams.arg = Program.global.mySem;

and now it works as expected.  Again, thanks to everyone for the help.

-Brady