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RTOS/TMS320C6678: EDMA3 Initialization crashes

David Hague
Intellectual 560 points
Part Number: TMS320C6678


Tool/software: TI-RTOS

I’m working on a C6678 DSP multi-core embedded project and I'm trying to get our DMA Library working.   It uses the TI EDMA3 library (edma3_lld_02_12_01_22).  Our code is crashing during initialization.   We call EDMA3_DRV_create() without any problems but when we call EDMA3_DRV_open() we crash.  I’ve been able to step into the code and it is crashing in edma3resmgr.c, in the EDMA3_RM_allocResource() routine, on line 1138 when it calls:

 

                            /**

                              * Take the instance specific semaphore, to prevent simultaneous

                              * access to the shared resources.

                              */

                            semResult = edma3OsSemTake(rmInstance->initParam.rmSemHandle,

                                                    EDMA3_OSSEM_NO_TIMEOUT);

 

The rmSemHandle was created by our code earlier like this:

 

   /*

   **  Create DMA DRV semaphores

   */

   Error_init (&eb);

 

   Semaphore_Params_init (&semParams);

 

   semParams.mode = Semaphore_Mode_COUNTING;

 

   dma_drv_sema4 = Semaphore_create (1, &semParams, &eb);

 

This semaphore passed into the structure.  I verified that the address is getting passed down correctly so I don’t know why the call to edma3OsSemTake would crash.  I have some source for that routine but the debugger won’t let me step through it, only the disassembly.  It seems to crash on the second assembly instruction.

 

In all of the TI examples, initialization is done by calling edma3init(), which is in the “sample library”, called edma3_lld_drv_sample.ae66.  But if I try to include this library into our project, I get lots of duplicate symbols defined conflicting with platform_lib (ti.platform.evm6678l.ae66) which I must include for other things.

 

I've seen the source for ema3init() and it calls edma3OsSemCreate() to create the semaphore.  I've also seen source for edma3OsSemCreate() and all it does is call Semaphore_create().  But maybe this is not the actual source?  My only guess is that edma3OsSemCreate does something other than just call Semaphore_create() which I am not doing and edma3OsSemTake() is expecting.

 

Not sure how to resolve this.

  • 0
    TI__Guru 65405 points
    I've forwarded this to the SW team. Their feedback should be posted here.

    BR
    Tsvetolin Shulev
  • 0 in reply to Cvetolin Shulev-XID
    Intellectual 560 points

    I've sort figured out the problem:

     

    In our RTSC configuration we included Framework Components 3.40.1.04

     

    In our app.cfg file, we had the following line:

     

    var EdmaMgr = xdc.useModule('ti.sdo.fc.edmamgr.EdmaMgr');

     

    It turns out, that library contains:

     

       Edma3OsProtectEntry()

       Edma3ProtectExit()

       Edma3OsSemGive()

       Edma3OsSemTake()

     

    BUT, the Edma3OsSemCreate (along with the 4 routines above) is in:

     

    C:\ti\edma3_lld_02_12_01_22\ packages\ti\sdo\edma3\drv\sample\lib\c6678-evm\66\debug\ edma3_lld_drv_sample.ae66

     

    So, if I remove the Framework Components from RTSC, and the EdmaMgr line from app.cfg and add the edma3_lld_drv_sample.ae66 library, it builds and runs.

     

    I guess the only question remaining is, should we really be including a library with “sample” in the name?

     

  • 0 in reply to David Hague
    Intellectual 560 points
    I need to know which libraries I should be linking into my project for EDMA3.
  • 0 in reply to David Hague
    TI__Guru* 95265 points
    Hi,

    You need the following libraries:

    edma3_lld_drv_sample.ae66
    edma3_lld_drv.ae66
    edma3_lld_rm.ae66

    Regards, Eric