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TMS320F28377D: GPxCSEL1 changed during execution

electrocc
Expert 2440 points
Part Number: TMS320F28377D

Hello,

I use CPU1 and CPU2 in my software, and I've a question : 

Is it possible to drive a GPIO (for example GPIO0) with CPU1, and changed master which control this GPIO pin to CPU2 while program is running ?

For example, if I have a program which execute CPU1 then CPU2 : 

CPU1 :

    EALLOW;
    GpioCtrlRegs.GPACSEL1.bit.GPIO0 = 0x0; // CPU1 selected
    EDIS;
    
    GpioDataRegs.GPADAT.bit.GPIO0 = 1;
    
    DELAY_US(500);

    EALLOW;
    GpioCtrlRegs.GPACSEL1.bit.GPIO0 = 0x2; // CPU2 selected
    EDIS;

CPU2 :

  GpioDataRegs.GPADAT.bit.GPIO0 = 0;
  
  DELAY_US(500);

It doesn't seem to work.

Thanks for your feedback.

Regards,

  • 0
    TI__Guru 50430 points

    Hi,

    We should be able to change the control master from CPU1 to CPU2 at runtime. Are you using IPC to tell CPU2 that master has changed?

  • +1 in reply to Santosh Jha
    Expert 2440 points

    Hi Santosh,

    Yes, I'm using IPC but just to synchronize both CPUs.

    Unlike my example where I toggled a single bit, in reality I have to drive 1 byte (to generate a wave).

    IPC side is ok, each task is done one after the other (CPU1 then CPU2 then CPU1 ...)

    CPU1 side is working, signal is generated each time I'm executing the loop.

    CPU2 side is not working, signal is never generated (=0V).

    Any ideas ?

    CPU1 :

        EALLOW;
    GpioCtrlRegs.GPCCSEL1.all = 0x00000000; // CPU1 selected
    EDIS;
    
    GpioDataRegs.GPADAT.bit.GPIO64 = 1;
    GpioDataRegs.GPADAT.bit.GPIO65 = 0;
    ....
    GpioDataRegs.GPADAT.bit.GPIO71 = 1;
    

    EALLOW;
    GpioCtrlRegs.GPCCSEL1.all = 0x22222222; // CPU2 selected
    EDIS;
    
    IPCLtoRFlagSet(IPC_FLAG1);
    
    while (IPCLtoRFlagBusy(IPC_FLAG1));     // CPU2 hasn't clear FLAG1

    CPU2 :

        while(!IPCRtoLFlagBusy(IPC_FLAG1));         // No event was set by CPU1

    EALLOW;
    GpioDataRegs.GPADAT.bit.GPIO64 = 0;          // Toggle bit
    GpioDataRegs.GPADAT.bit.GPIO65 = 1;          // Toggle bit
    ....
    GpioDataRegs.GPADAT.bit.GPIO71 = 0;          // Toggle bit
    EDIS;
    
    IPCRtoLFlagAcknowledge(IPC_FLAG1);
    IPCLtoRFlagClear(IPC_FLAG1);

    Regards,

  • 0 in reply to electrocc
    TI__Guru 50430 points

    Hi,

    This should work. I am trying to reproduce the issue locally. I will get back to you tomorrow.

  • 0 in reply to Santosh Jha
    Expert 2440 points

    Santosh,

    I don't know what happens but the next day after my question, it worked.
    So the code is correct.

    Regards,