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No Trace Clk

feba
Prodigy 120 points
Other Parts Discussed in Thread: TM4C123GE6PM

Hello,
I try to use the (ETM) Trace functionality of a TM4C123xx device with IAR EW and a JTrace debug probe.
Unfortunately the download and debug of the bins works with JTAG/SWD also the SWO tracing works fine- but if I activate the ETM option- I receive the message that no tace clk could be detected. So there is no trace clk from the TM4C- do I have to initialize the ETM module?

Thanks for help!!
Felix.

  • 0
    TI__Guru**** 244380 points

    Hello Felix,

    The ETM Trace clock is not available on the TM4C123 but only on the TM4C129 devices.

    Regards

    Amit

  • 0 in reply to Amit Ashara
    Prodigy 120 points

    Hello Amit,

    I’m very confused about your post.
    In all the datasheets I saw (e.g. http://www.ti.com/lit/gpn/tm4c123ge6pm) the ETM trace port is documented- for the TM4C123 devices...
    Also in the hardware design guide the trace port is documented- including the trace clk pin….

    Felix.

  • 0 in reply to feba
    TI__Guru**** 244380 points

    Hello Felix,

    What it did not mention is if the GPIO Port F has been configured for Trace Function. The pins are PF0 to PF4 (please note that PF0 is a locked pin, so you would need to unlock it first)

    Regards

    Amit

  • 0 in reply to Amit Ashara
    Prodigy 120 points

    Hello Amit,

    we connect the Trace port to GPIO Port F0 to 4.
    Is the trace functionality for this pins the default setting after a reset or is a initialisation needed?
    I tried:
        // enable trace port
        SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
        GPIOPinConfigure(GPIO_PF3_TRCLK);
        GPIOPinConfigure(GPIO_PF2_TRD0);
        GPIOPinConfigure(GPIO_PF1_TRD1);
        GPIOPinConfigure(GPIO_PF0_TRD2);
        GPIOPinConfigure(GPIO_PF4_TRD3);

    with no succes-no trace clk at the controller pin.
    What I have to do to enable the trace buffer function?

    Thanks!
    Regards
    Felix

  • 0 in reply to feba
    TI__Guru**** 244380 points

    Hello Felix,

    The Trace Pins are not configured by default. Only the JTAG and Boot Loader pins are enabled by default at power on reset. I checked the data sheet and it seems that the trace is available only in the serial wire mode.

    Regards

    Amit