Outputting 32MHZ clock on TRACECLK pin

RE: Outputting 32MHZ clock on TRACECLK pin

Håkon Alseth — Mon, 14 Jan 2019 15:11:35 GMT

I think there's some misunderstanding here. The TRACECLK is only enabled when a TRACE enabled debugger is connected, and your device is properly configured by the debugger to output this signal.

Do you want to use TRACE when debugging your project, or do you want to generate a pulse train on a specific GPIO?

If you want to generate a clock pulse on a given GPIO, you can use GPIOTE+PPI+TIMER to obtain this, like this example for the nRF51-series devices:

https://github.com/NordicPlayground/nrf51-8-mhz-gpio-clock/blob/master/main.c

Kind regards,

Håkon

RE: Outputting 32MHZ clock on TRACECLK pin

Patrick — Mon, 14 Jan 2019 14:56:24 GMT

These app notes show using the TRACECLK pin in debugging mode.

What we would like to do is on a GPIO (In this case P0_20) output a divided down version of the

32MHZ input clock. Ideally 16MHZ but can be slower if the part does NOT support that speed on a GPIO.

How can we setup a GPIO to this?

Thanks. Pat

RE: Outputting 32MHZ clock on TRACECLK pin

Patrick — Mon, 14 Jan 2019 14:44:52 GMT

Thanks. I will provide this to the SW team and let you know the results.

RE: Outputting 32MHZ clock on TRACECLK pin

Håkon Alseth — Mon, 14 Jan 2019 14:37:40 GMT

Hi,

There's a post on this in the blog section:

https://devzone.nordicsemi.com/b/blog/posts/debugging-nrf52-series-devices-using-trace

And one from Keil as well:

https://devzone.nordicsemi.com/b/blog/posts/nrf52-tutorial-etm-instruction-trace-with-keil-mdk

If you are still getting errors, could you post the output from your IDE?

Kind regards,

Håkon