[SOLVED] Ozone: Debug at power-on conditions

icwiener · Jul 3rd 2020, 5:34pm

Hi,

we have a problem where we need to debug the conditions at very close time to the power-on state.
If we switch on the device and then connect with Ozone manually, it is already too late.

Is there a way to have Ozone start the debugging session automatically when the J-Link Pro detects a connected device?

Or can the J-Link Pro maybe cache some data before Ozone connects to it?

Maybe a stupid question but after two days of fiddling with this and on a Friday evening, my brain is fried.

Cheers

SEGGER - Nino · Jul 7th 2020, 4:51pm

Hi,

The Arm debug interface is unfortunately not designed to catch such power on issues directly.
So proper debugging as you know it with J-Link usually will not work. The only viable way is to write debug messages or variable values to some buffer on target side that gets written after startup. Then you can attach with J-Link at a later point and read out the data buffer.

For a minimal footprint and maximal performance of such implementation we recommend RTT:
segger.com/products/debug-prob…about-real-time-transfer/

Best regards,
Nino

icwiener · Jul 8th 2020, 9:04am

Hi Nino,

thank you for clarification. I thought so ... but hope dies last.

I will look into the RTT link, thanks.

Cheers

icwiener · Jul 8th 2020, 4:17pm

Hi,

I included RTT into my target firmware and it works like a charm with RTT Viewer.

Thanks a lot!

Cheers

SEGGER - Nino · Jul 10th 2020, 2:13pm

Hi,

Great to hear that you are up and running.

We will consider this thread as closed now.

Best regards,
Nino

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