Why I can not start DTM mode?

RE: Why I can not start DTM mode?

Håkon Alseth — Tue, 07 Jan 2025 08:17:04 GMT

Great to hear. Hope you have a wonderful day!

Kind regards,

Håkon

RE: Why I can not start DTM mode?

cgha — Tue, 07 Jan 2025 01:15:50 GMT

I'm using S130, Thanks, it got work now.

RE: Why I can not start DTM mode?

Håkon Alseth — Mon, 06 Jan 2025 13:19:39 GMT

Hi,

If you erase the softdevice, you should use the pca10028/blank target.

If you have the softdevice present, you should use the pca10028/s130 target for flashing.

Can you verify that you are using pca10028/blank/arm* target?

Kind regards,

Håkon

RE: Why I can not start DTM mode?

cgha — Mon, 06 Jan 2025 11:38:23 GMT

I use external 32.768K crystal, Do I need to program the softdevice? The wiki saied I need to erase the softdevice, So I fully erased the chip before program dtm. I found I can not debug the application use jlink in keil mdk, it can not run into main.

RE: Why I can not start DTM mode?

Håkon Alseth — Mon, 06 Jan 2025 11:22:13 GMT

Hi,

One difference between the uart sample, and the DTM is the requirement for the external HFXO to run.

Have you tried to flash your direct_test_mode example and entered debug mode to see if it is stuck in this loop?

NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
NRF_CLOCK->TASKS_HFCLKSTART    = 1;

while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0)
{
    // Do nothing while waiting for the clock to start
}

If it is stuck in this loop, it indicates that there is a problem with your external HFCLK circuitry, likely the xtal caps are incorrect.

Kind regards,

Håkon