Programming error JLinkARM.dll CORESIGHT_WriteAPDPReg

[Roger Clark]

Can someone tell me what these errors actually mean

JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -1. JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -102.

When programming a custom nRF52832 board using JLink.

I seem to intermittently get them, and no matter how many times I run nrfjprog --reset --f nRF52 it keeps giving the error

Strangely if I open in JFlash and try repeatedly to connect, after about 5 attempts the problem seems to resolve its self.

I'm wondering if this is a power supply problem ?

But knowing what the message means would be useful

Thanks

[Roger Clark]

nrfjprog.exe --reset -f nrf52 --log

nrfjprog verion 9.6.0
--------------------------------------------------------------------------------
FUNCTION: open_dll.
FUNCTION: open_dll.
FUNCTION: enum_emu_snr.
FUNCTION: enum_emu_snr.
FUNCTION: enum_emu_snr.
FUNCTION: enum_emu_snr.
FUNCTION: connect_to_emu_with_snr.
FUNCTION: connect_to_emu_with_snr.
FUNCTION: connect_to_emu_without_snr.
FUNCTION: enum_emu_snr.
Device "NRF52832_XXAA" selected.
FUNCTION: read_device_version.
FUNCTION: read_device_version.
JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -1.
JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -102.
FUNCTION: close_dll.
FUNCTION: close_dll.

JLink version is the one installed by nrftools, 6.16a

But I tried older versions of the jlink DLL and had the same problem.

What is the APDRP register ??