Hi,
I have developed a piece of software that only uses the GPIOs on the APP core to evaluate a sensor. The software worked on the development board processor so I made a custom board with the nRF5340. After I would load the same software that worked on the dev board onto the external board the debugging would start and immediately jump to the following code in fault_s.S
#if defined(CONFIG_ARMV6_M_ARMV8_M_BASELINE) || \
defined(CONFIG_ARMV7_M_ARMV8_M_MAINLINE)
mrs r0, MSP
mrs r1, PSP
mov r2, lr /* EXC_RETURN */
push {r0, lr}
it would run to push {r0,lr} after which I would loose connection to the board and every attempt to talk to the board after what would result in error message
Firmware Version: J-Link OB-K22-NordicSemi compiled Jan 21 2020 17:33:01
DLL Version: 6.60f
Hardware Version: V1.00
Target Voltage: 3.300
Device "NRF5340_XXAA_APP" selected.
ConfigTargetSettings() start
ConfigTargetSettings() end
ConfigTargetSettings() start
ConfigTargetSettings() end
connect failed
Failed to connect to target.
No idcode detected.
Please check connection and Target Interface Type
I have tried running the --eraseall and --recovery with nrfjprog but that failed as well. Here is the dump form the log
-------------------------------------------------------------------------------
nrfjprog -f UNKNOWN --recover --log
nrfjprog verion 9.7.1
--------------------------------------------------------------------------------
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_connected_emu_snr.
FUNCTION: read_connected_emu_snr.
FUNCTION: read_device_family.
FUNCTION: read_device_family.
JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -1.
JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -102.
FUNCTION: close_dll.
FUNCTION: close_dll.
I have a 32k XTAL on the target board if that makes any difference in this situation
Any input would be appreciated
Dusan
