Unable to recover NRF52832 with JLink after reset event

[Expy]

Hello ! My custom board is working fine (with the last programm I flashed into), but I can't access it with my debugger and I can't flash it again.
When I try to flash it or recover I got this error :

C:\Dev\Dunakev\all_about_dCar\ProgrammeHexCompil>nrfjprog -f NRF52 --recover --log
Recovering device. This operation might take 30s.
ERROR: Recover failed. Please make sure that the correct device family is given
ERROR: and try again.

The log from this issue :

--------------------------------------------------------------------------------
nrfjprog -f NRF52 --recover --log
nrfjprog version 9.7.3
--------------------------------------------------------------------------------
nRF_open_dll
. nRF52_open_dll
. . nRF52_dll_version
nRF_enum_emu_snr
. nRF52_enum_emu_snr
. . nRF52_enum_emu_snr
nRF_enum_emu_snr
. nRF52_enum_emu_snr
. . nRF52_enum_emu_snr
nRF_connect_to_emu_with_snr
. nRF52_connect_to_emu_with_snr
. . nRF52_is_connected_to_emu
. . nRF52_enum_emu_snr
. . nRF52_connect_to_emu_with_snr
. . . nRF52_connect_to_emu_without_snr
. . . nRF52_connect_to_emu_without_snr: JLink: Firmware: J-Link V10 compiled Sep 4 2018 11:24:21
. . . nRF52_connect_to_emu_without_snr: JLink: Hardware: V10.10
. . . nRF52_connect_to_emu_without_snr: JLink: S/N: 260100542
. . . nRF52_connect_to_emu_without_snr: JLink: OEM: SEGGER-EDU
. . . nRF52_connect_to_emu_without_snr: JLink: Feature(s): FlashBP, GDB
. . . nRF52_connect_to_emu_without_snr: JLink: TELNET listener socket opened on port 19021
. . . nRF52_connect_to_emu_without_snr: JLink: WEBSRV Starting webserver
. . . nRF52_connect_to_emu_without_snr: JLink: (0024ms, 0041ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: WEBSRV Webserver running on local port 19081
. . . nRF52_connect_to_emu_without_snr: JLink: (0026ms, 0043ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: returns O.K.
. . . nRF52_connect_to_emu_without_snr: JLink: (0029ms, 0046ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: JLINK_GetHWStatus(...)
. . . nRF52_connect_to_emu_without_snr: JLink: returns 0x00
. . . nRF52_connect_to_emu_without_snr: JLink: (0001ms, 0047ms total) 
. . . nRF52_connect_to_emu_without_snr: There is no generic nRF52 device in J-Link, so we select NRF52832_xxAA.

. . . nRF52_connect_to_emu_without_snr: JLink: JLINK_ExecCommand("Device = NRF52832_xxAA", ...). 
. . . nRF52_connect_to_emu_without_snr: JLink: XML file found at: C:\Program Files (x86)\SEGGER\JLink_V634f\JLinkDevices.xml
. . . nRF52_connect_to_emu_without_snr: JLink: (0003ms, 0052ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: C:\Program Files (x86)\SEGGER\JLink_V634f\JLinkDevices.xml evaluated successfully.
. . . nRF52_connect_to_emu_without_snr: JLink: Device "NRF52832_XXAA" selected.
. . . nRF52_connect_to_emu_without_snr: JLink: Device "NRF52832_XXAA" selected.
. . . nRF52_connect_to_emu_without_snr: JLink: returns 0x00
. . . nRF52_connect_to_emu_without_snr: JLink: (0093ms, 0142ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: JLINK_ExecCommand("SetRestartOnClose = 0", ...). 
. . . nRF52_connect_to_emu_without_snr: JLink: returns 0x01
. . . nRF52_connect_to_emu_without_snr: JLink: (0000ms, 0143ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: JLINK_ExecCommand("DisableFlashDL", ...). 
. . . nRF52_connect_to_emu_without_snr: JLink: returns 0x00
. . . nRF52_connect_to_emu_without_snr: JLink: (0001ms, 0145ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: JLINK_ExecCommand("SetDbgPowerDownOnClose = 1", ...). 
. . . nRF52_connect_to_emu_without_snr: JLink: returns 0x01
. . . nRF52_connect_to_emu_without_snr: JLink: (0000ms, 0146ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: JLINK_ExecCommand("ExcludeFlashCacheRange 0x0-0xFFFFFFFF", ...). 
. . . nRF52_connect_to_emu_without_snr: JLink: returns 0x00
. . . nRF52_connect_to_emu_without_snr: JLink: (0000ms, 0147ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: JLINK_TIF_Select(JLINKARM_TIF_SWD)
. . . nRF52_connect_to_emu_without_snr: JLink: returns 0x00
. . . nRF52_connect_to_emu_without_snr: JLink: (0002ms, 0150ms total) 
. . . nRF52_connect_to_emu_without_snr: JLink: JLINK_SetSpeed(2000)
. . . nRF52_connect_to_emu_without_snr: JLink: (0001ms, 0152ms total) 
nRF_recover
. nRF52_recover
. . nRF52_is_connected_to_emu
. . nRF52_is_connected_to_emu: JLink: JLINK_IsOpen()
. . nRF52_is_connected_to_emu: JLink: returns 0x01
. . nRF52_is_connected_to_emu: JLink: (0001ms, 0153ms total) 
. . nRF52_is_connected_to_device
. . nRF52_is_connected_to_device: JLink: JLINK_IsConnected()
. . nRF52_is_connected_to_device: JLink: returns FALSE
. . nRF52_is_connected_to_device: JLink: (0001ms, 0155ms total) 
. . nRF52_readback_status
. . . nRF52_is_ctrl_ap_available
. . . . nRF52_read_access_port_register
. . . . . nRF52_coresight_configure
. . . . . nRF52_coresight_configure: JLink: JLINK_CORESIGHT_Configure()
. . . . . nRF52_coresight_configure: JLink: returns 0
. . . . . nRF52_coresight_configure: JLink: (0102ms, 0257ms total) 
. . . . . nRF52_power_debug_and_system_regions
. . . . . . nRF52_write_debug_port_register
. . . . . . nRF52_write_debug_port_register: JLink: JLINK_CORESIGHT_WriteAPDPReg(DP reg 0x02, 0x00000000)
. . . . . . nRF52_write_debug_port_register: JLink: returns -1
. . . . . . nRF52_write_debug_port_register: JLink: (0001ms, 0258ms total) 
. . . . . . nRF52_write_debug_port_register: JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -1.

. . . . . nRF52_power_debug_and_system_regions: JLinkARM.dll CORESIGHT_WriteAPDPReg returned error -102.

nRF_close_dll
. nRF52_close_dll
. . nRF52_is_connected_to_emu
. . nRF52_is_connected_to_emu: JLink: JLINK_IsOpen()
. . nRF52_is_connected_to_emu: JLink: returns 0x01
. . nRF52_is_connected_to_emu: JLink: (0001ms, 0260ms total) 
. . nRF52_disconnect_from_emu
. . . nRF52_is_connected_to_device
. . . nRF52_is_connected_to_device: JLink: JLINK_IsConnected()
. . . nRF52_is_connected_to_device: JLink: returns FALSE
. . . nRF52_is_connected_to_device: JLink: (0001ms, 0261ms total) 
. . . nRF52_unpower_debug_and_system_regions
. . nRF52_disconnect_from_emu: JLink: JLINK_Close()

And when I try to connect directly through JLink :

C:\Program Files (x86)\SEGGER\JLink_V634f>JLink -if swd -device nrf52
SEGGER J-Link Commander V6.34f (Compiled Sep 5 2018 13:25:56)
DLL version V6.34f, compiled Sep 5 2018 13:25:28

Connecting to J-Link via USB...O.K.
Firmware: J-Link V10 compiled Sep 4 2018 11:24:21
Hardware version: V10.10
S/N: 260100542
License(s): FlashBP, GDB
OEM: SEGGER-EDU
VTref=3.638V


Type "connect" to establish a target connection, '?' for help
J-Link>connect
Specify target interface speed [kHz]. <Default>: 4000 kHz
Speed>
Device "NRF52" selected.


Connecting to target via SWD
Cannot connect to target.

My pin P0.21(Reset) is high.
I went through your forum looking for a solution but despite all that could be found it gave no result.

Can anyone help? Thanks a lot

[Turbo J]

Did you reconfigure SWD or Reset pins?

Recovering requires at least SWD. There is a small timing window during power-up (or device reset) where recovery is possible.

You may need to play with target power (or reset if available) manually just before launching above nrfjprog command line.

[Expy]

First, thank you for your support.
What do you mean by "reconfigure SWD" ? I didn't know that it was configurable.

I know that I need SWD, but it seems that the NRF52 not allow to use it. The connection between debugger and SWDIO/SWDCLK is good, but still, my JLink can't access.
I've already tried to force the reset pin but without success.

[Turbo J]

RTFM: SWD and Reset can be disabled in the UICR.

Did you remember to connect the target voltage properly to your Segger EDU?

The 3.6 Volts seems rather high -  please don't connect an NRF5x directly to a Li-Ion or Li-Poly cell. These charge up to 4.2 Volts, which is above absolute maximum rating.

[Expy]

Thanks, but i've already read it, and I know we can disabled Reset, but I've not found any information about a reconfiguration for SWD.

The Reset haven't been reconfigured. And yes the debugger connector was connected properly.

The 3.6V come from a regulator, and we use it because we have another component which required this voltage.

[Sigurd]

Hi,

Have you connected VTG detect and GND detect?

What is the voltage on the reset pin(P0.21)?

Could you double check you wiring, and make sure that you have not e.g switched SWD IO AND SWD CLK.

Could you upload a picture of your setup that shows how the wires are connected?