JLink was enable to detect and remove AP protection of the nRF52832

I was trying to program the nRF52_Sensor_R40 using OpenOCD + STLink, but without luck.

Then I decided to use my JLink EDU to erase the nRF52 and it worked! \o/

I powered the nRF52_Sensor_R40 with 3.3V connected the GND to JLink’s pin 20, the 3.3V to JLink’s pin 1, the SWDCLK to JLink’s pin 9 and SWDIO to JLink’s pin 7.

$ sudo JLinkExe -if SWD
SEGGER J-Link Commander V6.80d (Compiled Jun 26 2020 17:19:52)
DLL version V6.80d, compiled Jun 26 2020 17:19:40

Connecting to J-Link via USB...O.K.
Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46
Hardware version: V8.00

Please specify device / core. : NRF52832_XXAA
Type '?' for selection dialog
Specify target interface speed [kHz]. : 4000 kHz
Device "NRF52832_XXAA" selected.

Connecting to target via SWD
InitTarget() start
Device will be unsecured now.
InitTarget() end
Found SW-DP with ID 0x2BA01477
Unknown DP version. Assuming DPv0
Scanning AP map to find all available APs
AP[2]: Stopped AP scan as end of AP map has been reached
AP[0]: AHB-AP (IDR: 0x24770011)
AP[1]: JTAG-AP (IDR: 0x02880000)
Iterating through AP map to find AHB-AP to use
AP[0]: Core found
AP[0]: AHB-AP ROM base: 0xE00FF000
CPUID register: 0x410FXXXX. Implementer code: 0x41 (ARM)
Found Cortex-M4 r0p1, Little endian.
FPUnit: 6 code (BP) slots and 2 literal slots
CoreSight components:
ROMTbl[0] @ E00FF000
ROMTbl[0][0]: E000E000, CID: B105E00D, PID: 000BB00C SCS-M7
ROMTbl[0][1]: E0001000, CID: B105E00D, PID: 003BB002 DWT
ROMTbl[0][2]: E0002000, CID: B105E00D, PID: 002BB003 FPB
ROMTbl[0][3]: E0000000, CID: B105E00D, PID: 003BB001 ITM
ROMTbl[0][4]: E0040000, CID: B105900D, PID: 000BB9A1 TPIU
ROMTbl[0][5]: E0041000, CID: B105900D, PID: 000BB925 ETM
Cortex-M4 identified.

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