nrf51822 Minew's Module is not recognized by NRF51DK

[fercholas]

Hi guys

I am trying to program a nrf51822 module but it is not recognized by the development kit.

These are the pins that I am using:

I can not see the module with NRFGo on Windows or on linux with Jlink console.

Any idea?

Thanks in advance!

[RichieJH]

My voltmeter says I'm outputting 2.86volts to my custom PCB through the nRF 52 DK and the DK picks it up fine.

[bx]

Hi,

previous answers are correct that you need to short VCC to VTG.

Additionally you need a proper GND connection to your circuit, as GND_DETECT (pin 8 on P20) is an "input" that triggers use of external module (might be an oversimplification). I suggest you short one GND from connector P1 to your module, and short another GND to GND_DETECT.

Best regards,

Borut

[fercholas]

Hi endnode

Thanks for answering. I have tried with the connection of P20 pins 2 and 3 without results.

• P20 pin 4 for SWDIO
• P20 pin 5 for SWDCLK
• P20 pin 8 for a connection between Modules's ground and NRF51DK's ground.
• P20 2 and 3 shorted.

I am not using P20 pin 1. How do you use it?

Thanks in advance

[endnode]

Hi, hard to say what's wrong then. For me it works even when I play with second nRF5x DK board (if I bridge P20 SWD PINs to standard 10-pin SEGGER connector then I can flash nRF5x chip on the other DK without problems) so it might indicate problems with this one particular custom board. I'm using Pin 1 of P20 (VDD_nRF) to power target board by 3V. Yes, you can use other pins from other headers on nRF5x DK to achieve the same...

Cheers Jan

[fercholas]

Hi Martin

Thanks for answering. I have tried with the connection of P20 pins 2 and 3 without results.

• P20 pin 4 for SWDIO
• P20 pin 5 for SWDCLK
• P20 pin 8 for a connection between Modules's ground and NRF51DK's ground.
• P20 2 and 3 shorted.

Without the pins 2 and 3 short I have these voltages:

• 2.86V at VDD pin.
• 2.89 V at VTG pin
• 2.86 V at VnRF pin

This is the Segger Jlink output on Ubuntu:

nicolas@nicolas:~$ sudo JLinkExe -device nRF51822 -speed auto -if swd
SEGGER J-Link Commander V5.12e (Compiled Apr 29 2016 15:06:32)
DLL version V5.12e, compiled Apr 29 2016 15:06:27

Connecting to J-Link via USB...O.K.
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Mar 15 2016 18:03:17
Hardware version: V1.00
S/N: 681325908
VTref = 3.300V


Type "connect" to establish a target connection, '?' for help
J-Link> connect
Device "NRF51822_XXAA" selected.
TotalIRLen = ?, IRPrint = 0x..000000000000000000000000


Found SWD-DP with ID 0x0BB11477
Found Cortex-M0 r0p0, Little endian.
FPUnit: 4 code (BP) slots and 0 literal slots
CoreSight components:
ROMTbl 0 @ F0000000
ROMTbl 0 [0]: F00FF000, CID: B105100D, PID: 000BB471 ROM Table
ROMTbl 1 @ E00FF000
ROMTbl 1 [0]: FFF0F000, CID: B105E00D, PID: 000BB008 SCS
ROMTbl 1 [1]: FFF02000, CID: B105E00D, PID: 000BB00A DWT
ROMTbl 1 [2]: FFF03000, CID: B105E00D, PID: 000BB00B FPB
ROMTbl 0 [1]: 00002000, CID: B105900D, PID: 000BB9A3 ???
Cortex-M0 identified.

This device corresponds to nrf51DK's chip. I can't see module's chip.

Thanks in advance!