Cannot able to communicate with external target

[Kushagra12]

Hi,

I am trying to flash one external module which is actually a BLE having (NRF52832) and I am using NRF52832 Development board. By doing all the necessary connections and using the DC power supply and setting the current and voltage to 11mA and 3.7V respectively. While running I am getting this error 

Connecting ‘J-Link’ using ‘USB’

Loaded /Applications/SEGGER Embedded Studio for ARM 7.22/bin/libjlinkarm.dylib

Firmware Version: J-Link OB-nRF5340-NordicSemi compiled Nov 7 2022 16:22:01

DLL Version: 7.88c

Hardware Version: V1.00

Target Voltage: 3.300

Device "NRF52832_XXAA" selected.

Current Speed: 2000 kHz

InitTarget() start

InitTarget() end - Took 102ms

Failed to attach to CPU. Trying connect under reset.

InitTarget() start

InitTarget() end - Took 106ms

Failed to connect to target.

Please help me. What steps do I need to follow now. I am getting stucked  

[Håkon Alseth]

Hi,

 

Q1: How is the connection between the nRF52-DK and your custom board?

Q2: Has your current setup worked at some point? Or newer at all?

Q3: Could you try to recover the board using nrfjprog --recover?

 

Kind regards,

Håkon

[Kushagra12]

hello Sir,

Thanks for your response.

A1: so I am following this connection, just used an external DC power source so the full connection is (image 2)

 

connections are good. I used probe station to connect the necessary pins of the custom board. From the probe station crocodile pins are connected to the respective pins of the NRF board

A2: No it never worked. This is the first time I am using this type of setup, though trying to connect it since past one month but was not able to connect.

A3: Sir, can you please tell me how to recover the board using nrfjprog --recover? I am not aware of this.

Please let me know if you need any further information.

Thanks and Regards,

Kushagra

[Håkon Alseth]

Hi,

 

The power supply should match the DK voltage, ie. 3V.

Kushagra12 said:

I used probe station to connect the necessary pins of the custom board. From the probe station crocodile pins are connected to the respective pins of the NRF board

Just to confirm, this is a custom PCB, right? Your picture mentions "bare die" - the nRF requires decoupling caps etc. to operate properly.

Kushagra12 said:

A3: Sir, can you please tell me how to recover the board using nrfjprog --recover? I am not aware of this.

You can download nrfjprog from here: https://www.nordicsemi.com/Products/Development-tools/nrf-command-line-tools/download

 

And run this in a terminal: "nrfjprog --recover"

 

Kind regards,

Håkon

[Kushagra12]

Thanks,

I will use 3V.

yes this is bare die, I thought as I am using DC power supply there is no need of using capacitors? as there is no power supply voltage function.

Thanks for the suggestion. I will add the capacitors and will check the result.

yes, nrfjprog is available in the command line tools. I will run it and will share the result.

Regards,

Kushagra 

[Håkon Alseth]

Hi,

 

You will need decoupling caps to communicate with the chip reliably over SWD. Here's the reference schematic:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/ref_circuitry.html?cp=5_2_0_52_0#schematic_qfn48_ldo

 

To run the radio, you'll also need a 32M xtal.

 

Kind regards,

Håkon

[Kushagra12]

hi sir,

I have gone through the data sheet of the bare die. Using these capacitors, It should work? please have a look

[Håkon Alseth]

Hi,

 

Your pin numbering does not match the reference layout.

As an example, DEC4 is pin 7 in your picture; but it should be pin 46.

 

Are you interfacing a pre-made module?

 

Kind regards,

Håkon