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

[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

[Kushagra12]

yes it is a pre made module

[Håkon Alseth]

Hi,

 

Thanks for clarifying.

Those should if you power it, and connect a debugger to the SWD pins.

 

Can you attach the log file generated after executing "nrfjprog --recover -f nrf53 --log"?

Kind regards,

Håkon