nRF52810 ic not recognized by segger J link

[redanb]

SWDIO,SWDCLK,VCC AND GND have been taken out from the nrf52810 ic and proper connections have been made to the jtag end of the j link device (connecting all grounds also) but the target is not recognized by the j link commander.Please guide how to program the nrf52810 ic using J link.

[Øyvind]

Hello, 

Can you please provide a full schematic as awneil mentions. Similar to the reference layout below:

Please see our other reference layout for nRF52810 here.

Kind regards,
Øyvind

[redanb]

We have not followed the reference layout given above ; we just took out swdio ,swdclk,vcc and gnd from the ic on the pcb so that we can use swdio and swdclk for programming by making the connections as shown above to the 20 pin jtag j link.Will it work ?

[Øyvind]

I'm sorry, but you will need to provide the schematics of your board. 

Are you sure that your board is powered? Have you measured on the device? How have you connected the three (your board, JLink, and different board) together?

redanb said:

Do you think it is a supply problem or ic layout problem?

 Very difficult to say at this moment. I need to know what is on your board.

Kind regards,
Øyvind

[redanb]

Yes the board is powered , all three are connected.Here are the layouts of the 2 ics we tried upon:

[Øyvind]

Just to be clear: The BL652 has an nRF52832 and the BMD300 has an nRF52832. Are you certain you that you are trying to flash the correct device?

[redanb]

We also tried on laird bl651 having nrf52810 but atleast any of the devices we tried should have been recognized by the j link.When i open the j link commander it shows vref =0v although i have connected vcc of the target to the vref of the 20 pin jtag connector of j link and i also checked using multimeter the voltage between vref and gnd it was 3.2-3.3 volts

[Øyvind]

redanb said:

When i open the j link commander it shows vref =0v

 This indicates that the device you want to flash is not powered. Have you ensured that you have connected correctly? Remember, the JLink 20 Pin connector does not power your device, it only sets the correct voltage reference internally. Can you please provide a line drawing of how the green and the red board is connected to each other and the JLink? Please indicate on the image what the green board is and what the red board is? Is the green board a custom board made by you?

[redanb]

I can assure you target is powered as I directly measured at the pins of the target mcirocontroller.Green board is the custom target nrf board  and red board is a sparkfun nrf52840 pro mini giving vcc and gnd to the target and all the grounds are common.

Moreover, I also took out swdio and swdclk pins from the sparkfun board and connected it to the jlink but still vref was 0 v in j link commander and I made proper connections.

https://cdn.sparkfun.com/r/600-600/assets/learn_tutorials/8/2/0/hardware-swd-pins-soldered.jpg

[Øyvind]

I'm sorry, but without knowing your connections I am not able to help you. The issue sounds to be a missing connection between the JLink and the board you want to flash. Please verify that all wires are working and that they are connected correctly.

[redanb]

Sorry for replying late .Here is the image of the connections made

:

Also if you can guide what is the required wiring it will be really helpful as I will stricty follow your guidelines and it will be easier to troubleshoot and figure out the exact problem.