Custom NRF51822 board Not showing in nrfgo

[Greg Winn]

Hello, I have a custom board (was built using the Nordic schematics provided with the Smart Beacon Kit). I am using J-Link LITE to try and program the board.

The board has power and I am able to connect the J-Link Lite. The J-Link Control Panel shows the target voltage and is "green".

When i launch nrfgo studio to write my bootloader it just says "No Device Detected".

Again, this is a custom board with a brand new NRF51822 chip.

Please let me know if you need any more detail! Thanks!

After adding the 100k Pulldown resistor to the SWDCLK. A 100k Pullup on SWDIO and corrected the 16Mhz crystal caps to 18pF (up from the shown 12pF).

[Stefan Birnir Sverrisson]

Hi

From your description I suspect that the connection to J-Link LITE is good but the connection from the J-Link Lite is not working. I see two possible reasons:

• J-Link Lite requires 3.3V supply voltage on the target, so make sure the correct voltage is supplied to the custom board.
• The SWD interface is not connected correctly. The correct configuration is described here.

Also, how to connect a programmer to the Beacon kit is described on this thread.

[Greg Winn]

Stefan, Thank you for the answer, I have checked the SWD connection and all is correct on the custom board. I did have the board on battery power (~2.85v) while i was trying to program. I will connect a power supply for 3.3v and try again.