RE: Serial Example help

matty — Fri, 25 Sep 2020 19:41:27 GMT

Thank you. I didn't understand what was meant by "nRF domain" now I do.

RE: Serial Example help

Jørgen Holmefjord — Fri, 25 Sep 2020 15:02:31 GMT

Hi,

1. Have you tried swapping the TXD and RXD pins? I'm not sure about the FTDI device you are using, but normally UART are connected TXD<-->RXD and RXD<-->TXD. This could explain why you could see the character from the J-Link USB COM port.

2. How do you determine that the board is not powered? Note that these ways of supplying power to the board only powers the nRF domain, not the J-Link OB interface MCU. LED5 will for instance not work. I tested that it is working on my DK by flashing a BLE sample to the board before swapping from J2 USB power to J3/P21 power supply, and it is advertising as expected when checking with nRF Connect app on my phone.

Best regards,
Jørgen