Enabling the UART through the J-Link Lite interface

RE: Enabling the UART through the J-Link Lite interface

dbuijsma — Fri, 09 Sep 2016 17:51:31 GMT

Please note that the newer J-Link versions include a Virtual Comport which you can enable using J-Link Configurator. I am not sure if this is the case with the Lite models, but you can check. In the Segger JLink manual, check 14.1.3 Pinout for SWD + Virtual COM Port (VCOM).

RE: Enabling the UART through the J-Link Lite interface

Ole Morten — Tue, 08 Oct 2013 06:28:08 GMT

If you want to include a Segger chip on your own board, you should contact them directly. Their website is http://www.segger.com, and has contact information on it.

RE: Enabling the UART through the J-Link Lite interface

aaronxu — Fri, 04 Oct 2013 21:48:24 GMT

Hi ole, Where can I buy that segger chip?

RE: Enabling the UART through the J-Link Lite interface

Steven Wik — Fri, 04 Oct 2013 13:39:52 GMT

Hi,

As Ole suggests, you need to convert the UART TTL to a USB interface to communicate with a PC. I would recommend purchasing a cable or breakout USB board from FTDI.

The products I'm referring to can be found here. You can find most of these at Digikey for ~$20USD. I'm currently using the TTL-232R-3V3 cable to connect to my custom nRF51822 board and am able to communicate with no errors at speeds up to 921 kbaud.

Hope this helps!

Cheers, Steve

RE: Enabling the UART through the J-Link Lite interface

Ole Morten — Fri, 04 Oct 2013 13:28:45 GMT

As it seems you have found out, the Segger chip on the Evaluation Kit has an additional feature of showing up as a serial port, and transmits the data received on the separate UART interface from the nRF51822 to the PC.

The J-Link Lite does not have such feature, and if you need to get UART data from your custom board, you have to use some other UART-to-RS232 converter and connect it to pins configured as UART on your nRF51822.

Since the nRF51822 does not have any tracing hardware, there is unfortunately not any other way to get UART data over.

RE: Enabling the UART through the J-Link Lite interface

Jim — Thu, 03 Oct 2013 19:53:15 GMT

So, I hadn't realized the PCA10001 has special hardware on it to connect to the NRF51822 UART pins. I had assumed this was being done via some kind of emulation of a serial port.

Is there a debug channel of some kind I can access through the SWD pins? It seems like I have enough connections between the chip and my PC, just need a little bit of software.