Debugging data from nrf51822

RE: Debugging data from nrf51822

endnode — Tue, 20 Jun 2017 08:46:47 GMT

Great, marking the right answer and closing the question would help future readers!:)

RE: Debugging data from nrf51822

Dhiraj — Mon, 19 Jun 2017 18:30:29 GMT

Hi endnode,

I did it using following this tutorial: devzone.nordicsemi.com/.../ I included segger`s file in main.c and using RTT viewer I am able to view data printed using SEGGER_RTT_WriteString(); function.

Thanks for your support.

RE: Debugging data from nrf51822

endnode — Sun, 18 Jun 2017 21:23:56 GMT

Well there are two ways how to use or repurpose SDW "programming" PINs but I'm afraid none o these will be available for you (at least from your description it sounds like only SWDCLK and SWDIO are used and these are fixed, no magic with them, also as I see nRF51 PIN layout these two options are not even supported by the chip):

Using SWO which is dedicated PIN for specific debugging printout protocol defined by ARM (supported by nRF52 but not supported by nRF51 from what I see).
Switching some "optional" SWD PINs such as nRESET to GPIO and configuring it as UART Tx to transport debugging messages to the host (this is nice trick on nRF52 but again nRF51 seems to have nRESET merged with SWDIO and no alternative GPIO function possible).

So if you really need some debug messaging I recommend to sacrifice some PIN from "motors, buzzer and others".

RE: Debugging data from nrf51822

Dhiraj — Sun, 18 Jun 2017 18:06:14 GMT

Sorry for making it confusing. I have a custom board in which raytacs MDBT40 is the core. All the gpios and other pins are used by motors, buzzer, and other peripheral. The only pins left to access are swd programming pins (swdclk,swdio). I am programming the board using jlink with swd programming. So it is possible to use same pins (swdio,swdclk) for debugging data? Like in arduino we connect arduino to pc uaing usb and open serial monitor to debug the data. So whether same is possible with jlink and MDBT40?

RE: Debugging data from nrf51822

endnode — Sun, 18 Jun 2017 13:26:10 GMT

Sorry but you make your question more and more confusing. Could you just tell us what you have, what you want to do, what you've tried and how/why it didn't work?

RE: Debugging data from nrf51822

Dhiraj — Sun, 18 Jun 2017 13:21:20 GMT

Thank you for the reply. However I have made a custom board and none of the pin is left to configure as tx and rx. So it is difficult to connect "FTDI serial to USB"converter to the board. Is it possible from SWD pins of the jlink?

RE: Debugging data from nrf51822

endnode — Thu, 15 Jun 2017 19:54:40 GMT

nRF Sniffer is for radio interface, that won't help with UART. If you have any mean how to connect to UART (serial) PINs on your board (e.g. popular FTDI "serial to USB" cable) then you can observe debug print outs in any terminal (e.g. PuTTY).