NRF52 DK RTT printf Problem

[byron8899]

Hi,

I recently purchased the NRF52 DK. I'm using the ble_uart_example for the SDK 11. I'm using the softdevice PCA10040.

I noticed the the SDK 11 includes the RTT c and h files there, so I don't need to worry about using the tutorial.

I want to test out the SEGGER_rtt_printf, but when I compile and link the project, it gave me an error saying.

"._build\nrf52832_xxaa_s132.axf: Error: L6218E: Undefined symbol SEGGER_RTT_printf (referred from main.o)."

So I defined it as #define SEGGER_RTT_printf, it compiles but it gives me 3 warnings that about expressions that have no effect. That one couldn't print anything on jlink rtt.

I read the documentation for the sdk11, but it didn't give me much help. I currently have the nrf51dk kit and it didn't have this error. And it worked fine.

What am I missing here?

Thanks

Update:

[Michael Dietz]

The examples worked for me. Make sure the source files SEGGER_RTT.c and SEGGER_RTT_printf.c are added to your project. You also need to add SEGGER_RTT_Syscalls_KEIL.c (which I think is your problem). If you are using GCC or IAR use the corresponding syscalls file. Once all of these source files are added to your project it should work.

If it still doesnt work download the latest segger software and documentation pack from here: www.segger.com/jlink-software.html and use these new files instead as they are more up to date and work for me.

dont define anything. you shouldnt have to and this will rpboably break something. unless you define this (NRF_LOG_USES_RTT=1 ) which has been very useful for me and is a great new feature in the nordic sdk.

[byron8899]

Hi Michael, No, I dont use GCC or IAR. Just Keil.
The project is already include "............\components\drivers_ext\segger_rtt". I did try adding the files the you mention before, but it gave me a bunch of L6200E errors. I did update the Jlink to 5.10f, after I open the file, and compile the project, it still throws me an error on "Undefined symbol SEGGER_RTT_printf" .

I guess I going to try uninstall everything including Keil and SEGGER. Unless you have other ideas.

[Michael Dietz]

just note that you actually have to manually copy the RTT files from the Jlink 5.10f folder to the external_librarires/segger_rtt folder in the sdk. just installing jlink wont do it. otherwise i dont know.. maybe look at retarget.c and make surenothing strange is messing things up there

[byron8899]

Oh I see. Now that makes a difference. I notice the file sizes are change. Finally it worked. Thank you so much.

You have a very happy holidays.

[Petter Myhre]

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