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Nino, Veit, Many thanks for the sound advice. The clarification of which linkers use which formats was the info I needed I guess it begs the question: Which linker should I choose for a Nordic 51822 application? Rob

What is the current best practice? I am using Segger Embedded Studio v4.12 for programming a Nordic 51822 application (SDK 12.3) and need to configure the section placement file Information on the Segger wiki discusses use of linker scripts (*.icf) wiki.segger.com/Porting_from_GCC_to_SEGGER_Linker But documentation from Nordic and in the Segger Manual suggest use of flash_placement.xml files studio.segger.com/index.htm?ht…placement_file_format.htm Advice from Nordic for importing a Keil project …

Removing the lines from thumb_crt0.s made no difference to printf However I could no longer find the HELPER lines in the disassembler window showing that the modified files had been compiled Back to the drawing board! Rob

Thankyou for this suggestion; I hit a snag. _DoInit is a called through macro INIT() in Segger_RTT.c. However in my configuration INIT() is not called; I cannot add breakpoints in the INIT() block. Not sure why. RTT is enabled in debug options. And indeed printf directs to the debug terminal When I look at the assembler code for start() - attached file I see the following order of execution: Cortex_M_Startup.s SEGGER_THUMB_Startup.s system_nrf51422.c This seems like a candidate for the problem -…

Jev Belated thanks for the sound advice. Unfortunately it did not fix it. I found a similar suggestion from Nordic: devzone.nordicsemi.com/f/nordi…default_mode-blocking-app I get the same problem when I include the lines below in in sdk_config.h. The printf statement prevents the code running without an RTT console Source Code (25 lines)

When debugging, printf directs to the debug terminal - the app seems to function When I build a release version I need to comment out printf otherwise the app will freeze How can I redirect printf output to the com port so as to prevent this? How is stdio set in the ses environment? (I am using a JLINK Edu with a Nordic development board to develop an app using a UART for serial comms) Many thanks for any help Rob

Nino Thanks for your help. I'll check with Nordic Rob

I am tracing a problem with an app running on a Cortex M0 using a JLink debugger and have been trying to analyse a hard fault. Execution freezes. If I pause exceution the call stack indicates HardFaultHandler() as the last function called and a call address in the vector table. The call address is ExternalISR9 rather than the address of the HardFault_Handler ???!!! Segger provides HardFaultHandler code which I've compiled and linked. However when the hard fault occurs, the code is not invoked. F…

Using Segger Embedded Studio what is the best practice for configuring the debugger for an app with interrupts(PWM for NRF51822)? For example: - are there any files that should be added to the project that assist debugging? - is it possible/useful to mask interrupts to facilitate debugging – if so, how? Many thanks for any help pS