nrf52840 C and C++ Combined

RE: nrf52840 C and C++ Combined

aplatts — Thu, 06 Aug 2020 13:49:50 GMT

Thanks, been on another project. I'll look back into this issue next week.

RE: nrf52840 C and C++ Combined

aplatts — Wed, 17 Jun 2020 10:52:12 GMT

Hi Simonr

How do I add the 'reset-handler' entry point within my linker script?

Thanks

RE: nrf52840 C and C++ Combined

Torsten Robitzki — Wed, 17 Jun 2020 09:58:06 GMT

I would set the environment variable VERBOSE, to force make to print the command line tool invocations. Reset_Handler() should usually be implemented in the startup files and should have C binding. So, you should make sure, that the startup file is compiled, is compiled by a C compiler (not a C++ compiler) and that the resulting object file is linked into your binary. Looking into the map file might give hints to whether the Reset_Handler() is linked in a C function or as C++ function.

RE: nrf52840 C and C++ Combined

Simonr — Wed, 17 Jun 2020 08:23:15 GMT

Hi Andrew

Can you make sure your Linker entry point is set to reset_handler, and that the debugger setting "Start From Entry Point Symbol" is set to No in your application? Depending on which development environment you're using, where you set these settings vary. This is in order to make sure we enter the SoftDevice's reset_handler() and not the application's.

Best regards,

Simon

RE: nrf52840 C and C++ Combined

aplatts — Tue, 16 Jun 2020 13:39:39 GMT

Same result, with or without the space:

Linking target: nrf52840_xxaa.out
/Users/andrewplatts/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: warning: cannot find entry symbol Reset_Handler; defaulting to 0000000000027000

RE: nrf52840 C and C++ Combined

Dmitry — Fri, 12 Jun 2020 20:28:49 GMT

Hmm.. is there a line ''Assembling file: ..../modules/nrfx/mdk/gcc_startup_nrf52840.S" in build log?

I don't have VSC IDE, but the same line without space after "abspath" produces an empty output under my linux build environment.

RE: nrf52840 C and C++ Combined

aplatts — Fri, 12 Jun 2020 16:22:00 GMT

Hi Dmitry

The file is found so the MakFile structure is correct.

RE: nrf52840 C and C++ Combined

Dmitry — Thu, 11 Jun 2020 16:09:41 GMT

Hi,

seems there's a space missing at line 135:

ASM_SOURCE_FILES = $(abspath $(SDK_ROOT)/modules/nrfx/mdk/gcc_startup_nrf52840.S)

RE: nrf52840 C and C++ Combined

aplatts — Thu, 11 Jun 2020 13:57:59 GMT

Hi Simon

Yes, it is the original from the SDK (attached).

devzone.nordicsemi.com/.../gcc_5F00_startup_5F00_nrf52840.S

RE: nrf52840 C and C++ Combined

Nguyen Hoan Hoang — Thu, 11 Jun 2020 12:09:14 GMT

27000 is exactly where you firmware starts when using it with Softdevice S140. It is defined in the linker script.

RE: nrf52840 C and C++ Combined

Nguyen Hoan Hoang — Thu, 11 Jun 2020 12:08:44 GMT

It's C++ over the SDK. The SDK is required as it is stated in the README.md

RE: nrf52840 C and C++ Combined

Simonr — Thu, 11 Jun 2020 12:00:00 GMT

Hi Andrew

Can you check that the startup file that is used in your project is identical to the one provided in our SDK?

Best regards,

Simon

RE: nrf52840 C and C++ Combined

aplatts — Wed, 10 Jun 2020 11:11:57 GMT

Hi Simor.

Apologies I have been diverted by another project. Back on this issue now.

The only reference within the MakeFile to _startup_nrf52840.S is within the ASM_SOURCE_FILES:

#assembly files common to all targets
ASM_SOURCE_FILES = $(abspath$(SDK_ROOT)/modules/nrfx/mdk/gcc_startup_nrf52840.S)

The folder 'modules/nrfx/mdk/ is part of the SDK and contains many variants of _startup_nrf*****.S files. Not sure why this is an issue.

I still get the following compile error:

-/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: warning: cannot find entry symbol Reset_Handler; defaulting to 0000000000027000

Please advise.

Thanks

RE: nrf52840 C and C++ Combined

Simonr — Tue, 26 May 2020 08:59:02 GMT

Please make sure that you don't have any additional _startup_nrf52840.s files in your project, as we've seen this error before due to conflicting startup files.

Best regards,

Simon

RE: nrf52840 C and C++ Combined

aplatts — Mon, 25 May 2020 15:05:56 GMT

Hi Nguyen

Thanks, but it isn't the advice i was looking for: 'use another SDK'. I prefer to use the manufactures SDK.

I understand what the error is, but I don't know how to resolve it with SDK16.

RE: nrf52840 C and C++ Combined

Nguyen Hoan Hoang — Sat, 23 May 2020 15:29:38 GMT

Sorry I didn't see the error. It is cause by the missing startup code. Somehow the linker did not find it.

if you wish to use C++ with the SDK, checkout this library https://github.com/IOsonata/IOsonata. It supports different ARM vendors including the nRF series

RE: nrf52840 C and C++ Combined

aplatts — Sat, 23 May 2020 14:45:17 GMT

Hi Nguyen

I'll try that, but not sure how that will fix this issue:

Compiling file: main.cpp
Linking target: nrf52840_xxaa.out
/Users/home/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld: warning: cannot find entry symbol Reset_Handler; defaulting to 0000000000027000
Preparing: nrf52840_xxaa.bin
Preparing: nrf52840_xxaa.hex

This is a compile error of the main code nothing to do with the SD.

Thanks

Andrew

RE: nrf52840 C and C++ Combined

Nguyen Hoan Hoang — Fri, 22 May 2020 18:17:19 GMT

Flashing softdevice and firmware separately might not work. Try use mergehex to merge them together.

RE: nrf52840 C and C++ Combined

aplatts — Fri, 22 May 2020 16:34:44 GMT

Hi Patrick

It is included (see line 134 of MakeFile):

#assembly files common to all targets
ASM_SOURCE_FILES = $(abspath$(SDK_ROOT)/modules/nrfx/mdk/gcc_startup_nrf52840.S)

Thanks

Andrew

RE: nrf52840 C and C++ Combined

Patrick — Fri, 22 May 2020 16:23:16 GMT

Make sure you have included gcc_startup_nrf52840.S, located in modules/nrfx/mdk, in your project.