SDK 14.2.0, app_uart not finding its own function?

RE: SDK 14.2.0, app_uart not finding its own function?

Ladasky — Sat, 20 Oct 2018 04:13:55 GMT

[quote userid="8037" url="~/f/nordic-q-a/30008/sdk-14-2-0-app_uart-not-finding-its-own-function/119445"]Perhaps there are some flags in other files which override what I expected.[/quote]

Following up once again to myself: the file in question would appear to be sdk_config.h! An incorrectly written sdk_config.h seems to be the source of many unexpected linker errors. It can be quite challenging to get sdk_config.h just right.

RE: SDK 14.2.0, app_uart not finding its own function?

Ladasky — Thu, 01 Feb 2018 23:33:59 GMT

Following up to myself: whatever the problem was, it was my fault. I started over again from scratch with the SDK 14.2 UART example, modifying both its main.c and the Makefile, and I was able to complete the build.

The strange thing is that simply including and building app_uart doesn't seem to be enough to define the reference to app_uart_init(), even though I can see quite clearly that it is in fact defined there. Perhaps there are some flags in other files which override what I expected.

RE: SDK 14.2.0, app_uart not finding its own function?

RK — Tue, 30 Jan 2018 23:39:16 GMT

make -n will print out what make is going to do without doing it make VERBOSE=1 should print as it goes

all else fails put a shell script called 'ld' in your path which just prints its arguments and exits then make and see what it prints.

you need the link line so you can run it by hand and figure out what's missing.

RE: SDK 14.2.0, app_uart not finding its own function?

Ladasky — Tue, 30 Jan 2018 23:28:11 GMT

Message 2: I looked through the make log for the terms "link" and "must remake". They only appear once each, at the very end, right before the failure:

Finished prerequisites of target file '_build/nrf52832_xxaa.out'.
    Must remake target '_build/nrf52832_xxaa.out'.
Linking target: _build/nrf52832_xxaa.out
Putting child 0x55797f87e710 (_build/nrf52832_xxaa.out) PID 3537 on the chain.
Live child 0x55797f87e710 (_build/nrf52832_xxaa.out) PID 3537 
Reaping winning child 0x55797f87e710 PID 3537 
Live child 0x55797f87e710 (_build/nrf52832_xxaa.out) PID 3539 
Reaping losing child 0x55797f87e710 PID 3539 
/home/john/src/nRF5_SDK_14.2.0/components/toolchain/gcc/Makefile.common:292: recipe for target '_build/nrf52832_xxaa.out' failed
Removing child 0x55797f87e710 PID 3539 from chain.

RE: SDK 14.2.0, app_uart not finding its own function?

Ladasky — Tue, 30 Jan 2018 23:23:42 GMT

Hello RK, thanks for your reply. I have modified Makefiles, but I haven't had to debug a make command at this level of detail before. For your information, I'm modifying the Makefile from the UART demo in the SDK 14.2 examples folder. I am not attempting to re-use an SDK 12.3 Makefile, as I can see that quite a bit has changed. For example, I've noticed that the _build folder that SDK 14.2 makes is organized a little differently, now there's a subfolder, nrf52832_xxaa. I directed the output of a make -d command into a log file, which ended up being 250K long. I found 50 references in that log file to app_uart.c.o. I'm not sure what error I might be looking for. The last referenced line reads: No need to remake target '_build/nrf52832_xxaa/app_uart.c.o'. .

RE: SDK 14.2.0, app_uart not finding its own function?

RK — Tue, 30 Jan 2018 05:15:43 GMT

my guess would be that you don't have app_uart_c.o on the link line. Can you get a verbose make output?