nRF52840 with #error "Clock source is not supported or not defined"

[Joonho Jang]

Hi, 

I keep running into an error with the following output when building the configuration for nRF52840. I thought my prj.conf would fix the issue, however, the error still seems to persist. Note: The code i'm trying to run is l4_e2_sol from NordicDevAcademy Bluetooth Fundamentals. You can find the l4_e2_sol in this link. 

 In function 'm_config_clock_source_get':
/opt/nordic/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:335:10: error: #error "Clock source is not supported or not defined"
  335 |         #error "Clock source is not supported or not defined"
      |          ^~~~~
/opt/nordic/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c: In function 'mpsl_lib_init_internal':
/opt/nordic/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:377:34: error: 'CONFIG_CLOCK_CONTROL_NRF_ACCURACY' undeclared (first use in this function); did you mean 'CONFIG_CLOCK_CONTROL_NRF_FORCE_ALT'?
  377 |         clock_cfg.accuracy_ppm = CONFIG_CLOCK_CONTROL_NRF_ACCURACY;
      |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                  CONFIG_CLOCK_CONTROL_NRF_FORCE_ALT
/opt/nordic/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:377:34: note: each undeclared identifier is reported only once for each function it appears in
ninja: build stopped: subcommand failed.

My prj.conf looks like this: 

#
# Copyright (c) 2018 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

CONFIG_CLOCK_CONTROL_NRF=y
CONFIG_CLOCK_CONTROL=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_20PPM=y

# Logger module
CONFIG_LOG=y

# Button and LED library
CONFIG_DK_LIBRARY=y

# Bluetooth LE
CONFIG_BT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="MY_LBS2"

# Increase stack size for the main thread and System Workqueue
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
CONFIG_MAIN_STACK_SIZE=2048

[Amanda Hsieh]

Hi, 

I cannot reproduce the issue with https://github.com/NordicDeveloperAcademy/ncs-fund/tree/main/l4/l4_e2_sol. Please check it out. 

Regards,
Amanda H.

[Joonho Jang]

Hi Amanda, 

The code I tested is in bt-fund not ncs-fund directory. Please try this github link instead. Thank you. 

https://github.com/NordicDeveloperAcademy/bt-fund/tree/main/l4/l4_e2_sol

Kind Regards, 

Joonho Jang 

[Amanda Hsieh]

I added your configs in the build configuration and don't get the build error. Try to run "west update" under opt/nordic/ncs/v3.0.2 and delete the build folder to build again. 

[Joonho Jang]

Hi Amanda, 

I've attempted do what you said and it didn't work for me. However, I managed to make it build by changing the clock status to "okay" in the nrf52840dk_nrf52840.dts. Is this disabled for you as well by default? 

Also, thank you for helping me out!

[LinJunXuan]

I am also mpsl_init. c
C:/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c: In function 'm_config_clock_source_get':
C:/ncs/v3.0.2/nrf/subsys/mpsl/init/mpsl_init.c:335:10: error: #error "Clock source is not supported or not defined"
335 | #error "Clock source is not supported or not defined"
I don't understand. I used the NRF54L15 development board to follow the official Bluetooth routine and create the nrf54l15dk/nrf54l15/dapp/ns board, but it just reported an error. I don't understand. It was during the final compilation that the error occurred, and I didn't make any changes

[Joonho Jang]

Hi LinJunXuan, 

Yea, this was weird for me as well. Not sure if this was a bug or I unknowingly made some modifications to v3.0.2 which caused this error. 

If you do want to resolve this issue, double check if &clock in the nRF54L15DK device tree overlay has the status = "okay" instead of "disabled". This may resolve your compiling issue. 

[LinJunXuan]

Thanks