Error compiling lpn example from BLE Mesh v5.0.0

[Rajendra]

Hello,

I am working on BLE MESH using nRF52840. I am trying to put nRF52840 into deep sleep mode. For this I am referring to lpn example in BLE Mesh which makes use of Friend Node. As per documentation, using Friend Node it is possible to put node in Deep Sleep.

My setup:
nRF SDK ver : nRF5_SDK_17.0.2_d674dde
BLE MESH ver : nrf5_SDK_for_Mesh_v5.0.0
Hardware : BT840 based custom board

I am tryting to compile lpn example from examples - nrf5_SDK_for_Mesh_v5.0.0\examples\lpn. It looks like the example needs some modification in order to compile. The example shows this error while compiling.

..\nrf5_sdk_17.0.2_d674dde\modules\nrfx\drivers\include\nrfx_power_clock.h:67:6: error: #error "This code is not supposed to be compiled when neither POWER nor CLOCK is enabled."
67 | #error "This code is not supposed to be compiled when neither POWER nor CLOCK is enabled."

POWER_ENABLED and NRFX_POWER_ENABLED is already 1 in the example code. So upon enabling macros NRF_CLOCK_ENABLED and NRFX_CLOCK_ENABLED or it shows further compilation errors. I was wondering if this is a right way to go about it.

nRF5_SDK_17.0.2_d674dde/external/segger_rtt/SEGGER_RTT_Conf.h:86:46: error: 'SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS' undeclared here (not in a function); did you mean 'SEGGER_RTT_MAX_NUM_DOWN_BUFFERS'?
86 | #define SEGGER_RTT_MAX_NUM_DOWN_BUFFERS (SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS) // Max. number of down-buffers (H->T) available on this target (Default: 3)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../nRF5_SDK_17.0.2_d674dde/external/segger_rtt/SEGGER_RTT_Conf.h:86:46: note: in definition of macro 'SEGGER_RTT_MAX_NUM_DOWN_BUFFERS'
86 | #define SEGGER_RTT_MAX_NUM_DOWN_BUFFERS (SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS) // Max. number of down-buffers (H->T) available on this target (Default: 3)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Kindly let me know the changes/modification required to compile lpn example.

Best Regards,

Rajendra

[tesc]

Hi,

The LPN example project for the nRF52840 DK builds fine in my end, using the Segger Embedded Studio project lpn_nrf52840_xxAA_s140_7_2_0.emProject.

Your second error message mentioning nRF5_SDK_17.0.2_d674dde/external/segger_rtt/SEGGER_RTT_Conf.h is a bit suspicious, as in my project the path to that file is nrf5_SDK_for_Mesh_v5.0.0_src/external/rtt/include/SEGGER_RTT_Conf.h. What (if anything) have you done to the example, and what toolchain are you using?

Regards,
Terje

[Rajendra]

Hi,

I am using eclise as an IDE, gcc-arm-none-eabi-10-2020-q4-major compiler and build tools 2.12-20190422-1053.
Using these tools I am able to build and run light_switch\client and light_switch\server.

I have copied lpn example from examples folder to local folder and trying to compile it. I have followed same mechanism for light_switch\client and light_switch\server, which are running fine.
I am also confused about SEGGER_RTT_Conf related error.

Regards,
Rajendra

[Rajendra]

There were two different versions of SEGGER_RTT_Conf being referred, one from nrf5_SDK_for_Mesh_v5.0.0 and other from nRF5_SDK_17.0.2_d674dde. I modified my .cmake file to use SEGGER_RTT_Conf from nrf5_SDK_for_Mesh_v5.0.0. Now I am able to compile the code.

However as the earlier error message suggested (#error "This code is not supposed to be compiled when neither POWER nor CLOCK is enabled.") I have enabled following in sdk_config.h.

#define NRFX_CLOCK_ENABLED 1
#define NRF_CLOCK_ENABLED 1

Now, I will test it and check for the Friend Functionality.

Regards,
Rajendra

[tesc]

Hi,

Thank you for the update. I was about to suggest checking the include directories (for choosing correct SEGGER_RTT_Conf.h) and see now that that is exactly what you did to fix that issue.

Regarding the other issue, I have not seen any similar issues with that example before, so I suspect something is wrong with what you copied over. Are you able to build the unchanged example in the original location, as described in Building the stack and examples?

Regards,
Terje