Adding ANT to BLE application

[Aftab]

Hello,

I have a gateway project where I need to receive data from BLE and send on ANT network. As a first step, I took the NUS or ble_app_uart and changed the softdevice from S140 to S340. The application is working correctly and NUS works fine with S340. For next step, I started adding ANT files (like ant_channel_config.c etc) looking at the multiprotocol example in the folder (with HRM functionality). The project seems to compile well except the following error codes, I cannot understand what can go wrong. I added all ANT related preprocessor defines from sdk_config.h of multiple protocol example into this project. There seems to be a linker issue but I am not sure what and where to change these linker settings.

Output/ble_app_uart_pca10056_s140 Release/Obj/nrf_sdh_ant.o:E:\xx\yy\nRF5_SDK_16.0\components\softdevice\common/nrf_sdh_ant.c:68: undefined reference to `__start_sdh_ant_observers'

Output/ble_app_uart_pca10056_s140 Release/Obj/nrf_sdh_ant.o:(.rodata.sdh_ant_observers+0x4): undefined reference to `__stop_sdh_ant_observers'

[Aftab]

Although I was able to compile the project correctly with this change but the project would not run on the dev board. I tried to debug but could not figure out where the problem is. Has anybody migrated his/her app from S140 to S340?

[Kenneth]

In general it may be easier to start off with a project setup with the correct softdevice and add the source file to that project:
\nRF5_SDK_17.0.2_d674dde\examples\multiprotocol\ble_ant_app_hrm\pca10056

You may consider opening the .emproject in notepad for S340 and S140 and compare for preprocessor defines, include files, and other configuration between the two.

Kenneth

[Aftab]

Thanks for the reply.

I have successfully added broadcast TX functionality in one of the project, here I wanted to add ANT broadcast RX functionality. Everything I have compared is same way. But there is something I am missing specific to the RX functionality I am trying to figure out.

[Kenneth]

Maybe the basic ANT RX and TX examples can be useful:

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ant_examples_broadcast.html

[Aftab]

I am taking RX, TX code from these broadcast examples.

[Kenneth]

The only thing I can think of is that you have not made sure that the 'channel_number' is different between the ANT channels you configure, e.g:

For TX make sure that sd_ant_channel_assign(0,....); sd_ant_channel_id_set(0,....); and so on
For RX make sure that sd_ant_channel_assign(1,....); sd_ant_channel_id_set(1,....); and so on

This 'channel_number' parameter is only a local handle and does not affect the on-air data. If you have more than 2 channels then increment the 'channel_number' further for each channel you configure (e.g. 2, 3, 4, 5, 6....).