CC2340R5: Zephyr build failure for CC2340R5 – “Missing DT chosen property for HCI” during Bluetooth sample build

Vaibhav Patil

Part Number: CC2340R5

Hi Team,

I’m trying to build the Zephyr Bluetooth sample periodic_adv_rsp for the LP-EM-CC2340R5 board using the latest Zephyr main branch.

Build command: west build -b lp_em_cc2340r5 -p always zephyr/samples/bluetooth/periodic_adv_rsp

However, the build fails with the following error:

error: static assertion failed: "Missing DT chosen property for HCI"
BUILD_ASSERT(IS_ENABLED(CONFIG_ZTEST), "Missing DT chosen property for HCI");


Complete build log: 

-- Board: lp_em_cc2340r5, qualifiers: cc2340r5
-- Zephyr version: 4.2.99
...
error: static assertion failed: "Missing DT chosen property for HCI"


It appears the sample expects a /chosen { zephyr,bt-hci = &uart0; }; entry in the device tree, but the CC2340R5 board DTS does not define one by default.

Questions:

For the CC2340R5 platform, should the Bluetooth stack be built as a self-contained controller (without external HCI), or is there a recommended HCI UART binding that needs to be added?
Is there a Zephyr configuration or overlay example available for CC2340R5 that correctly supports Bluetooth Periodic Advertising samples?
Should we modify the board DTS to include zephyr,bt-hci, or disable HCI-related configs in prj.conf?

Environment:

Board: LP-EM-CC2340R5
Zephyr SHA: (latest main branch, version 4.2.99)
Zephyr SDK: 0.16.8
west version: 1.5.0
Windows 10 x64

Regards

Vaibhav

15 days ago

0 Lea 15 days ago

TI__Expert 5960 points

Hi !

The reason why you are seeing this error is indeed because there is no chosen property for the HCI device. This is fixed in the downstream version of our Zephyr offering, where the bt_hci device has a chosen node. You can compare the board files from the upstream and the boardfiles from the downstream.

The difference between the upstream and the downstream of Zephyr is that we own our downstream, so we have shorter development cycles and push updates, features and fixes more quickly on the downstream. While are actively working to reduce the gap between the Zephyr upstream and the Zephyr downstream, I would recommend you to use the Zephyr downstream to fix your issue.

In order to get started with our downstream of Zephyr, I would advise you to follow this SimpleLink Academy guide about how to install and build your first Zephyr sample on the CC2340R5.

Kind regards,
Lea

0 Vaibhav Patil 15 days ago in reply to Lea

Intellectual 311 points

Thanks Lea for clarification. Do you have any Sample codes available like we have on freeRTOS based SDKs. I just wanted explore project structure and other things

Reagrds

Vaibhav

0 Vaibhav Patil 14 days ago in reply to Vaibhav Patil

Intellectual 311 points

Hi Lea/ E2E Forum,

Let me know, are below the valid resources for getting started with zephyr project?

Link 1: https://www.ti.com/technologies/wired-wireless-connectivity/bluetooth-low-energy/overview.html

Link 2: https://dev.ti.com/tirex/explore/content/simplelink_academy_for_cc23xx_8_40_01_00/_build_simplelink_academy_for_cc23xx_8_40_01_00/source/zephyr/cc2340rx_zephyr_board_porting.html

Regards

Vaibhav

0 Lea 14 days ago in reply to Vaibhav Patil

TI__Expert 5960 points

Hi !

I recommend you this SimpleLink Academy to get started with Zephyr on our downstream : https://dev.ti.com/tirex/content/simplelink_academy_for_cc23xx_8_40_01_00/_build_simplelink_academy_for_cc23xx_8_40_01_00/source/zephyr/cc23xx_zephyr_getting_started.html

In regards to examples, you should be able to build most of the samples in the sample of Zephyr.

Kind regards,
Lea

0 Vaibhav Patil 13 days ago in reply to Lea

Intellectual 311 points

Hi Lea,

I followed installation instruction : https://dev.ti.com/tirex/explore/content/simplelink_academy_for_cc23xx_8_40_01_00/_build_simplelink_academy_for_cc23xx_8_40_01_00/source/zephyr/cc23xx_zephyr_getting_started.html#zephyr-project-environment-setup

when i am trying to build using command, i am getting error as below:

Commands followed to get zyphyr downstreme:

cd %HOMEPATH%
python -m venv zephyrproject\.venv
zephyrproject\.venv\Scripts\activate

west init -m github.com/.../simplelink-zephyr --mr v3.7.0-ti-9.10.02_ea %HOMEPATH%\zephyrproject

Please Let me know, how to resolve this.

Regards

Vaibhav

0 Vaibhav Patil 11 days ago in reply to Vaibhav Patil

Intellectual 311 points

Hi Lea/ E2E forum,

Any Updates?

Regards

Vaibhav

0 Lea 8 days ago in reply to Vaibhav Patil

TI__Expert 5960 points

Hi ! Sorry for the late reply, I missed the notification for your message.

There are more steps to get the zephyr downstream. One of them is the installation of the Zephyr SDK. In your error message, West is failing to locate the SDK, since you did not install it.

In order to install it, you can follow the Zephyr SDK installation guide from Zephyr. I would also make sure that the steps you followed to install Zephyr are the ones that are given on the link I shared with you.

Kind regards,
Lea

0 Vaibhav Patil 8 days ago in reply to Lea

Intellectual 311 points

Hi Lea,

Could you clear, what steps i am missing here? Could you list all steps here, as the installation docs are not clear.

I already had python 3.X and west, installed on machine, so directly jumped to installation of downstream SDK.

Regards

Vaibhav

0 Lea 8 days ago in reply to Vaibhav Patil

TI__Expert 5960 points

Hi, the steps you are missing are the installation of the SDK.

Here are the commands you should run:

cd ~/zephyrproject
west update
west zephyr-export
pip install -r ~/zephyrproject/zephyr/scripts/requirements.txt
cd ~
wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.16.8/zephyr-sdk-0.16.8_linux-x86_64.tar.xz
wget -O - https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.16.8/sha256.sum | shasum --check --ignore-missing
tar xvf zephyr-sdk-0.16.8_linux-x86_64.tar.xz
cd zephyr-sdk-0.16.8
./setup.sh
sudo cp ~/zephyr-sdk-0.16.8/sysroots/x86_64-pokysdk-linux/usr/share/openocd/contrib/60-openocd.rules /etc/udev/rules.d
sudo udevadm control --reload

Kind regards,
Lea

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CC2340R5: Zephyr build failure for CC2340R5 – “Missing DT chosen property for HCI” during Bluetooth sample build