How to use nrf54L15-dk with external host through hci uart application

[Abhinav152]

Hi, 

I am trying to build an application using the nrf54L15-dk board and want to use the board as a controller. I run the application on the external host but got an error as controller responsive. Can you provide the details steps so that board can be use with external host.

[Simonr]

Hi

Can you share some details on what sample project you're based your own project on here? And what UART instance and pins on the nRF54L15 are you using for HCI UART here? Please note that some of the pins are not available on the DK, and the different instances have a set amount of pins that can be used (specific ports).

Is either of these the sample you've based your project on by chance?

• Bluetooth: HCI UART
• HCI UART

Best regards,

Simon

[Abhinav152]

Hi,
Thanks for your response.
i am using the hci_uart application of Zephyr.

Following is the nrf54l15dk_nrf54l15_cpuapp.overlay file i am using

&uart20 {

current-speed = <115200>;

hw-flow-control;

status = "okay";

};

&uart20_default {

group1 {

psels = <NRF_PSEL(UART_TX, 1, 11)>,

<NRF_PSEL(UART_RTS, 0, 2)>;

};

group2 {

psels = <NRF_PSEL(UART_RX, 1, 10)>,

<NRF_PSEL(UART_CTS, 0, 3)>;

bias-pull-up;

};

};



Also, i want to use a channel-sounding feature hence please suggest the necessary flag to enable this. Following is proj.conf file

CONFIG_CONSOLE=n

CONFIG_STDOUT_CONSOLE=n

CONFIG_UART_CONSOLE=n

CONFIG_GPIO=y

CONFIG_SERIAL=y

CONFIG_UART_INTERRUPT_DRIVEN=y

CONFIG_BT=y

CONFIG_BT_HCI_RAW=y

CONFIG_BT_HCI_RAW_H4=y

CONFIG_BT_HCI_RAW_H4_ENABLE=y

CONFIG_BT_BUF_ACL_RX_SIZE=255

CONFIG_BT_BUF_CMD_TX_SIZE=255

CONFIG_BT_BUF_EVT_DISCARDABLE_SIZE=255

CONFIG_BT_CTLR_ASSERT_HANDLER=y

CONFIG_BT_MAX_CONN=16

CONFIG_BT_CTLR_DTM_HCI=y

CONFIG_BT_CTLR_ADV_EXT=y

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=512

[ivan iushkov]

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrfxlib/softdevice_controller/doc/channel_sounding.html#developing_with_cs suggests the following KConfig option to enable Channel Sounding:

CONFIG_BT_CTLR_CHANNEL_SOUNDING=y

[Abhinav152]

Hi ivan iushkov,

I just tried these flags but giving a warning as the flag can't be enabled. Required BT_CTLR_CHANNEL_SOUNDING_SUPPORT  is warning. If i tried to allow this flag to but got an error that the flag is not user configurable  

[ivan iushkov]

can it be that you are using the old version of NCS without CS support?

[Abhinav152]

NCS Toolchain 2.6.20240605.1004412633878 for building.  I am not sure if this supports the CS feature. Can you please confirm the minimum required version

[ivan iushkov]

sorry, I've meant version of nRF Connect SDK itself, not the toolchain.

I think you can check it by executing "git status" or "git log" command in the "nrf_sdk/nrf" folder.
You need at least version 2.8.0 or 2.9.0 according to Changelog.

But perhaps it is even better if you just use the latest release candidate version v3.0.0-RC1. You can do it by running the following commands

1. git fetch --all

2. git checkout v3.0.0-rc1

3. west update

Or from GUI if you prefer that