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

[Abhinav152]

okay thanks for clarification

[Abhinav152]

Okay i had used the correct value before, 0xff came in experimentation . here is the correct set values as per Bluetooth Core Specification 6.0, Vol 4, Part E, 7.8.137
`LE CS Create Config command`

cmd->conn_handle = 1e
cmd->config_id = 0
cmd->create_context = 1
cmd->main_mode_type = 1
cmd->sub_mode_type = ff
cmd->min_main_mode_steps = 2
cmd->max_main_mode_steps = 5
cmd->main_mode_repetition = 0
cmd->mode_0_steps = 3
cmd->role = 0
cmd->rtt_type = 0
cmd->cs_sync_phy = 1
cmd->channel_map_repetition = 0
cmd->channel_selection_type = 0
cmd->ch3c_shape = 0
cmd->ch3c_jump = 2


Could you please find anything wrong in those params?

[ivan iushkov]

can you please provide the error code returned by Controller for this configuration?

[Abhinav152]

Yes, following is the error code 

ogf=0x08, ocf=0x0090, hci_err=0x212 : BLE_ERR_INV_HCI_CMD_PARMS (Invalid HCI Command Parameters)

[ivan iushkov]

can you also provide `Channel_Map` value please?

[Abhinav152]

Hi , Foloowing are my channel map values 


cmd->conn_handle = 1e
cmd->config_id = 0
cmd->create_context = 1
cmd->main_mode_type = 1
cmd->sub_mode_type = ff
cmd->min_main_mode_steps = 2
cmd->max_main_mode_steps = 5
cmd->main_mode_repetition = 0
cmd->mode_0_steps = 3
cmd->role = 0
cmd->rtt_type = 0
cmd->cs_sync_phy = 1
cmd->channel_map_repetition = 0
cmd->channel_selection_type = 0
cmd->ch3c_shape = 0
cmd->ch3c_jump = 2
cmd->channel_map[0] = a
cmd->channel_map[1] = fa
cmd->channel_map[2] = cf
cmd->channel_map[3] = ac
cmd->channel_map[4] = fa
cmd->channel_map[5] = c0
cmd->channel_map[6] = 0
cmd->channel_map[7] = 0
cmd->channel_map[8] = 0
cmd->channel_map[9] = 0

[Abhinav152]

Also, i tried with the values provided by NRF example using the below way but it didn't work. In this case all channel map values are 0

BT_LE_CS_CHANNEL_BIT_SET_VAL(cmd.channel_map, 0, 0);

BT_LE_CS_CHANNEL_BIT_SET_VAL(cmd.channel_map, 1, 0);

BT_LE_CS_CHANNEL_BIT_SET_VAL(cmd.channel_map, 23, 0);

BT_LE_CS_CHANNEL_BIT_SET_VAL(cmd.channel_map, 24, 0);

BT_LE_CS_CHANNEL_BIT_SET_VAL(cmd.channel_map, 25, 0);

BT_LE_CS_CHANNEL_BIT_SET_VAL(cmd.channel_map, 77, 0);

BT_LE_CS_CHANNEL_BIT_SET_VAL(cmd.channel_map, 78, 0);

BT_LE_CS_CHANNEL_BIT_SET_VAL(cmd.channel_map, 79, 0);

[ivan iushkov]

I am not sure exactly but I see at least two values not allowed by Spec:

- channel_map_repetition is allowed to be in the range from 1 to 0xff

- channels 1 and 23 are not allowed to be used during Channel sounding procedure.

Can you try to disable channel 1 and 23 by setting

cmd->channel_map[0] = 0x08
cmd->channel_map[2] = 0x4f

and see if it helps please?

[Abhinav152]

Thanks for rectifying the issues. I want to test the LE securotuy mode for the CS feature 


Can you tell me how the NRF controller supports this Cs procedure and whether the controller sends any  event to the host so that security levels can be checked? Also i want to set this security level. I tried searching in the NRF code, but can you help to locate how sample examples has set the security level

[Simonr]

Hi

We're moving out of the scope of this ticket now I think, and you should consider creating a new ticket if you need further help with this, but Channel sounding security is handled in the cs.h file with the bt_le_cs_security_enable() function or in sdc_hci_cmd_le.h file with the sdc_hci_cmd_le_cs_security_enable() function depending on what Bluetooth controller you're using (Zephyr or SoftDevice controller).

Best regards,

SImon