Can nRF5340 DK audio board just work as Host?

[John81]

Hi Nordic Team,

We want to verify controller functions on our own chip with core5.2, so I want to connect it with nRF5340 board by HCI uart, so that I can verify CIS or BIS functions of our chip.

So how can I realize it on nRF5340 DK audio board which works as Host?

Best regards,

Handom

[Karl Ylvisaker]

Hello Handom,

Please see the HCI UART example.

You will also need to add the following Kconfigs to your prj.conf:

CONFIG_NCS_INCLUDE_RPMSG_CHILD_IMAGE=n  # Make sure NCS build system won't build network core for us
CONFIG_BT_HCI_VS_EXT=n                  # Since we are not going to use Zephyr controller, so we have to disabled the VS command for Zephyr

Best regards,
Karl

[John81]

Hi Carl,

Thanks for your support, but I have another question for you, which pins should I connect as HCI UART pins, which can connect with a controller device?

I find there is only UART1, so is these pins used for HCI UART? Thanks.

TP60	P1.04	UART1 RXD
TP61	P1.05	UART1 TXD
TP62	P1.06	UART1 CTS
TP63	P1.07	UART1 RTS

Best regards,

Handom

[Karl Ylvisaker]

Hello Handom,

John81 said:

Thanks for your support

No problem at all, I am happy to help! :) 

John81 said:

I find there is only UART1, so is these pins used for HCI UART? Thanks.

It uses the UART0 by default:

&uart0 {
	status = "okay";
	current-speed = <115200>;
	pinctrl-0 = <&uart0_default>;
	pinctrl-1 = <&uart0_sleep>;
	pinctrl-names = "default", "sleep";
};

Best regards,
Karl

[John81]

Hi Karl,

Thanks for your reply. But I am not sure where is uart0 pins on the board, could you please show them to me? thanks.

Best regards,

Handom

[Håkon Alseth]

Hi Handom,

 

The default uart output can be viewed in the board itself, for instance here:

https://github.com/nrfconnect/sdk-nrf/blob/main/boards/arm/nrf5340_audio_dk_nrf5340/nrf5340_audio_dk_nrf5340_cpuapp_common-pinctrl.dtsi

Please note that for both the nRF53-DK and the audio-DK, the default uart0 is routed to an external USB/UART bridge.

 

To change the pins for uart0 you can create the file my_project/boards/($BOARD).overlay

As an example, if the board is nrf5340_audio_dk_nrf5340, then the path is:

../my_project/boards/nrf5340_audio_dk_nrf5340_cpuapp.overlay

 

Here's an example on how the pin-out can be changed:

&pinctrl {
	uart_0_my_pinout: uart_0_my_pinout {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 9)>,
				<NRF_PSEL(UART_RX, 1, 8)>,
				<NRF_PSEL(UART_RTS, 0, 31)>,
				<NRF_PSEL(UART_CTS, 1, 0)>;
		};
	};

	uart_0_my_pinout_sleep: uart_0_my_pinout_sleep {
		group1 {
			psels = <NRF_PSEL(UART_TX, 1, 9)>,
				<NRF_PSEL(UART_RX, 1, 8)>,
				<NRF_PSEL(UART_RTS, 0, 31)>,
				<NRF_PSEL(UART_CTS, 1, 0)>;
			    low-power-enable;
		};
	};
};

&uart0 {
	status = "okay";
	current-speed = <115200>;
	pinctrl-0 = <&uart_0_my_pinout>;
	pinctrl-1 = <&uart_0_my_pinout_sleep>;
	pinctrl-names = "default", "sleep";
};

 

Remember to re-generate the build (ie. delete the build-catalog and create a new one) after making changes to the DT overlay.

 

Kind regards,

Håkon