Central and Peripheral UART Samples on UART2 - nRF5340 Audio DK

RE: Central and Peripheral UART Samples on UART2 - nRF5340 Audio DK

fweinrebe — Fri, 26 May 2023 06:46:16 GMT

Thank you very much. It is working 100%. Much appreciated. :-)

RE: Central and Peripheral UART Samples on UART2 - nRF5340 Audio DK

dejans — Thu, 25 May 2023 10:58:48 GMT

Hi,

In the file nrf5340_audio_dk_nrf5340_cpuapp_common.dts you can see that pins P1.08 and P1.09 are forwarded to the network core. Looking at the connector interface for audio hardware, there are pins P1.12 and P1.13 which could be used in your case. In the psels lines of the pinctrl section, you could try replacing pins P1.08 and P1.09 with pins P1.12 and P1.13. It would look like something like this:

psels = <NRF_PSEL(UART_RX, 1, 12)>,
        <NRF_PSEL(UART_TX, 1, 13)>;

Best regards,
Dejan

RE: Central and Peripheral UART Samples on UART2 - nRF5340 Audio DK

fweinrebe — Wed, 24 May 2023 12:39:01 GMT

Thanks Dejan for your post.

Unfortunately, it's still not working. What I do get is a "*** Booting Zephyr OS Build v3.2.99-ncs2 ***" message on UART 2 on both boards when I reset the DK. Otherwise no data on UART2 (and UART0).

On Central UART I did the following:

Changed in main.c the line referring to UART0 to:

static const struct device *uart = DEVICE_DT_GET(DT_NODELABEL(uart2));

On Peripheral UART I did the following:

In nrf5340_audio_dk_nrf5340_cpuapp.overlay I added:

/ {

chosen {

nordic,nus-uart = &uart2;

};

&uart2 {

status = "okay";

current-speed = <115200>;

pinctrl-0 = <&uart2_default_alt>;

pinctrl-1 = <&uart2_sleep_alt>;

pinctrl-names = "default", "sleep";

};

&gpiote {

interrupts = <13 NRF_DEFAULT_IRQ_PRIORITY>;

};

&pinctrl {

uart2_default_alt: uart2_default_alt {

group1 {

psels = <NRF_PSEL(UART_RX, 1, 8)>,

<NRF_PSEL(UART_TX, 1, 9)>;

};

uart2_sleep_alt: uart2_sleep_alt {

group1 {

psels = <NRF_PSEL(UART_RX, 1, 8)>,

<NRF_PSEL(UART_TX, 1, 9)>;

low-power-enable;

};

I first tried with a modified Central but original Peripheral and later tried both sides modified. Even with a unmodified Peripheral DK, no data was coming in or going out.

Thanks

RE: Central and Peripheral UART Samples on UART2 - nRF5340 Audio DK

dejans — Tue, 23 May 2023 14:47:54 GMT

Hi,

In the peripheral_uart app.overlay file, you would need to specify uart2 instead of uart0 and then to enable it.

/ {
	chosen {
		nordic,nus-uart = &uart2;
	};
};

&uart2 {
status = "okay"; 
....

};

Similar to peripheral_uart, uart2 would need to be enabled in central_uart too. On the central_uart side, uart0 is hard-coded in the main.c file and that would need to be changed as well.

static const struct device *uart = DEVICE_DT_GET(DT_NODELABEL(uart2));

Best regards,
Dejan