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  • Case ID: 308324
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Central and Peripheral UART Samples on UART2 - nRF5340 Audio DK

fweinrebe

Hello,

I am working with 2 x nRF5340 Audio DK.  I flashed the Central UART Sample on the 1st Kit and the Peripheral UART Sample on the second kit.  It works 100%. 

However the UART used in the sample is UART0 and it is a CDC-based UART accessible on the PC via 2 virtual COM ports via USB.  I need to set up the kits to use a Hardware UART since I will be connecting the kits to other devices via RS232. I have a UART/RS232 circuit to take care of that. 

According to the documentation, there is UART2 on the Arduino headers on Pin 1.08 (UART2_RXD)  and P1.09 (UART2_TXD).  

Based on the DTS files in the nRF5340 Audio DK there is no UART2 setup by default. I then created an overlay called nrf5340_audio_dk_nrf5340_cpuapp.overlay in the root folder of the project. Here are the contents:

&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 have tested another test project and I was able to communicate (RX and TX) with UART2 via my RS232/UART converter and a console on the PC. So UART2 is accessible and wired up correctly.

My question is:

How can I change these 2 projects (Central UART and Peripheral UART) to interact with UART2 and not with UART0?

Thanks

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  • 0

    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

  • 0 in reply to dejans

    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
Reply
  • 0 in reply to dejans

    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
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