RE: Zephyr BLE stack and SPIM signals interference

PabloL — Thu, 07 Dec 2023 13:22:54 GMT

Hello Kenneth,

You're right.
These pins are used for the UART1 of network core to communicate with the interface MCU in the nRF5340-DK.

After commenting these lines in the file "nrf5340_cpuapp_common.dtsi", everything started to work.

    gpio_fwd: nrf-gpio-forwarder {
        compatible = "nordic,nrf-gpio-forwarder";
        status = "okay";
        uart {
            gpios = <&gpio1 1 0>, <&gpio1 0 0>, <&gpio0 11 0>, <&gpio0 10 0>;
        };
    };

Thank you!

Pablo

RE: Zephyr BLE stack and SPIM signals interference

Kenneth — Thu, 07 Dec 2023 08:01:19 GMT

Hello,

By default I think the pins you refer to are forwarded from the appcore to the netcore, ref:
https://github.com/nrfconnect/sdk-zephyr/blob/v3.4.99-ncs1/boards/arm/nrf5340dk_nrf5340/nrf5340_cpuapp_common.dtsi#L113

So appcore does not have control over these pins if they are forwarded.

Kenneth