RE: I2C scanner readouts fail on XIAO nrf52840 code developped in VSCode/nrfConnect/Zephyr

MarcusParis — Tue, 12 May 2026 10:23:46 GMT

@Nordic team. No need to spend time on this anymore. Solved by your AI recommendations I followed to the letter.The culprit was my overlay file and nothing else. Changed it as suggested, and it works nicely upfront. I2C address of connected device shows-up now (0x77).

/ {
    aliases {
        myi2c = &i2c0;
    };
};

&i2c0{
    compatible = "nordic,nrf-twim";
    status = "okay";
    clock-frequency = <I2C_BITRATE_STANDARD>;
    pinctrl-0 = <&i2c0_default>;
    pinctrl-1 = <&i2c0_sleep>;
    pinctrl-names = "default", "sleep";
};

&pinctrl {
    i2c0_default: i2c0_default {
        group1 {
            psels = <NRF_PSEL(TWIM_SCL, 0, 5)>,  
                    <NRF_PSEL(TWIM_SDA, 0, 4)>;
        };
    };
    i2c0_sleep: i2c0_sleep {
        group1 {
            psels = <NRF_PSEL(TWIM_SCL, 0, 5)>,
                    <NRF_PSEL(TWIM_SDA, 0, 4)>;
            low-power-enable;
        };
    };
};