nRF54LM20 I2C Communication issue

[VinayKotadamakki]

Hi Team,

I am trying BMI270 Sample using nRF54LM20 DK. But the problem here is it getting exited after checking the device is ready section. 

/* ---------------- PIN CONTROL ---------------- */
&pinctrl {

    i2c20_default_alt: i2c20_default_alt {
        group1 {
            psels = <
                NRF_PSEL(TWIM_SDA, 1, 17)
                NRF_PSEL(TWIM_SCL, 1, 16)
            >;
        };
    };

    i2c20_sleep_alt: i2c20_sleep_alt {
        group1 {
            psels = <
                NRF_PSEL(TWIM_SDA, 1, 17)
                NRF_PSEL(TWIM_SCL, 1, 16)
            >;
            low-power-enable;
        };
    };

};

/* ---------------- USB ---------------- */
&zephyr_udc0 {
    cdc_acm_uart0: cdc_acm_uart0 {
        compatible = "zephyr,cdc-acm-uart";
    };

    cdc_acm_uart1: cdc_acm_uart1 {
        compatible = "zephyr,cdc-acm-uart";
    };
};

/* ---------------- I2C + BMI270 ---------------- */

&i2c20 {
    status = "okay";

    pinctrl-0 = <&i2c20_default_alt>;
    pinctrl-1 = <&i2c20_sleep_alt>;
    pinctrl-names = "default", "sleep";

    clock-frequency = <I2C_BITRATE_STANDARD>;

    bmi270: bmi270@69 {
        compatible = "bosch,bmi270";
        reg = <0x69>;
        status = "okay";
    };
};


&uart20 {
    status = "disabled";
};


/* ---------------- BUZZER ---------------- */
 / {
    aliases {
        bmi270 = &bmi270;

    };

};

Added my overlay file for your reference.

Thanks and regards,

Vinay

[VinayKotadamakki]

Is there any default pins we have to use for I2C Communication? 

If yes, please let me know which pin we have to use on nRF54LM20 DK.

Thanks, and regards,

Vinay

[Vidar Berg]

Hello,

If you look at the silkscreen on the backside of the board, you can see that P1.17 and P1.16 are both connected to the on board debugger (VCOMs). To free these pins, you can use the board configurator app and disable VCOM1: https://docs.nordicsemi.com/bundle/ug_nrf54lm20_dk/page/UG/nRF54LM20_DK/hw_desription/board_control.html 

[VinayKotadamakki]

Hi Vidar,

Thank you for the reply.

We need to configure 2 I2C master bus in nRF54LM20. Is it possible?

thanks and regards,

Vinay