Issues with repeated start on I2C

RE: Issues with repeated start on I2C

Kazi Afroza Sultana — Tue, 20 Jan 2026 09:37:38 GMT

Hello,

I am happy to hear this.

Thanks,

Kazi

RE: Issues with repeated start on I2C

yango — Mon, 19 Jan 2026 15:25:03 GMT

Hi Kazi:

Looks like your proposed changes to the overlay file work. I am now able to communicate the the sensor over I2C.

Thanks!

RE: Issues with repeated start on I2C

Kazi Afroza Sultana — Mon, 19 Jan 2026 09:22:28 GMT

Hello,

I think there is bugs in the "nordic,nrf-twi" driver in ncs v3.2.1.

You can use twim instead of twi for compatible device (when you use ncs V3.2.1) and if you are using internal pull-up, try to add this in the overlay.

&i2c0 {
    status = "okay";
    compatible = "nordic,nrf-twim";
    pinctrl-0 = <&i2c0_default>;
	pinctrl-1 = <&i2c0_sleep>;
    pinctrl-names = "default", "sleep";
    lis3dh: lis3dh@18{
        compatible = "i2c-device";
        status = "okay";
        reg = < 0x18 >;
    };
};

&pinctrl {
	/omit-if-no-ref/ i2c0_default: i2c0_default {
		group1  {
			psels = <NRF_PSEL(TWIM_SCL, 1, 14)>,
					<NRF_PSEL(TWIM_SDA, 1, 15)>;
					 bias-pull-up; 
		};
	};

	/omit-if-no-ref/ i2c0_sleep: i2c0_sleep {
		group1  {
			psels = <NRF_PSEL(TWIM_SCL, 1, 14)>,
					<NRF_PSEL(TWIM_SDA, 1, 15)>;
			low-power-enable;
		};
	};
};

I have talked to team about the bug; I will get back to you lately when there is an update. In the meantime, you can Try this and let us know if it works.

Thanks.

Kazi

RE: Issues with repeated start on I2C

yango — Sun, 18 Jan 2026 16:23:34 GMT

Thanks! Downgrading the SDK to v3.1.1 fixes the issue. Seems like there's a regression in the latest SDK.

RE: Issues with repeated start on I2C

Turbo J — Sun, 18 Jan 2026 07:06:29 GMT

Try downgrading to NCS 3.1.1 version, I've seen this bug reported here already for the 3.2.1 version.