Device bmi270@68 is not ready when using nrf5340 and the BMI270 sample

[lcj]

I am trying to get the BMI270 working with a nrf5340 DK. I have read Unable to Connect nRF5340DK with BMI270 Over I2C - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com) and Falied to Connect nRF5340DK with BMI270 Over I2C - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com), but neither had an answer. I understand the comment that the BMI270 driver "does a lot of stuff", but that did not seem like a reasonable answer to me considering it seems to work with the nrf52833. I added the:

zephyr,concat-buf-size = <128>;

Which did not solve my issue which was that I ran the sample and got this error message:

Device bmi270@68 is not ready

[Håkon Alseth]

Hi,

 

Do you have external pull resistors?

If not, try to enable internal pull-ups in DT:

&pinctrl {
	i2c1_my_default: i2c1_my_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
				<NRF_PSEL(TWIM_SCL, 1, 3)>;
            bias-pull-up;
		};
	};

	i2c1_my_sleep: i2c1_my_sleep {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
				<NRF_PSEL(TWIM_SCL, 1, 3)>;
			low-power-enable;
		};
	};
};

&i2c1 {
	compatible = "nordic,nrf-twim";
	status = "okay";
	pinctrl-0 = <&i2c1_my_default>;
	pinctrl-1 = <&i2c1_my_sleep>;
	pinctrl-names = "default", "sleep";
	zephyr,concat-buf-size = <128>;
    bmi270@68 {
            compatible = "bosch,bmi270";
            reg = <0x68>;
    };	
};

 

Kind regards,

Håkon

[lcj]

I have a board to connect w/the nRF5340 DK with a separate I2C SCL/SDA (currently P0.24 and P0.23 respectively). For the BMI270 INT1 is P0.06 and INT2 is P0.09.

I replaced the overlay with what you provided but got the same response.

I did have to add one additional item because there is a SAO address bit for the BMI and I need to make this MCU GPIO Output LOW and it will be BMI270 default i2c address 0b1101000 (0x68).

&gpio0 {
    status = "okay";
    p0_19_hog: p0_19_hog {
        gpio-hog;
        gpios = <19 GPIO_ACTIVE_HIGH>;
        output-low;
    };
};

[Joao Colombari]

Nevermind, now it works fine.

I was just using:

zephyr,deferred-init;

and not initializing in main. 

All the best!

[Luis Santos]

Hello Joao, 

What is mean?

Cold you please share your code and .dts?

[VinayKotadamakki]

Hi Joao,

I am facing the same issue will you please share your dts and code.

Thanks alot!!!

[VinayKotadamakki]

Hi Icj,

Will you please share your code and dts. I am facing the same issue with BMI270 device is not ready.

Thanks alot!!

[Luis Santos]

Hi, 

This works for me:

&i2c1 {

status = "okay";

compatible = "nordic,nrf-twim";

clock-frequency = <I2C_BITRATE_FAST>;

pinctrl-0 = <&i2c1_default>;

pinctrl-1 = <&i2c1_sleep>;

pinctrl-names = "default", "sleep";

/* One-shot, contiguous transfers up to 257 bytes */

zephyr,concat-buf-size = <257>;

bmi270: bmi270@68 {

status = "okay";

compatible = "i2c-device";

reg = <0x68>;

label = "bmi270";

};

};

&pinctrl {

i2c1_default: i2c1_default {

group1 {

psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,

<NRF_PSEL(TWIM_SCL, 1, 3)>;

bias-pull-up;

nordic,drive-mode = <NRF_DRIVE_E0E1>;

};

};

i2c1_sleep: i2c1_sleep {

group1 {

psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,

<NRF_PSEL(TWIM_SCL, 1, 3)>;

low-power-enable;

};

};

};

I had a lot of difficulty with the welding. I needed to increase the pad to make the process easier.