BMA456 was shown as disabled

RE: BMA456 was shown as disabled

Charlie — Fri, 25 Oct 2024 10:34:20 GMT

Hi Gavin,

nRF52840 does have internal pull you can configure with devicetree.

See the following solution from my colleague:

RE: Do I need pull-up resistors when using I2C or does the driver set them up in software?

Best regards,

Charlie

RE: BMA456 was shown as disabled

freedom-168 — Thu, 24 Oct 2024 12:53:41 GMT

Hi Charlie,

Thanks for your quick response. Here is the DTS overlay file I am using.

&i2c0 {
status = "okay";
bma4xx: bma4xx@19 {
compatible = "bosch,bma4xx";
reg = <0x19>;
int1-gpios = <&gpio0 28 GPIO_ACTIVE_HIGH>;
};
};

Someone said that a pull up resistor should be added for SCL and SDA line; others said that some boards already provide the pull up resistor within it.

May I know whether nrf52840 has built-in pull up resistor for SCL/SDA ?

Is there any other thing I could investigate for this issue?

Regards/Gavin

RE: BMA456 was shown as disabled

Charlie — Thu, 24 Oct 2024 10:42:42 GMT

Hi Gavin,

Make usre your device is enable with status="okay".

You can refer to samples mentioned in https://github.com/zephyrproject-rtos/zephyr/discussions/68250#discussioncomment-8289679 for its usage.

Best regards,

Charlie