Hello,
I'm trying to connect a BMI270 sensor over I2C using Port2 on the nRF54L15, with the nRF54L15 DK, and I'm working with the nRF Connect SDK v2.9.0, based on a Zephyr sample.
Here's what I've observed:
-
I'm using P2.06 as SCL and P2.07 as SDA, without external pull-up resistors. Instead, I'm relying on the
bias-pull-upconfiguration in thepinctrl. -
When the sensor is NOT connected, I can see waveforms on the SCL line as expected (confirmed with an oscilloscope).
-
When I connect the sensor, the SCL line stays high, and I don't see any waveforms — it seems the line gets stuck.
-
If I try changing the SDA pin to P2.08, P2.09, or P2.10, I don't get any activity on the SCL line at all, regardless of whether the sensor is connected or not.
-
I'm only trying to use these P2.x pins for the I2C connection, and they are available on my board.
As a comparison, if I use Port1 (with P1.07 as SCL and P1.06 as SDA), everything works perfectly — the sensor communicates as expected.
My question is:
Are the pins P2.06 to P2.10 actually usable for I2C communication on the nRF54L15 DK?
I've tried several configurations but nothing seems to work on Port2.
Any help or clarification would be greatly appreciated.
Thanks in advance!
My .overlay:
/*
* Copyright (c) 2021 Bosch Sensortec GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
&i2c21 {
status = "okay";
compatible = "nordic,nrf-twim";
clock-frequency = <I2C_BITRATE_STANDARD>;
pinctrl-0 = <&i2c21_default>;
pinctrl-1 = <&i2c21_sleep>;
pinctrl-names = "default", "sleep";
zephyr,concat-buf-size = <257>;
bmi270@68 {
compatible = "bosch,bmi270";
reg = <0x68>;
};
};
&pinctrl {
i2c21_default: i2c21_default {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 2, 7)>,
// psels = <NRF_PSEL(TWIM_SDA, 1, 6)>,
<NRF_PSEL(TWIM_SCL, 2, 6)>;
// <NRF_PSEL(TWIM_SCL, 1, 7)>;
nordic,drive-mode = <NRF_DRIVE_H0H1>;
bias-pull-up;
};
};
i2c21_sleep: i2c21_sleep {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 2, 7)>,
// psels = <NRF_PSEL(TWIM_SDA, 1, 6)>,
<NRF_PSEL(TWIM_SCL, 2, 6)>;
// <NRF_PSEL(TWIM_SCL, 1, 7)>;
low-power-enable;
};
};
};
