using imu sensor with nrf52840 based Xiao BLE Sense

[rania amara]

hi,i wanna read the imu sensor  lsm6ds3 on board of nrf52840 based Xiao BLE Sense

so i used the code in samples /sensor/lsm6dsl 

first i didn't know if i do have to create an overlay file since the  imu is build in and eventually i created this overlay file" xioa-ble-nrf52840-sense.overlay":

/*

 * Copyright (c) 2022-2023 Marcin Niestroj

 *

 * SPDX-License-Identifier: Apache-2.0

 */

 

 / {

     model = "Seeed XIAO BLE Sense";

     compatible = "seeed,xiao-ble", "seeed,xiao-ble-sense";

 

     lsm6ds3tr-c-en {

         compatible = "regulator-fixed-sync", "regulator-fixed";

         enable-gpios = <&gpio1 8 (NRF_GPIO_DRIVE_S0H1 | GPIO_ACTIVE_HIGH)>;

         regulator-name = "LSM6DS3TR_C_EN";

         regulator-boot-on;

         startup-delay-us = <3000>;

     };

 };

 

 &i2c0 {

     compatible = "nordic,nrf-twim";

     /* Cannot be used together with spi0. */

     status = "okay";

     pinctrl-0 = <&i2c0_default>;

     pinctrl-1 = <&i2c0_sleep>;

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

     clock-frequency = <I2C_BITRATE_FAST>;

 

     lsm6ds3tr_c: lsm6ds3tr-c@6a {

         compatible = "st,lsm6dsl";

         reg = <0x6a>;

         irq-gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>;

         status = "okay";

     };

 };

which is paracticlly the same in  xioa-ble-nrf52840-sense.dts 

plus i didn't know if i need to make changes in the originall code of lsm6dsl

so when i build i got error involve this line 

  const struct device *const lsm6dsl_dev = DEVICE_DT_GET_ONE(st_lsm6dsl); and it seems they are using xiao-ble.dts and not xiao-ble_nrf52840_sense.dst  so can you help me

[rania amara]

i just forgot to say ,i got this imu lsm6ds3  schematic   and i dont know how i'm suppose to use it

[helsing]

Hi rania,

Thank you for the request. Just letting you know I have started looking into this. I will get back to you later this week.

[PjGlasso]

Hi there,

SO the Schematic shows you some stuff , Like the power to the IMU can be controlled by Port P1.08 also,

in arduino it is set like this 

LSM6DS3 IMU(I2C_MODE, 0x6A);  //I2C device address 0x6A  // IMU
#define int2Pin PIN_LSM6DS3TR_C_INT1

The I2C address for the IMU is 0x6A configuration and registers to read the data from as well as the INT1 is the only Interrupt pin wired to it and the config registers are set to route everything through INT1 if that makes sense.

my .02 

HTH

GL :-) PJ 

[Sigurd Hellesvik]

Hi,

I will continue to help in this ticket.

I guess that you do not need to change the /sensor/lsm6dsl sample to build the project.

Which board target are you building for?

The sample does not build for "xiao_ble", but will build for "xiao_ble/nrf52840/sense". Ref xiao_ble docs.

[Akshay Mehta]

Hello rania amara ,

Ideally you need to create an overlay file if (a) the board's standard definition doesnot match your usecase or (b) it is a customer board. 

We have build easy to use library for imu sensor with nrf52840 based Xiao BLE Sense. You can download and use it.

Feel free to contact me if you need help.

Best,

Akshay