XIAO nRF52840 Sense: unable to access onboard IMU

Products & Technology XIAO
1

I’m trying to read the onboard LSM6DS3TR-C IMU on a Seeed Studio XIAO nRF52840 Sense board using a small Arduino C test program. The setup is:

Board: Seeed Studio XIAO nRF52840 Sense
Core: Seeed nRF52 Boards, 1.1.13
Arduino IDE 1.8.19
Platform: macOS Sequoia

The program compiles and uploads successfully, but produces no output in Serial Monitor. It seems to be hanging when executing Wire1.endTransmission().

Test program:


#include <Wire.h>

void setup() {
  Serial.begin(9600);

  int powerpin = 15; // Enable the IMU power rail
  pinMode(powerpin, OUTPUT);
  digitalWrite(powerpin, HIGH);
  delay(10);
}

void loop() {
  Wire1.begin();
  Serial.println("Wire1 started");

  Wire1.beginTransmission(0x6A);
  Wire1.write(0x0F);
  Wire1.endTransmission(false);
  
  Wire1.requestFrom(0x6A, 1);
  Serial.print("WHO_AM_I = 0x");
  Serial.println(Wire1.read(), HEX);
  delay(1000);
}

I’ve tested the same program on a XIAO MG24, with the Silicon Labs core, with powerpin changed to 19, and this prints the expected values:

Wire1 started
WHO_AM_I = 0x6A

Any suggestions for further tests would be appreciated.

2

Hi there,

So t’s either the BSP or the LIB version, Look back there are some threads on it being documented, I think it was the wire or Wire1 that had the issue’s. it works with the seeed LIB though forsure. :grin: :+1:

HTH
GL :slight_smile: PJ :v:

I probably have the most demo’s of the IMU on here, btw. Check out the Motion, Fall and Park . demo’s for more.