BMM150 doesn't work with M5AtomS3 and M5CoreS3

[carpenderspark]

I bought this one.

6-DoF IMU Pro Mini Unit (BMI270, BMM150, BMP280)
https://shop.m5stack.com/products/6-dof-imu-pro-mini-unit-bmi270-bmm150-bmp280
Six-axis Attitude Sensor (BMI270) I2C address:0x68(default)
Three-axis Geomagnetic Sensor (BMM150) I2C Address: 0x10
Atmospheric Pressure Sensor (BMP280) I2C Address: 0x76

I run I2C device probe program. The result is below.
I get same result on M5AtomS3 and M5CoreS3.
I use Visual Studio Code + PlatformIO.

I2C Scan SDA:2 SCL:1
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
.. .. .. .. .. .. .. ..
68 .. .. .. .. .. .. ..
.. .. .. .. .. .. 76 ..
.. .. .. .. .. .. .. ..

I also run on RaspberryPi. The result is below.

raspi@raspberrypi:~ $ i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- 76 --
raspi@raspberrypi:~ $

Is this normal status ?

device probe program

  auto cfg = M5.config();
  M5.begin(cfg);
  Wire.begin(M5.Ex_I2C.getSDA(), M5.Ex_I2C.getSCL(), 400000);
  Serial.printf("I2C Scan SDA:%d SCL:%d", M5.Ex_I2C.getSDA(), M5.Ex_I2C.getSCL());
  Serial.println();
  for (byte address = 0; address <= 127; address++) {
    Wire.beginTransmission(address);
    byte error = Wire.endTransmission();
    if (error == 0) {
      Serial.printf("%02X ", address);
    } else {
      Serial.print(".. ");
      if (address % 8 == 7) {
        Serial.println();
      }
    }
    delay(1);
  }

Thank you.

[felmue]

Hello @carpenderspark

yes, that is normal. The reason is that the BMM150 is not directly connected to the I2C bus (e.g. SDA, SCL) but is behind BMI270 (e.g. BMM_SDA, BMM SCL). See schematic here. That is the reason it doesn't show up in the I2C scan.

You can access it via BMI270 functions. See here.

Thanks
Felix

[carpenderspark]

@felmue Wow, thank you. I saw schematic, I understand. I try. I will report the result.
Thanks.

[carpenderspark]

Umm, it doesn't seem good combination <M5Unified> and <M5Unit-IMU-Pro-Mini>.

I got error message.

Dependency Graph
|-- M5Unified @ 0.1.16
|-- VL53L1X @ 1.3.1+sha.8f21d60
|-- M5Unit-ENV @ 1.0.1
|-- M5Unit-IMU-Pro-Mini @ 1.0.2+sha.002b74a
|-- WiFi @ 2.0.0
Building in release mode
Compiling .pio\build\m5stack-atoms3\src\main.cpp.o
In file included from .pio/libdeps/m5stack-atoms3/M5Unit-IMU-Pro-Mini/src/M5_IMU_PRO.h:7,
                 from src/main.cpp:8:
.pio/libdeps/m5stack-atoms3/M5Unit-IMU-Pro-Mini/src/BMI270.h:37:8: error: redefinition of 'struct BMI270::dev_info'
 struct dev_info {
        ^~~~~~~~
In file included from src/main.cpp:7:
.pio/libdeps/m5stack-atoms3/M5Unit-IMU-Pro-Mini/src/BMI270.h:37:8: note: previous definition of 'struct BMI270::dev_info'
 struct dev_info {
        ^~~~~~~~
In file included from .pio/libdeps/m5stack-atoms3/M5Unit-IMU-Pro-Mini/src/M5_IMU_PRO.h:7,
                 from src/main.cpp:8:
.pio/libdeps/m5stack-atoms3/M5Unit-IMU-Pro-Mini/src/BMI270.h:42:7: error: redefinition of 'class BMI270::BMI270'
 class BMI270 {
       ^~~~~~
In file included from src/main.cpp:7:
.pio/libdeps/m5stack-atoms3/M5Unit-IMU-Pro-Mini/src/BMI270.h:42:7: note: previous definition of 'class BMI270::BMI270'
 class BMI270 {
       ^~~~~~
*** [.pio\build\m5stack-atoms3\src\main.cpp.o] Error 1

M5Unified\src\utility\imu\BMI270_Class.hpp(11): class BMI270_Class : public IMU_Base
M5Unit-IMU-Pro-Mini\src\BMI270.h(42): class BMI270 {

I use this environment on PlatformIO.

[env:m5stack-atoms3]
platform = espressif32
board = m5stack-atoms3
framework = arduino
lib_deps = 
	m5stack/M5Unified@^0.1.16
	https://github.com/pololu/vl53l1x-arduino
	m5stack/M5Unit-ENV@^1.0.1
	https://github.com/m5stack/M5Unit-IMU-Pro-Mini

It is better to change M5Unified to another baseic library, isn't it?

[carpenderspark]

AtomS3 has MPU6886. umm
https://docs.m5stack.com/en/core/AtomS3
Built-in 3-axis gyroscope and 3-axis accelerometer (MPU6886)