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    BMG250 Power Mode not working

    S4MFTW
    Occasional Visitor

    BMG250 Power Mode not working

    I have hooked up the BMG250 shuttle board to my Raspberry Pi 3 (I2C) and it is currently in suspend mode. I am able to read/write to registers such as GYR_CONF (0x42) and GYR_RANGE (0x43).

    So in order to change the PMU status from suspend mode to normal mode I execute the following line:

    bus.write_byte_data(0x68, 0x7E, 0x15)

    To check the PMU status I wrote:

    time.sleep(1)
    bus.read_i2c_block_data(0x68, 0x03, 1)

    And I keep getting PMU Status as 0. Instead of the integer 4 which would be representative of normal mode. Does anybody know how to fix this?

    Here is my full code:

    import smbus
    import time

    # Get I2C bus
    bus = smbus.SMBus(1)

    # I2C address of the device
    BMG250_DEFAULT_ADDRESS = 0x68

    # BMG250 Register Map
    BMG250_REG_CHIPID = 0x00 # Chip ID Register
    BMG250_REG_ERR = 0x02 # Error Register
    BMG250_REG_PMU = 0x03 # PMU Status
    BMG250_REG_STATUS = 0x1B # Status Register
    BMG250_REG_CMD = 0x7E # Command Register
    BMG250_REG_NVCONF = 0x70 # Watchdog Timer
    BMG250_REG_NVM = 0x6A # NVM Programming
    BMG250_REG_IF = 0x6B # Interface Configuration
    BMG250_REG_ST = 0x6D # Self-Test Register
    BMG250_REG_X_LSB = 0x12 # X-axis Data LSB
    BMG250_REG_X_MSB = 0x13 # X-axis Data MSB
    BMG250_REG_Y_LSB = 0x14 # Y-axis Data LSB
    BMG250_REG_Y_MSB = 0x15 # Y-axis Data MSB
    BMG250_REG_Z_LSB = 0x16 # Z-axis Data LSB
    BMG250_REG_Z_MSB = 0x17 # Z-axis Data MSB
    BMG250_REG_TEMP = 0x20 # Temperature Register
    BMG250_REG_RANGE = 0x43 # Range Register
    BMG250_REG_DOR = 0x42 # Data Output Rate Register

    # BMG250 Range Register Configuration
    BMG250_RANGE_2000 = 0x00 # Full Scale = +/-2000dps
    BMG250_RANGE_1000 = 0x01 # Full Scale = +/-1000dps
    BMG250_RANGE_500 = 0x02 # Full Scale = +/-500dps
    BMG250_RANGE_250 = 0x03 # Full Scale = +/-250dps
    BMG250_RANGE_125 = 0x04 # Full Scale = +/-125dps

    # BMG250 Data Output Rate Register Configuration
    BMG250_1600_HZ = 0x2C # 1600 Hz Configuration

    # BMG250 PMU Configuration
    BMG250_PMUT = 0x11 # Gyroscope Temp Normal Mode
    BMG250_PMUN = 0x15 # Gyroscope Normal Mode
    BMG250_PMUF = 0x17 # Gyroscope Fast Mode
    BMG250_PMUSR = 0xB6 # Gyroscope Soft Reset

    # BMG250 NV Configuration
    BMG250_NVCONF = 0x00 # I2C Watchdog Timer Configuration

    time.sleep(1)

    """Select the Data Output Rate Register Configuration from the given provided value"""
    DOR1600 = (BMG250_1600_HZ)
    bus.write_byte_data(BMG250_DEFAULT_ADDRESS, BMG250_REG_DOR, DOR1600)

    time.sleep(1)

    value3 = bus.read_i2c_block_data(BMG250_DEFAULT_ADDRESS, BMG250_REG_DOR, 1)
    print("BMG250 Data Output Rate value: %s" %value3)

    time.sleep(1)

    """Select the PMU Status from the given provided value"""
    PMU_MODE = (BMG250_PMUN)
    bus.write_byte_data(BMG250_DEFAULT_ADDRESS, BMG250_REG_CMD, PMU_MODE)

    time.sleep(1)

    value1 = bus.read_i2c_block_data(BMG250_DEFAULT_ADDRESS, BMG250_REG_PMU, 1)
    time.sleep(0.1)
    print("BMG250 PMU value: %s" %value1)

    time.sleep(1)

    """Check the Error Register"""
    value6 = bus.read_i2c_block_data(BMG250_DEFAULT_ADDRESS, BMG250_REG_ERR, 1)
    print("BMG250 ERR value: %s" %value6)

    time.sleep(1)

    """Select the Range Register Configuration from the given provided value"""
    RANGE_CONFIG = (BMG250_RANGE_2000)
    bus.write_byte_data(BMG250_DEFAULT_ADDRESS, BMG250_REG_RANGE, RANGE_CONFIG)

    time.sleep(1)

    value4 = bus.read_i2c_block_data(BMG250_DEFAULT_ADDRESS, BMG250_REG_RANGE, 1)
    print("BMG250 RANGE value: %s" %value4)

    time.sleep(1)

    """Read from the Temperature Register"""
    value5 = bus.read_i2c_block_data(BMG250_DEFAULT_ADDRESS, BMG250_REG_TEMP, 2)
    time.sleep(0.1)
    print("BMG250 TEMP value: %s" %value5)

    time.sleep(1)

    class BMG250():
    def __init__(self):
    self.read_gyro()

    def read_gyro(self):
    """Read data back from BMG250_REG_X_LSB(0x12), 6 bytes
    X-Axis LSB, X-Axis MSB, Y-Axis LSB, Y-Axis MSB, Z-Axis LSB, Z-Axis MSB"""
    data = bus.read_i2c_block_data(BMG250_DEFAULT_ADDRESS, BMG250_REG_X_LSB, 6)

    # Convert the data
    xGyro = data[1] * 256 + data[0]
    if xGyro > 32767 :
    xGyro -= 65536

    yGyro = data[3] * 256 + data[2]
    if yGyro > 32767 :
    yGyro -= 65536

    zGyro = data[5] * 256 + data[4]
    if zGyro > 32767 :
    zGyro -= 65536

    return {'x' : xGyro, 'y' : yGyro, 'z' : zGyro}

    BMG250 = BMG250()

    i = 1
    while i < 2:
    gyro = BMG250.read_gyro()
    time.sleep(0.1)
    print("X-Axis of Rotation : %f" %(gyro['x']))
    print("Y-Axis of Rotation : %f" %(gyro['y']))
    print("Z-Axis of Rotation : %f" %(gyro['z']))
    print(" ************************************ ")
    time.sleep(1)
    i += 1

     

    Tags (3)
    1 REPLY 1
    Yanchao
    Community Moderator

    Re: BMG250 Power Mode not working

    Hi,

    I think maybe some mistake during BMG250 initial.

    We have formal BMG250 API and example, please refer BMG250-API example to build up your code.

    Best regards.

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