AN4650 datasheet(64/102 Pages) STMICROELECTRONICS

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Mode 2 - sensor hub mode

AN4650

64/102

DocID027415 Rev 1

6.3

Sensor hub mode example

The configuration of the external sensors should be performed using the pass-through

feature: this feature can be enabled by setting the PASS_THROUGH_MODE bit of the

MASTER_CONFIG register to 1 and implements a direct access to the external sensor

registers, allowing quick configuration.

The code provided below gives a basic routine to configure the LSM6DS3 in sensor hub

mode. Furthermore, this sequence configures the LIS3MDL external magnetometer sensor

(refer to the datasheet for additional details) in continuous-conversion mode and reads the

magnetometer output registers, saving their values in the SENSORHUB1_REG to

SENSORHUB6_REG registers. The pass-through feature is not used in this example.

Write 80h into FUNC_CFG_ADDRESS

// Enable access to embedded functions registers

Write 38h into SLV0_ADD

// LIS3MDL slave address = 0011100b (if SDO=0)

// Enable write operation (rw_0=0)

Write 22h into SLV0_SUBADD

// 22h is the LIS3MDL register to be written

Write 00h into

DATAWRITE_SRC_MODE_SUB_SLV0

// 00h is the value to be written in register 22h of

// LIS3MDL to configure it in continuous

// conversion mode

Write 00h into FUNC_CFG_ADDRESS

// Disable access to embedded functions registers

Write 3Ch into CTRL10_C

// Enable embedded functions

Write 09h into MASTER_CONFIG

// Enable internal pull-up on SDx/SCx lines

// Sensor hub trigger signal is XL Data Ready

// Enable auxiliary I2C master

Write 80h into CTRL1_XL

// Turn-on the accelerometer (for trigger signal)

Write 38h into CTRL10_C

// Disable embedded functions

10 Write 00h into MASTER_CONFIG

// Disable auxiliary I2C master

11 Write 00h into CTRL1_XL

// Turn-off the accelerometer

12 Write 80h into FUNC_CFG_ADDRESS

// Enable access to embedded functions registers

13 Write 39h into SLV0_ADD

// LIS3MDL slave address = 0011100b (if SDO=0)

// Enable read operation (rw_0=1)

14 Write 28h into SLV0_SUBADD

// 28h is the first LIS3MDL output register to be

// read

15 Write 06h into SLAVE0_CONFIG

// No decimation

// 1 external sensor connected

// Number of registers to read = 6

16 Write 00h into FUNC_CFG_ADDRESS

// Disable access to embedded functions registers

17 Write 3Ch into CTRL10_C

// Enable embedded functions

18 Write 09h into MASTER_CONFIG

// Enable internal pull-up on SDx/SCx lines

// Sensor hub trigger signal is XL Data Ready

// Enable auxiliary I2C master

19 Write 80h into CTRL1_XL

// Turn on the accelerometer (for trigger signal)

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