LSM6DSV sensor hub with LIS2MDL through external trigger but don't work

[NWang.1]

Hello ST guys:

We want to use LSM6DSV(IMU) with an external magnetometer(LIS2MDL) through Sensor Hub mode to gather data and place acc, gyr and mag readings in the FIFO. We want to make INT2 into an input signal which triggers the sensor hub. And we configure following registers to make START _CONFIG = 1 according to following documentation:

sh_cfg_read.slv_add = (LIS2MDL_I2C_ADD & 0xFEU) >> 1; /* 7bit I2C address */
sh_cfg_read.slv_subadd = LIS2MDL_OUTX_L_REG;
sh_cfg_read.slv_len = 6;
lsm6dsv_sh_slv_cfg_read(&dev_ctx, 0, &sh_cfg_read);
lsm6dsv_fifo_sh_batch_slave_set(&dev_ctx, 0, PROPERTY_ENABLE);
lsm6dsv_sh_syncro_mode_set(&dev_ctx, LSM6DSV_SH_TRIG_INT2);  
lsm6dsv_sh_data_rate_set(&dev_ctx, LSM6DSV_SH_120Hz);	
lsm6dsv_sh_slave_connected_set(&dev_ctx, LSM6DSV_SLV_0_1);
lsm6dsv_sh_master_set(&dev_ctx, PROPERTY_ENABLE);

We also configure data ready signal on LIS2MDL:

lis2mdl_drdy_on_pin_set(&lis2mdl_ctx, PROPERTY_ENABLE);

But we don't get any external mag sensor samples from FIFO and we also use function lsm6dsv_all_int_source_get check but don't get anything. Is there any misunderstanding about the register configuration for INT2(Sensor Hub) or any good suggestions? Thank you very much.

BRs. 

[Federica Bossi]

Hi @NWang.1 ,

You can try to follow our official PID example, let me know if it helps!

[NWang.1]

Hi, Bossi,

We have followed your official PID example. In your example, the sensor hub trigger signal can be synchronized with the accelerometer/gyroscope data-ready signal (up to 480 Hz). In this configuration, the sensor hub ODR can be configured through the SHUB_ODR_[2:0] bits of the SLV0_CONFIG register. In this case, we can get mag sensor data.

But we want an external signal connected to the INT2 pin can be used as the sensor hub trigger. But after we have modified some code as above based on your official example, but we can't get mag sensor data. Thank you very much.

BRs.

[Christian N]

This post has been escalated to the ST Online Support Team for additional assistance. We'll contact you directly.