ISM330DLC, no accelerometer or gyroscope data in FIFO

[LackSumInfo]

Greetings,

I have been trying to read the sensors from the ISM330DLC using its FIFO. However, when reading the number of samples (FIFO_STATUS1/2), it remains 0 with just dataset 1 and 2 enabled. When enabling dataset 4 with either, or and temperature and timestamp, the FIFO fills as expected. Note that im able to poll the sensor values with expected results.

I have included all my register settings below, using the standard c-library: https://github.com/STMicroelectronics/STMems_Standard_C_drivers/tree/master/ism330dlc_STdC

 

  /* Enable Block Data Update */

  ism330dlc_block_data_update_set(&dev_ctx, PROPERTY_ENABLE);

 

  /* Set full scale */

   ism330dlc_xl_full_scale_set(&dev_ctx, ISM330DLC_2g);

    ism330dlc_gy_full_scale_set(&dev_ctx, ISM330DLC_500dps);

 

/* Set wtm */

    ism330dlc_fifo_watermark_set(&dev_ctx, 100);

/* accelerometer filtering chain */

    ism330dlc_xl_lp1_bandwidth_set(&dev_ctx,ISM330DLC_XL_LP1_ODR_DIV_2);

 

    ism330dlc_xl_filter_analog_set(&dev_ctx,

    ISM330DLC_XL_ANA_BW_1k5Hz);

 

/* Gyroscope filtering chain */

    ism330dlc_gy_band_pass_set(&dev_ctx, ISM330DLC_HP_260mHz_LP1_STRONG);

 

  /* FIFO settings */

  ism330dlc_fifo_data_rate_set(&dev_ctx, ISM330DLC_FIFO_6k66Hz);

 

 

     ism330dlc_fifo_gy_batch_set(&dev_ctx, ISM330DLC_FIFO_GY_NO_DEC);

     ism330dlc_fifo_xl_batch_set(&dev_ctx, ISM330DLC_FIFO_XL_NO_DEC);

 

    ism330dlc_xl_data_rate_set(&dev_ctx, ISM330DLC_XL_ODR_6k66Hz);

   ism330dlc_gy_data_rate_set(&dev_ctx, ISM330DLC_GY_ODR_6k66Hz);

 

     ism330dlc_fifo_mode_set(&dev_ctx, ISM330DLC_STREAM_MODE);

 

[Federica Bossi]

Hi @LackSumInfo ,

Try something like this:

/* Set full scale */
ism330dlc_xl_full_scale_set(&dev_ctx, ISM330DLC_2g);
ism330dlc_gy_full_scale_set(&dev_ctx, ISM330DLC_500dps);
/* Enable Block Data Update */
ism330dlc_block_data_update_set(&dev_ctx, PROPERTY_ENABLE);

pattern_len = 10;
ism330dlc_fifo_watermark_set(&dev_ctx, 10 * pattern_len);
/* Set FIFO mode to Stream mode */
ism330dlc_fifo_mode_set(&dev_ctx, ISM330DLC_STREAM_MODE);

/* Enable FIFO watermark interrupt generation on INT1 pin */
ism330dlc_pin_int1_route_get(&dev_ctx, &int_1_reg);
int_1_reg.int1_fth = PROPERTY_ENABLE;
ism330dlc_pin_int1_route_set(&dev_ctx, int_1_reg);

/* Set FIFO sensor decimator */
ism330dlc_fifo_xl_batch_set(&dev_ctx, ISM330DLC_FIFO_XL_NO_DEC);
ism330dlc_fifo_gy_batch_set(&dev_ctx, ISM330DLC_FIFO_GY_NO_DEC);
/* Set ODR FIFO */
ism330dlc_fifo_data_rate_set(&dev_ctx, ISM330DLC_FIFO_6k66Hz);

/* Set XL and Gyro Output Data Rate:*/
ism330dlc_xl_data_rate_set(&dev_ctx, ISM330DLC_XL_ODR_6k66Hz);
ism330dlc_gy_data_rate_set(&dev_ctx, ISM330DLC_GY_ODR_6k66Hz);

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[LackSumInfo]

Thank you for your sugestion, unfortunatly the problem remains the same.

I use these methods to check the status of the number of samples and wtm-flag:

ism330dlc_fifo_wtm_flag_get(&dev_ctx, &FIFO_wtm_flag);
ism330dlc_fifo_data_level_get(&dev_ctx, &FIFO_nValues);

where the storage regusters are declared as:

static uint16_t FIFO_nValues = 0;
static uint8_t FIFO_wtm_flag = 0;

 

[niccolò]

Hi @LackSumInfo ,

could you show us a dump of the FIFO_CTRL and FIFO_STATUS registers?
also, is it a problem for you the fact that you have to turn on also the fourth dataset?

Niccolò

 

[LackSumInfo]

Enabled the 4th dataset, its not an issue. However i dont see anything in the documentation mentioning it as an requirement:

ism330dlc_fifo_dataset_4_batch_set(&dev_ctx, ISM330DLC_FIFO_DS4_NO_DEC);

The following is the dump of status and config:

FIFO_CTRL1= 11001100 (LE)

FIFO_CTRL2= 00000000 (LE)

FIFO_CTRL3= 00001001 (LE)

FIFO_CTRL4= 00001000 (LE)

FIFO_STATUS1= 00000000 (LE)

FIFO_STATUS2= 11101010 (LE)

FIFO_STATUS3= 00000000 (LE)

FIFO_STATUS4= 00000000 (LE)

When the 4th dataset is enabled, the FIFO fills up with data that is almost entirely 0. I read the FIFO the following way:

memset(data_raw_fifo, 0x00, 3 * sizeof(int16_t));
ism330dlc_fifo_raw_data_get(&dev_ctx, (uint8_t*) data_raw_fifo,
FIFO_nValues);