FIFO mode with watermark

[uilter]

Hi, I'm trying to use the iis3dwb as FIFO mode with a watermark.

I'm using a custom board. I double checked the hardware and guaranteed this board works well. I'm able to read/write the sensor using SPI interface and generate interrupt with wake-up int source.

In this mode the interrupt INT1 not works. This is my init code:

// Reset the sensor
response = iis3dwb_reset_set(&hAcc, PROPERTY_ENABLE);

do
{
    response = iis3dwb_reset_get(&hAcc, &reset);
    HAL_Delay(BOOT_TIME);
} while (reset);

iis3dwb_xl_data_rate_set(&hAcc, IIS3DWB_XL_ODR_26k7Hz);
iis3dwb_xl_full_scale_set(&hAcc, IIS3DWB_2g);
iis3dwb_fifo_mode_set(&hAcc, IIS3DWB_STREAM_MODE);
iis3dwb_fifo_watermark_set(&hAcc, 256);
iis3dwb_fifo_xl_batch_set(&hAcc, IIS3DWB_XL_BATCHED_AT_26k7Hz);
iis3dwb_block_data_update_set(&hAcc, 1);

int1_route.fifo_th = 1;
int1_route.fifo_ovr = 1;
int1_route.fifo_full = 1;
int1_route.fifo_bdr = 1;
iis3dwb_pin_int1_route_set(&hAcc, &int1_route);

Please, could you guide me to find where is my mistake? If possible, can anyone add a sample code for fifo mode with watermark? It will be nice!

Many thanks for this library.

[uilter]

Hi, I figure out how to set it.

                iis3dwb_pin_int1_route_t int1_route = {0x00};

        iis3dwb_xl_full_scale_set(&hAcc, IIS3DWB_2g);
        iis3dwb_block_data_update_set(&hAcc, 1);
        iis3dwb_fifo_watermark_set(&hAcc, 0x1FF);
        iis3dwb_fifo_stop_on_wtm_set(&hAcc, 1);
        iis3dwb_fifo_mode_set(&hAcc, IIS3DWB_STREAM_TO_FIFO_MODE);
        iis3dwb_fifo_timestamp_decimation_set(&hAcc, IIS3DWB_NO_DECIMATION);
        iis3dwb_fifo_xl_batch_set(&hAcc, IIS3DWB_XL_BATCHED_AT_26k7Hz);
        iis3dwb_xl_data_rate_set(&hAcc, IIS3DWB_XL_ODR_26k7Hz);

        int1_route.fifo_th = 1;
        int1_route.fifo_ovr = 1;
        int1_route.fifo_full = 1;
        int1_route.fifo_bdr = 1;
        iis3dwb_pin_int1_route_set(&hAcc, &int1_route);

When the interrupt occurs, just need read the fifo like it.

                iis3dwb_fifo_status_get(&hAcc, &statusFifo2);

        if(statusFifo2.fifo_wtm_ia)
        {
            iis3dwb_fifo_data_level_get(&hAcc, &num);

            waterLevel = num / 3;
            fifoLevel = waterLevel;

            while(waterLevel-- > 0 || i < fifoLevel)
            {
                iis3dwb_fifo_out_raw_get(&hAcc, data_raw_acceleration.u8bit);

                acceleration_mg[i++] = iis3dwb_from_fs2g_to_mg(data_raw_acceleration.i16bit[0]);
                acceleration_mg[i++] = iis3dwb_from_fs2g_to_mg(data_raw_acceleration.i16bit[1]);
                acceleration_mg[i++] = iis3dwb_from_fs2g_to_mg(data_raw_acceleration.i16bit[2]);
            }

            /* Reset FIFO */
            iis3dwb_fifo_mode_set(&hAcc, IIS3DWB_BYPASS_MODE);
            iis3dwb_fifo_mode_set(&hAcc, IIS3DWB_STREAM_TO_FIFO_MODE);
        }

[avisconti]

@uilter

Good you were able to solve it by yourself. From our side we need for sure to add more examples, for example using FIFO as you suggested. Thanks!