BMA456 any-/no-motion interrupt does not occur

[rearmimator]

Hi there,

I have got a custom made board equiped with BMA456 sensor.

Following guide found on github I could bring the sensor up over I2C interface: https://github.com/BoschSensortec/BMA456-Sensor-API;

My issue is that having basic communication working, no (any-/no-motions) interrupts are generated by sensor IC.

Both interrupt status register 0 & 1 stay zero all ther time regardless how threshold and duration are set up.

I wonder what could be the reason for missing interrupts.

Here is the code snippet used to initialise and test the interrupt generation.

I attached also the traces obtained during one of the test runs.

Is anything that I am doing wrong there?

uint16_t BMA456::sensor_bma456_init(void)
{
    uint16_t rslt = BMA4_OK;

    this->m_AccelDev.dev_addr       = BMA4_I2C_ADDR_SECONDARY;
    this->m_AccelDev.interface      = BMA4_I2C_INTERFACE;
    this->m_AccelDev.bus_read       = &BMA456::bma4_read_wrapper;
    this->m_AccelDev.bus_write      = &BMA456::bma4_write_wrapper;
    this->m_AccelDev.delay          = &BMA456::bma4_udelay;
    this->m_AccelDev.read_write_len = 8;
    this->m_AccelDev.resolution     = 12;
    this->m_AccelDev.feature_len    = BMA456_FEATURE_SIZE;

    /* a. Reading the chip id. */
    rslt |= bma456_init(&this->m_AccelDev);

    /* b. Performing initialisation sequence.
       c. Checking the correct status of the initialisation sequence.
     */
    rslt |= bma456_write_config_file(&this->m_AccelDev);

#if 0
  {
    uint8_t cmd = 0xB6;
    bma4_set_command_register(&cmd, &this->m_AccelDev); // reset device
  }
#endif

    osDelay(1); // wait for POR finish

    rslt |= bma4_set_accel_enable(BMA4_ENABLE, &this->m_AccelDev);

    rslt |= bma456_write_config_file(&this->m_AccelDev);

    {
        uint16_t int_status = 0u;
        uint16_t rc = BMA4_OK;

        rc |= bma4_read_int_status(&int_status, &this->m_AccelDev);

        /* Declare a no/any-motion interrupt configuration structure */
        bma456_any_no_mot_config any_mot_confg;
        bma456_any_no_mot_config no_mot_confg;

        rc |= bma456_get_any_mot_config(&any_mot_confg, &this->m_AccelDev);
        if (!rc) {
            printf("\n=== Get any-motion configuration successful === \n");
            printf("axis_en = %x\n", any_mot_confg.axes_en);
            printf("duration = %x\n", any_mot_confg.duration);
            printf("threshold = %x\n", any_mot_confg.threshold);
        }

        rc |= bma456_get_no_mot_config(&no_mot_confg, &this->m_AccelDev);
        if (!rc) {
            printf("\n=== Get no-motion configuration successful === \n");
            printf("axis_en = %x\n", no_mot_confg.axes_en);
            printf("duration = %x\n", no_mot_confg.duration);
            printf("threshold = %x\n", no_mot_confg.threshold);
        }

        any_mot_confg.axes_en = BMA456_EN_ALL_AXIS;
        any_mot_confg.duration = 5u; /* 5 * 20 ms = 100 ms */
        any_mot_confg.threshold = (0xCC); /* 5.11 G, 100 mg */

        no_mot_confg.axes_en = BMA456_EN_ALL_AXIS;
        no_mot_confg.duration = 5u; /* 5 * 20 ms = 100 ms */
        no_mot_confg.threshold = (0xCC); /* 5.11 G, 100 mg */

        rc |= bma456_set_any_mot_config(&any_mot_confg, &this->m_AccelDev);
        if (!rc) {
            printf("\n=== Set any-motion configuration successful === \n");
            printf("axis_en = %x\n", any_mot_confg.axes_en);
            printf("duration = %x\n", any_mot_confg.duration);
            printf("threshold = %x\n", any_mot_confg.threshold);
        }

        rc |= bma456_set_no_mot_config(&no_mot_confg, &this->m_AccelDev);
        if (!rc) {
            printf("\n=== Set no-motion configuration successful === \n");
            printf("axis_en = %x\n", no_mot_confg.axes_en);
            printf("duration = %x\n", no_mot_confg.duration);
            printf("threshold = %x\n", no_mot_confg.threshold);
        }

        {
            struct bma4_int_pin_config int_config;

            /* Configure INT1 pin */
            int_config.edge_ctrl = BMA4_LEVEL_TRIGGER;
            int_config.lvl = BMA4_ACTIVE_LOW;
            int_config.od = BMA4_PUSH_PULL;
            int_config.output_en = BMA4_OUTPUT_ENABLE;
            int_config.input_en = BMA4_INPUT_DISABLE;
            rc |= bma4_set_int_pin_config(&int_config, BMA4_INTR1_MAP, &this->m_AccelDev);
        }

        rc |= bma456_map_interrupt(BMA4_INTR1_MAP, BMA456_ANY_MOT_INT, BMA4_ENABLE, &this->m_AccelDev);
        rc |= bma456_map_interrupt(BMA4_INTR2_MAP, BMA456_NO_MOT_INT, BMA4_ENABLE, &this->m_AccelDev);
        {
            volatile bool trap = true;

            printf("Shake the sensor in any direction\n");
            while (trap) {
                /* Read the interrupt status */
                rc |= bma4_read_int_status(&int_status, &this->m_AccelDev);
                
                if (rslt == BMA4_OK) {
                    /* check if any/no motion interrupt is triggered */
                    if (int_status) {
                        printf("Any-/No-Motion interrupt occurred := %lu\n", int_status);
                        break;
                    }
                    else {
                        bma4_accel sens_data;
                        rc |= bma4_read_accel_xyz(&sens_data, &this->m_AccelDev);
                        printf("X := %i, Y := %i, Z := %i\n", sens_data.x, sens_data.y, sens_data.z);
                    }
                }

                int_status = 0;

                udelay(200u);
            }
        }
    }

    return rslt;
}

[rearmimator]

I found what was missing!

It seems to be that "soft-reset" command is doing a bit more, than simple reset.

Issuing soft-reset at the place where that code was remmed out by preprocessor directive made my day.

[shellywang · Accepted solution]

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