Hi,
I am currently actively debugging and working with the sensor and it shows correct measurement data when i set the profile to 'Long range' example (settings from the 'um2039' User manual).
however the sensor response for RangeDMaxMilliMeter: always show a value around 1200 which should be around 2000, is there another settings which i need to do before the profile is actively set to long range?
Measurement data is now also correctly measured until about 1200mm but higher results in invalid measurements.
below are my settings as they are performed in the code:
MyDevice.I2cDevAddr = 0x52;
MyDevice.comms_type = 1; // 1 should equal I2C
MyDevice.comms_speed_khz = 100;
MyDevice.hi2c = hi2c;
VL53L0X_DEV = &MyDevice;
if (VL53L0X_DataInit(VL53L0X_DEV) != VL53L0X_ERROR_NONE)
{
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
if (VL53L0X_StaticInit(VL53L0X_DEV) != VL53L0X_ERROR_NONE)
{
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// Calibration steps
if (calibration->memory_valid != 0)
{
// SPADs calibration
VL53L0X_Error calibration_step = VL53L0X_SetReferenceSpads(VL53L0X_DEV,
calibration->refSpadCount,
calibration->isApertureSpads);
if (calibration_step == VL53L0X_ERROR_CALIBRATION_WARNING)
{
g_tof_state = tof_sensor_reset_sensor;
return HAL_TIMEOUT;
}
else if (calibration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// Temperature calibration
calibration_step = VL53L0X_SetRefCalibration(VL53L0X_DEV,
calibration->pVhvSettings,
calibration->pPhaseCal);
if (calibration_step == VL53L0X_ERROR_CALIBRATION_WARNING)
{
g_tof_state = tof_sensor_reset_sensor;
return HAL_TIMEOUT;
}
else if (calibration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// Offset calibration
calibration_step = VL53L0X_SetOffsetCalibrationDataMicroMeter(VL53L0X_DEV,
calibration->pOffsetMicroMeter);
if (calibration_step == VL53L0X_ERROR_CALIBRATION_WARNING)
{
g_tof_state = tof_sensor_reset_sensor;
return HAL_TIMEOUT;
}
else if (calibration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// Crosstalk calibration and enabling
calibration_step = VL53L0X_SetXTalkCompensationRateMegaCps(VL53L0X_DEV,
calibration->XTalkCompensationRateMegaCps);
if (calibration_step == VL53L0X_ERROR_CALIBRATION_WARNING)
{
g_tof_state = tof_sensor_reset_sensor;
return HAL_TIMEOUT;
}
else if (calibration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
calibration_step = VL53L0X_SetXTalkCompensationEnable(VL53L0X_DEV, 1);
if (calibration_step == VL53L0X_ERROR_CALIBRATION_WARNING)
{
g_tof_state = tof_sensor_reset_sensor;
return HAL_TIMEOUT;
}
else if (calibration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// Configuration steps (!!!!!!!!!!!! Long range mode !!!!!!!)
// Limit check value >> 1
VL53L0X_Error configuration_step = VL53L0X_SetLimitCheckValue(VL53L0X_DEV,
VL53L0X_CHECKENABLE_SIGNAL_RATE_FINAL_RANGE,
(FixPoint1616_t)(0.1 *65536));
if (configuration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// Limit check value >> 2
configuration_step = VL53L0X_SetLimitCheckValue(VL53L0X_DEV,
VL53L0X_CHECKENABLE_SIGMA_FINAL_RANGE,
(FixPoint1616_t)(60 *65536));
if (configuration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// Measurement timing budget
configuration_step = VL53L0X_SetMeasurementTimingBudgetMicroSeconds( VL53L0X_DEV, 33000);
if (configuration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// VCEL pulse period 1
configuration_step = VL53L0X_SetVcselPulsePeriod(VL53L0X_DEV,
VL53L0X_VCSEL_PERIOD_PRE_RANGE, 18);
if (configuration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// VCEL pulse period 2
configuration_step = VL53L0X_SetVcselPulsePeriod(VL53L0X_DEV,
VL53L0X_VCSEL_PERIOD_FINAL_RANGE, 14);
if (configuration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}
// Device mode
configuration_step = VL53L0X_SetDeviceMode( VL53L0X_DEV, VL53L0X_DEVICEMODE_SINGLE_RANGING);
if (configuration_step != VL53L0X_ERROR_NONE)
{
// Some error
g_tof_state = tof_sensor_reset_sensor;
return HAL_ERROR;
}Another problem i am facing is that when i connect the sensor to my devkit (NucleoF401RE) and initialize the sensor from bootup the first data i receive is incorrect and i need to power cycle the sensor before (and reinitialize) before i get correct measurement data, is there a sensor power on time before communications/configurations can start?
King regards,
Richard
1 ACCEPTED SOLUTION
Accepted Solutions
Hi,
After throwing away the RangeDMaxMillimeter variable problem i am now left with the reason why my sensor does not measure beyond 1,2m. as soon as the measurement goes beyond 1,2m i get the following resulting measurement data:
Can anybody help me make sens of the values to check where the problem is (in software or surrounding noise etc).
The RangeMillimeter variable holds a value 8190 if i go beyond 1,2m from the sensor, before the 1,2m it holds an accurate value.
Kind regards,
Richard
