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Problems calibrating VL53L0X ToF distance sensor (VL53L0X_perform_offset_calibration, VL53L0X_perform_xtalk_calibration). bug?

GPodr.1
Associate II

Routine

VL53L0X_perform_offset_calibration from src/core/src/vl53l0x_api_calibration.cpp is giving strange results. By my opinion the problem is in uint16_t sum_ranging which should be of type uint32_t due to later bit shifting (<<16), which needs to be done due to fixed point arithmetics.

(I was performing this calibration at 270 mm distance, which is due to documentation not optimal one, but after the fixes it works fine).

In case of VL53L0X_perform_xtalk_calibration the same goes for multiple variables (sum_ranging, ...) that accumulate the range measurements performed by the routine. Unfortunately there are some other errors present due to which the calibration routine doesn't produce an appropriate XTalkCompensationRateMegaCps value. Due to the lack of understanding what this calibration routine is trying to compute, I am not able to figure it out why.

(I was performing this calibraton at 600 mm distance).

I am doing something wrong?

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