RANGING_FREQUENCY - VL53L8A

drodriguez_id · ‎2024-05-20

Hi,

I am testing VL53L8A with NUCLEO-F401RE and 53L8A1_SimpleRanging software under STM32CubeIDE.

Changing RANGING_FREQUENCY from 5U to 15U does not increase the frame rate, always 5Hz.

What am I doing wrong? I have changed also the TIMING_BUDGET to 5U (ms).

#define TIMING_BUDGET (5U) /* 5 ms < TimingBudget < 100 ms */

#define RANGING_FREQUENCY (15U) /* Ranging frequency Hz (shall be consistent with TimingBudget value) */ // era 5

#define POLLING_PERIOD (1000U/RANGING_FREQUENCY) /* refresh rate for polling mode (milliseconds) */

Thanks,

David

Anne BIGOT · ‎2024-05-21

Hello,

Your request was raised internally. We will come back to you soon.

Best regards

Anne

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Anne BIGOT · ‎2024-06-14

The application example is not really optimized and shows a HAL_Delay(POLLING_PERIOD) in acquisition loop which is not mandatory and shall be removed because the VL53L8A1_RANGING_SENSOR_GetDistance() is already polling for results as we configure RS_MODE_BLOCKING_CONTINUOUS in VL53L8A1_RANGING_SENSOR_Start()

However, UART speed and printf() functions may limit the actual ranging frequency too.
A better way should be to store several results in buffer before display with timestamping by HAL_GetTick() for instance to figure out the actual ranging frequency achieved.

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