Why the VL53L1 sensor VL53L1_Dev_t object consumes 5.43KB(Kilo Bytes) RAM in api ver 1.1.37.12156 where as the same object consumes 932B in api ver 1.2.11.1840 ?

NKuma.10 · ‎2018-11-25

Hi,

I am porting the one of legacy VL53L1 stack (STM api ver 1.1.37.12156 ) for one of the project. This stack is stable and well tested. However, i am surprised to see the RAM consumption(5.43KB) of the VL53L1_Dev_t object. This is different in new STM api ver 1.2.11.1840 (932B). I can understand that new api might have optimized or deprecated some of implementations.

Why is VL53L1_Dev_t object consuming RAM memory of 5.43KB? It will really help me if any change list file is available to download or can provide here.

John E KVAM · ‎2019-04-24

In the file:

vl53l1_platform_user_config.h

is the line:

#define VL53L1_MAX_USER_ZONES               16

By lowering the number of zones, the data structure is GREATLY reduced.

What you are seeing is the result of the lower number of zones.

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