How to solve the problem that the data values ​​of float type variables appear differently when debugging?

[bupark007]

I'm trying to figure out why the value 4.2 is returned as -2 when passed as a function argument. Could you please also provide a solution? The MCU is an STM32F302VET.

[TDK]

Is optimization turned off?

[Ghofrane GSOURI]

Hello @bupark007 

As mentioned by @TDK  using high optimization levels can cause variables to be kept in CPU registers or even optimized away, making them difficult to inspect during debugging. To address this, try setting the optimization level to -O0 (no optimization) when debugging your code.

THX

Ghofrane

[Tesla DeLorean]

I'd probably instrument, and call test cases with terminal output to confirm the functionality.

I think there are reported issues with the debugger's memory/expression view.

Check you have pulled libraries with sscanf / printf support of floating point.

Inspect code generated by the compiler for consistency, double check the casting of the math at each stage.