棋子 · 2020年02月17日

Definition of variables

I have an experience to develop C code for different microcontrollers and DSPs. However, this is first time to develop code for Arm Core microcontrollers. I am using STM32F334 and STM32F745 for different projects. Last couple of weeks, I have learnt to control peripherals and I hadn't calculated any mathematical expression. I started to write mathematical calculations and I realized they took a lot of time.

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极术小姐姐 · 2020年02月17日

What toolchain are you using?

Did you have the FPU enabled in all cases?

Remember that standard 'C' treats an "unadorned" floating constant as double.

Floating point will always take longer than integer arithmetic.

So, unless you really need it, stick to integer arithmetic!

Especially when it comes to something like a simple divide by 2 - which can be implemented as a shift.

https://floating-point-gui.de/

https://docs.oracle.com/cd/E1...

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