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CubeIDE Tips

Initial Setup

• To resolve FPU warning ("FPU is not initialized, but the project is compiling for an FPU. Please initialize the FPU before use."):

  Project $\to$$\to$ Properties $\to$$\to$ C/C++ Build $\to$$\to$ Settings $\to$$\to$ MCU Settings $\to$$\to$ Tool Settings

  Set Floating-point unit to None

  Set Floating-point ABI to Software implementation (-mfloat-abi=soft)

Debugging Tips

• To see the snapshot of CPU registers (RCC registers, GPIO peripheral registers, etc.):

  Window $\to$$\to$ Show View $\to$$\to$ SFRs

Optimization

• To change the optimization level:

  Project $\to$$\to$ Properties $\to$$\to$ C/C++ Build $\to$$\to$ Settings $\to$$\to$ MCU GCC Compiler $\to$$\to$ Optimization

• Whenever you change the optimization level, do clean followed by build.

• When you start optimizing your code, your code becomes more difficult to debug with disassembly since they do not exactly match 1-to-1 any more.

• Also, to protect your code from failing by optimization, be sure to use volatile keyword for the variable whose value is expected to change over the course of execution. See volatile Type Qualifier.

References

Nayak, K. (2022). Microcontroller Embedded C Programming: Absolute Beginners [Video file]. Retrieved from https://www.udemy.com/course/microcontroller-embedded-c-programming/

Nayak, K. (2022). Embedded Systems Programming on ARM Cortex-M3/M4 Processor [Video file]. Retrieved from https://www.udemy.com/course/embedded-system-programming-on-arm-cortex-m3m4/