F_CPU is not defined in sketches · Issue #778 · rogerclarkmelbourne/Arduino_STM32 · GitHub
No definition found - PlatformIO IDE - PlatformIO Community
Fix the F_CPU frequency definition for the ESP32-S3 in esp32-hal.h by devrim-oguz · Pull Request #7913 · espressif/arduino-esp32 · GitHub
Any way to suppress the F_CPU refine warnings? · Issue #6 · bigjosh/Move38-Arduino-Platform · GitHub
c - Why does IntelliSense say it cannot find DDRB definition when I added it to json and it can even let me peek the definition? Visual Studio Code - Stack Overflow