After last update of PlatformIO, it can’t compilate code even with [Serial.begin()]. Simple code is compilate fine.
Please share the platformio.ini
file. It seems to me you updated dev-platform (frameworks) to the latest versions which could potentially break your API.
Seems to me like your Arduino framework got corrupted (specifically the HardwareSerial code). Can you remove the C:\Userse\Egor_\.platformio\packages\framework-arduino-avr
folder and build again?
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Thanks for support!
It’s working now