Arduino for STM32

Thanks, I try this later

I am going to use 2 serial ports in my STM32F103C8 project. My development environment is Windows 10, Arduino IDE 1.8.15, Arduino_Core_STM32 2.0.0 My testing code is: void setup() { Serial1.begin(115200); Serial2.begin(115200); } void loop() { } build_opt.h -DENABLE_HWSERIAL2 I got compilation error...

I am Jason, a beginner of stm32duino. I am working on a STM32F103C8 from taobao with different types of sensors.