Solved
Can anyone tell me how to check do i need USART hardware for stm32f103rbt6 or inbuilt? or just usb cable is enough for that?
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Yes, sounds like a home-work problem.
The ST-LINK VCP for the NUCLEO board should be enough to talk back-and-forth with the STM32 USART. As I recall USART2 via PA2/PA3, but check the manual/schematic.
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