For the new world For the new world

Setup the RCC and timer value. Usart with DMA will be used to reduce the CPU loads. ProsUsing DMA with UART2 allows long data transmissions to run in the background without blocking the CPU.UART DMA provides stable and reliable streaming, which is ideal for continuous debug logs and telemetry.Because UART has no strict timing requirements, DMA works smoothly and consistently without communica..