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Code for STM32F030F4 chinese board USART Rx by interrupts, Tx by DMA
- Toggle onboard green LED once per second.
- Echo received by USART1 data (not more than 64 bytes including '\n') on B115200:
- if PA6 not connected to ground echo text directly
- otherwice echo it reversly
- Light up LED on PA5 (opendrain) when receive data and turn it off when send.