UART asynchronous communication:
http://blog.csdn.net/gogomusic/article/details/54767502
SPI synchronous communication:
http://blog.csdn.net/gogomusic/article/details/54783969
IIC synchronous communication:
http:// blog.csdn.net/gogomusic/article/details/79344139
Three major communication protocols--UART, SPI, IIC
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