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多通道缓冲串口配置成spi模式时，最大的发送和接收速度是多少？
这个数据可以参考28335datasheet的McBSP as SPI Master or Slave Timing章节。
master的时候可以是25mhz，slave的时候是LSPCLK/16 = 4.6875 MHz.
