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TMS320C6678只能挂2个SPI外设，SPISCS0选择1个，SPISCS1选择1个，不是二进制形式可以支持4个SPI外设
一个片选信号接一个器件，跟2复4是两个概念。
那就是TMS3206678只能接两个SPI外设对不？
是的，一个片选信号接一个spi外设。
