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SPI CS line的问题

 

 

 

想问诸位大神个问题, 最近做的SPI收发程序中,发现有时候cs在片选线会成出被拉高一下,使得数据传输失效。如图示:

最后一根 CS 线的时序。 正常情况下是没有中间3个被拉高的情况,始终找不到原因,请帮助下。