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TFT屏幕和CC1101公用同一个SPI接口，怎么分开用这两个模块?
有一根线叫 CS
通过片选信号来分时复用
一路用cs做片选，一路用其他io口做片选
一个模块用cs引脚作片选，另一个模块用一个普通io做片选
