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关于ldc1000的spi通信问题



ldc上电后,即数字和模拟端都供电后,只连接spi的四根线到mcu,而其他脚都悬空,这种情况下能否读写ldc1000的寄存器。

为什么我在这种情况下都写不进数据,读数据也每次不一样,哪怕是读只读的寄存器(device id寄存器)每次读出的数据都不一样。