SPI通信无效

这些线路不应该是浮动的，但由于lsm是主机，因此可能在这些线路上有上拉电阻，也许你可以测量这些引脚上的电压。无论如何，我认为这不会影响你的阅读。也许仔细检查您的SPI配置，因此速度不应高于10MHz，8位数据大小。此外，如果您使用NSS引脚可能会切换到软件控制引脚。至少对我来说，NSS在切换到软件CS引脚后没有工作，它工作正常，我可以从LSM6读取数据



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Those lines shouldn't be floating for sure but since lsm is a master here it might have pull-ups on those lines maybe you can measure voltage on those pins. Anyway I don't think it would affect your readings. Maybe double check your SPI configuration so speed shouldnt be higher than 10MHz with 8bit Data size. Also if you are using NSS pin maybe switch to software controlled pin. Since at least for me NSS didn't work as it should after switching to software CS pin it worked and I can read the data from LSM6

我不知道你输错了这个值，但是对于LSM6DS3，WHO_AM_I命令是0x0F而不是0x8F。



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I don't know if you mistyped the value, but the WHO_AM_I Command is 0x0F and not 0x8F for LSM6DS3.

默认情况下，大多数mems使用3线模式（详细不知道这个）。当NSS为低时，选择芯片。当NSS为高电平时，它使用I2C（因此，如果使用多个SPI从器件，请务必小心）。要激活4线模式，您可以（在3线模式下）在芯片内写入一个位以激活4线模式。然后阅读WHO_AM_I可能会有效......
希望这可以帮助。祝你好运！



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By default, most mems use 3 wire mode (don't know this one in details). When NSS is low, the chip is selected. When NSS is high, it uses I2C (so be careful if using multiple SPI slave devices). To activate the 4 wire mode, you may have (in 3 wire mode) to write a bit inside the chip to activate the 4 wire mode. Then reading the WHO_AM_I may work...
Hope this helps. Good luck!