LIS3MDL SPI总线多数传感器停止工作

嗨，

我设计了一个在1 spi总线上有8个LIS3mdl传感器插槽的电路。
当我只将一个ls3mdl传感器（其他7个是空的）连接到电路板时它的问题很好。但是当我连接另一个（有时是2个，有时是3个或4个或更多）时，大多数传感器都停止工作。 （它读取寄存器值，但错误的参数返回）在这种模式下，我正在逐个读取传感器。（使SS（芯片选择）0中的一个与传感器通信并使其成为1然后对下一个传感器执行相同操作）。当我将传感器的数量减少到1时，它立即正常工作，当更多的传感器出错时。
我自己认为出现这个问题是因为当其他传感器的SS引脚很高时，这意味着它们处于i2c模式，并且它们在总线上通过I2C进行通信并且它会发生冲突（我看到错误的数据出现在调试模式和示波器中）
我曾经问过这个问题是因为s​​pi总线上的电流很小所以我只启用了微控制器（STM32f407vgt6）miso mosi sck和ss引脚的内部上拉。
我的SPI总线就像图像
图片。
谁能帮我？



#lis3mdl #spi #spi-bus



以下为原文




Hi,


I have designed a circuit which has 8 LIS3mdl sensor slot on 1 spi bus.
The problem when I connect only one ls3mdl sensor (other 7 are empty) to the board it works well. but most of the when I connect another one ( sometimes 2 and sometimes 3 or 4 and more) all sensor stop working. ( it reads the register values but the wrong parameter get back) in this mode, I am reading sensors one by one.(make one of SS(chip select) 0 talk to sensor and make it 1 and then do the same with next sensor). Immediately when I reduce the number of sensors to 1 it works correctly and when and more sensor it goes wrong.
I myself think that the problem appears because when SS pin for other sensors is high and it means they are in i2c mode and they talk in I2C on the bus and it makes conflicting(i saw wrong data coming in debug mode and in oscilloscope)  
I once though the problem is because of low current on spi bus so I enabled only internal pull-up of Microcontroller(stm32f407vgt6) miso mosi sck and ss pins.
my SPI bus is something like the image
image.  
Can anyone help me?



#lis3mdl #spi #spi-bus