How to read data with multiple SPI slaves

Projects Networking, Protocols, and Devices
4

Then pylon is correct. The SD card is SPI Mode0, and yout RTD is Mode1. You must switch modes when accessing each device.

  // before enabling the RTC slave select when accessing the RTC
  SPI.setDataMode(SPI_MODE1); 

  // before calling any SD function
  SPI.setDataMode(SPI_MODE0);

edit: The way I do it is change the mode before accessing the Mode 1 device, then change the mode back to Mode 0.

  SPI.setDataMode(SPI_MODE1); 
  // do your RTC stuff here, then set the mode back to 0
  SPI.setDataMode(SPI_MODE0);