SD card and MCP23s17's on SPI buss

Projects Programming
1

I'm trying to build an app that uses both the SD card and the MCP23s17. Each is initialized with a separate chip select pin.
Since they share the SPI.h library, do the chip select pins have to be the same?
If yes, what is, or how do I find the address of the SD card so I can set the MCP23s17 addresses not to conflict?

Thanks in advance!

Cannibal

2

SPI shares SCK, MOSI, MISO among devices. (connected in parallel).
Each device needs a unique chip select pin.
There is no addressing as there is with I2C. The chip select does it all.

3

Ok,
The MCP23s17 is a little different, has three address pins that allow up to 8 devices on the same chip select line if properly enabled.
I just didn't know if the SPI library could accommodate more than one CS.
Sounds like it can.
Many thanks.
Cannibal

4

cannibalrobot:
Ok,
The MCP23s17 is a little different, has three address pins that allow up to 8 devices on the same chip select line if properly enabled.
I just didn't know if the SPI library could accommodate more than one CS.
Sounds like it can.
Many thanks.
Cannibal

I think you are confusing /CS with the address pins. the 23s17 only has one chip select line.