Mifare RC522 reader

Hello all

I bought a Mifare RC522 reader card on ebay a while ago.
http://www.uctronics.com/static/images/20130426/rfid-mifare-rc522-card-reader-module-9ba99b03-800x800.jpg
Now i digged it out from the drawer and trying to use it.

I found rfid library that is said to be compatible for the RC522.

But there is something i dont understand.
The examples define the following pins:

  • Reset
  • SPI SS
  • SPI MOSI
  • SPI MISO
  • SPI SCK

But the card i have don’t have any SS pin.
It has SDA, SCK, MOS, MIS, NC, GND, RST and VCC

Is SDA same as SS ?
Or do I need another library?

Any help will be appreciated

Best regards
Per

For the RC522 the pin named SDA is SPI SS if the SPI interface is configured (configured interface is determined by the pins I2C and EA).