Hi all,

I'm trying to use the SHIFTOUT and SHIFTIN commands on a 18F4550 to control and NFC module. The port labels on the 18F4550 refer as SCK, SDI, and SDO. However, the SPI ports on the NFC module are named MOSI, MISO, SCK, SSEL.

The SSEL can be any of the PIC I/O digital pins. All it's needed is a change of state to LOW to enable the SPI communication. Now, are we talking about two different types of SPIs here since the names are different. How do the SDI and SDO relate to the MISO and the MOSI?

Any help will be greatly appreciated. Thank you,

Robert