added informative comments

IOBoard.cpp

@@ -126,6 +126,7 @@ void transferSPI(uint8_t address, uint8_t *data, size_t datalen) {
     // requires the slave select to be driven low.
     CS_PORT = ~address;
     SPI.transfer(data, datalen);
+    // some MGM stuff. This delay might not be needed for other devices.
     delay(100);
     // Pull the slave select high again.
     CS_PORT = 0xff;