Well,
the Arduino UNO is now out for a little time...
So i got the Ethernetshield, and everywhere it says you can use pin 13 and so...
Arduino communicates with both the W5100 and SD card using the SPI bus (through the ICSP header). This is on digital pins 11, 12, and 13 on the Duemilanove
It doesnt say UNO, and also i dont see any connections on the board to the pins 10-13 or even at all...
so.. Does it use the ICSP header now and i can use all pins?
Three of the ICSP pins are connected ON THE ARDUINO (INCLUDING THE UNO) to pins D11, D12, and D13. You can't use those for Digital I/O.
You should see a connection to D10 and , I think, D4 which are used for Slave Select pins for the W4100 and SD card. If the board has more than two layers of traces the connections could be on an internal layer.
I see.. So i cant use SPI and an Ethernetshield together?
SPI can communicate with multiple devices. That's how the Ethernet shield works now. Each device requires its own chip select.
Science:
I see.. So i cant use SPI and an Ethernetshield together?
One thing to watch out for is the Ethernet or SD libraries changing SPI settings (bit order, speed, mode) when you use them. Any time you use more than one SPI device you should set the SPI settings appropriate for that device each time you use it.