Arduino Wifi Shield SPI commands

Question

I'm currently using the Arduino Wifi Shield . It works fine with the Arduino Library, but I have a project in which I need to get rid of all the Arduino library, and use only the AVR-libc.

Therefore, in order to use the Wifi shield, I would like to know where there is a documentation about the protocol used on the SPI bus between the arduino and the shield, so that I do not need to use the Wifi Library.

Am I forced to look at the source code, or does any document exist?

Thanks.

Answer 1

The documentation for SPI will be contained in the datasheet for the MCU used in the Arduino. For AVR-based Arduinos, look in the section titled "SPI – Serial Peripheral Interface". For the Arduino Due, see the "Serial Peripheral Interface (SPI) Programmer Datasheet" section.