The QT600 Interface Board and AVR QTouch Studio can be used to read touch data from any application based on the QTouch Library. The only requirement is that there is two I/O pins available and that there is enough free space in flash for the debug protocol and serial interface driver.
You can choose among three interfaces:
SPI
TWI
Bit banged SPI (one way communication)
The preferred interface would either be SPI or TWI, since these will also be able to transport data to the application (2-way interface). This is useful to configure the touch library parameters in the touch MCU from the AVR QTouch Studio front-end.
Recommend maximum speed for the SPI and TWI interfaces are:
SPI: 200 KHz
TWI: 100 KHz
Complete firmware driver files are available in the QT600 example projects, which can be downloaded from www.atmel.com/QT600. See the readme.txt file found in the QT600 Example Projects folder for instructions on how to add the QT600 protocol files to your firmware project.