* [Bannana Pi](../master/docs/banana_pi.md)
* [Beaglebone Black](../master/docs/beaglebone.md)
+USB
+---
+* [FT4222](../master/docs/ftdi_ft4222.md)
+
Installing on your board
========
--- /dev/null
+FTDI FT4222H {#ft4222}
+============
+
+The FT4222H is a High/Full Speed USB2.0-to-Quad SPI/I2C device controller. Mraa
+supports it as a USB subplatform using the libft4222 library from FTDI which
+can be found
+[here](http://www.ftdichip.com/Support/SoftwareExamples/libft4222-1.2.0.240.tgz).
+
+The FT 4222H has 4 configuration modes selected by {DCNF1, DCNF0}. The c hip
+configuration mode will determine the number of USB interface s for data stream
+s and for GPIOs control. Mraa supports only chip CNFMODE0.
+
+Whilst mraa can support custom board in CNFMODE0 (support for other mode is
+welcome!) there may be some work to be done. We test using FTDI's UNFT4222EV
+reference board. More detail on this board can be found
+[here](http://www.ftdichip.com/Support/Documents/DataSheets/Modules/DS_UMFT4222EV.pdf).
+
+Interface notes
+---------------
+
+You will need to unload all ftdi kernel modules for libft4222 to work
+correctly. You will also have to compile mraa with FT4222 support which may not
+be enabled by default.