Interesting USB To I2C Bridge Project
i2c usb project board
Here is and interesting FTDI project blog involving interfacing an IO board from a pc using rs232 to i2c conversion. It involves the FT2232D chip of the new FTDI USB generation. The fellow tried to order a development kit but his order never came through so he had to cancel it. Instead he created a hardware board to interface to an i2c IO board that he had.
This design, although its performance it not that fantastic, lets you cheaply interface a PC computer running Linux, windows or OSX with any customized external board that uses a i2c bus as communication. Be adware of the fact that this only works with the newer series of FTDI named 2232C or 2232D.
In using the FTDI chips D2XX mode, which is meant for lower level design and special modes, there are a set of files named ftd2xx.dll, ftd2xx.lib, and ftd2xx.h that are the minimum files that you need to start making FTDI programs with visual studio.
Also he found that if you want to create an interface to an i2c bus, you must also download an extra development package called MPSSE. Since most people use the Virtual Comport (VCP) mode of the FTDI, this shows that there are other modes of the FTDI chipset.
Another project involves the latest FTDI chipset series 2232H. This chip has 4096 buffers on board and is capable of 4 megabits per second.
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