Adding I2C functionality to the FX2 device. (Tested with a 24C256 EEPROM)

[RacingTornado]

This commit adds I2C functionality to the eeprom. The same steps are applicable to this pull request to make and build use the following steps:
To run this first clone the repository, then cd to the fx2lib directory and checkout this particular branch.
After this run 2 commands:
git submodule init
git submodule update
make
After this , navigate to the examples/i2c_bitbang directory and execute the following commands:
make
Now push the FX2 device inside the USB port(remove any udev rules you may have set up for Cypresse's VID and PID) and run
make fx2_download
After this open minicom
sudo minicom -H -w name_of_configuration
You should see the data which is read from the EEPROM displayed on your console. Make sure the UART0 pins are connected to the appropriate GPIO's on the FX2.

A couple of things to take care are that the I2C is in non-blocking mode. So often the same data is printed(that is previous data) if new data has not arrived. By using a logic analyzer the I2C can be confirmed to work. Otherwise we would need to busy wait in the loop which removes any benefit we may get from using queues.

[mithro]

3?

[RacingTornado]

Retries 3 times.

[mithro]

This needs a huge amount of work.

• You fail on consistency, formatting, etc.
• The queue structure you have created does a huge amount of work which seems pointless.
• You are confusing low level details with high level details.
• The I2C state machine is really hard to follow.
• You don't deal with things like 8bit verse 16bit I2C addresses.