Leverage Existing Display Data Channel with I2C Adapter

You’ve been heard about the I²C before? However, do you know the exactly use of it?

I²C or Inter-Integrated Circuit is a two-wire serial bus that commonly used in computer for extremely low-level communication. I²C can easily found in the microcontrollers, embedded systems, and industrial computers.

DDC is simply an implementation of an I²C bus. The solid reason why you must use I²C because the cost is far cheaper than the Commercial USB to I²C, which can cost up to $100 to $250!

DDC is established in four wires: +5VDC, ground, serial data and serial clock, the pin numbers of which will also vary depending on the type of video port used.

For a 15-pin VGA cable, the pins function will be:

The I²C with three simple functions as:

I2Copen()

We generally open the I²C bus for communication.

I2Cmsg(short address, unsigned char *sendBuf, int sendBytes, unsigned char *replyBuf, int replyBytes)

Try to Issue an I²C request or read response for the opened I²C bus.

I2Cclose()

Close the opened I²C bus. All functions can be found on source code. [Link]