Getting access to I2C devices

Now we are ready to manage real I²C devices. We can find tons of supported devices into the Linux kernel tree whose are usually grouped according to their specific operations so, for instance, all I²C real-time clock chips are under the directory drivers/rtc/ while I²C EEPROMs are under directory drivers/misc/eeprom/, and so on of the Linux's source repository.

In the next section we're going to see several different kinds of devices all connected to the main CPU through the I²C bus, also we're going to use different embedded kits to test them, but as said before, every commands can be easily repeated on every GNU/Linux based boards with a similar configuration.

EEPROM, ADC and IO Expander

As first example we're going to use the following development board carrying five I²C devices:

Note

The device can be purchased at the following link (or by surfing the Internet): http://www.cosino.io/product/i2c-sensors-board

On this board we have an EEPROM, an ADC, a DAC...