contiki-os/contiki — pull request #677 by medmig (2014-05-14 13:16:30+00:00)
Title: Add I2C library and example for CC2538 

Add one header file and one implementation file to use the I2C peripheral of the CC2538 platform.
Add a line in the CC2538 makefile to include the I2C library for compilation.
Also add an example to use the I2C library with two different sensors (TCN75 from Microchip and SHT21 from Texas Instruments).