There is an I2C interface available on the Colibri module.
Toradex provides an simple Library to access the I2C unit under Windows CE.
In the standard image, this interface is also used by the RTCSync tool. To avoid conflicts in the I2C register accesses, the RTCSync can be disabled or a mutex can be used.
RTCSync can be disabled by renaming the key value in registry.
Using a mutex
The name of the mutex used for I2C accesses is "I2C".