I found there is an empty folder named "i2c_core" in the SDK_3.0.6.
Does it means you will have "common I2C driver" for I2C peripheral?
we have a couple of examples which are generic : the accelerometer (accel.c) and the eeprom driver which are in the SDK . Also, we have an i2c temp sensor example on the thread below.
We're working on tidying up the SDK to make it a bit more clearer, so in time there will be a simpler way to find common SPI/i2c drivers etc..