esp8266_i2c_master

Drop in replacement for the IoT demo i2c_master.c and i2c_master.h

This implementation allows the I²C pins to be defined with only two #defines.

It also has easy to use convenience methods i2c_master_writeRegister() and i2c_master_readRegister().

To define the SDA and SCL pins you just add CFLAGS="-DI2C_MASTER_SDA_GPIO=2 -DI2C_MASTER_SCL_GPIO=12" (or whatever pin numbers you preffer), to your Makefile. Alternatively you can define them in user_config.h

If no gpio pin numbers are assigned the default SDA=2, SCL=12 pins will be used.

TODO:

• ~~Testing~~ It passes the mcp23017 basic tests, but one can't test too much..
• ~~implement the added convenience methods i2c_master_writeRegister() and i2c_master_readRegister()~~