I2C Device Drivers

• include/nuttx/i2c/i2c_master.h and include/nuttx/i2c/i2c_slave.h. All structures and APIs needed to work with I2C drivers are provided in this header file.

• struct i2c_ops_s. Each I2C device driver must implement an instance of struct i2c_ops_s. That structure defines a call table with the following methods:

• Binding I2C Drivers. I2C drivers are not normally directly accessed by user code, but are usually bound to another, higher level device driver. In general, the binding sequence is:

  1. Get an instance of struct i2c_master_s from the hardware-specific I2C device driver, and

  2. Provide that instance to the initialization method of the higher level device driver.

• Examples: arch/z80/src/ez80/ez80_i2c.c, arch/z80/src/z8/z8_i2c.c, etc.

• struct i2c_slaveops_s. Each I2C slave device driver must implement an instance of struct i2c_slaveops_s. That structure defines a call table with the following methods:

• Binding I2C Slave Drivers. I2C slave drivers are normally directly accessed by user code, We can read and write to device nodes using posix interfaces.