32 lines
1.2 KiB
ReStructuredText
32 lines
1.2 KiB
ReStructuredText
==================
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I2C Device Drivers
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==================
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- ``include/nuttx/i2c/i2c_master.h`` and ``include/nuttx/i2c/i2c_slave.h``.
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All structures and APIs needed to work with I2C drivers are provided in
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this header file.
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- ``struct i2c_ops_s``. Each I2C device driver must implement
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an instance of ``struct i2c_ops_s``. That structure defines a
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call table with the following methods:
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- **Binding I2C Drivers**. I2C drivers are not normally directly
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accessed by user code, but are usually bound to another, higher
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level device driver. In general, the binding sequence is:
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#. Get an instance of ``struct i2c_master_s`` from the
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hardware-specific I2C device driver, and
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#. Provide that instance to the initialization method of the
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higher level device driver.
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- **Examples**: ``arch/z80/src/ez80/ez80_i2c.c``,
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``arch/z80/src/z8/z8_i2c.c``, etc.
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- ``struct i2c_slaveops_s``. Each I2C slave device driver must implement
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an instance of ``struct i2c_slaveops_s``. That structure defines a call
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table with the following methods:
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- **Binding I2C Slave Drivers**. I2C slave drivers are normally directly
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accessed by user code, We can read and write to device nodes using posix
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interfaces.
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