:class:`I2C` --- 两线串行协议
=======================================

类
-------

.. class:: GPIO(...)


使用示例::

    import haascv
    from haascv import driver

    i2cObj = driver.i2c();#获取i2c类对象
    i2cObj.open(port, 8,  i2cObj.DRIVER_I2C_BIT_RATES_100K,
                i2cObj.DRIVER_I2C_MODE_MASTER, 0x70, 0)#配置i2c模块

    i2c_read_buf = bytearray(6)#定义存储读取数据的对象
    i2c_write_buf = bytearray([1, 2, 3, 4, 5, 6])#定义待写的数据

    print(i2c_write_buf)#打印写的buffer
    i2cObj.write(i2c_write_buf)#开始写数据

    i2cObj.read(i2c_read_buf)#读取数据
    print(i2c_read_buf)#打印读取的数据

    i2cObj.close()#关闭i2c模块

常量
---------



.. data:: I2C 模式:

        .. data:: DRIVER_I2C_MODE_MASTER
        .. data:: DRIVER_I2C_MODE_SLAVE
        .. data:: DRIVER_I2C_MODE_MASTER_SOFT


.. data:: I2C bit rate：

        .. data:: DRIVER_I2C_BIT_RATES_100K
        .. data:: DRIVER_I2C_BIT_RATES_400K
        .. data:: DRIVER_I2C_BIT_RATES_3400K


.. data:: I2C 地址宽度:

        .. data:: RIVER_I2C_ADDRESS_WIDTH_7BIT
        .. data:: DRIVER_I2C_ADDRESS_WIDTH_10BIT


操作函数
-------

.. method:: open(port, addr_width, freq, mode, addr, priv)

        打开I2C模块

.. method:: close()

        关闭I2C模块

.. method:: read()

        读取I2C数据

.. method:: write()

        发送I2C数据