This is a preview version of the DisplayLink DL-7450 Software Development Kit Documentation. The functionality that is described and made available in this version is subject to addition, removal or change without warning.

class I2C – manage a DL-7450 I2C bus

The I2C class provides an interface to one of DL7450’s I²C buses.

Constructor

class i2c.I2C(bus=i2c.Bus.I2C1)

Obtain an interface to an I²C interface. At present, the DL7450 SDK only provides access to devices on the I2C1 bus. Calling this function with any other parameters will result in an I2cError being raised.

The module factory function i2c.i2c is equivalent to creating an I2C object directly.

Methods

There are two main methods, read and write. These functions take care of initiating the underlying I²C operation, and allow the application to focus on transferring data to and from the devce. Please read the

I2C.read(address, register, nbytes) → bytearray

This method attempts to read data from a device node on the I²C bus. The parameters are

address: the 7-bit base address of the device node.

register: the sub-address, or register address, to read data from. The register addresses of a particular I²C device will be described in the vendor’s datasheet.

nbytes: the number of bytes to read.

If successful, this method returns a Python bytearray holding the data.

I2C.write(address, register, payload)

This method attempts to Write data to a device node on the I²C bus. The parameters are

address: the 7-bit base address of the device node.

register: the sub-address, or register address, to read data from. The register addresses of a particular I²C device will be described in the vendor’s datasheet.

payload