I2C Communication

Communication using the I2C interface

I2C, or Inter-Integrated Circuit, is a chip-to-chip interface supporting two-wire communication. You can open connections with individual chips and read and write over the connections. Create the interface object using thei2cfunction, and use thefreadandfwritefunctions for communication.

To use the I2C interface, you need to have either a Total Phase Aardvark host adaptor or a NI USB-845x adaptor board installed. SeeConfiguring I2C Communicationfor more details.

Functions

`i2c`	Create I2C object
`clear`	Remove instrument objects fromMATLABworkspace
`delete`	Remove instrument objects from memory
`disp`	Display instrument object summary information
`fclose`	Disconnect interface object from instrument
`fopen`	Connect interface object to instrument
`fread`	Read binary data from instrument
`fwrite`	Write binary data to instrument
`get`	Instrument object properties
`instrhwinfo`	Information about available hardware
`methods`	Class method names and descriptions
`record`	Record data and event information to file
`set`	Configure or display instrument object properties

Topics

Configuring I2C Communication
You need to have either a Total Phase Aardvark host adapter or a NI USB-845x adapter board installed to use thei2cinterface.
Transmitting Data Over the I2C Interface
Communicating over the I2C interface involves adapter discovery, connection, communication, and cleanup.
Install the NI-845x I2C/SPI Interface Support Package
For the Instrument Control Toolbox™ I2C and SPI interfaces, you can use either a Total Phase Aardvark host adaptor or an NI-845x adaptor.
I2C Interface Overview
Instrument Control Toolbox I2C support lets you open connections with individual chips and to read and write over the connections to individual chips.
I2C Interface Usage Requirements and Guidelines
These tips and guidelines apply to the use of the I2C interface.
Instrument Control Toolbox Properties
These properties are available in the toolbox.

Troubleshooting

Troubleshooting I2C Interface

Try these tips if you have problems using the toolbox with the I2C interface. Includes information about I2C supported platforms, adaptor requirements, and configuration and connection.

Featured Examples

Restoring the BlinkM to Its Factory Settings Using I2C Bus

Restore the BlinkM RGB LED to its factory settings by communicating with it over the I2C bus.

Tap Detection with ADXL345 Accelerometer Chip Using the NI USB 8451 Adaptor

读写数据从ADXL345 I2C启用ccelerometer chip using the NI® USB 8451 I2C adaptor. The accelerometer will be configured to detect a double tap and MATLAB® will be used to display a message that the chip has detected this.