I2C Communication

Communication using the I2C interface

I2C, or Inter-Integrated Circuit, is a chip-to-chip interface supporting two-wire communication. You can connect to I2C peripheral devices and read from and write to them. Create the interface object using the device function with an aardvark or ni845x object.

To use the I2C interface, you must have either a Total Phase^® Aardvark I2C/SPI™ Host Adapter or an NI™ USB-8451 or USB-8452 I2C/SPI Interface Device installed.

Functions

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Discover and Connect

`aardvarklist`	List available Total Phase Aardvark controllers (Since R2023a)
`aardvark`	Total Phase Aardvark Adapter connection (Since R2023a)
`aardvarkfind`	Find Total Phase Aardvark controllers (Since R2024a)
`ni845xlist`	List available NI USB-845x controllers (Since R2023a)
`ni845x`	NI USB-845x connection (Since R2023a)
`ni845xfind`	Find NI USB-845x connections (Since R2024a)
`scanI2CBus`	Scan for I2C peripheral devices connected to controller board (Since R2023a)
`device`	I2C peripheral device connection (Since R2023a)

Configure and Communicate with DIO Pins

`configureDigitalPin`	Set digital pin mode on controller (Since R2023a)
`readDigitalPin`	Read logic level value of digital pin on controller (Since R2023a)
`writeDigitalPin`	Write logic level value to digital pin on controller (Since R2023a)

Communicate with I2C Peripheral Devices

`read`	Read data from I2C peripheral device (Since R2023a)
`write`	Write data to I2C peripheral device (Since R2023a)
`readRegister`	Read data from I2C peripheral device register (Since R2023a)
`writeRegister`	Write data to I2C peripheral device register (Since R2023a)

Topics

I2C Interface Overview
Connect to I2C controller boards and peripheral devices and communicate with them from MATLAB^®.
Configure I2C Controller Board Communication
Discover and connect to Total Phase Aardvark™ or NI USB-845x controller boards using the aardvark or ni845x interface.
Transmit Data to Peripheral Device Over I2C Interface
Communicate with an I2C peripheral device connected to a Total Phase Aardvark or an NI USB-845x controller board.
Install Instrument Control Toolbox Support Package for Total Phase Aardvark I2C/SPI Interface
Install the support package for a Total Phase Aardvark controller to communicate with I2C and SPI interfaces in MATLAB.
Install Instrument Control Toolbox Support Package for National Instruments NI-845x I2C/SPI Interface
Install the support package for an NI USB-845x controller to communicate with I2C and SPI interfaces in MATLAB.
Transition Your Code to aardvark or ni845x Interface
Create I2C connections using the device function with an aardvark or ni845x object instead of i2c.

Troubleshooting

Troubleshooting I2C Interface

Troubleshoot the I2C interface.

Featured Examples

Restore BlinkM LED to Factory Settings Using I2C Bus

Restore a BlinkM RGB LED to its factory settings by communicating with it over the I2C bus using a Total Phase Aardvark controller board.

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Tap Detection with ADXL345 Accelerometer Chip Using NI USB-8452 Controller

Write and read data from an Analog Devices® ADXL345 I2C enabled accelerometer chip using the NI™ USB-8452 controller.

Open Live Script

Measure Temperature from I2C Peripheral Device on NI USB-8452 Controller

Communicate with a TMP102 temperature sensor on NI USB-8542.

Open Live Script