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writeRegister

Write data to I2C peripheral device register

Since R2023a

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    Syntax

    writeRegister(peripheral,registerAddress,data)
    writeRegister(peripheral,registerAddress,data,datatype)

    Description

    example

    writeRegister(peripheral,registerAddress,data) writes the values of data as uint8 to the specified register memory address registerAddress of the I2C peripheral device peripheral. This operation is done in a single I2C transaction.

    writeRegister(peripheral,registerAddress,data,datatype) writes data in the form specified by datatype, regardless of the format in data.

    Examples

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    Connect to an I2C peripheral device on an NI™ USB-845x controller and write data to a register on it.

    Connect to the NI USB-845x using its serial number. In this example, the NI USB-845x controller board that is connected to the computer has the serial number 01F26E0A.

    controller = ni845x("01F26E0A");

    Connect to an I2C peripheral device on the controller board. In this example, the peripheral has an address of 0x48.

    peripheral = device(controller,I2CAddress="0x48");

    Write the value 10 to the register at address 1 as uint8 values.

    writeRegister(peripheral,1,10);

    Input Arguments

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    I2C peripheral device, specified as a device object.

    Example: writeRegister(peripheral,registerAddress,data) writes to a register on the I2C peripheral device object peripheral connected to an Aardvark™ or NI USB-845x controller.

    Register address to write to on the I2C peripheral device, specified as a number. Refer to the peripheral device documentation or data sheet for more information about valid register addresses.

    Example: writeRegister(peripheral,1,data) writes to a register at address 1.

    Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64

    Data to write to the register of the I2C peripheral device, specified as a row (1-by-N) or column (N-by-1) vector of numeric values or as a character vector or string scalar of text.

    Example: writeRegister(peripheral,registerAddress,5) writes the value 5 to a register.

    Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char | string

    Size and format of each value, specified as a character vector or string. datatype determines the number of bytes to write for each value and the interpretation of those bytes as a MATLAB® data type. For ASCII text, you can specify datatype as "char".

    Example: writeRegister(peripheral,registerAddress,data,"uint32") writes data to a register as uint32.

    Data Types: char | string

    Version History

    Introduced in R2023a

    See Also

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