read

Read data from I2C bus

Syntax

out = read(dev,numBytes)

out = read(dev,numBytes,precision)

Description

out = read(dev,numBytes) returns data read from the I2C bus based on the number of bytes.

out = read(dev,numBytes,precision) also specifies the data precision.

Examples

Read Data from an I2C Device on Arduino Hardware

Create an Arduino object and attach an I2C device object to it.

a = arduino();

Use an address to create the I2C device connection.

dev = device(a,'I2CAddress','0x55');

Read data from the I2C device.

out = read(dev,1)

out = 4

Specify Precision to Read Data from an I2C Device on Arduino Hardware

Create an Arduino object and attach an I2C device object to it.

a = arduino();

Use an address to create the I2C device connection.

dev = device(a,'I2CAddress','0x55');

Read data from the I2C device with the precision of uint16.

out = read(dev,1,'uint16')

out = 4

Input Arguments

dev — I2C device connection

device object

I2C device connection, specified as a device object.

numBytes — Number of bytes to read

scalar

Number of bytes of data to read from the I2C device, specified as a scalar.

precision — Data precision

'uint8' (default) | 'int8' | 'uint16' | 'int16' | 'uint32' | 'int32' | 'uint64' | 'int64'

Data precision, specified as one of the following character vectors:

• 'uint8'

• 'int8'

• 'uint16'

• 'int16'

• 'uint32'

• 'int32'

• 'uint64'

• 'int64'

Output Arguments

out — Value of data

scalar | vector

Value of data stored at the I2C device register, returned as a scalar or vector based on the precision .

More About

Code Generation Using MATLAB Function Block

• Use read in a MATLAB^® Function block with the Simulink^® Support Package for Arduino^® Hardware to generate code that can be deployed on Arduino Hardware.

Version History

Introduced in R2014b