Write and read binary data from SPI instrument
A = writeAndRead(OBJ, dataToWrite)
A = writeAndRead(OBJ, dataToWrite) writes the data,
dataToWrite, to the instrument connected to interface object
OBJ and reads the data available from the instrument as a result of writing
dataToWrite. OBJ must be a 1-by-1 SPI interface object.
Values are written and read as
The interface object must be connected to the device using the
connect function before any data can be read from the device,
otherwise an error is returned. A connected interface object has a
ConnectionStatus property value of
SPI protocol operates in full duplex mode, so input and output data transfers happen simultaneously. For every byte written to the device, a byte is read back from the device.
To get a list of options you can use on a function, press the Tab key after entering a function on the MATLAB® command line. The list expands, and you can scroll to choose a property or value. For information about using this advanced tab completion feature, see Using Tab Completion for Functions.
This example shows how to create a SPI object
s, and read and
spi object called
s = spi('aardvark', 0, 0);
Connect to the chip.
Read and write to the chip.
dataToWrite = [2 0 0 255] data = writeAndRead(s, dataToWrite);
Disconnect the SPI device and clean up by clearing the object.