Write and read binary data from SPI instrument
A = writeAndRead(OBJ, dataToWrite)
A = writeAndRead(OBJ, dataToWrite) writes
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. By default,
The interface object must be connected to the device using the
before any data can be read from the device, otherwise an error is
returned. A connected interface object has a
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.
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This example shows how to create a SPI object
and read and write data.
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.