writeRead

Write and read data from SPI device

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Syntax

data = writeRead(spidevObj,dataIn)
data = writeRead(spidevObj,dataIn,precision)

Description

data = writeRead(spidevObj,dataIn) returns the data, written to the SPI device specified as a device object.

example

data = writeRead(spidevObj,dataIn,precision) returns the data, written to the SPI device, based on the data precision.

Examples

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Create object for an SPI device that is already connected to SPI bus.

microbitObj = microbit('COM3');
spidev1 = device(microbitObj, 'SPIChipSelectPin', P16);
spidev1 =  
  device with properties: 

      SPIChipSelectPin: "P16" 
                SCLPin: "P13" 
               SDIPin: "P14" 
               SDOPin: "P15"

Use the SPI device object to write data to the SPI device.

writeCmd = bin2dec('0000 0010');
address = [255 0];
data = [250 155];
dataIn = [writeCmd address data];
out = writeRead(spidev1,dataIn)

out = 
			0 0 0 0 0

Read data from the SPI device.

readCmd = bin2dec('0000 0011');
dataIn = [readCmd address zeros(1,2)];
out = writeRead(spidev1,dataIn)

out = 
			0 0 0 250 155

Input Arguments

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Device connection to a SPI device, specified as a device object, connected to the SPI bus on the BBC micro:bit board. The SPI device object is created using the device function.

Data to read and write to the SPI device, specified as a scalar or vector. The range of the values in the array is based on the precision.

Data Types: double

Precision of data to read and write to the SPI device.

Version History

Introduced in R2017b

See Also