Create a connection from the MATLAB^®software to the BeagleBone^®黑色的硬件。

bbb = beaglebone

bbb = beaglebone with properties: DeviceAddress: '192.168.7.2' BoardName: 'BeagleBone Black Rev 00C0' AvailableLEDs: {'USR0' 'USR1' 'USR2' 'USR3'} AvailableDigitalPins: {1x29 cell} AvailableAnalogPins: {'AIN0' 'AIN1' 'AIN2' 'AIN3' 'AIN4' 'AIN5' 'AIN6'} AvailablePWMPins: {} AvailableSPIChannels: {} AvailableI2CBuses: {'i2c-1'} AvailableSerialPorts: {} AvailableWebcams: {}

Enable I2C bus1.

enableI2C(bbb,1)

DisplayAvailableI2CBuses.

bbb.AvailableI2CBuses

ans = 'i2c-1' 'i2c-2'

AvailableI2CBusesdisplays default bus2asi2c-1. The1is an internal index number. When you enable bus1,AvailableI2CBusesdisplays it asi2c-2.

After physically connecting your I2C device to the I2C bus1pins, get the addresses of two I2C devices attached to I2C bus1.

scanI2CBus(bbb,“i2c-2”)

ans = {'0x55','0x20'}

Create a connection,i2csensor, from the MATLAB software to the I2C sensor at'0x20'.

i2csensor = i2cdev(bbb,“i2c-2”,'0x20')

i2csensor = I2C with Properties: Bus: i2c-2 I2CAddress: 0x20 TimeOut: 10

Read twouint8numbers from the sensor.

output1 = read(i2csensor,2);

Read the value of register 14 from the sensor.

output2 = readRegister(i2csensor,14);

Create a connection,i2cdisplay, from the MATLAB software to an I2C LED display at'0x55'.

i2cdisplay = i2cdev(bbb,“i2c-2”,'0x55')

i2cdisplay = I2C with Properties: Bus: i2c-2 I2CAddress: 0x55 TimeOut: 10

Write characters to the display.

write(i2cdisplay,[hex2dec('20') hex2dec('51')])

Write a scalar hexadecimal value,hex2dec('08'), to register 3 on an I2C device.uint8is the default data type.

writeRegister(i2cdisplay,3,hex2dec('08'))