writeDigitalPin - Write logical value to GPIO output pin - MATLAB (original) (raw)

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Write logical value to GPIO output pin

Since R2021b

Syntax

Description

writeDigitalPin([hwobj](#mw%5F643fbe6e-7b6f-4b90-bf05-8ae91ba395a1%5Fsep%5Fmw%5Fe4ef5c3f-193d-4700-99b9-936c8ea29966),[pinNumber](#mw%5F643fbe6e-7b6f-4b90-bf05-8ae91ba395a1%5Fsep%5Fmw%5Fd0264a27-682e-426b-b785-46d9a0f692df),[value](#mw%5F5a62a98d-deb7-415c-852a-88d272640c77)) sets the logical value of a GPIO pin to 0 or 1.

If the pin is not configured, this function configures the pin as a GPIO output.

If the pin is a GPIO input, or if another interface (I2C, Serial, SPI) uses the pin, this method returns an error message.

example

Examples

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Configure a GPIO pin as a digital output and write its logical value.

Create a connection from the MATLAB® software to the NVIDIA® Jetson™ board.

hwobj =

jetson with properties:

       DeviceAddress: 'jetson-board-name'
                Port: 22
           BoardName: 'NVIDIA Jetson TX2'
         CUDAVersion: '10.0'
        cuDNNVersion: '7.6'
     TensorRTVersion: '6.0'
          SDLVersion: '1.2'
         V4L2Version: '1.14.2-1'
    GStreamerVersion: '1.14.5'
       OpenCVVersion: '4.1.1'
             GPUInfo: [1x1 struct]
          WebcamList: []
AvailableDigitalPins: [7 11 12 13 15 16 18 19 21 22 23 24 29 31 32 33 35 36 37 38 40]

The AvailableDigitalPins property shows the list of available digital GPIO pins.

Show the location of the GPIO pins on your device.

Display the AvailableDigitalPins.

hwobj.AvailableDigitalPins

ans =

7 11 12 13 15 16 18 19
21 22 23 24 29 31 32 33
35 36 37 38 40

Connect your digital device to an available GPIO pin, for example GPIO 11.

Configure pin GPIO 11 as a digital output.

configurePin(hwobj,11,'DigitalOutput')

Write a logical value of 1 to pin GPIO 11.

writeDigitalPin(hwobj,11,1)

The logical value of 1 sets the signal voltage on pin GPIO 11 to high.

Input Arguments

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Connection to a specific NVIDIA hardware board, specified as a jetson object.

GPIO pin number, specified as a scalar. This argument does not accept vectors because the hardware cannot access multiple pins simultaneously.

To get a list of valid pin numbers, use the AvailableDigitalPins property of the jetson object. For example, _`hwobj`_.AvailableDigitalPins.

Example: 12

Data Types: double

Logical value of the pin, specified as a scalar.

Example: 1

Data Types: double | logical

Version History

Introduced in R2021b