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Original question:

Linux/AM5728: GPIO configuration

AM5728: GPIO Read

David Brooks
Prodigy 20 points

Part Number: AM5728

I am looking for examples of how to read GPIO pins from User Space using Linux SDK 5.0.015

HDMI Hot Plug has been routed to a GPIO pin and I want to setup a timer loop to read every few seconds and then signal the Qt application.  How do you read state of GPIO pins from a C program running in user space?

  • 0
    TI__Guru**** 167540 points

    Hi David,

    echo 'gpio_num' > /syc/class/gpio/export

    Then you can use:

    cat /sys/class/gpio/gpio'gpio_num'/direction
    cat /sys/class/gpio/gpio'gpio_num'/value

    Just replace the gpio_num with the gpio number that you want to observe.

    Best Regards,
    Keerthy