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interruptgpio

gpio pin is not exported in linux

I have tried the following to export the gpio in linux userspace:

  • In kernel config,

    Device Drivers --->
      --- GPIO Support
            [*] /sys/class/gpio/... (sysfs interface)

  • GPIO=9

    echo $GPIO >/sys/class/gpio/export

  • used gpio_export(9) in my code

  • tried to export all the gpio. But no gpio is exported.

What am I missing in exporting gpio pins in sysfs..?

Solution

  • Have you requested for the GPIO via "gpio_request"? A call to gpio_export should export the GPIO to the sysfs for control.