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