View source for Troubleshooting GPIs and GPOs

== Troubleshooting from the command line ==

'''Q:''' I just picked up a MeasurementComputing PCI-DIO24 card and am having trouble getting it setup.  I notice that in RDadmin when I define the new device in "Switchers GPIO" as Local GPIO as layed out in the GPIO.txt, the default device path is /dev/gpio0.  The problem is that /dev/gpio0 doesn't exist. 


'''A:''' The PCI-DI024 cards aren't supported in recent Linux Kernels, so it may not work for you.
If you have an old kernel: Sounds like you don't have the GPIO driver turned on.  You can get that from the Rivendell download page.  Install it, enable the 'gpio' service and you should then have a '/dev/gpio<n>' device node to correspond to each MC card in your system, along with entries in '/proc/driver/gpio/' to show you the status of each.

You can check these by opening a terminal and running the following to check if the gpio devices have been created:

 ls /dev/gpio*

This will return something like this:

 gpio0

To check the status of the device run the following in a terminal:

 ls /proc/driver/gpio/*

This will return something like this:

 card0

You can then run the following to see the status of card0:

 cat /proc/driver/gpio/card0

== Troubleshooting with GUI utility program RDGpiMon ==
See the [[RDGpiMon|wiki page about RDGpiMon]] for information about it.

== Other useful Wiki pages ==

[[GPIO.txt_-_GPIO_Notes_for_Rivendell]]