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12
Trouble shooting
Since the OPN doesn't have a display, it also doesn't have a system menu to resort to when
you've installed a crashing application that prevents you from loading new software on the
OPN200x.
For this reason the OPN200x has a few escape mechanisms to allow you to restart, halt
your application and/or install new software. This can be very useful in case the OPN200x
has crashed or is constantly restarting due to a crashing application.
12.1
Restart mechanisms
Automatic
The OPN has a watchdog timer to determine whether the OS is still running or
has crashed. This watchdog will cause the OPN to restart after 3 seconds if the
OS has crashed. This watchdog timer will not cause a restart when only the
application has crashed.
Manually
The OPN has a manual restart mechanism that allows you to restart in
situations that the OS is still running, but your the application has crashed. In
order to activate this mechanism, press and hold the trigger or delete key for
at least 20 seconds. After the OPN has sounded the restart beep, you can
release the key to complete the restart.
Note: on the OPN2004, you must push both the trigger and clear key to halt
the device. After the beep, if you release the trigger key, the application will
be halted, and you can reload it with Appload. If you release the clear key,
the OS will be halted, and you can reload it with Appload.
12.2
Halting your application
•
Firstly, make sure your battery isn't empty and your mini-‐USB cable is not
connected to the OPN.
•
Then restart your application using one of the two restart methods listed above,
while keeping the trigger key pressed.
•
While keeping the trigger key pressed, insert the mini-‐USB cable into the OPN to
halt the application.
If successful, the LED of your OPN should now be blinking orange. You should now be able to
load new application or OS software.
Summary of Contents for OPN2002
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