ADLINK Express-IB - Manual (Page 32)

Page 32 Express-IB
5. Embedded Functions
All embedded board functions on ADLINK’s Computer on Modules are supported at the operating system level using the ADLINK Intelligent
Device Interface (AIDI) library. The AIDI API programming interface is compatible and identical across all ADLINK Computer on Modules
and all supported operating systems. The AIDI library includes a demo program to demonstrate the library’s functionallity.
5.1. Watchdog Timer
The Express-HR implements a Watchdog timer that can be used to automatically detect software execution
problems or system hangs and reset the board if necessary. The Watchdog timer consists of a counter that
counts down from an initial value to zero. When the system is operating normally, the software that sets the
intial value periodically resets the counter so that the it never reaches zero. If the counter reaches zero before
the software resets it, the system is presumed to be malfunctioning and a reset signal is asserted.
The AIDI Library Watchdog functions support Watchdog control of the board. If the Watchdog begins countdown and reaches zero, it will
access the CPU's RESET signal to reset the system. This application must call another function named AidiWDogTrigger that triggers the
Watchdog to restart to prevent system reset.
5.1.1. AIDI Demo Program - Watchdog Tab
The AIDI Demo Program allows retrieval of the
current Watchdog status and updating of the
Watchdog settings
If the Watchdog is enabled, the user can click
the WDT Trigger button to manually reset the
counter and prevent the system from resetting