Appendix A: Programming Watchdog Timer - Lanner HTCA-6400 User Manual

Hybrid tca platforms

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HTCA-6400 User Manual

APPENDIX A: PROGRAMMING WATCHDOG TIMER

A watchdog timer is a piece of hardware that can be used to automatically detect system anomalies and

reset the processor in case there are any problems. Generally speaking, a watchdog timer is based on a

counter that counts down from an initial value to zero. The software selects the counter's initial value and

periodically restarts it. Should the counter reach zero before the software restarts it, the software is resumed

to be malfunctioning and the processor's reset signal is asserted. Thus, the processor will be restarted as if

a human operator had cycled the power.

Watchdog Timer

Clock

To execute the utility: enter the number of seconds to start countdown before the system can be reset. Press

start to start the counter and stop to stop the counter.

wd_tst -swt xxx (Set Watchdog Timer 1-255 seconds)

wd_tst[*] -start (Start Watchdog Timer)

wd_tst -stop (Stop Watchdog Timer)

For a reference utility that contains sample code for watchdog function programming, please visit

http://www.lannerinc.com/support/download-center/drivers, enter the product category and download

the utility package.

Reset

Restart

Processor

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