December 2005
Intermediate to advanced
432 pages
12h 32m
English
Content preview from Embedded Linux System Design and Development
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Embedded Drivers 161
5.5 Watchdog Timer
Watchdog timers are hardware components that are used to help the system
recover from software anomalies by resetting the processor. A watchdog timer
needs to be primed with a counter and the watchdog starts counting down
from the primed value to zero. If the counter reaches zero before the software
reprimes it, then it is presumed that the system is malfunctioning and system
reset is required. Some watchdog timers have advanced support built in them
such as monitoring temperature and power over voltage.
Typically watchdog timers provide four sets of operations.
Starting the watchdog
Setting watchdog timeout
Stopping the watchdog
Repriming the watchdog
In Linux, the watchdog is exported as a character device ...
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