Appendix A
:
Programming the Watchdog Timer
Programming the 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 presumed 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
Driver Installation
Before you could access or control the operation of the
watchdog and Digital I/O functions, install the the IM_IO
driver which is the library and driver needed for the
Indumicro General Purpose Input/Output interface or
functions
To install the IM_IO driver:
Restart the computer, and then log on with
1
Administrator privilege
Insert the Driver DVD into the USB optical drive
2
Browse the contents of the DVD to locate the file
3
4
Click Next to proceed
5
Answer “Yes” to the question and select Next to
6
proceed
Select Add a new hardware device
7
IM
M
-
L30D
User Manual
2
IM_IO rar under the \Watchdog and DIO\IM_IO
folder and unzip the file
From the control panel, click the ADD Hardware
program
