Watchdog Programming - Lippert Cool SpaceRunner-LX800 Technical Manual

4.4 Watchdog Programming

Since the Watchdog is disabled in delivery status, it must be set up for proper use.
The Watchdog is an internal feature of the ITE8712 Super I/O. If the Watchdog is activated and the
timer is not set back within a programmed amount of time, the board does a system reset.
The mounted LEMT initialize a hardware reset and turns on the watchdog LED.
The following C program is an example how to test the Watchdog function. It is meant to be
compiled using gcc under Linux. For using the listed libraries the libc6 package should be installed.
#include <stdio.h>
#include <sys/io.h>
#include <unistd.h>
#define CONF_ADDR 0x2E
#define CONF_DATA 0x2F
int main()
{
unsigned char i;
iopl(3);
outb(0x87, CONF_ADDR); // sets SIO in configuration mode (fixed sequence:
outb(0x01, CONF_ADDR); // 0x87,0x01,0x55,0x55)
outb(0x55, CONF_ADDR);
outb(0x55, CONF_ADDR);
outb(0x07, CONF_ADDR); // LDN=0x07
outb(0x07, CONF_DATA);
outb(0x72, CONF_ADDR); // set time out value to seconds
outb(inb(CONF_DATA)|0x80, CONF_DATA);
outb(0x73, CONF_ADDR); //set time out:
outb(0x03, CONF_DATA); //0x03 -> 3 seconds
printf("Watchdog enabled. Press CTRL+C within 5 seconds to stop disarming.\n");
for(i=0; i<5; i++)
{
outb(0x73, CONF_ADDR); //reset time out
outb(0x03, CONF_DATA);
printf(".");
fflush(stdout);
sleep(1);
}
outb(0x73, CONF_ADDR);
outb(0x00, CONF_DATA); //deactivate watchdog
printf("\nWatchdog disabled\n");
iopl(0);
return 0;
}
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