In < .com>
writes:
>Hello Friends,
>
>Objective : I'm working on a trivial solution for an issue like if my
>server/pc hangs at any moment it should reboot automatically.
>
>proposed Solution : I'll be using an external watchDog circuit[ckt].
>This ckt will be interfaced on LPT1's pin 16/14[as of my use] . There
>will be software 'C' program which will continually send 01010.. on the
>pin on LPT1 . Now ckt is made with a logic that it will observe the
>square wave ie 010101...on that pin. If there is square wave that means
>my PC is not in a hang/freeze possition.
>Now consider the phenomena that due to any reason PC crashes/hangs than
>the program prefarable binary generated from 'C' program will stop
>fuctioning. So it will either give continuous 1111.. or 0000.. . Now
>ckt will sense that there is no square wave / Pulse .. so it will give
>the reset pulse to PC which will reboot the machine .
>
>SINCE I'M VERY MUCH INTRESTED TO IMPLEMENT ASAP THIS. ANY COMMENTS FOR
>ABOVE WILL BE HELPFULL TO ME.
Unless this is a toy project of yours, be aware that watchdog cards for
PCs already exist.
If it is a toy project of yours, go on, but there is no standard way of
controlling the parallel port of a PC from a C program. It's probably
easier to generate a square wave on a serial port, if you configure it
for 8 data bits and 1 stop bit and send a continuous stream of 0x55
characters, but you can't do this in standard C, either.
Dan
--
Dan Pop
DESY Zeuthen, RZ group
Email:
Currently looking for a job in the European Union
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