Date: Fri, 2 Feb 1996 12:13:55 +1030 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: jgreco@brasil.moneng.mei.com (Joe Greco) Cc: jkh@time.cdrom.com, dgy@rtd.com, freebsd-hackers@freefall.freebsd.org Subject: Re: Watchdog timers (was: Re: Multi-Port Async Cards) Message-ID: <199602020143.MAA25721@genesis.atrad.adelaide.edu.au> In-Reply-To: <199602011630.KAA08895@brasil.moneng.mei.com> from "Joe Greco" at Feb 1, 96 10:30:11 am
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Joe Greco stands accused of saying: > > I get the feeling I was barking up the right tree to begin with, but just > didn't take it far enough. Take a PC card. Stick a microprocessor on it > with two serial ports. Connect a 16450 to the PC bus as COM1:, and hard > wire it to one of the uP's serial ports. You have "serial console" > capability within FreeBSD. Connect an output line from the uP to the PC's > reset line. And decode one or two I/O locations and make them available to > the uP. If you're going to decode the I/O's already, don't bother with the UART. I have a rough schematic for this already, and I'll work on it when I can; keep the ideas coming 8) > o See log of recent events (maybe a 10K buffer that saves FreeBSD's console > output and writes an appropriate marker if'n'when a watchdog RESET > happens, etc). 32/64K battery-backed SRAM at the moment. > Depending on the choice of uP and its I/O capabilities, one might > conceivably consider adding multiple point temperature monitoring and/or > voltage monitoring as well. 8 AD inputs; conditioning for various sensors is a problem though. > Joe Greco - Systems Administrator jgreco@ns.sol.net -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] "wherever you go, there you are" - Buckaroo Banzai [[
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