OT - Electronics / Computer question

[Rick C]

On Thursday, March 26, 2020 at 11:10:17 PM UTC-4, Tom Del Rosso wrote:

mpm wrote:

It's a complex box. There are something like (30) different things
that power-up. The problem is a particular module has a nasty
tendency to glitch (with "improper power-up/down") but could
(allegedly) be completely eliminated if we can guarantee the NUC is
fully booted before all the shit happens in the box.

Sorry, it isn't 100% clear if the power controller is the NUC or
separate, or if you have access to run your own code on the NUC. (Maybe
it was clear to everyone but me.)


That said, we did discuss the idea of using an LMC567 tone decoder
and the speaker-out from the NUC. It's kudgey as all hell, but might
work a little better (i.e., less wasted time) than the timer
approach. IDK.

Relying on the Windows sound theme doesn't seem too reliable.

I still haven't seen the definition of "booted" yet. That would seem to be a fairly important part of this.

One way to make sure the NUC is booted is for it to control power to everything else so it has to boot before anything else even turns on... for some values of "NUC is booted".

--

Rick C.

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[Tom Del Rosso]

mpm wrote:

It's a complex box. There are something like (30) different things
that power-up. The problem is a particular module has a nasty
tendency to glitch (with "improper power-up/down") but could
(allegedly) be completely eliminated if we can guarantee the NUC is
fully booted before all the shit happens in the box.

Sorry, it isn't 100% clear if the power controller is the NUC or
separate, or if you have access to run your own code on the NUC. (Maybe
it was clear to everyone but me.)

That said, we did discuss the idea of using an LMC567 tone decoder
and the speaker-out from the NUC. It's kudgey as all hell, but might
work a little better (i.e., less wasted time) than the timer
approach. IDK.

Relying on the Windows sound theme doesn't seem too reliable.

 

[Jasen Betts]

On 2020-03-25, mpm <mpmillard@aol.com> wrote:

Is there a way to tell when a NUC computer has finished booting?
I need to externally control some hardware power-up's (by 3rd parties so I don't have much control.) The NUC has to be up and running before I can power-up some things it will be controlling.

I could make a timer doo-dad, but there may be unforeseen issues with that approach.

Ideally, something I could run (Linux or Windows), or better yet, some sort of HARDWARE indication that the boot is complete.

Probably something simple I'm missing??
Logic state switch is better than intercepting USB or LAN packets or some crap like that.

Plug a UART bridge into one of the USB ports and send some message
over that upon booting

on linux

sleep 0.1 < /dev/ttyUSB0

Will put a 100ms pulse on the RTS and DTR pins.


--
Jasen.

 

[Jasen Betts]

On 2020-03-25, John Larkin <jlarkin@highland_atwork_technology.com> wrote:

On Wed, 25 Mar 2020 12:04:47 -0700 (PDT), mpm <mpmillard@aol.com
wrote:

Is there a way to tell when a NUC computer has finished booting?
I need to externally control some hardware power-up's (by 3rd parties so I don't have much control.) The NUC has to be up and running before I can power-up some things it will be controlling.

I could make a timer doo-dad, but there may be unforeseen issues with that approach.

Ideally, something I could run (Linux or Windows), or better yet, some sort of HARDWARE indication that the boot is complete.

Probably something simple I'm missing??
Logic state switch is better than intercepting USB or LAN packets or some crap like that.

Maybe put a little program, or even a little command line, to set a
pin on an RS232 or printer port or USB device at boot time. There a
folder in Windows where you can put stuff to kick off at boot time.

What sorts of ports does the NUC have?

Externally USB and HDMI/DisplayPort, Ethernet, and maybe analog audio,
internally SATA, M.2 and other PCIe variants, (often) Serial
port header, and SMB if you know where to solder.

--
Jasen.

 

Jasen Betts <jasen@xnet.co.nz> wrote in
news:r5sefn$cgj$2@gonzo.revmaps.no-ip.org:

On 2020-03-25, mpm <mpmillard@aol.com> wrote:
Is there a way to tell when a NUC computer has finished booting?
I need to externally control some hardware power-up's (by 3rd
parties so I don't have much control.) The NUC has to be up and
running before I can power-up some things it will be controlling.

I could make a timer doo-dad, but there may be unforeseen issues
with that approach.

Ideally, something I could run (Linux or Windows), or better yet,
some sort of HARDWARE indication that the boot is complete.

Probably something simple I'm missing??
Logic state switch is better than intercepting USB or LAN packets
or some crap like that.


Plug a UART bridge into one of the USB ports and send some message
over that upon booting

on linux

sleep 0.1 < /dev/ttyUSB0

Will put a 100ms pulse on the RTS and DTR pins.

Putty?