Add a a battery or super CAP. When the DC voltage goes away, the processor gets and interrupt. When SW get interrupt unmount the Flash and power down. Invest in a real 5V power supply.
Gerlad On Mon, May 16, 2016 at 2:51 PM, Micka <mickamus...@gmail.com> wrote: > Gerald what is your opinion on this subject ? > > > Le lun. 16 mai 2016 21:46, evilwulfie <evilwul...@gmail.com> a écrit : > >> spend 50 bux on a power supply to solve a 5 dollar problem yeah right. >> >> >> >> On 5/16/2016 12:34 PM, John Syne wrote: >> >> >> On May 15, 2016, at 4:25 PM, evilwulfie < <evilwul...@gmail.com> >> evilwul...@gmail.com> wrote: >> >> msp430 has an internal watchdog >> >> And so does the AM3358, so I’m not sure whats your point? If it is a >> micro-controller, it is not guaranteed to boot up successfully every time, >> given an unstable power supply. To start with, you need to make the power >> supply more predictable so that brown outs, dips and sags are not seen by >> the micro-controller and that power down only occurs if the input power >> fails for more than a specified time. Also, if you do start a shutdown, >> then a full power cycle is needed in a controlled manner. When input power >> returns, don’t boot until the input power looks reliable. >> >> This is where you need an understanding of how the power utility network >> operates, which includes understanding how protection operates, what an ARC >> (Automatic Reclosure Relays) do, etc. For example, when a large breaker >> trips due to a protective signal, the ARC will attempt to reclose that >> breaker, sometimes more than once. At night, in a storm, you will see your >> lights dim for a second or two; that is an ARC operation. When a >> transformer has water in the oil or when a insulator is arching, or a power >> line is arching on the ground, these all result in very strange power >> behavior. In summary, power failure isn’t just an on or off problem, but a >> multitude of more problematic cases. >> >> Regards, >> John >> >> >> On 5/15/2016 3:37 PM, John Syne wrote: >> >> >> On May 15, 2016, at 3:14 PM, evilwulfie <evilwul...@gmail.com> wrote: >> >> We use an external msp430 for our intelligent watchdog >> >> So who or what monitors the MSP430? Since it is a micro-controller, it is >> easy to get it into a lock situation. All you need is a programable power >> supply which will ramp up and down the voltage into the micro-controller at >> predefined times and it will lock and become completely unresponsive. >> Granted this will rarely happen, but in our applications where 100K or more >> devices are installed, we cannot accept some devices locking up because of >> a power failure. >> >> Regards, >> John >> >> >> >> On 5/15/2016 1:07 PM, Super Twang wrote: >> >> >> >> I've just come across this conversation in my own search for a >> rock-solid, embeddable configuration for the BeagleBone Black. I’m trying >> to develop an embedded controller device that needs to live behind walls, >> in ceilings and in other inaccessible places. ( It is for the automation of >> art & other electronic installations.) >> >> From what I gather here, the BBB is not quite up to the task, without an >> external watchdog circuit (please correct me if I’m misreading this thread). >> >> @John3909: Your suggestion of the GreenPak prompted my own discovery of >> that tech — it looks great, esp the ecosystem of tools around the platform. >> >> In looking around, I found some Silego application notes that implement a >> hardware watchdog for MCUs. >> http://www.silego.com/products/352/312/AN-1058.html This might be a >> useful starting point for anyone using GreenPak for a hardware watchdog. >> >> @John3909: Does this design look like it might be a good fit for the BBB? >> (Not knowing how to read GreenPak internals, it is not obvious to me) >> >> Alternately, I'm wondering in the two years that have passed since this >> thread started, if anyone has developed a hardware watchdog design for the >> BBB they'd be willing to share. An open-source hardware watchdog for the >> BBB would go a long way towards ameliorating the hardware issues with the >> PMIC on RevC, and allow it to prosper as a base for applications where >> long-term reliability matters. >> >> Although I’m first and foremost a software engineer, I've got some >> electronics chops (albeit mostly digital), but (sadly) very limited >> hardware design equipment (oscilloscope, etc). [That said, I have iron, >> and will solder!] I’d be happy to develop & contribute the software >> components for such a system (I’d envision a library + device tree overlay) >> if someone(s) else would like to partner up to design the hardware side. >> >> Best, >> >> ST >> >> -- >> For more options, visit <http://beagleboard.org/discuss> >> http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to <beagleboard+unsubscr...@googlegroups.com> >> beagleboard+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> <https://groups.google.com/d/msgid/beagleboard/c7fb39d8-84ef-4127-9db8-cd65a6965e31%40googlegroups.com> >> https://groups.google.com/d/msgid/beagleboard/c7fb39d8-84ef-4127-9db8-cd65a6965e31%40googlegroups.com >> . >> For more options, visit <https://groups.google.com/d/optout> >> https://groups.google.com/d/optout. >> >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to <beagleboard+unsubscr...@googlegroups.com> >> beagleboard+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> <https://groups.google.com/d/msgid/beagleboard/976bd440-2729-5157-8692-3357a8d607a0%40gmail.com> >> https://groups.google.com/d/msgid/beagleboard/976bd440-2729-5157-8692-3357a8d607a0%40gmail.com >> . >> For more options, visit https://groups.google.com/d/optout. >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> <https://groups.google.com/d/msgid/beagleboard/E00049D5-E39B-42CB-8A5E-A19F4E51199F%40gmail.com> >> https://groups.google.com/d/msgid/beagleboard/E00049D5-E39B-42CB-8A5E-A19F4E51199F%40gmail.com >> . >> For more options, visit https://groups.google.com/d/optout. >> >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> <https://groups.google.com/d/msgid/beagleboard/300489a5-a027-8f30-a598-89be5b17b4a4%40gmail.com?utm_medium=email&utm_source=footer> >> https://groups.google.com/d/msgid/beagleboard/300489a5-a027-8f30-a598-89be5b17b4a4%40gmail.com >> . >> For more options, visit https://groups.google.com/d/optout. >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> <https://groups.google.com/d/msgid/beagleboard/7BFABDDC-D4D0-4E6F-863C-1015E9794658%40gmail.com?utm_medium=email&utm_source=footer> >> https://groups.google.com/d/msgid/beagleboard/7BFABDDC-D4D0-4E6F-863C-1015E9794658%40gmail.com >> . >> For more options, visit https://groups.google.com/d/optout. >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/4b8c4f6e-abae-446c-d964-26d37b92d4b3%40gmail.com >> <https://groups.google.com/d/msgid/beagleboard/4b8c4f6e-abae-446c-d964-26d37b92d4b3%40gmail.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > -- Gerald ger...@beagleboard.org http://beagleboard.org/ gcol...@emprodesign.com -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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