On Tue, 8 Sep 2015 13:43:24 -0700 (PDT), you wrote: >Hi, > >Did anybody find the cause for the restart? >My BBB has the same problem, my adapter is 5V 2A and there is definitely no >restart issue with USB power. >I'm running Debian 3.8.13-bone70.
>From what I remember, and I can be quite wrong, it goes something like this: USB power is monitored. With external 5V supply, the processor is fed, but the USB power input is still monitored. If it is read as being "absent" then the processor reboots due to a perceived power failure. The power monitor chip apparently decides that the USB (as in main power) has failed, shuts the processor down, detects that 5 volts is there, boots the processor back up. Some people made a shorting plug that simply shorts USB power to ground (in which case it was never "up" and is not checked). You could "ground" it through a 100 ohm resistor in a dummy plug, or perhaps a 1K resistor from USB VCC to ground. 100 ohms would draw 50 ma when installed on the board and then connected to VCC (10% drain), and 1K ohms would draw 5 ma (1% power), and might work just as well. Just what I seem to remember from the discussions. Harvey > >Thanks. > >On Thursday, March 13, 2014 at 8:27:17 PM UTC+5:30, [email protected] >wrote: >> >> Hi, >> >> I have noticed that the beaglebone black starts up after a shutdown. >> >> I have a C++ program running in the bbb, the bbb is backed by an external >> +5V battery pack. When the C++ program issues the following command to >> start the shutdown procedure of the bbb. >> >> system("shutdown -h now"); >>> >>> exit(0); >>> >>> >> This does shutdown the bbb completely sometimes, most times the bbb starts >> up again, the power led turns off but then after a second or two lights up >> again and then bbb starts up all over again (the output voltage from the >> power bank does not switch OFF, it remains ON for some time). >> >> In my previous bbb systems I have not faced this problem. >> >> It is my belief that the output voltage from the power bank has a sudden >> dip, this causes the bbb to detect a new power cycle. >> >> I am not sure though if I am correct... >> >> Could anyone enlighten me on this problem ??? >> >> I am sorry if the above problem sounds vague... >> >> thanks >> a >> >> -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
