Hi, Thanks for the reply, I gave this a try and I can see that indeed it does go into a low power state, however it will not wake.
These are the commands I entered for reference: debian@beaglebone:~$ sudo su [sudo] password for debian: Sorry, try again. [sudo] password for debian: root@beaglebone:/home/debian# echo 0 > /sys/class/rtc/rtc0/wakealarm root@beaglebone:/home/debian# echo `date '+%s' -d '+ 1 minutes'` > /sys/class/rtc/rtc0/wakealarm root@beaglebone:/home/debian# echo standby > /sys/power/state Is there a way to trace whats going on? What would I look for? Thanks for your help! On Wed, Mar 28, 2018 at 12:05 PM, Neil Hancock <neilhanc...@gmail.com> wrote: > Hello Evan > I've done it and designing a cape that manages the power by turning it > off and on under external RTC control. > I've found this works > $ sudo su > $ echo 0 > /sys/class/rtc/rtc0/wakealarm > $ echo `date '+%s' -d '+ 1 minutes'` > /sys/class/rtc/rtc0/wakealarm > $echo standby > /sys/power/state > > shutsdown to 20mA then wakesup on deadline or any other event… > > > > > On Fri, Mar 23, 2018 at 11:32 AM, Evan Griffith <griffith.e...@gmail.com> > wrote: > >> >> Hi, >> >> I am trying to get some clarity on the capabilities of the RTC on the >> BBBW. Based on what I can see there is a nonbattery support powered RTC on >> the chip. However in poking around online I hav ebeen unable to issue a >> command that allows me to put the BBBW into a lower power state and then >> wake up using the RTC. For context what I am hoping to do is sleep for >> 10-20 minutes wakeup do something and then go back to sleep so that I can >> minimize power usage in a battery powered application. Also I am running >> the latest Debian stock OS with kernel 4.9.59-ti-rt-r74. >> >> thanks in advance for any help and let me know what info I should have >> provided to get better help. >> >> -- >> 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/ms >> gid/beagleboard/eb7d932f-775a-4d00-935a-a7df981d040d%40googlegroups.com >> <https://groups.google.com/d/msgid/beagleboard/eb7d932f-775a-4d00-935a-a7df981d040d%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> 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 a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/beagleboard/RZfu2sd0wbU/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/CAE_cRSfTP36rnA45xcx_5MKeED33xa1% > 2BmTAzAsJn-GK%3DDCw7Eg%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CAE_cRSfTP36rnA45xcx_5MKeED33xa1%2BmTAzAsJn-GK%3DDCw7Eg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > 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/CA%2BUXKCop_bf2U_DfaOx8YmnWY%2Bdvoi11beLc5gZu1JWvhdiT-A%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
