**** BEGIN LOGGING AT Sat Feb 18 03:00:01 2017 Feb 18 13:13:30 hello all Feb 18 16:14:02 creetings Feb 18 16:14:08 I mean greetings ... Feb 18 16:14:52 So anyone have a thought on how to sync the BBB HDMI output to another source? Seems like something one could use the PRU for. Feb 18 16:18:58 GenTooMan: like use PRU to bitbang HDMI signals ? Feb 18 16:24:49 huh? Feb 18 17:41:37 GenTooMan: the "another source" is too vaguely specified, but sure you could make a control loop that fiddles with the display PLL to track some other clock source Feb 18 17:43:19 GenTooMan: it might be useful that PRUSS can optionally be clocked by the display PLL Feb 18 17:51:07 (provided that pixelclock <= 100 MHz) Feb 18 18:08:09 that might not even be needed though, it sounds fairly straightforward to measure phase error (i.e. the time between active edges of reference vsync and output vsync), filter it, and use it to adjust the display PLL frequency Feb 18 18:09:41 (figuring out suitable filtering is left as exercise to the reader :P might need some experimentation) Feb 18 18:18:53 perhaps even more convenient would be to get the two vsync signals timestamped on the IEP counter directly... I've gotten some impression that that should actually be possible if you connect them to edc_latch0 and edc_latch1, but that part of PRUSS still has very little public docs Feb 18 18:24:23 or use two eCAP instances to timestamp both vsync signals, or maybe even connect them to the inputs of an eQEP to (ab)use that as phase comparator... really there are a ton of options Feb 18 18:25:50 merely polling the inputs via PRU GPIO would also work fine Feb 18 18:26:03 ok, afk Feb 18 21:12:45 Hello people. I have a question regarding the beaglebone black. Is anyone available now? Feb 18 21:13:59 don't ask to ask. just ask. Feb 18 21:16:17 Does beaglebone have some sort of switch that turns off 5V power rail when battery almost ran out? Feb 18 21:18:35 steven__: the power management IC will shut down the system when input power drops below 3.5 V Feb 18 21:19:02 (and refuse to power up unless it is at least 4.3 V) Feb 18 21:20:08 Is it possible for 5V battery to provide less than 4.3V if the battery is almost drained? Feb 18 21:20:47 (although you'll start having problems sooner than that, e.g. the usb host port expects 5V) Feb 18 21:20:54 I've never heard of a 5V battery Feb 18 21:21:05 what kind of battery is it specifically? Feb 18 21:21:22 It's just one of commercial battery. Feb 18 21:21:25 rechargeable Feb 18 21:22:50 that doesn't answer my question at all. The behaviour of a battery very much depends on its chemistry. 5v is not a standard voltage level for any type of battery, so I'm wondering if it's perhaps a battery pack with integrated dcdc converter Feb 18 21:23:29 I haven't looked into that yet. Feb 18 21:23:43 I will take a look and come back later. Feb 18 21:23:53 Thanks for your help by the way. :) Feb 18 21:24:37 you're welcome Feb 18 21:25:05 keep in mind the beaglebone is designed to run off a regulated 5V supply Feb 18 21:26:43 so using a battery directly may cause complications as its voltage will change depending on how full it is Feb 18 21:27:08 but like I said, 5v is a strange voltage for a battery, I'd suspect it may be a battery pack with integrated electronics Feb 18 21:27:23 Okay. Feb 18 21:27:25 (designed to specifically power 5v electronics) Feb 18 21:28:18 So how would you power beaglebone as a portable device more stable? Feb 18 21:29:41 it's fine to use a battery pack for this purpose, just verify its specs are compatible with the beaglebone, i.e. 4.5-5.5 V output at a sufficient amount of current Feb 18 21:30:46 Ok. Feb 18 21:31:25 it's also possible to directly attach a li-ion/lipo cell to the beaglebone (the power management IC has an integrated charger for those), but that's much trickier and some soldering required (to place the battery header and to patch a hardware problem when using bbb in this way) Feb 18 21:32:04 in that case the "sys_5v" would be much lower than 5v though, hence usb host port will not work Feb 18 21:32:37 ok. but i need 5v to be supplied from beaglebone to beagle cape. Feb 18 21:34:00 thanks for a suggestion :) Feb 19 00:10:21 hi Feb 19 00:10:50 any hint where to get this file wilink8-wl18xx-r8.a8.08.tgz ? **** ENDING LOGGING AT Sun Feb 19 03:00:01 2017