Thanks, Graham. You are correct. I have already used these pins before, but for output purposes, so, I had no issues with that. But, since using as inputs, the switches are driving the pins and changing the SYSBOOT (aka LCDDATA) bus, which I had no idea that existed for my unfortunate surprise. I guess I'll have to redesign my boards including a tristate buffer.
Paulo Sherring. Em quarta-feira, 15 de novembro de 2017 16:59:03 UTC-3, Graham escreveu: > > You have apparently used two pins that conflict with the boot > configuration pins on the BBB, or the eMMC. > > Read the "BeagleBone Black System Reference Manual" (Version C.1), pages > 62, 63, 68, 82, 106, 107. > > --- Graham > > == > > On Wednesday, November 15, 2017 at 1:48:34 PM UTC-6, Paulo Sherring wrote: >> >> Hi, all. I have a beaglebone green connected to a custom cape. I am >> running the latest machinekit image. >> I have it all configured and runs mostly OK. I am having an issue with >> end switch circuitry. >> The switched are connected to P8_41 and P8_42 and are connected through >> the circuit in the attachment (BJT with open collector, connected through >> load resistor and internal pullup). If the end switch is opened, the board >> wont boot at all. If the end switch is closed, the board boots without any >> further issue. >> My question is: is there any blocking mechanism that prevents CPU from >> booting if, for example, any input is driver high? >> >> Thanks in advance! >> Paulo Sherring. >> > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/bd8bf279-556e-45e6-acf8-defd206c60ba%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
