On 1/9/2019 11:13 AM, Gediminas Dirma wrote: > Hello > > I am trying to design input scheme for beaglebone that i will use with > machinekit. I add picture of scheme that i intend to use. But i am a bit > scared that during booting input from 3.3V rail could damage board. I think > i read somewhere that you can only input voltage to pin than beagle has > booted. So can i use this scheme or should i change it?
Assuming the pull-up resistor uses the 3.3V supply available on the P8/P9 headers you should be fine. It is unsafe to apply voltage to the I/O pins while the BeagleBone is not powered, but there is no requirement that the BeagleBone has to have "booted". The only potential issue you might have is if you use any of the HDMI I/O pins. These pins cannot be driven while the BeagleBone is in reset, as they are sampled at the rising edge of the reset signal and used to determine the boot mode (ie: if you change the pin state before the BeagleBone comes out of reset you may select an unsupported boot mode by accident). This is discussed in the Technical Reference Manual for the various BeagleBones: https://beagleboard.org/Support/Hardware+Support -- Charles Steinkuehler [email protected] -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout.
