> Provided, you don't interfere with their settings during power up as they are also the boot pins.
He's saying you shouldn't interfere with their state at boot. No driving, pullup, or pull down on any of these pins (besides the those that configure the sysboot setting on the board). Relays wont flip, but there are 100k pullups on some of the pins, so they could be in a state you don't want. You could isolate these pins with something like a bilateral switch (or a Va = Vb type unidirectional level shifter) during boot. Attach the enable to 3v3_exp, and make sure whatever is on the world side of the isolator is in a known state when the pins are at high impedance (using pull ups or down). For any pins that you want to switch simultaneously (which requires memory writes), make sure they're in the same gpio bank. -Brandon On Sunday, March 2, 2014 2:04:25 PM UTC-8, Gerald wrote: > > As is indicated in the System Reference Manual, you can use the LCD pins > as GPIO pins. Provided, you don't interfere with their > settings during power up as they are also the boot pins. > > Gerald > > > > On Sun, Mar 2, 2014 at 1:32 PM, <mharr...@gmail.com <javascript:>> wrote: > >> Hi, >> >> I would like to configure BBB P8 with 16 (2 rows of 8) GPIO pins next to >> each other. They just need to be able to be set to high or low. I see P7 >> through P18 but I need 4 more. I am not using any LCD screen. Is it >> possible to reconfigure the pins? I am a BBB newbie and would appreciate >> any help so I don't mess anything up. >> >> Thanks >> >> -- >> 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...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- 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. For more options, visit https://groups.google.com/groups/opt_out.
