Re: [beagleboard] Tri-state GPIOs?
But, you have to watch the pullups and pull downs when you do that. Gerald On Tue, Aug 26, 2014 at 8:20 PM, John Syn john3...@gmail.com wrote: From: Gerald Coley ger...@beagleboard.org Reply-To: beagleboard@googlegroups.com beagleboard@googlegroups.com Date: Tuesday, August 26, 2014 at 1:06 PM To: beagleboard@googlegroups.com beagleboard@googlegroups.com Subject: Re: [beagleboard] Tri-state GPIOs? No. You can emulate tristate by changing GPIO outputs to GPIO inputs. Regards, John Gerald On Tue, Aug 26, 2014 at 4:36 AM, david.berge...@gmail.com wrote: Hey Guys Has the Beaglebone black *tri-state gpios*? When yes, how can I set up them? 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+unsubscr...@googlegroups.com. 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. 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. 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. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Tri-state GPIOs?
As a side note, you can also emulate open drain. Set the pin output state to 0, then enable/disable the output driver. And, for performance, writing to the gpio registers rather than doing file operations with sysfs is 30 times faster. And, pin muxing (pullups/down and input receiver enable for reading pin state) is separate from the gpio operations (output driver enable/disable, reading physical pin state, setting output driver level). On Wednesday, August 27, 2014 12:02:11 PM UTC-7, Gerald wrote: But, you have to watch the pullups and pull downs when you do that. Gerald On Tue, Aug 26, 2014 at 8:20 PM, John Syn john...@gmail.com javascript: wrote: From: Gerald Coley ger...@beagleboard.org javascript: Reply-To: beagl...@googlegroups.com javascript: beagl...@googlegroups.com javascript: Date: Tuesday, August 26, 2014 at 1:06 PM To: beagl...@googlegroups.com javascript: beagl...@googlegroups.com javascript: Subject: Re: [beagleboard] Tri-state GPIOs? No. You can emulate tristate by changing GPIO outputs to GPIO inputs. Regards, John Gerald On Tue, Aug 26, 2014 at 4:36 AM, david.b...@gmail.com javascript: wrote: Hey Guys Has the Beaglebone black *tri-state gpios*? When yes, how can I set up them? 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/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...@googlegroups.com javascript:. 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...@googlegroups.com javascript:. 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. For more options, visit https://groups.google.com/d/optout.
[beagleboard] Tri-state GPIOs?
Hey Guys Has the Beaglebone black *tri-state gpios*? When yes, how can I set up them? 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+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Tri-state GPIOs?
No. Gerald On Tue, Aug 26, 2014 at 4:36 AM, david.berge...@gmail.com wrote: Hey Guys Has the Beaglebone black *tri-state gpios*? When yes, how can I set up them? 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+unsubscr...@googlegroups.com. 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. For more options, visit https://groups.google.com/d/optout.
Re: [beagleboard] Tri-state GPIOs?
From: Gerald Coley ger...@beagleboard.org Reply-To: beagleboard@googlegroups.com beagleboard@googlegroups.com Date: Tuesday, August 26, 2014 at 1:06 PM To: beagleboard@googlegroups.com beagleboard@googlegroups.com Subject: Re: [beagleboard] Tri-state GPIOs? No. You can emulate tristate by changing GPIO outputs to GPIO inputs. Regards, John Gerald On Tue, Aug 26, 2014 at 4:36 AM, david.berge...@gmail.com wrote: Hey Guys Has the Beaglebone black tri-state gpios? When yes, how can I set up them? 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+unsubscr...@googlegroups.com. 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. 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. For more options, visit https://groups.google.com/d/optout.
