Yes, and you can switch if you want with alternate modes using the pinmux subsystem
On Monday, January 12, 2015 at 1:48:04 PM UTC-8, AndyS wrote: > > I think I have grasped it now. You can set individual pins to different > mux modes? > > > > On Monday, January 12, 2015 at 7:11:37 PM UTC, Neabex wrote: >> >> Andy, there are two kinds of PRU GPIO writes, the direct ones, in which >> you write to the R30 register, and ones where you have to access the gpio >> subsystem, you only need to mux it to the PRU if you're doing the direct >> method. >> >> >> On Monday, January 12, 2015 at 9:07:17 AM UTC-8, AndyS wrote: >>> >>> Thank you for your quick replies. I will work through the examples this >>> evening. >>> >>> Ok. I think I might be getting a little confused of something called >>> mux mode5 which looks like it is specific to an example I have been >>> following on GPIO from Derek Molloy. >>> >>> Can I create my own overlays to configure the mux which uses both GPIO >>> and PRU IO? ( and the ADC if required) >>> >>> >>> >>> On Monday, January 12, 2015 at 4:57:19 PM UTC, Charles Steinkuehler >>> wrote: >>>> >>>> On 1/12/2015 5:11 AM, AndyS wrote: >>>> > Hello, >>>> > >>>> > I have an application which requires use of the PRU for some fast IO. >>>> I >>>> > need to use more IO than the PRU can handle, but some of the other IO >>>> only >>>> > needs to operate in slow time. >>>> > >>>> > Can I configure the BBB to use both PRU IO and Linux controlled GPIO. >>>> >>>> Yes. The PRU writes to GPIO pins are not particularly slow unless you >>>> saturate the interconnect, but the writes are posted and happen a while >>>> after the PRU executes them (apx. 100 nS later). Unless you need >>>> critical timings between the direct PRU outputs and the GPIO pins, this >>>> shouldn't be a problem. >>>> >>>> Reads from GPIO pins are another matter. Since it is not possible to >>>> post the reads, and the PRU (by design) doesn't execute instructions >>>> out >>>> of order or perform speculative execution, the PRU core stalls after >>>> issuing a read GPIO request until the data is returned from the >>>> interconnect fabric (apx. 165 nS). >>>> >>>> I have timing details in the comments of my PRU code for Machinekit: >>>> >>>> >>>> https://github.com/machinekit/machinekit/blob/master/src/hal/drivers/hal_pru_generic/pru_generic.p#L135-L163 >>>> >>>> >>>> -- >>>> Charles Steinkuehler >>>> cha...@steinkuehler.net >>>> >>> -- 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.
