> > Robert, > > What do you need or want to use the PRUs for ? These pins you're talking > about are probably shared with the HDMI pins, but are not the only pins the > PRU have access to. These pins are probably the pins the single cycle(5ms) > access to > , where the PRU's can access any pin on the board, just not with single > cycle access. More like 3+ cycles if memory serves correctly. > > My answers this morning did not include this earlier because I was not > quite awake yet. . .
Put more acurately. - The pins you're asking about are shared with the header pins for the HDMI framer. - Your LCD uses HDMI, so in order to use those pins, you would have to disable HDMI. - The PRUs can access any GPIO pin on the board, but the ones shared with HDMI( and a few others ) can be accessed by the PRU in a single PRU cycle - 5ms. - The rest of the pins can still be accesses by the PRU's, just with a higher access latency. 3-5 cycles if I remember right. So to solve this problem of yours, you have some options. Disable the HDMI pins, and re-enable for PRU GPIO access, for full speed GPIO, or use different pins and access the pin slower . . .Or perhaps the remaining single cycle access pins raming for PRU0 / PRU1 are enough for what you need ? So again, I ask. WHat ddo you need the PRU's for ? ;) On Fri, May 6, 2016 at 12:58 PM, William Hermans <[email protected]> wrote: > Robert, > > What do you need or want to use the PRUs for ? These pins you're talking > about are probably shared with the HDMI pins, but are not the only pins the > PRU have access to. These pins are probably the pins the single cycle(5ms) > access to > , where the PRU's can access any pin on the board, just not with single > cycle access. More like 3+ cycles if memory serves correctly. > > My answers this morning did not include this earlier because I was not > quite awake yet. . . > > On Fri, May 6, 2016 at 12:53 PM, Robert Jonathan Šimon < > [email protected]> wrote: > >> I have another Question on PRUs. It has 9 pins for first PRU and 15 pins >> for the second PRU (according to this schematic >> <http://beagleboard.org/support/bone101/#headers-pru>). Is there any >> option to expand number of pins, which I cand use by the PRUs? >> >> Dne pátek 6. května 2016 18:25:14 UTC+2 Robert Jonathan Šimon napsal(a): >> >>> Ok. Great. Thanks for your time. >>> >>> Dne pátek 6. května 2016 18:21:47 UTC+2 William Hermans napsal(a): >>>> >>>> Better yet, I'll tell you what's better to do. Contact the manufacturer >>>> of that screen, and ask what you're options are. >>>> >>>> If you're lucky, it could be possible to rewrite the device tree >>>> overlay file for that screen to work using alternate pins. >>>> >>>> If you're unlucky, you'll have to buy a different kind of screen. >>>> >>>> On Fri, May 6, 2016 at 9:18 AM, Robert Jonathan Šimon < >>>> [email protected]> wrote: >>>> >>>>> Sorry, i send the wrong link. On this link >>>>> <https://www.soselectronic.cz/productdata/15/37/24/153724/4DCAPE-70T_datasheet_R_1_2.pdf>, >>>>> there is a picture, where you can see precisely which pin it is using >>>>> >>>>> Dne pátek 6. května 2016 18:12:17 UTC+2 William Hermans napsal(a): >>>>>> >>>>>> Ok, so, I do not have time to read through all the literature for >>>>>> that screen. Which pins does it use, what is the specific function of >>>>>> each >>>>>> pin, and what "protocol" does the screen use ? >>>>>> >>>>>> Is it one of those modified 9pin SPI + GPIO screens ? >>>>>> >>>>>> On Fri, May 6, 2016 at 9:02 AM, Robert Jonathan Šimon < >>>>>> [email protected]> wrote: >>>>>> >>>>>>> I have this LCD screen >>>>>>> <https://www.soselectronic.cz/products/4dcape-70t#tabs-6> and it >>>>>>> user most of the second PRU pins and one of the first PRU unit. I am not >>>>>>> sure, if this is problem or not. >>>>>>> >>>>>>> Dne pátek 6. května 2016 17:59:11 UTC+2 William Hermans napsal(a): >>>>>>>> >>>>>>>> *Hi,* >>>>>>>>> *I am starting to play with PRU on BBB, and I noticed, that when I >>>>>>>>> want to use PRU on BBB and on the same time use LCD display through >>>>>>>>> GPIO, i >>>>>>>>> cant (they use the same pins). Is there any workarounds?* >>>>>>>>> >>>>>>>> *Thanks a lot* >>>>>>>> >>>>>>>> I suppose that depends on how far you're willing to go, and changes >>>>>>>> you're willing to make. You can buy a different LCD screen, and perhaps >>>>>>>> even type of screen that uses different peripherals. >>>>>>>> >>>>>>>> But you can start by telling us which LCD screen you're using, and >>>>>>>> being more verbose as to how this LCD is connected. exactly which pins >>>>>>>> are >>>>>>>> required, etc. >>>>>>>> >>>>>>>> >>>>>>>> On Fri, May 6, 2016 at 8:41 AM, Robert Jonathan Šimon < >>>>>>>> [email protected]> wrote: >>>>>>>> >>>>>>>>> Hi, >>>>>>>>> I am starting to play with PRU on BBB, and I noticed, that when I >>>>>>>>> want to use PRU on BBB and on the same time use LCD display through >>>>>>>>> GPIO, i >>>>>>>>> cant (they use the same pins). Is there any workarounds? >>>>>>>>> Thanks a lot >>>>>>>>> >>>>>>>>> -- >>>>>>>>> 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/05e300cd-e354-41fc-9247-c145f95c1bbe%40googlegroups.com >>>>>>>>> <https://groups.google.com/d/msgid/beagleboard/05e300cd-e354-41fc-9247-c145f95c1bbe%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>>> . >>>>>>>>> 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 [email protected]. >>>>>>> To view this discussion on the web visit >>>>>>> https://groups.google.com/d/msgid/beagleboard/00bd2619-13de-4e34-bfb1-bd41f2af0d20%40googlegroups.com >>>>>>> <https://groups.google.com/d/msgid/beagleboard/00bd2619-13de-4e34-bfb1-bd41f2af0d20%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>> . >>>>>>> >>>>>>> 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 [email protected]. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/beagleboard/fd49e6fe-7b82-4f36-b16e-59a81df93f82%40googlegroups.com >>>>> <https://groups.google.com/d/msgid/beagleboard/fd49e6fe-7b82-4f36-b16e-59a81df93f82%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>>> 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 [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/a104b829-d942-4d82-a7c4-ef8f83dbd6a0%40googlegroups.com >> <https://groups.google.com/d/msgid/beagleboard/a104b829-d942-4d82-a7c4-ef8f83dbd6a0%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORpeap4ZLkohL9ay84B5dZbLi2TRBkmR9f1Rmmfjv5O8Hg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
