#code2 //create an instance of gpio41 //set direction as OUT //set value as 1 usleep(100000); //set value 0
Output : Toggle doesnt happens Whats this ? This is not code. At best it's comments, and usleep(). On Wed, Jul 13, 2016 at 9:02 PM, Raulp <imsaurabhra...@gmail.com> wrote: > OK let em explain a bit more : > #code 1 > sudo echo 41 > export > cd gpio41 > sudo chmod 666 direction > sudo chmod 666 value > sudo echo out > direction > sudo echo 1 > value > sleep 1 > sudo echo 0 > value > > Output : Toggle on the GPIO 41 > > > #code2 > //create an instance of gpio41 > //set direction as OUT > //set value as 1 > usleep(100000); > //set value 0 > > Output : Toggle doesnt happens > > > Now the output I am referring to is the functioning of the hardware I have > used.(ignore toggling , it happens anyway using the code#2) > > > Or does your code simply open, and use the file descriptors without any > error checking what so ever ? > >> I dont use error codes to check , but I have seen in the oscilloscope > that the signal transition is happening according to my code. > > -Rp > > > On Wednesday, July 13, 2016 at 8:52:30 PM UTC+5:30, William Hermans wrote: >> >> When I try to do the same using a user space C application I dont get the >>> expected response.I am running this app as sudo'er and I have >>> oscilloscope'd the timings of HIGH/LOW levels of the GPIOs and compared it >>> with that of the manually writing procedure of GPIOS. The waveform and the >>> timing diagrams almost matches (95%) >>> >> >> I'm not exactly sure what you saying here . . . However, in code are you >> actually checking for errors, and error codes. Or does your code simply >> open, and use the file descriptors without any error checking what so ever >> ? >> >> Seeing the code would probably help a lot. >> >> On Wed, Jul 13, 2016 at 2:41 AM, Raulp <imsaura...@gmail.com> wrote: >> >>> I have interfaced a hardware using the 5 Gpios on BBB.I can talk to this >>> device using GPIOs by manually (echoing 0 and 1 to the GPIOS) writing to it >>> in the sys/class/gpio directory by first exporting the Gpios and >>> configuring their directions and value.It works perfectly fine. >>> But, >>> When I try to do the same using a user space C application I dont get >>> the expected response.I am running this app as sudo'er and I have >>> oscilloscope'd the timings of HIGH/LOW levels of the GPIOs and compared it >>> with that of the manually writing procedure of GPIOS. The waveform and the >>> timing diagrams almost matches (95%) >>> So, >>> What could mysteriously be missing here.?I can go deep into analyzing >>> the wave-forms and timing diagrams as well if there is an issue in the >>> timings of the Signals. >>> Please advice.Thanks in advance ! >>> -Rp >>> >>> -- >>> 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. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/beagleboard/cb65b710-203e-4579-8c08-e2b817dc7a03%40googlegroups.com >>> <https://groups.google.com/d/msgid/beagleboard/cb65b710-203e-4579-8c08-e2b817dc7a03%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 beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/521956ed-983d-49b9-85f2-62e269dcf7fa%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/521956ed-983d-49b9-85f2-62e269dcf7fa%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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORpGnC6YmgO9-y9Z-W%2Bsd%3DysiYRiaNm5mRe-KLR6XBYJ%3DQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
