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 <javascript:> > > 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 <javascript:>. >> 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. For more options, visit https://groups.google.com/d/optout.
