Hi Jonathan, I modified my code to only read the ADC channels once a second, and it is still locking up the touch screen, although if takes longer now. Again, any insight on what might be happening would be appreciated. Regards, Greg > -----Original Message----- > From: linux-iio-owner@xxxxxxxxxxxxxxx > [mailto:linux-iio-owner@xxxxxxxxxxxxxxx] On Behalf Of Greg > Wilson-Lindberg > Sent: Friday, July 31, 2015 2:16 PM > To: linux-iio@xxxxxxxxxxxxxxx > Subject: BBB IIO ADC access not working > > Hi Jonathan, > To recap my current problems, we are using all 3 of the ADC > channels that are unused by the BBB for our system. One > channel has an analog mux on it to allow selecting between 2 > input pots. The other two channels are hooked up to pressure > transducers. > > I'm processing the channels in a routine that gets called > from a timer every 100ms. I enable the IIO buffer to collect > data and 100ms later read the samples and turn the buffer off > again. I leave the buffer off for 400 ms and then go through > the process again. I do this enable, read, disable cycle to > allow the touch screen enough time to gather data to properly > handle touch screen events. > > With this setup the system will work properly for a few > seconds, and then the buffer/adc read process slows down so > that it takes more than 2 seconds to process the two enable, > read, disable cycles in my read state machine. When the slow > down happens, the touch screen stops responding, and even > mouse presses stop working, although the mouse pointer did > continue to follow mouse movements and the screen continued > to update properly. > > Because of the size of the code I've posted it on pastebin: > http://pastebin.com/TDRS1nu7 instead of including it here. > > This is running on a Jessie debian system build from Robert > C. Nelson, based on the 3.18 kernel. > > I hope that you or someone else on the list can help me > understand what is going on. > > Greg Wilson-Lindberg > Sakura Finetek > 310-783-5075 > -- > To unsubscribe from this list: send the line "unsubscribe > linux-iio" in the body of a message to > majordomo@xxxxxxxxxxxxxxx More majordomo info at > http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
