Hi Michael, > -----Original Message----- > From: Michael Welling [mailto:mwelling79@xxxxxxxxx] On Behalf > Of mwelling@xxxxxxxx > Sent: Tuesday, May 19, 2015 5:14 PM > To: Greg Wilson-Lindberg > Cc: linux-iio@xxxxxxxxxxxxxxx > Subject: RE: BBB touch screen and ADC interactions > > > > On May 19, 2015 6:56:37 PM CDT, Greg Wilson-Lindberg > <GWilson@xxxxxxxxxxxx> wrote: > >Hi Michael, > > > >> -----Original Message----- > >> From: Michael Welling [mailto:mwelling79@xxxxxxxxx] On Behalf Of > >> Michael Welling > >> Sent: Tuesday, May 19, 2015 4:30 PM > >> To: Greg Wilson-Lindberg > >> Cc: linux-iio@xxxxxxxxxxxxxxx > >> Subject: Re: BBB touch screen and ADC interactions > >> > >> On Thu, May 14, 2015 at 10:00:14AM -0700, Greg > Wilson-Lindberg wrote: > >> > > >> > I'll try out a new (4.0 - 4.1) kernel, but we are using QT > >> to generate a GUI and I don't know if the graphics that we > need have > >> been ported to the mainline yet. I guess I'll find out > the hard way. > >> > > >> > >> Have you had any luck getting the new kernel to work? > >> > >> I would like to know if you are experiencing the unexpected > >> release events that I experienced with the touchscreen. > >> > > > >I just got the 4.1 kernel working today. Our application is running > >just fine, so all of the QT stuff is working. > > > >I found that when running my IIO ADC read program on the 4.1 kernel, > >not only do I lose the touch screen, but mouse clicks stop > working, and > >the cursor periodically jumps. > > This seems to be the same issue that I was experiencing. > > I can forward the workaround patch when I get back to my PC. > > > > >I also figured out that I wasn't disabling the channels when my ADC > >program exited. When I got it to properly exit and disable > the IIO ADC > >channels, the mouse started working again. > > > >I then booted back to a 3.14 kernel and while the touch screen stops > >working while I am reading the ADC channels, the mouse still works > >normally, and the touch screen starts working again when the IIO > >program exits. > > > >It appears, for me at least, that the 4.1 kernel is not an > improvement. > > > >I don't need fast reads on the ADC, I may be able to get away with > >enabling the ADC channels, reading some values, and disabling them > >again every once in a while. I guess I'll have to try that. > > I have been working on a qt demo that reads the adc and > displays a graph while the touchscreen is enabled. The > workaround patch must be necessary. > > Would you like to the workaround patch? I would be happy to test the patch, better than what I was going to try. -Greg > > We can make a formal patch if it works for you. > > > > >- Greg > > > >> -Michael > >> > >> > Thanks for the information, > >> > > >> > Greg > >> > > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. > -- 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
