Hi Michael, > -----Original Message----- > From: Michael Welling [mailto:mwelling79@xxxxxxxxx] On Behalf > Of Michael Welling > Sent: Wednesday, May 20, 2015 3:14 PM > To: Greg Wilson-Lindberg > Cc: linux-iio@xxxxxxxxxxxxxxx > Subject: Re: BBB touch screen and ADC interactions > > On Wed, May 20, 2015 at 02:54:35PM -0700, Greg Wilson-Lindberg wrote: > > Hi Michael, > > I've applied your patch and the mouse clicks now work > mostly, and I even saw one touch screen click that worked. > > > > This is not promising. Perhaps you are accessing the ADC to > quickly for it to be available for the touchscreen. I'm setting up a buffer of 1024 elements, and I'm currently reading it every second in my test code. There isn't any way that I see of changing the update frequency, would using a smaller buffer decrease the update rate? > > > I only need to read the ADC infrequently so I guess I'll > set it up to enable when I need to read the ADC and then > disable again. > > > > Do you know if I can set up the context, device and > channels and then just enable the channels, do the scan, and > then disable the channels until I need them again, without > tearing down the channels, device and context? > > > > I think you can just enable and disable the buffer. > > To disable: > echo 0 > /sys/bus/iio/devices/iio:device0/buffer/disable > or > http://lxr.free-electrons.com/source/drivers/staging/iio/Docum entation/generic_buffer.c#L337 > > To enable: > echo 1 > /sys/bus/iio/devices/iio:device0/buffer/enable > or > http://lxr.free-electrons.com/source/drivers/staging/iio/Docum entation/generic_buffer.c#L280 I'll try this and see if it works. -Greg > > > Regards, > > Greg > > > > > > > -----Original Message----- > > > From: Michael Welling [mailto:mwelling79@xxxxxxxxx] On Behalf Of > > > Michael Welling > > > Sent: Tuesday, May 19, 2015 5:35 PM > > > To: Greg Wilson-Lindberg > > > Cc: linux-iio@xxxxxxxxxxxxxxx > > > Subject: Re: BBB touch screen and ADC interactions > > > > > > On Tue, May 19, 2015 at 05:16:46PM -0700, Greg > Wilson-Lindberg wrote: > > > > > > > > I would be happy to test the patch, better than what I was > > > going to try. > > > > > > > > -Greg > > > > > > Below is the simple workaround patch that I used to eliminate the > > > repeated release events that were occurring without touching the > > > screen. > > > > > > See if it helps. > > > > > > diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c > > > b/drivers/input/touchscreen/ti_am335x_tsc.c > > > index 191a1b8..f876097 100644 > > > --- a/drivers/input/touchscreen/ti_am335x_tsc.c > > > +++ b/drivers/input/touchscreen/ti_am335x_tsc.c > > > @@ -281,13 +281,11 @@ static irqreturn_t titsc_irq(int > irq, void *dev) > > > if (status & IRQENB_PENUP) { > > > fsm = titsc_readl(ts_dev, REG_ADCFSM); > > > if (fsm == ADCFSM_STEPID) { > > > - ts_dev->pen_down = false; > > > input_report_key(input_dev, BTN_TOUCH, 0); > > > input_report_abs(input_dev, ABS_PRESSURE, 0); > > > input_sync(input_dev); > > > - } else { > > > - ts_dev->pen_down = true; > > > } > > > + ts_dev->pen_down = false; > > > irqclr |= IRQENB_PENUP; > > > } > > > > > > > -- 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
