Re: Getting alot of zero values from ads7846 using atmel_spi

2011-04-20 Thread Kenneth Heitke
On 04/20/2011 08:34 AM, Niclas Karlsson wrote: > tis 2011-04-19 klockan 14:40 -0600 skrev Kenneth Heitke: >> On 04/18/2011 03:21 AM, Niclas Karlsson wrote: >>> tor 2011-03-10 klockan 15:41 +0100 skrev David Lamparter: On Tue, Mar 08, 2011 at 10:44:56AM +0100, Niclas Karlsson wrote: > Do an

Re: Getting alot of zero values from ads7846 using atmel_spi

2011-04-20 Thread Niclas Karlsson
tis 2011-04-19 klockan 14:40 -0600 skrev Kenneth Heitke: > On 04/18/2011 03:21 AM, Niclas Karlsson wrote: > > tor 2011-03-10 klockan 15:41 +0100 skrev David Lamparter: > >> On Tue, Mar 08, 2011 at 10:44:56AM +0100, Niclas Karlsson wrote: > >>> Do anyone know why I read so many zeroes? > >> > >> You

Re: Getting alot of zero values from ads7846 using atmel_spi

2011-04-19 Thread Kenneth Heitke
On 04/18/2011 03:21 AM, Niclas Karlsson wrote: > tor 2011-03-10 klockan 15:41 +0100 skrev David Lamparter: >> On Tue, Mar 08, 2011 at 10:44:56AM +0100, Niclas Karlsson wrote: >>> Do anyone know why I read so many zeroes? >> >> You're probably reading values faster than the chip supports. Check the

Re: Getting alot of zero values from ads7846 using atmel_spi

2011-04-18 Thread Niclas Karlsson
tor 2011-03-10 klockan 15:41 +0100 skrev David Lamparter: > On Tue, Mar 08, 2011 at 10:44:56AM +0100, Niclas Karlsson wrote: > > Do anyone know why I read so many zeroes? > > You're probably reading values faster than the chip supports. Check the > chip documentation for a maximum readout frequenc

Re: Getting alot of zero values from ads7846 using atmel_spi

2011-03-10 Thread David Lamparter
On Tue, Mar 08, 2011 at 10:44:56AM +0100, Niclas Karlsson wrote: > Do anyone know why I read so many zeroes? You're probably reading values faster than the chip supports. Check the chip documentation for a maximum readout frequency or a ready flag. > I have made some printk in ads7846.c to trace

Getting alot of zero values from ads7846 using atmel_spi

2011-03-08 Thread Niclas Karlsson
Hi, I'm not sure this is the right mailinglist for my question, but I give it a shot. I'm working on a custom hardware running Linux kernel 2.6.32.3. The hardware is based on the AT91SAM9263-ek evaluation board and have touch screen attached to it. The touch screen controller is ads7846 and is con