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 connected to SPI. I'm in some trouble using the SPI (driver: atmel_spi). ads7846 have two extra inputs that I want to use. The problem is that when reading these inputs from sysfs I get a lot of zeroes when it should read ( when no sensor is connected) ~3300 mV, e.g. ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 ~# cat /sys/bus/spi/devices/spi0.1/in0_input 3299 <-- This one is correct. ~# cat /sys/bus/spi/devices/spi0.1/in0_input 0 I have measured the input and it's stable at 3.3V. Do anyone know why I read so many zeroes? I have made some printk in ads7846.c to trace the problem. It seemed to read more correct values when I added the printks. Thank you for the help, Niclas ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
