On Wed, Aug 19, 2015 at 02:13:10PM -0700, Greg Wilson-Lindberg wrote: > > I'm not using /sys/bus/iio/devices/iio:device0/in_voltageX_raw in my program, > I'm using the iio buffer system. > > I tried using cat /sys/bus/iio/devices/iio:device0/in_voltageX_raw while my > program was running and it worked a couple of times, and got busy a bit also, > then the touch screen locked up. This is expected because when the buffer is enabled the device IS busy. > > I have not tried to use /sys/bus/iio/devices/iio:device0/in_voltageX_raw from > in my program, I was hoping for a lighter weight access that didn't require > so many opens & closes. I'm under the impression that I can only get one > reading per open if I try to read /sys/bus/iio/devices/iio:device0/in_voltageX_raw. > Or can I get multiple readings if I do multiple reads. > You should be able to keep the file descriptor open and perform multiple reads. It is necessary lseek before reading from the same channel again. lseek(fd, 0, SEEK_SET); You will need a separate file descriptor for each channel. -- 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
