After spending a lot of time with an STM32F469 discovery board I found that the touch screen doesn't have good linearity at all. You can't draw a straight line across the screen. If you for instance, start on the left drawing across even with a ruler, the resulting trace goes about half way across and then dips several millimeters and comes back up. The resulting trace looks like the side view of a spoon. I know these boards are cheap but I haven't seen anything like this with others. Has anyone else had this experience? I would hate to have to go thru the hassle of returning it as I doubt Mouser would take it back.