Map Navigation handwrite long delayed.
1. custorm board: iMX6 DualLite; BSP-3.10.53 , wayland, Qt5.2.1 , Cypress CY8CTMA touchscreen.
2. Only the touchscreen are connect to i2c-3. I have measured the interrupt of the touchscreen and sclk/data of the i2c-3 with oscilloscope, Roughly 85 interrupts Per second, it seems normally with the oscilloscope or from the touchscreen dirver log or evtest.
Maybe the performance of Qt or something else? This puzzled me for several weeks. Attached with a short video of long delayed handwriting.
Any advice would be greatly appreciated
Official NXP i.MX6 BSP Cypress CY8CTMA touchscreen is not currently supported, so I guess the reason fo your delay could be due to the drivers itself, as suggestion check the interrupts times for touch kernel events. calls.
Hope it helps