US Patent 10514803 Pen in field force sensing calibration

A method for identifying an error in a tip status indication from a stylus includes detecting input from a stylus with a digitizer sensor via an electrostatic (ES) wireless communication channel established between said stylus and said digitizer sensor. An indication of a tip status is received from the stylus, indicating whether the tip status is in hover or touch. The tip status is verified based on input detected with the digitizer sensor. When an error is identified in the tip status indication, a notification of the error is sent.