topic Is resistive multi-touch a possibility with eGUI in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-resistive-multi-touch-a-possibility-with-eGUI/m-p/508696#M32030 <HTML><HEAD></HEAD><BODY><P>We are close to launching a product that uses eGUI on a K22.&nbsp; Our LCD is a resistive touchscreen.</P><P></P><P>Recently, testing found an issue on our Home Screen.&nbsp; We have 3 buttons spaced across the bottom of the screen.&nbsp; If done right, testing shows that touching the leftmost and rightmost buttons at the same time can trigger the button in the middle.</P><P></P><P>Since we are using a voltage to interpret where touches are in the X and Y coordinate, we've used two seperate touches to effectively fake eGUI into believing that there was a single touch on that middle button.</P><P></P><P>This may just be a limit of the resistive touchscreen, but I was wondering if there might be a software solution to this problem.</P></BODY></HTML> Fri, 15 Apr 2016 20:36:37 GMT michaelsthomas 2016-04-15T20:36:37Z Is resistive multi-touch a possibility with eGUI https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-resistive-multi-touch-a-possibility-with-eGUI/m-p/508696#M32030 <HTML><HEAD></HEAD><BODY><P>We are close to launching a product that uses eGUI on a K22.&nbsp; Our LCD is a resistive touchscreen.</P><P></P><P>Recently, testing found an issue on our Home Screen.&nbsp; We have 3 buttons spaced across the bottom of the screen.&nbsp; If done right, testing shows that touching the leftmost and rightmost buttons at the same time can trigger the button in the middle.</P><P></P><P>Since we are using a voltage to interpret where touches are in the X and Y coordinate, we've used two seperate touches to effectively fake eGUI into believing that there was a single touch on that middle button.</P><P></P><P>This may just be a limit of the resistive touchscreen, but I was wondering if there might be a software solution to this problem.</P></BODY></HTML> Fri, 15 Apr 2016 20:36:37 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-resistive-multi-touch-a-possibility-with-eGUI/m-p/508696#M32030 michaelsthomas 2016-04-15T20:36:37Z Re: Is resistive multi-touch a possibility with eGUI https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-resistive-multi-touch-a-possibility-with-eGUI/m-p/508697#M32031 <HTML><HEAD></HEAD><BODY><P>Multitouch is not possible on resistive touchscreen.&nbsp; Period.</P><P></P><P>The controller can only measure two voltages -- a proportional X, and a proportional Y.&nbsp; More than one touch on the screen will just 'short out' part of the resistance, leading to an intermediate relative voltage.</P><P></P><P>No magic can sort it out.</P></BODY></HTML> Fri, 15 Apr 2016 23:53:53 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Is-resistive-multi-touch-a-possibility-with-eGUI/m-p/508697#M32031 egoodii 2016-04-15T23:53:53Z