Touch Screen issue

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  • Touch Screen issue

    Hello,

    I am using LPC1788 controller and 7 inches display with touch screen with 800 x 480 resolution.
    I am calibrating the touchscreen using the sample given.

    I get 4 adc values Left, Right, Top, Bottom which i pass to emwin API functions which calibrate for X and Y.
    I am able to press buttons on screen but for smaller area widgets such as Radio, Checkbox i have to press a little higher or lower than the radio selection area to actually get the radio selection event and to get the radio selected.

    The issue comes if the radios are on the top area of the screen. I don't get this issue when any radio selection is at the mid portion of the screen or bottom of the screen

    I have tried calibration many times but not getting accurate results for Radio and checkbox. I take 4 values from the top most and bottom most corner of the screen
    Please let me know what can i try else

    Thanks

    Regards,

    Anuj