Problem with your test application KontrastBeispiel.exe

    Are you using the same display settings as on PicoCOM2? Is contract control enabled in your display settings (ContrastEnable)? Could you please post the complete display settings?


    Additionally contrast values on PicoCOM4 are different to PicoCOM2 in range and direction. A contrast value of 0 on PicoCOM2 caused 0V on the VEEK pin. On PicoCOM4 a contrast value of 0 causes VEEK to drive full 3,3V.
    We have changed this on PicoCOM4 to be common to other boards again. PicoCOM2 was the only board where the contrast value was not inverted.

    Software developer, F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

    Quote


    Are you using the same display settings as on PicoCOM2? Is contract control enabled in your display settings (ContrastEnable)?


    Yes, Yes

    Quote


    Could you please post the complete display settings?


    Does it work to change contrast settings with ndcucfg? Please try to set the minimum and maximum contrast value with ndcucfg

    Code
    1. contrast set 0
    2. contrast set 0xfff


    Is a bootscreen activated?

    Software developer, F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

    Thank you. Now it works.


    PicoCOM2 contrast value: 0 - 255 ; Where 0 is minimum contrast.
    PicoCOM4 contrast value: 0 - 4095 ; where 4095 is minimum contrast.


    No bootscreen is not activated.