I cant find Hitachi 44780 up and down arrows


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  1. #1
    Member yvesmazzon's Avatar
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    Default I cant find Hitachi 44780 up and down arrows

    I want to display UP and DOWN arrow on my Hitachi display. I'm sure they are a single hex value and when I look at Hitachi ascii table there Is a raw of top bin numbers along with a column of bin numbers but I'm not sure how to Implement these. Many thanks.

    Regards,

    Yves

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    Fanatical Contributor top204's Avatar
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    Default Re: I cant find Hitachi 44780 up and down arrows

    It depends on the ROM within the LCD. Some have extra characters than others.

    The best way to see what value will produce the character you're after is to make a simple loop:

    Code:
        Dim Chars As Byte
        Cls
        
        For Chars = 0 To 255 
            Print At 1,1, Chars
            Print At 2,1, Dec Chars, "  "
            DelayMS 300 
        Next
    When the character you want is displayed on the top line of the LCD, the second line has its value. You can add a larger delay if it is working too fast for you.

    If the LCD does not have the characters you're after, you can always create them using the available user defined characters on all Hitachi chipsets. This will also make sure your code works on all Hitachi LCDs, even the Chinese rip off ones that don't quite come up to standard, and have things missing from them.
    Last edited by top204; 2nd February 2017 at 19:48.

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    Member yvesmazzon's Avatar
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    Default Re: I cant find Hitachi 44780 up and down arrows

    Thanks very much Lee, this a perfect idea.
    Regards,
    Yves

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