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Forum I am not able to interface JHD162A LCD to any of the PSoC Kits?
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I am not able to interface JHD162A LCD to any of the PSoC Kits?

gsgill112
gsgill112 over 10 years ago

I have tried the Cypress LCD component as well as a Community component where you can select different pins.

In both the cases I get some junk on display ? I did manage to get the custom component working for a while but now that's also not working.

 

I have been through the LCD component's datasheet like a 1000 times and almost tried all the functions but with no luck ?? Please help !!

 

my main looks like :- >

 

main(){

 

LCD_Start();

LCD_Print_String("Hello");

while(1);

}

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  • juanes.pazj
    0 juanes.pazj over 10 years ago

    Is your wiring correct?

    image

    check this out this project has a lcd block with 4 data wires interface instead of 8 for a 2x16 character LCD

    http://www.cypress.com/?app=forum&id=2492&rID=75707

     

    as for the code

    before every print you make you need to set the position from where it would start writing

    LCD_Position(1,0);

    LCD_PrintNumber(Weight);

    LCD_Position(0,0);

    LCD_PrintString("Print:");

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  • gsgill112
    0 gsgill112 over 10 years ago in reply to juanes.pazj

    Yes my wiring is correct the above Image is a custom Component which I found on psoc developer fourm.  and out of ~20 tries I have made the LCD worked once or twice using the above component. I have also double checked the LCD with Arduino's LiquidCrystal Lib and the Lcd works just fine.

     

    I have no luck with the Cypress LCD component. I guess I have to write my own component.

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  • juanes.pazj
    0 juanes.pazj over 10 years ago in reply to gsgill112

    It worked perfectly for me

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  • dougw
    0 dougw over 10 years ago in reply to gsgill112

    A common problem with these displays is when the host MCU is reset, it may not reset the LCD and the LCD ends up in a state that the MCU is not expecting. Be sure the LCD is being properly reset and its mode is entirely under control. Find a sequence of instructions that is guaranteed to put the LCD in a known state and execute whenever there is doubt. There are several of these sure-fire sequences published on the net - usually for arduino applications.

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  • dougw
    0 dougw over 10 years ago in reply to gsgill112

    A common problem with these displays is when the host MCU is reset, it may not reset the LCD and the LCD ends up in a state that the MCU is not expecting. Be sure the LCD is being properly reset and its mode is entirely under control. Find a sequence of instructions that is guaranteed to put the LCD in a known state and execute whenever there is doubt. There are several of these sure-fire sequences published on the net - usually for arduino applications.

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  • gsgill112
    0 gsgill112 over 10 years ago in reply to dougw

    @Douglas Wong, I guess the LCD_Start() takes care of resetting the LCD, at-least with the MultiPin component ! I don't know how to view and modify the code for the Stock Component ?

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  • dougw
    0 dougw over 10 years ago in reply to gsgill112

    You don't need to modify the code if you can send commands (as opposed to data).

    Just find a command sequence that ensures the display ends up in a known state, regardless of where it started.

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