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

gsgill112

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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  • 0

    I think you need to see the low level approach to ensure correct operations. I would checkout this:

    http://www.scribd.com/doc/17686517/JHD162A-LCD-Code

    Especially the Init code with correct delay...

    Your problem is that the display keeps its state during MCU reset. When cold-booting, the initial data mode is 8-bit which you immediately switch to 4-bit which reads data with a pair of EN pulses.

    When you reset the MCU, you do not know whether even or odd number of EN pulses were sent. So you have to somhow reset the display even if it does not have reset pin.

    This can be done by sending 0x33 0x33 (in 8-bit mode it will mean 4-times switch to 8-bit, in 4-bit mode it will mean once or twice switch to 8-bit). Then you can be sure that you always start from the same state.

    Then proceed with regular 0x32 (or 4-bit 0x02 if you have single 4-bit write function), 0x28 to get into 4-bit 2-line mode.

     

    Cheers,

    Clem

  • 0 in reply to clem57

    and as far as other platforms are concerned, I have written code for CCS and have also worked with AVR, and have successful results. but I am like very new to PSoC so , Struggling a bit image  

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