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'[EE] Trouble on 2nd line of LCD'
2009\07\11@002701 by solarwind

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On Sat, Jul 11, 2009 at 12:16 AM, Steve Maroney<spam_OUTsteveTakeThisOuTspambcsupportllc.com> wrote:
> Also, I think I should add that If I turn the contrast all the up, to
> where I cant read the chars and see square blocks, I thought I would see
> the second row blocks, as I do the first row, but I only see the first
> row.
>
> Hopefully that makes some sense.

Without examining your post in too much detail (have something urgent
that needs attention), I would first assume that it would be a RAM
address issue. I wrote some working code for the PIC18 in C18 - maybe
it would be of some use to you:

solar-blogg.blogspot.com/2009/02/pic18-hd44780-lcd-driver-interface-code.html

2009\07\11@010623 by Sean Breheny

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I agree with the suggestions mentioned so far, especially regarding
the timing. One other item: some LCDs are 4-bit only, even though
there are pins for 8 data bits on the PCB.

Sean


On Fri, Jul 10, 2009 at 11:31 PM, Steve Maroney<.....steveKILLspamspam@spam@bcsupportllc.com> wrote:
{Quote hidden}

>

2009\07\11@012058 by Tony Vandiver

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That's a good point, but you should be getting a garbled mess for
characters on the first row if it were set up for 4 bits but you were
treating it like an 8 bit display.

Sean Breheny wrote:
{Quote hidden}

>> --

2009\07\11@122829 by Sean Breheny

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Yes, you're right. I actually thought of that, too, but only after I hit SEND :)

Sean


On Sat, Jul 11, 2009 at 1:20 AM, Tony Vandiver<.....tonyKILLspamspam.....traceelectronics.com> wrote:
{Quote hidden}

2009\07\11@134509 by Harold Hallikainen

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Are you sure the display is initialized for two lines? When I've had
initialization fail, the first line is dark and the second line is light.
After initialization, both lines are light. I think the chips come up in
single line mode.

Just a guess!

Harold


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