Re: [Lcd4linux-devel] lcd4linux timings for Samsung 16x4 display

[Dennis G. <re...@gm...>]

http://pdf1.alldatasheet.com/datasheet-pdf/view/105087/SAMSUNG/16T202DA1J.html

Thanks Michael.

I hope you are wrong about the voltage issue as that appears to be a
nontrivial fix.

My suspicion that it is timing is based on this:

- With the original motherboard (GA-MA780G-UD3H) and processor (Phenom
II x4 940) it worked fine.
- Same motherboard, but upgraded processor (Phenom II x6 1090T) it
mostly worked, but sections of the display that were being updated (eg
CPU use) would occasionally shift right, then back (so CPU: 15% might
read CPU: 155, then CPU: 205 etc - the "%" got overwritten at some
point) This could be fixed by restarting the service
- New motherboard + PCI parport card, same behavior, but now the
second line vanishes after a while

Note that I misspoke earlier; it is a 16x2

What is maddening is that the display mounting points are slightly
larger than what appears to be standard. I was going to replace it
with a Matrix Orbital USB display, rather than buy a parport card, but
the mounting holes are differently spaced.

I guess we'll see.

Thanks for the assist.

DG

On Tue, Mar 3, 2015 at 1:28 AM, Michael Reinelt <mi...@re...> wrote:
> Hello Dennis,
>
> post a link to the datasheet, and your config, and I will have a look at it.
>
> Maybe its not a timing issue, but a voltage issue: Some display require 5V
> signal level, and modern parports provide just 3.3V
>
> In this case you have to use a level shifter (e.g. 74HCT245)
>
> Am 2015-03-03 um 03:52 schrieb Dennis Grant:
>>
>> Hey there. I hope someone is still on this list.
>>
>> I have a display based on a Samsung 16T202DA1J 16x4 VFD. I have been
>> using the HD44780 display driver with some success (every once and a
>> while the display would overwrite a char to the left) but a recent
>> motherboard upgrade and a change to a PCI based parport (yup, it is
>> parport driven) has caused more problems.
>>
>> Given that is *almost* works - it's fine for a few minutes, then
>> eventually corrupts - I think it is a timing issue.
>>
>> I have the datasheet PDF. Anybody feel like looking at it for me and
>> telling me what timings I should be using?
>>
>> Thanks.
>>
>> DG
>>
>>
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>
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