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'[SX] SXB Example: Serial LCD - Problem using a Fut'
2008\11\09@114849 by tdg8934n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

Has anyone had any problems using other HD44780 based LCDs with this SX Example?

If I use my Professional Development Board (PDB) and the Parallax Parallel LCD with this example using an SX28 and a BS2, it works fine.


The working Parallax Parallel LCD displays on the first line SERIAL LCD
The working Parallax Parallel LCD displays on the 2nd line            WITH SXB
and then continues with its program as it should.


However, the Futurlec Parallel LCD ( http://www.futurlec.com/LED/LCD16x2BL.shtml ) only displays:


First line: SARAAL LC@
2nd line:{nothing}

after a few seconds the screen clears and starts over - probably the rest of the program trying to run but can't.


I do have the backlight on the Futurlec LCD but that is not related.


Is there a different Display / RAM locations between different types of HD44780 based displays? I would hope not.


Has anyone seen this before or know how to fix this?

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2008\11\09@155217 by JonnyMacn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

Maybe you have a bad display....

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2008\11\09@164808 by tdg8934n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

Jonny Mac does it again!
Luckily, I had another new one. I soldered on my cable and low and behold I now see:

0123456789012345
0123456789012345
I guess I never thought that a new product could be bad - but it was.

Now its time to clean up the code and get it to work in my application.

Thanks so much!

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2008\11\09@173332 by mojorizingn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mojorizing wrote:

Hi Tim,
Interesting find.  This probably being a one time event as far as the failure is concerned (hopefully), how would you compare the quality of the Futurlec's display versus Parallax?

Thanks, Kevin
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2008\11\09@181625 by tdg8934n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

I still have to do some tweaking but they are comparable from what I can see so far. I did have to buy a 10K mini-pot from radio shack, a couple of resistors, IDC connectors, extended waiting time for shipping from China, etc. Also keep in mind that the parallel LCDs do require quite a bit of I/O and that is one reason I am using an SX48 proto board. Still all in all for the pain it has taken me - my choice would be the Parallax serial LCD! Much easier to code and set up.

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2008\11\10@042941 by beann/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

One advantage the parallel interface has it that it doesn't require strict timing. So if you have an interrupt routine it will not affect communication with a parallel LCD.

Bean
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