LCDOUT custom commands - how to?

[keithdoxey]

It is the DATA wire (brown) coming from ICSP programmer (AN589).

Wires:
black = GND (Vss)
red = +5V (Vdd)
yellow = MCLR
orange = Clock
brown = Data

Ok. might be worth trying with R/W just connected to 0V.

You're right. The LED you are talking about is there and as you suggest, I use it as an optical check. Do you mean I should connect more LEDs just to make sure it works fine?

Yes. Put 8 leds on there and observe the count eg

OFF OFF OFF OFF OFF OFF OFF OFF (0)
OFF OFF OFF OFF OFF OFF OFF ON  (1)
OFF OFF OFF OFF OFF OFF ON  OFF (2)
OFF OFF OFF OFF OFF OFF ON  ON  (3)
OFF OFF OFF OFF OFF ON  OFF OFF (4)
OFF OFF OFF OFF OFF ON  OFF ON (5)
......
ON  ON  ON  ON  ON  ON  OFF OFF (252)
ON  ON  ON  ON  ON  ON  OFF ON (253)
ON  ON  ON  ON  ON  ON  ON  OFF (254)
ON  ON  ON  ON  ON  ON  ON  ON (255)

If the sequence doesnt work then the port isnt being correctly set

Yes. As mentionned earlier, I made this check too and with my other displays (have lots of them), no problem!!

Sorry, missed that.

Good luck !!!!

Keith

[flotulopex]

I must wait unil tomorrow morning: missing a few LEDs...

[Darrel Taylor]

flotul,

I've been looking at the pictures, and it appears that the data bus is reversed.

There's 4 wires (2 geen, 2 white) on lcd pins 28-31. They are connected like this.

<pre> LCD PIC <br> 31 (D4) 9 (B3)<br> 30 (D5) 8 (B2)<br> 29 (D6) 7 (B1)<br> 28 (D7) 6 (B0)<br></pre>Should be the other way around.
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[keithdoxey]

flotul,

I've been looking at the pictures, and it appears that the data bus is reversed.

There's 4 wires (2 geen, 2 white) on lcd pins 28-31. They are connected like this.

<pre> LCD PIC <br> 31 (D4) 9 (B3)<br> 30 (D5) 8 (B2)<br> 29 (D6) 7 (B1)<br> 28 (D7) 6 (B0)<br></pre>Should be the other way around.
<br>

You have better eyes than me. I cant tell from the photos.

Would be a lot easier with 4 different colours though, or even GGWW instead of GWWG because at least you could tell it was reversed

[Darrel Taylor]

Yeah, I was going Bug-Eyed too trying to follow them all.

PICT0003small.JPG in Post#34 helped.

Had to save it to disk so I could zoom in and out with an Image Preview.
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[Archangel]

Yeah, I was going Bug-Eyed too trying to follow them all.

PICT0003small.JPG in Post#34 helped.

Had to save it to disk so I could zoom in and out with an Image Preview.
<br>

I use Firefox and it's Zoom plugin, very helpful, Zoom in right in browser.
JS

[flotulopex]

Yes, this is something not clear.

In one of my previous posts, I mentionned that I cabled the data lines according to the AE support. They say it has to be connected something like D7 = DB0, D6 = DB1 and so on.

But, as you say, I can't believe it is correct; it looks to be reversed. Logically, D4 is connected to DB0 (B0), D5 to DB1 (B1) and so on.

Until now, I'm testing every program modification with both configuration of data lines since absolutely nothing appears on the display.

Another thing: I have two (alsmost ) same displays. One is 2x16 and the second is a 3x16 one. I swap them too just to make sure both react the same.

MCLR, DATA and CLOCK lines from the programmer are physically disconnected from the circuit after the burning process.

I'll recable this with different colours this afternoon and with the "logical" data bus lines way.

[keithdoxey]

Yeah, I was going Bug-Eyed too trying to follow them all.

PICT0003small.JPG in Post#34 helped.

Had to save it to disk so I could zoom in and out with an Image Preview.
<br>

That did the trick, can see it now

I do like the look of those displays. also found the following datasheet in English which makes things a bit clearer

http://www.electronic-assembly.de/en...oma/dog-me.pdf

I notice that initialisation is different for 3.3V and 5V working for the Power Control, Follower and Contrast registers.