LCDOUT custom commands - how to?

[flotulopex]

Looking at your photos it looks as if Pin37 of the LCD R/W is connected via a blue/green wire to pin 13 of the PIC RB7. There also seems to be an additional brown wire flying off somewhere from this pin. Where does the other end of that connect to ?

It is the DATA wire (brown) coming from ICSP programmer (AN589). I've attached a "full view". Green LED on programmer is for power presence and yellow one (between both black relays) is for connection/disconnection of MCLR-DATA-CLOCK.

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

One other point... I suggested putting LEDs on the PIC and observing it counting up to ensure that the count operated correctly. You said that you tested the pins with a logic probe, presumabley one pin at a time just to observe the two different states.

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?

Do you have access to a "normal" HD44780 display of any size just to test that your PIC is correctly configured. From what I have seen so far there shouldt be any real problems getting this display to work as it is 44780 compatible. If you try with a normal display and it still doesnt work then something isnt right with the PIC. Once you have that working it should just be a matter of swapping the displays.

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

[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.
<br>

[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.
<br>

[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

[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.