Has anyone used ST7565R type LCD with a PIC?

[cobra1]

I am trying to write some software for the ST7565R type LCD display, im using flowcode to do this so i know you wont be able to help with my code.

Whats happening here is sometimes it works as it should, correct numbers or letters in the correct palces, but more often than not i get a messed up display, numbers change to $$$$ signs and letters change to !;*($$£ signs.

Now just to make this even more wierd and annoying, if i change the PIC and put the same code onto it, (iv done this with 3 different PICs) the results differ each time, on PIC 1, the random symbols are in the place where the letters or numbers are, on PIC 2, there on different parts of the display, and on PIC 3, theres just a single pixel and a $ on the screen. All 3 PICS run the same code.

Iv tried this both on breadboard and on Professional PCBs, I know my hardware is correct as iv had this working perfectly in the past, but now it just refuses to work, iv even tried different LCDs but to no avail.

So, time for a new approach, it has been suggested that my code my be "buggy" and things are happening in the background at random, giving me this problem im having where sometimes it works but most of the time not.

So, has anyone ever used this type screen who could make me a sample piece of code to try that way i will know if its my code or something hardware related.

Im using a PIC18f26k20

Oh yeah, my current software uses the memory to store information and then updates the screen in one go, not sure if this would cause problems like this.

If anyone can help me out with this test software then i will send details of LCD pinouts.

Cheers

 

[Sceadwian]

No one can help you with anything if you don't post the code.

 

[cobra1]

The code is 52000 characters, i can only post 20000, which part do you want?

 

[Sceadwian]

Attach it as a file.

 

[cobra1]

How do i do that?? Iv never attached a file before, only pictures

 

[Vizier87]

Turn on the advanced options.
**broken link removed**

 

[Sceadwian]

That's only in the advanced posting options by the way.

 

[SneaKSz]

Is the LCD initialized correctly and are the wires attached properly?

 

[cobra1]

Hi guys,

Iv solved my problem now, i changed the extended instruction set in the config and it seems to have fixed it.

 

[Vizier87]

well done. Please post some details on the LCD here. I'd like to see it.

 

[uChip]

Way to go cobra1...I'm also a flowcode 4 user trying to get a ST7565R type LCD to work with flowcode (it's actually a dogl128-6e from Electronic Assembly Inc.). Not finding much at Matrix to help, I would greatly appreciate a point in the right direction; an example .fcf to demonstrate it working at all would be great! Many thanks.

 

[cobra1]

can you post a link to your LCD?

 

[uChip]

Here's a link to the datasheet:

https://www.electro-tech-online.com/custompdfs/2011/09/dogl128-6e.pdf

I found these at Mouser; I'm very hopeful to get these working because they have a lot of them and the price is good. Also easily backlit!

 

[richard.c]

Hi,

To answer your original question, see my old post https://www.electro-tech-online.com/threads/glcds-with-pic-18f-assembler.40676/

The only thing I would change to it is the type of voltage translator chip - use a 74HC4050 instead of the 74AC08

 

[uChip]

Great work richard.c in your 18F GLCD's post....as a noob in this forum, now I know I'm in the right place. Always nice when a great mind can lend a hand! I knew about the LED backlight accessories for EA's DOG series LCD's, but not about the touch screen addons...now I see that EA only has the analog style touch screen. Do you have part numbers for the digital one?

 

[uChip]

Just found it in the earlier post. It's the EA TOUCH5x3-A. Sadly, not offered at Mouser.

 

[uChip]

Great work richard.c in your 18F GLCD's post....as a noob in this forum, now I know I'm in the right place. Always nice when a great mind can lend a hand! I knew about the LED backlight accessories for EA's DOG series LCD's, but not about the touch screen addons...now I see that EA only has the analog style touch screen. Do you have part numbers for the digital one?

 

[richard.c]

Hi,

Glad you liked that old glcd post, still using both those displays in current projects.

Although I experimented with that very easy to use Digital touch screen I never used it in a full project and have not seen them on sale elsewhere.

I purchased it from the EADOG UK distributor but not 100% sure it was a EADOG part or just some suitable ones he was stocking back in 2009.
Cannot see them on the current web site but perhaps worth an email to check with Marc if he has any left in stock https://www.mmselectronics.co.uk/sitemap.htm

Just as a byline if you are thinking of moving into the C arena, the Arduino system has libraries for the EA 128x64 with a suite of text and graphics demos.
Got this literally up and running in about 5 mins !

 

[uChip]

Well I've got my LCD, and I've attempted to get it to talk with Flowcode, but with no success. I've attempted to use their Custom_Code.C download, but it looks unfinished, and I'm really not sure what to do with it. If I had even the simplest "Hello World" example .fcf to start reverse engineering, I think I could make it work. Everything else I've done with Flowcode has come easily, but this is becoming a humbler. I value any suggestion you have.