Problem with frequency and LCD display

Mikat · Post by **Mikat** » Mon Jan 29, 2007 10:21 am

Steve,the problen should be in the 4mhz hello file,its one of the 3 hello files i sent to you,so you shoul to be able to test with it... The problen might be in controller,but i have 2 displays,acting same way,one have ks66u,and the other ks70b controller.. I try to test today one more display,it has "original" hitaci hd44780 controller.
And seems that the problem exist at 8mhz clock too,i quikly testd yesterday on 18f4585,and at least in it osc configured on 8mhz,and chip settings 8mhz the lcd prints mess..

Post by **Steve** » Mon Jan 29, 2007 10:25 am

does this problem still exist with the latest v1.3 of the LCD component?

Mikat · Post by **Mikat** » Mon Jan 29, 2007 10:39 am

steve wrote:does this problem still exist with the latest v1.3 of the LCD component?

Yes it does.
And there is few other things,in my last project,when i use the lcd clear macro,the lcd starts print mess.. And when i test the files what Ben sent me,the cursor stays blinking after the last printed character (not sure was that every time),but that does not happen with delay and different chip clock..

Mikat · Post by **Mikat** » Tue Jan 30, 2007 8:31 pm

Hello guys.

I tested today with 2 more displays,the other was same Displaytech type,but different display,and the other was some old 2x16,and it has hd44780 controller,made by Hitaci,and both of those have the same problem...
So i dont think its a controller problem.
Have you tested my hello files,does those work on you hardware?

Post by **Benj** » Wed Jan 31, 2007 10:34 am

Hello Mikat

The files you sent me compile and work fine on our LCDs here. Can you send me the .c, .fcf and the .hex files from your 4MHz program so I can see if it is your compiler at fault.

Mikat · Post by **Mikat** » Wed Jan 31, 2007 10:50 am

Benj wrote:Hello Mikat

The files you sent me compile and work fine on our LCDs here. Can you send me the .c, .fcf and the .hex files from your 4MHz program so I can see if it is your compiler at fault.

Ill sent the files you today.
Was there the c,asm and hex files in the archive i sent to you,or did i forgot those?
If there was,have you tested the hex file i sent?
And have those files delay before lcd start macro?

Post by **Benj** » Wed Jan 31, 2007 3:55 pm

Was there the c,asm and hex files in the archive i sent to you,or did i forgot those?

I think it was just the .FCF files you sent before.

Mikat · Post by **Mikat** » Wed Jan 31, 2007 5:11 pm

Ben,i sent the files for you,tell us when you have tested those..

Post by **Benj** » Wed Jan 31, 2007 6:33 pm

Hello Mika

I have tested the hex files you sent me. They all seemed to work fine here. What type of crystal are you using and have you tried a different one. It may be that it is ever so slightly out and therefore is causing these irregularities in your LCD routine.

Mikat · Post by **Mikat** » Thu Feb 01, 2007 6:21 am

Well well... Seems that the problem is in my hardware.. I havent tested more than one crystal,and the int oscillator,when i had change,ill try something else,ill had to test that will this work on pcb,or is the error same..

Ben,could you quickly test the spi component on 18f4585,because when i add the program nothing but c icon osccon = 0x6c;,and spi init macro,ill get compiler error,was it sspcon,if i remember correct.. With 16f,the spi compiles fine..

By the way,you mentioned on spi tread that you made spi codes,could you sent me the fcf files...

Post by **Benj** » Thu Feb 01, 2007 10:40 am

Let me know how it goes. Still a very strange problem.

You are correct the SPI component for the 18F4585 is incorrect. The register sspcon should be sspcon1. This can probably be changed in the FCD file very easily. I will email you an example file that uses C code Icons to call the SPI C routines.

Post by **Steve** » Thu Feb 01, 2007 11:00 am

The SPI error cannot be corrected within the FCD file. Instead, you should put the following into the "definitions" box of the "supplementary code" window:

Code: Select all

#define sspcon sspcon1

This is not a perfect solution, but should work ok.

Mikat · Post by **Mikat** » Thu Feb 01, 2007 11:47 am

Wery few things in this word is perfct:).
With me,its okay if it works,so thanks guys..
The lcd problem is strange,but probably next week i get the relays in my project,and i can test the lcd in actual pcb,now its wired on terminal board,so maybe that will fix the problen,at least i hope so..

Post by **Rosenbaum** » Wed Mar 14, 2007 1:26 pm

Hi,
I have exactly the same problem, using a PIC16F716 with an AV1624 LCD in combination with a 4MHz or 2MHz quartz. If I adjust the frequency on the same value as the quartz has, no matter if it is a 4 MHz or a 2MHz, the LCD is not working. If I adjust it on a different value it works with both. Very strange. Is there a solution, or isnΒ΄t it ?

Post by **Benj** » Wed Mar 14, 2007 5:18 pm

We have a range of LCDs arriving here at Matrix and at some point this week I will have a look at the C driver file for the LCD. Obviously there is a small problem with the way it is currently functioning.

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Problem with frequency and LCD display

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