Problems with two 128x64 Glcds connected

Testing/Troubleshooting
1

Hello!

After a 2 year pause, I’ve just finished the core module and connected the first lcd. Being quite a newbie to the work with microcontrollers, I was surprised that everyhing worked perfectly. I updated MIOS and changed the PIC ID (graphical LCD). Everything worked, the display reads “READY.”

Then I connected the second LCD, and surprisingly it nearly also worked. Only there seems to be something wrong with some offset or something similar. It looks like this:

(while booting)

On the right display, some characters seem to have “moved over” a little. But after that, “READY.” is written on both displays correctly.

Do I have to change something in the MIOS; can you help me?

Or am I completely mistaken and my wiring is bad somewhere?

Thanks for your response!

Regards from Austria,

Mischa

2

Just guessing… I don’t know if the GLCD driver in the bootloader supports dual displays… That would explain why it is OK once MIOS loads up..

3

Ok, now I uploaded the LC App (just for testing, without any source code changes)

Now the result looks like this:

(I don’t know yet much about Midibox coding, but I’m working on it  8))

Seems to be quite a mess…as far as I know, the startup screen should spread over both screens, am I right?

Anyone now whats wrong?

Also, it seems that the most right 16 pixel column is unused (like I have found in other threads), but i think I will take care of this later…

Thanks for your help!

Mischa

4

Yeh you got it right the first time, your offsets are out.

5

Can you tell me where to do that?

As I said, I’m not yet familiar with the MIOS coding.  :-[

thank you!

mischa

6

hi

you clearly don t have the latest MIOS installed, look here

http://www.midibox.org/forum/index.php/topic,9759.msg71740.html#msg71740

7

hi!

thanks you for answering!

hi

you clearly don t have the latest MIOS installed, look here

http://www.midibox.org/forum/index.php/topic,9759.msg71740.html#msg71740

I have found this thread but I do think i have the newest version of MIOS, on my Screen it says 1.9f while booting (as seen on the picture in the first post)

(while booting)

I do think i have tho change the code somewhere, but I have no idea where to look…

thanks!

mischa

8

It looks like the CS lines have an inverted polarity.

Could you please try this test application:

http://www.ucapps.de/mios/lcd7_ks0108_v2.zip

The ASM version has inverted CS lines enabled by default, so that you can try it out w/o rebuilding a .hex file

The C version has inversion disabled

Note that the inbuilt GLCD driver of MIOS allows to invert the polarity as well. I can search for the details once I know if this is the issue…

Best Regards, Thorsten.

9

hi

you clearly don t have the latest MIOS installed, look here

http://www.midibox.org/forum/index.php/topic,9759.msg71740.html#msg71740

it looks clearly i am not able to see a picture..

10

Thanks thorsten!

…but I fear the inverted CS lines are not the problem…now my screens look like this:

far too many knows on the screen i think  >:(

@cimo: sorry, the images are uploaded to the webspace of my university, maybe the blocked some IPs

or something…I will upload them elsewhere as soon as possible!

regards,

mischa

11

Are you able to re-assemble the code?

I think that I found a MPASM->GPASM conversion error in app_lcd.inc:

USER_LCD_DetermineCS
        SET_BSR MIOS_LCD_OPTION1
        BRA_IFSET MIOS_LCD_OPTION1, 0, ACCESS, USER_LCD_DetermineCSInv
[/code]


Should be:
[code]  
USER\_LCD\_DetermineCS  
        SET\_BSR MIOS\_LCD\_OPTION1  
        BRA\_IFSET MIOS\_LCD\_OPTION1, 0, BANKED, USER\_LCD\_DetermineCSInv

If you are not able to modify and rebuild the code, please let me know and I will send you a new .hex file

Best Regards, Thorsten.

12

Yes Im able to assemble .hex files…

I changed the app_lcd.inc file, but now I have got a nearly blank left screen with some half buttons on it, the right screen remains nearly the same…

again, thanks for helping me out!

13

How does it work now when inversion is disabled in the main.asm file?

Best Regards, Thorsten.

14

when i put it " non inverted" and the new app_lcd.inc, its the same result as in the start

(this:

)

15

Ok, so the displays are working with non-inverted CS

The left GLCD works as expected, the right GLCD shows a scrambled screen.

Since my 240x64 display uses 4 CS lines, and the demo screen (as well as MBLC screen) is displayed correctly, my assumption is a wiring error.

Could it be, that the CS3 line of the right GLCD is always enabled (=1), because it shows all components of the screen.

CS line mapping:

USER_LCD_LAT_CS1        EQU     LATC            ; Pin C.5

USER_LCD_PIN_CS1        EQU     5

USER_LCD_LAT_CS2        EQU     LATC            ; Pin C.4

USER_LCD_PIN_CS2        EQU     4

USER_LCD_LAT_CS3        EQU     LATD            ; Pin D.0

USER_LCD_PIN_CS3        EQU     0

USER_LCD_LAT_CS4        EQU     LATC            ; Pin C.2

USER_LCD_PIN_CS4        EQU     2

It could be a bridging fault (check your solderings)

Best Regards, Thorsten.

16

Okay thank you!

I’ll swap the CS lines from display 1 and 2 to see if this is the error.

I will let you knwo the results!

Thanks & regards,

mischa

EDIT: Yep, you were right, same result with swapped displays…guess I’ll have to recheck my wiring…

17

Thorsten you are a genious!

You where right with CS3…

When i labeled my plugs I misinterpreted the board layout

thinking that J8 was the “row” on the bottom because it’s written J9/J8…well i should have rechecked that too, not only my soldering!

but now i plugged it in the other way round and..

I even managed to move everything in the center and the knobs far to the right (having a 256x64 instead of a 240x64) –> my first efforts in “coding” MIOS applications, yay :smiley:

tomorrow Im gonna continue with the LC App, thanks for your help!

Regards, mischa

18

Hello!

now both of my displays seem to work properly, so I uploaded the LC Application.

Now it looks like the LC App still thinks I have character LCDs connected. I have already set the PIC ID header to 0000000000001000 with the change ID application.

Do i need some changes in the LC source Code?

I have played with these values and the screen changes accordingly, but I never get a “graphical” screen.

#define LCD_USE_SECOND	0 ; the emulation handles with two character LCDs if 1
#define LCD_EMU_COL    55 ; number of emulated columns (characters per line)
					;    o graphical LCDs: use 55 (like a Logic Control)
					;    o one 2x40 LCD: use 40  (unfortunately..)
					;    o two 2x40 LCDs: use 55  (like a Logic Control)

#define INITIAL_DISPLAY_PAGE	0	; initial display page after startup (choose your favourite one: 0-3)

What have i forgotten?

Thanks!

redagrds, mischa

19

I have played with these values and the screen changes accordingly, but I never get a “graphical” screen.

So you get text messages on the LCD, but no graphical representation of the knob? Does it look like this?

Best regards, ilmenator

20

Nope, it looks like this: