GLCD (Wayton MG1206E) CS1 CS2 polarity ...

granddad · May 17, 2017

I had this 2.5” 128x64 GLCD (WAYTON MIT MG1206E SGL) in my parts box , and in a crazy moment I thought I would see if it worked ( It was from a Maplin grab bag of led / lcd junk) , found some data on the www and lashed up a test bed, having realised graphics LCD require big-ish data squirted at them I used a dsPIC33EV256GM104 it is has 16k ram available. ( no details of the 20 pins on the pcb ) several days later ….. success. Well some lines on the screen, seems NT7108 / KS0108 controllers are not all the same, this one has a high level CS1 and CS2 ,( Left and right side controllers) not seen any mention of this on the files / posts found on the web. So though I would share. My intention is to write fonts / graphics into an array in PIC memory and just display that….
( colours are just my BB wire reference ).

Pommie · May 17, 2017

Not sure if it's useful or not but attached is some code I wrote about 10 years ago for one of these displays.

Mike.

Ian Rogers · May 18, 2017

Wow Mike... That's what I call a concise library.. Mine is half that size.. I do, however, use a double buffer, so alot of my code write's are to the spare canvas...

Well done though!!

granddad · May 18, 2017

Thank you Mike, I'm getting to understand the GLCD controller ( possibly ! )
.

Pommie · May 18, 2017

I particularly like the circle routine because it completely baffles people how it works.

Code:

void Circle(unsigned char cx,unsigned char cy,unsigned char r){
    unsigned char x,y,p;
    x=0;
    y=r;
    p=-r/2;
    while(x<=y){
        Plot8(cx,cy,x,y);
        x=x+1;
        if(p>128){
            p+=2*x+1;
        }else{
            y--;
            p+=2*(x-y)+1;
        }
    }
}

Mike.

Ian Rogers · May 18, 2017

Pommie said:
I particularly like the circle routine because it completely baffles people how it works.

If you come across a simple arc routine, let me know..

Pommie · May 18, 2017

The way the circle routine works is the same as those nail and string curved paterns. The axes are at right angles in the circle case and a quarter circle is generated by working along "the nails". Using lines at different angles and lengths should give various arcs.

Mike

Ian Rogers · May 18, 2017

Pommie said:
The way the circle routine works is the same as those nail and string curved paterns. The axes are at right angles in the circle case and a quarter circle is generated by working along "the nails". Using lines at different angles and lengths should give various arcs.

Mike

I know.... But a arc could cross the 90 degree, that means the 8 point routine won't do the job.. So if you come across one!! I have written one, but it's a little slow, too many iterations... if this and if that!! Ill convert it to asm to see if I can boost the speed..

atferrari · May 19, 2017

granddad said:
I had this 2.5” 128x64 GLCD (WAYTON MIT MG1206E SGL) in my parts box , and in a crazy moment I thought I would see if it worked ( It was from a Maplin grab bag of led / lcd junk) , found some data on the www and lashed up a test bed, having realised graphics LCD require big-ish data squirted at them I used a dsPIC33EV256GM104 it is has 16k ram available. ( no details of the 20 pins on the pcb ) several days later ….. success. Well some lines on the screen, seems NT7108 / KS0108 controllers are not all the same, this one has a high level CS1 and CS2 ,( Left and right side controllers) not seen any mention of this on the files / posts found on the web. So though I would share. My intention is to write fonts / graphics into an array in PIC memory and just display that….
( colours are just my BB wire reference ).

View attachment 106034
View attachment 106031

Long time I do not use one of these. From what I recall, not all manufacturer use CS1 ans CS2 in the same way. Besides the allocation of pins, that is what distinguish GLCDs from each other.

atferrari · May 19, 2017

Hola granddad,

I inherited from a failed replacement (difference in pins allocation) a brand new one.

After searching for the datasheet of a quickly vanished manufacturer in Brazil, I realized that there were kind of discernible patterns among the variation for different brands.

I finally compiled the data from several tens of datasheets and based on the pins allocated to power I could use mine successfully. The data is shown in the attached pdf. With my "electronic" PC down, it is good I got a proper back up handy. Hope you can wade through it.

One day I should post my implementation of the John Conway's game "Life". A piece of judicious programming I enjoyed much. Really.

¡Buena suerte!

granddad · May 19, 2017

Thank you at , let wading commence...

granddad · May 22, 2017

Mike, Not copy and paste of your code , but got lots of help etc, understand the true type working , just have to reinvent it for my project... Cheers.

granddad · May 26, 2017

I now have 2 more 128x64 GLCD modules to play with , a Winstar , ( blue white) , 15GBP from Rapid and an 'unknown' from China ( cheap) , this last one looks interesting, seems to be similar to the character (HD44780) LCDs , the single controller (ST7920) can do 8 bit or 4 bit parallel , or serial ... (SPB pin) and has build in character font .

Pommie · May 26, 2017

Looks like good progress. I notice the odd spacing on the font above. I used a 5 byte wide proportional font and used 0x55 for bytes that should be ignored. If you modify your code it should look a lot better.

Mike.

granddad · May 27, 2017

0x55 = Got you Mike .. Lashup has condensed to 28pin dsPIC33EV , but could do with some spare I/O pins , I was planning to take GLCD RST to Vdd and W/R to Gnd. as I don't think I need to read the display ram or busy status.. ? appreciate your ( anybody's) input ....

Ian Rogers · May 27, 2017

I normally preset both CE and RST.... I do use the w/r....

atferrari · May 27, 2017

For 2x16 and 2x20 LCDs I use a fixed delay, so no check of busy condition. Pin is, IIRC, grounded.

granddad · Jun 8, 2017

Moved up to the larger Winstar 128x64 blue display, and thanks to Pommie Mike's file , have the basics working , with RST at Vdd and R/W to gnd . Invert options and font spacing sorted, the dsPIC33 , works well only used 2% of program space ... also have a few pins to play with .

Pommie · Jun 8, 2017

Looking good. The main drawback with those displays is there speed. If you update a value every 0.5 second it becomes unreadable. Shame really as they are otherwise very useful.

Mike.

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