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Unable to draw line on glcd (T6963 controller)

 
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arunb



Joined: 08 Sep 2003
Posts: 492
Location: India

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Unable to draw line on glcd (T6963 controller)
PostPosted: Wed Oct 21, 2009 7:08 am     Reply with quote
Hi,

PCH: 4.073
I am using a 18F4620 and a 240x128 graphical LCD (type: GDM240128B.....http://www.xmocular.com/upload_img/2007110153232813.pdf), this uses the T6963 toshiba controller.

LCD data port is at portB, the other control pins are connected to portA

I was able to implement Treitmey's driver for the T6963...see http://www.ccsinfo.com/forum/viewtopic.php?t=19957&highlight=graphical+lcd

I also implemented a glcd_pixel() function and was able to do the following

1. set a pixel at each corner of the screen..at (0,0), (239,0), (0,127) and (239,127) etc.

2. Print character at specific locations

3. The example code (drawing a black square) in the driver file also worked

I used the glcd_line() function in the graphic.c file shown below..
Code:

glcd_line(0,0,239,0,0,1);
this drew a line from o to around 20 pixels

glcd_line(0,0,153,0,0,1);
this drew a line from 0 to 103 pixels (ie: 103,0)


strangely the glcd_circle function works very well..also I could set each pixel after 103 to 239 by continously incrementing x position and then calling glcd_pixel()..

Please explain what's wrong...???


thanks
arunb
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Wed Oct 21, 2009 8:27 am     Reply with quote
You say glcd_line function doesn't work.
But you don't show what that function is.
It is not in the link.

Will you show me that code?
arunb



Joined: 08 Sep 2003
Posts: 492
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PostPosted: Wed Oct 21, 2009 11:14 am     Reply with quote
Actually now I am not in my workplace now. The glcd line function can be found in the graphics.c file in the picc/drivers folder.

If you still need that function I can post it tomorrow first thing in the morning.

Is the problem due to the fact that the lcd module is 240x125 and not 240x64?

Thanks
arunb
arunb



Joined: 08 Sep 2003
Posts: 492
Location: India

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RE
PostPosted: Thu Oct 22, 2009 4:27 am     Reply with quote
Ok here is the code for the glcd_pixel function...

Code:

void glcd_pixel(int16 x,int16 y,int1 color)
{
   int8 r=0,c=0;
   c=color;

   r=fmod(x,8);
   glcd_cmd16bits(0x24,GraphicsHome+(y*GraphicsArea+(x/8)));         //set the location
   glcd_cmd0(0xF0|(c<<3)|(7-r));
}


I am keeping MD2, CE and FS low.

I found that to draw a 239 pixel long line (horizontal) I need to draw a line from 0 to 127 and then from 127 to 239, ie : Line1= (0,0) to (127,0) and Line2= (127,0) to (239,0)..the code is given below
Code:

glcd_line(0,0,127,0,1);        //Line 1
glcd_line(127,0,239,0,1);    //Line2


Is the display divided into two screen s of 127 pixels ???
please explain....

thanks
arunb
arunb



Joined: 08 Sep 2003
Posts: 492
Location: India

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Solved...I found the problem
PostPosted: Thu Oct 22, 2009 5:17 am     Reply with quote
Finally I found the problem, I had not defined LARGE_LCD in the graphics.c file.

Thank you treitmey for the help, the driver now works beautifully....

thanks
arunb
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