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Send image to LCD?

 
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sf



Joined: 02 Jul 2007
Posts: 9

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Send image to LCD?
PostPosted: Sat Jan 26, 2008 8:25 am     Reply with quote
Hi, to send a image i use this in lcd driver:
(using the GCLCD TODOPIC generator)

Code:

void    Lcd_image(int x, int y, int16 * img)
{
   Int16   col, row, pWidth, pHeight;

   pWidth  =img[0];
   pHeight =img[1];

   for(row=0;row<pHeight;row++)
      {   
         for(col=0;col<pWidth;col++)
         {
            LCD_Pixel(col+x,row+y,img[col+row*pWidth+2]);
         }
      }   
}


And in the main program:

Quote:


int16 imagem[200] = {
0x10,0x20,
0x1234,0x3eff,0xffee,.................
};

Lcd_image(10, 10, &imagem[0]);



Work´s perfectly,

But, and if i want to do this:

For this type of image:

Quote:
STATIC CONST UNSIGNED INT16 face_cool [1026]={ image data};


How can i use the LCD_image() to send the image to LCD? since i can´t use &face_cool[0]

there is any tip or i have to change the way to send to LCD (void Lcd_image(int x, int y, int16 * img)


Thank´s on advance.

Note: And if i store the data on external eeprom?????
treitmey



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

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PostPosted: Mon Jan 28, 2008 8:57 am     Reply with quote
Perhaps you could copy the const to ram first.
then you can use the pointers.
Douglas Kennedy



Joined: 07 Sep 2003
Posts: 755
Location: Florida

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PostPosted: Mon Jan 28, 2008 9:20 am     Reply with quote
The issue with images is that they take up space. Most images have pixels that are next to each other and that are the same. Look at run length encoding. With a PC preprocess the image and run length encode the image.A map in black and white will compress a great deal. With the PIC write code to unpack the image directly to the LCD in that way memory is conseved as well as eeprom space since a compressed image is stored.
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