Repetitive pattern on GLCD

[temtronic]

One way to get it 'up and running' is to eliminate ALL the font tables except for ONE. I don't know how many there are but each must be fairly large. By having only ONE font table, it should be possible to get the code working at least to bench test.

Jay

[jamalavedra]

Do you guys have any idea on how to modify the attached code in order to only clear a specific area of the display and not the whole screen? I have tried several times but haven't successfully found a solution.

[Ttelmah]

Normally you draw a filled rectangle with a 'clear' fill.

The bulk clear has to work to byte boundaries, so it can't clear a 'generic' area. However provided you are happy to only clear to such boundaries, you'd have to feed it a value to start from in each direction (would replace the '0' in the counters), and a place to end in each direction (would replace the 'SCREEN_WIDTH', and 'SCREEN_HEIGHT' values). Will be a lot bulkier code though (because the calculations can't then be done by the compiler).

[temtronic]

Without having that GLCD here to experiment with, I'd say your code is really two sections.
The first appears to clear the internal GLCD's RAM 'buffer', the second clears the actual display(what you see).

I would suggest that the datasheet for that GLCD has the 'layout' of the actual pixels, probably starting at the upper left as 0,0---lower right as c,r where c is the max column and r is the max row.
To erase (clear) a 'section' of screen you need to know the coordinates of the four corners, then simply clear each pixel within those boundaries, by having two counters (xpos, ypos) that increment between the 'four corners' and reset the pixel (clear).
I'm sure there's a lot of info on the web about your GLCD. If you get really stuck, consult the MS QuickBASIC 4.5 book. They have a whole chapter devoted to 'graphics'. I know BASIC, but the underlying principles of set/reset - on/off ,x,y - r,c are applicable.

Without your GLCD I can't cut/compile/test code.

Jay

[jamalavedra]

The problem is that with this "blank display" code that I have shared doesn't allow to blank neither the display not the buffer in random square locations of the display, as it isn't meant for that, and I don't know how to ie., clean the display in a square that isn't near the x=0 and y=0 location.
thanks
jaume

[temtronic]

Honestly you have to read the GLCD datasheet. What you're asking for must be there, as it's a basic function of the GLCD to turn a pixel on or off. Cutting code(aka driver fucntion) is mearly an implementation of the basic GLCD functions.
Since I don't have that GLCD, I can't try any code that I suggest 'should' work.

However as I pointed out is it possible to 'select' and are bounded by x0,y0-x1y1 and 'erase' all the pixels inside.

Jay

[PCM programmer]

Just use a text search engine on the files in the CCS drivers directory on
your PC. Search for 'rectangle'. You will find a few functions that
draw a filled rectangle with the specified color.
Here is the glcd_rect() function in graphics.c:

[jamalavedra]

[temtronic]

graphics.c is in the drivers folder as someone else already said. No one here can give it to you(against policy) but simply contact CCS with your compiler type/version/serinal number and they will send you the file.

Jay