Graphics animation with HD44780 Char LCD :)

[@rt]

Hi Guys
Source has been requested for this repeatedly, and I’ve gotten to splitting the graphics
routines out of the larger program they were written for.
In fact, the text transition source is ready to go now.

So when is a character display a graphics display?

Graphics:


Text Transitions:

[Kilrah]

Very nice!

[bitseeker]

Source may have been requested repeatedly, but this is the first time I've seen this level of animation on a character display. Very cool!

Is the animation completely arbitrary (i.e., pixel-level control from code) or are all the frames pre-defined "characters"?

[@rt]

Hi, It was on Hackaday a while back and got some exposure there.

The graphics and text transitions are very different programs.
ie. the source for one would not be of much help for someone writing the other.

The graphics is pixel level double buffered display, and arbitrary drawing,
where the LCD RAM of course provides the video RAM, and the drawing buffer is in the micro.
There is also a fairly complete 2D library for lines, boxes, circles, eclipse, etc.
The custom characters are rewritten for every frame.

Much earlier I got this done which looks nicer, but revisited it when I started writing for dsPic,
and had floating point math to do point rotation, etc. ... which is why there’s a lot of rotation in the later one

[bitseeker]

Ah, I see. Thanks for the quick summary. I have a 20x4 display somewhere around here that might be fun to play with.

[@rt]

Hopefully this SourceForge account worked, and this should be the main.c file for text transitions.
It can be blocking or non-blocking.
https://sourceforge.net/projects/lcd-transitions-hd44780/files/LCD_Transitions.txt/download

Goes in as the main.c file for Microchip C30 timer example for dsPic.

[bitseeker]

Thanks, rt. Download worked fine. Looks like there are some fancy (non-ASCII) quote and apostrophe characters in the four sprintf() at the beginning of main(). Doesn't occur elsewhere.

[Delta]

What a completely pointless project.  I love it! :-)

[crispy_tofu]

Very cool. 

[@rt]

Thanks for the compliments

bitseeker, I’m glad you got it working So I can forget about it and go on with the next bit.
The non-ascii, so long as it’s the quotes that belong there I’m sure everyone will figure it out who tries.
It was written in MPLAB, so I wouldn’t have expected anything funny

Code: [Select]

main() {

sprintf(line1,”INITIAL LINE ONE    ”); // made for 20 char display so the four extra spaces should be left
sprintf(line2,”LINE TWO INITIAL    ”); // at the end until it’s tested with them removed
sprintf(line8,”  NEW LINE ONE      ”);
sprintf(line9,”!!!!!!!!!!!!!!!!    ”);
//

Some new inserted chars just now.. “”””””’’’’’ ‘’’’ ‘’’’ Maybe a Mac OS thing?


If you got it sorted so easily you’d probably easily figure out how to interleave it with other program code rather than blocking (if needed).

[@rt]

Anyone from YouTube or elsewhere I’ll send here now BTW, the next code link will end up here too.

So...  I give up all rights to both sources (when the next one is posted) Public Domain for use as is, or with any modification.
If you make a million out of a commercial product though, the least you could do is give me a sitting down job at a desk with a window
Brek Martin.

[bitseeker]

Thanks, Brek. I just figured I'd mention it in case anyone does a search.

[@rt]

Haha.. I had just the right project to try a basic oscilloscope



Not bad for a 16F628A. The timing of the output for the relay has priority to drawing,
and is done in the same timer interrupt routine that counts 100th of a second.
Other than in pulse mode, there’s nothing to tie a rising edge to the beginning of a second so it’s correct for the waveform to walk.
Cheers, Brek.