Increase Page Buffer Size for ST7920 (was: Enhancement: framebuffer)

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Enhancement: it will be great to add ability to use a framebuffer in ram 
instead of "picture loop". I use mega2560 it has enough ram (8k) but in my 
project "picture loop" is too slow.

Original issue reported on code.google.com by dzmitry....@gmail.com on 15 Jan 2013 at 10:33

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Thanks for the issue. 
However, the picture loop is a basic feature of u8glib. In fact u8glib has been 
build around the picture loop. Replacing the picture loop with a frame buffer 
would mean to write a complete new library. A Framebuffer is can not be an 
enhancement. Its a new lib.

This topic has been discussed in much more detail here:
http://arduino.cc/forum/index.php?&topic=91395.90

What i can do: I could extend the page buffer for specific displays for speed 
up.
To do this, i need to know which display you use.

I am sorry that i can not implement this.

Oliver

Original comment by olikr...@gmail.com on 16 Jan 2013 at 5:43

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Oliver,
Could you make parameter "page buffer size" configurable?

Original comment by dzmitry....@gmail.com on 16 Jan 2013 at 10:32

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Oh, I forgot, I use ST7920.

Original comment by dzmitry....@gmail.com on 16 Jan 2013 at 10:38

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What i can do, is to increment page size for ST7920, so that the number of 
iterations gets reduced for the picture loop.

Original comment by olikr...@gmail.com on 16 Jan 2013 at 11:22

• Changed title: Increase Page Buffer Size for ST7920 (was: Enhancement: framebuffer)
• Changed state: Accepted
• Added labels: Milestone-1.10, Type-Enhancement
• Removed labels: Type-Defect

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Original comment by olikr...@gmail.com on 16 Jan 2013 at 11:22

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How big can you make the page buffer?

Original comment by dzmitry....@gmail.com on 16 Jan 2013 at 11:51

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Usually i implement a device with doubled memory, but also 4x or 8x page size 
is possible (also requires more programming effort). In fact i could increase 
it up to the frame buffer size, but only for individual graphics devices. But 
picture loop will still be there.

I would suggest to implement doubled memory and let you decide if this is 
sufficient for your speed requirements.

Original comment by olikr...@gmail.com on 16 Jan 2013 at 12:04

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One more question: What are your screen dimensions? 128x64?

Original comment by olikr...@gmail.com on 16 Jan 2013 at 12:05

[GoogleCodeExporter]

I would be appreciated if you increase page buffer size up to frame buffer 
size. And yes I use ST7920 128x64.
Thanks for your help.

Original comment by dzmitry....@gmail.com on 16 Jan 2013 at 12:23

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Original comment by olikr...@gmail.com on 27 Jan 2013 at 6:44

• Added labels: Milestone-1.11
• Removed labels: Milestone-1.10

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current memory architecture is pb8h1. pb16h1 exists

Original comment by olikr...@gmail.com on 24 Feb 2013 at 10:42

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added pb32h1

ToDo
- constructor update
- testing
- port to 128x64 
- dev table update

Original comment by olikr...@gmail.com on 27 Feb 2013 at 9:22

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fps:
  ST7920_192X32_1X, SPI:    FPS: Clip=10.3 Box=5.5  @=7.2 Pix=3.9               
  ST7920_192X32_4X, SPI:    FPS: Clip=10.9 Box=6.7  @=8.8 Pix=7.4
  ST7920_192X32_1X, 8Bit:    FPS: Clip=14.2 Box=6.1  @=8.4 Pix=4.2               
  ST7920_192X32_4X, 8Bit:    FPS: Clip=14.2 Box=7.8  @=10.7 Pix=8.7

ToDo
- port to 128x64 (and the 202...device) 
- dev table update

Original comment by olikr...@gmail.com on 2 Mar 2013 at 7:53

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update:
  ST7920_192X32_1X, SPI:    FPS: Clip=10.3 Box=5.5  @=7.2 Pix=3.9
  ST7920_192X32_4X, SPI:    FPS: Clip=10.9 Box=6.7  @=8.8 Pix=7.4
  ST7920_192X32_1X, 8Bit:    FPS: Clip=14.2 Box=6.1  @=8.4 Pix=4.2
  ST7920_192X32_4X, 8Bit:    FPS: Clip=14.2 Box=7.8  @=10.7 Pix=8.7
  ST7920_192X32_1X, HW SPI:    FPS: Clip=14.2 Box=6.3  @=8.7 Pix=4.3
  ST7920_192X32_4X, HW SPI:    FPS: Clip=15.3 Box=8.0  @=11.2 Pix=9.0

port to 128x64 and 202x32 done

... hope that the 4x mode is fast enough ...

todo: 
device table

Original comment by olikr...@gmail.com on 2 Mar 2013 at 9:43

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todo: document 4x modes in device table

Original comment by olikr...@gmail.com on 2 Mar 2013 at 10:00

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documentation finished

Original comment by olikr...@gmail.com on 2 Mar 2013 at 9:06

• Changed state: Verified