Show Posts - MarkusL

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Messages - MarkusL

Project logs / Re: Controller Board for Adafruit's Large RGB Matrix Display

February 24, 2014, 06:24:41 pm

Of course you can also put it in one library. I just like it when functionallity is seperated: Everything that is directly related to interfacing the panel in one, and helper functions like draw line in another, for example like the adafruit Adafruit_GFX and Matrix libraries. This can make reuse of the parts easier.

Project logs / Re: Controller Board for Adafruit's Large RGB Matrix Display

February 24, 2014, 11:00:46 am

Regarding #define as proposed by lcunha: This would be great. However, I don't think that this is supported in Teensyduino.

Project logs / Re: Controller Board for Adafruit's Large RGB Matrix Display

February 24, 2014, 10:48:01 am

Generally, I'd keep it as simple as possible. Most users just want the RGB-Panel to work, and concentrate on other stuff. The few users who have very specific requirements or like to tweak every byte can just modify the library directly. I'd also keep it lean, just adding basic functions like drawPixel(), everything else like drawText() or drawLine() should be in a separate library.

I'd also choose variant 3. Normally it's great to have a library configurable, for example changing the number of pixels. However, in this specific case, there are only two possible options: 16x32 and 32x32. To my knowledge no others exist. And if there were others, they'd have a completely different interface anyway.

Regarding variant 2: I don't think you can guarantee that the memory allocated with malloc() is in the DMAMEM area, so probably this variant is not optimal.

Variant 1: This is great for LED-strips, because users can have a lot of different sizes. However, the panel only comes in two sizes, so this is not really necessary.

Project logs / Re: Controller Board for Adafruit's Large RGB Matrix Display

February 23, 2014, 05:35:53 am

Nice, much smoother gradients!

In the meantime I have also implemented a 24bit version on the Teensy. So far without using DMA. The trick is to prepare correctly interleaved RGB-buffers in advance. Adding DMA should improve this further. The sourcecode is here: http://forums.adafruit.com/viewtopic.ph ... 54#p253154

Project logs / Re: Controller Board for Adafruit's Large RGB Matrix Display

February 21, 2014, 11:15:32 am

An Arduino has barely enough memory for a single buffer. Therefore there is no double buffering. This should not be an issue with the Teensy, as it has 32 times the RAM.

Project logs / Re: Controller Board for Adafruit's Large RGB Matrix Display

February 21, 2014, 03:17:36 am

[quote author="EmbeddedCreations"] I like the video streaming idea. Do you know how you might stream over USB? [/quote]

I finished the Arduino version http://http://forums.adafruit.com/viewtopic.php?f=47&t=50115, it allows live streaming from the PC screen. The Teensy version will probably be much cooler, because of the better color depth.

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