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Messages - Rudolph

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31
General Discussion / Re: FT82x
« on: May 21, 2018, 03:19:45 PM »
Adding to this, the 2000 entries in the display list is not the only limitation I am wondering about.

I did some profiling and found that VERTEX2F is a huge bottleneck because of the odd positions the X corrdinate has to be shifted in.
This is a major pain when working with calculated coordinates.
Especially with 8 Bit controllers which kind of are the designated target for the EVE series.
But this also has to have some impact on 32 bit controllers.
I would apreciate a command that at the cost of one bit resolution has the X coordinate not shifted.
Or heck, make that two bits shorter and 1 pixel resolution by default, that would be a range of +/- 4096 to set.

I also would not mind patching VERTEX2F for a faster operation of the FT81x but FTDI/Bridgetek would need to supply such a patch as the inner workings of the FT8xx are only partly explained.

What also is very slow is PNG support in FT81x.
I clocked a simple test picture with 3867 bytes to take 53ms for processing after sending the data.
While a JPG with 3903 only needed 480µs to process.
That means JPG is 110 faster than PNG.
Maybe this is the reason why PNG is missing from the table at http://brtchip.com/bt81x/ ?

Also I am wondering why the BT815/816 datasheet has not been updated so far with a release due next month.
The draft version really has nothing new so far, at least not in any detail.

Even more I am wondering why the FT81x programmers guide is not getting any updates despite the numerous bugs it contains and of which I reported some over a year ago.

And am I the only one wondering why the next device is named BT816 instead of BT814? :-)

32
New Member Introductions / Hello
« on: May 21, 2018, 02:34:11 PM »
Hello,

my name is Rudolph Riedel, I am from Germany and I am playing with a whole bunch of different EVE FT8xx display for over 2 1/2 years now which resulted in a free driver on Github: https://github.com/RudolphRiedel/FT800-FT813

And while I know that technically Bridgetek took over the EVE activties they do not have a forum so far.
Plus their EMEA support has the same address as FTDI, only with a different mail-address.

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