Author Topic: Oberservation - Refresh  (Read 4843 times)

Offline JonB256

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Re: Oberservation - Refresh
« Reply #15 on: February 17, 2015, 12:14:11 PM »
I ordered some p10 panels thru Ray Wu, along with some other items (TM1804 pixels). He is not the cheapest but is such a reliable vendor I wanted to see if his panels are equal. Time will tell. Specs are identical.  Pictures were similar, but I've learned not to explicitly trust Aliexpress pictures.
« Last Edit: February 17, 2015, 12:24:40 PM by JonB256 »

Offline twooly

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Re: Oberservation - Refresh
« Reply #16 on: February 19, 2015, 09:51:08 AM »
Just as a test I connected a panel up to another pi.  This time a B+ and seeing the same results.  Weird, guess it will motivate me to get a board setup to remove the jumper cables.

Offline CaptainMurdoch

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Re: Oberservation - Refresh
« Reply #17 on: February 19, 2015, 11:33:09 AM »
Just as a test I connected a panel up to another pi.  This time a B+ and seeing the same results.  Weird, guess it will motivate me to get a board setup to remove the jumper cables.

Can you watch the video for Adafruit's Pi Hat that uses their patched RGBMatrix library to drive P10 panels?

https://www.adafruit.com/products/2345

Specifically the spectrum analyzer part near the end. Does this look comparable to anything you are seeing with the RGBMatrix support in FPP?  I am seeing some refresh artifacts on whole lines that appear to be in their video as well.  I think this may be limitations due to implementing the refresh in software instead of a PRU like on the BBB or the FPGA like what David planned for the Falcon Neo on the Pi.
-
Chris

Offline twooly

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Re: Oberservation - Refresh
« Reply #18 on: February 19, 2015, 12:43:53 PM »
Yep I do see full lines going up/down .  You can kind of see it in my video, same thing on both a B and B+

Offline CaptainMurdoch

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Re: Oberservation - Refresh
« Reply #19 on: February 19, 2015, 01:03:22 PM »

Yep I do see full lines going up/down .  You can kind of see it in my video, same thing on both a B and B+

Ok, so that confirms it would not be fixed by just adding a level shifter since their board has one.  Their github fork of the RGBMatrix code does have a new commit in it related to timing on the Pi 2 B so I may try that out sometime after hacking it to use the original pin out.  One if their changes to the library is to use a different pin out than the original code so their board is not compatible with FPP code at this time.

Offline JonB256

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Re: Oberservation - Refresh
« Reply #20 on: March 03, 2015, 08:51:25 AM »
I'll add here that Twooly tried the same thing on a BBB output and is not seeing the shimmer.

http://falconchristmas.com/forum/index.php/topic,2295.msg24848.html#msg24848

Offline twooly

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Re: Oberservation - Refresh
« Reply #21 on: March 03, 2015, 09:07:04 AM »
Thanks, yep no shimmer on the BBB output

 

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