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Thread: How many pixels can the FPP control with a pi hat

  1. #11
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    Default Re: How many pixels can the FPP control with a pi hat

    Dang it now. I was all set to order my second set of PiHats.
    Now I'll have to wait for the newer version. (Actually, I could really use the 3 outputs.)

    Any idea as to approximately when?
    "Never Give Up. Never Surrender!"
    Capt Tagert - Galaxy Quest.
    Al Gerdes - Christmas Lighting Nut!

  2. #12
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    Default Re: How many pixels can the FPP control with a pi hat

    No, because it's up to Dave to redesign the Falcon pihat. I wrote the driver for the third output and submitted it to FPP devs.

    I don't expect it anytime soon but if you can hold off he might pull it out before the Season gets too close.
    www.billporter.info
    2014 Christmas: 1 Channel; a new house and a crazy plan.
    2015 Halloween: 2500 Channels; 3 songs. Christmas: 4500 Channels; 6 songs. Custom Wifi Pixel/Renard Controllers
    2016 Halloween: 6500 Channels; 4 songs. Christmas: 11,000 Channels; 4 songs.

  3. #13
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    Default Re: How many pixels can the FPP control with a pi hat

    Define, "too close".

    Right now patience and waiting are not my strong suite. I'll try to improve.
    "Never Give Up. Never Surrender!"
    Capt Tagert - Galaxy Quest.
    Al Gerdes - Christmas Lighting Nut!

  4. #14
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    Default Re: How many pixels can the FPP control with a pi hat

    curious....on the third output. What pin are you using? Jer wrote the original code and it used the two hardware PWM channels, so how are you doing the third? I could spin my board pretty quick if there is interest.

  5. #15
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    Default Re: How many pixels can the FPP control with a pi hat

    There is interest

  6. #16
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    Default Re: How many pixels can the FPP control with a pi hat

    I've yet to hear back what pin the OP is using for the third channel. The Pi only has two PWM channels, and these are being used to generate the data. I have my reservations if a third channel is actually feasible.

  7. #17
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    Default Re: How many pixels can the FPP control with a pi hat

    My pluggin is checked into the FPP github and there's a several pages of development on the Falcon forum. You are welcome to test it yourself.

    Sent from my Nexus 5X using Tapatalk
    www.billporter.info
    2014 Christmas: 1 Channel; a new house and a crazy plan.
    2015 Halloween: 2500 Channels; 3 songs. Christmas: 4500 Channels; 6 songs. Custom Wifi Pixel/Renard Controllers
    2016 Halloween: 6500 Channels; 4 songs. Christmas: 11,000 Channels; 4 songs.

  8. #18
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    Default Re: How many pixels can the FPP control with a pi hat

    I've asked what pin the 3rd output is on, and nobody seems to know. The Pi uses the two hardware PWM channels, based on the code Jer wrote, so I'm still waiting to find out where the 3rd is coming from? I'll be glad to update my PixelPi board to support 3 channels once I know it actually works.

  9. #19
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    Default Re: How many pixels can the FPP control with a pi hat

    It appears to be the first spi interface? I can't seen to track down the code right now. The posts appear to in the running on other hardware thread? Have to know the mode apparently as different pins are used depending on mode. My guess is pin 12 - but I think MadSci1016 could clear that up pretty quick.

  10. #20
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    Default Re: How many pixels can the FPP control with a pi hat

    Yep. It works by using the SPI port to emulate WS281x signals. I've tested 3 strings of 500 pixels each with no issue.

    My driver code is sitting in a pull request for the main development branch of FPP. Means unless I (or someone else) take the time to back port it to the 1.5 branch it won't be included until 2.0 is released.

    You can test it by compiling FPP from my fork on Github. I go by the same username there as here.

    Sent from my Nexus 5X using Tapatalk
    www.billporter.info
    2014 Christmas: 1 Channel; a new house and a crazy plan.
    2015 Halloween: 2500 Channels; 3 songs. Christmas: 4500 Channels; 6 songs. Custom Wifi Pixel/Renard Controllers
    2016 Halloween: 6500 Channels; 4 songs. Christmas: 11,000 Channels; 4 songs.

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