Falcon Christmas

Falcon Player (FPP) => Falcon Player (FPP) => Topic started by: tfmacz on September 20, 2022, 11:44:21 PM

Title: FPP Custom HomeMade PiHat for Pi B RevB with 26 Pin GPIO Header
Post by: tfmacz on September 20, 2022, 11:44:21 PM
I Have a number of Raspberry Pi B with the 26 pin GPIO Header.
I will hand wire a custom Pixel String PiHat to fit these.  The GPIO Header does not have GPIO19 for the second string.  It is not convenient to put both models on a single string.  They a only 100 Pixels each but some distance apart.  How can I change the Pixel string output pin in the GPIO Header to something that is available on the 26 Pin Header?

If I buy a 2 pin DPIPixel-24 license can I change the pins there?

Thanks 
Ted
Title: Re: FPP Custom HomeMade PiHat for Pi B RevB with 26 Pin GPIO Header
Post by: bloojoop on September 21, 2022, 12:18:54 AM
the standard output type uses hardware PWM which is only available on GPIO 18 ad 19.  Cannot get a second port using that output type.  Using the DPIPIXEL output type, you can define your pins by building a custom virtual EEPROM that defines what pins are used for which ports.  There likely would be instructional help in the fpp github page regarding custom eeproms.  I don't think DPIPixels was test on a PI B and it is very dependent on timing and uses the video frame buffer and the GPU so it may not even work on a PI B.  If it did and you wanted to use that output type, it would require a license to enable more than 50 pixels per port. 
Title: Re: FPP Custom HomeMade PiHat for Pi B RevB with 26 Pin GPIO Header
Post by: tfmacz on September 21, 2022, 03:52:11 PM
Could you provide a bit of help in where to look for info on creating a "custom virtual EEPROM"?  If I can get it to use a different pin I can test if it might work at 50 pixels.  If so It would be worth the $5 to buy a 2 port license to test further.

Thanks
Ted.
Title: Re: FPP Custom HomeMade PiHat for Pi B RevB with 26 Pin GPIO Header
Post by: bloojoop on September 21, 2022, 04:53:08 PM
It's a bit technical for sure and I have not done it. I would search in the github repository... there are some docs samples about eeprom structure.   
Title: Re: FPP Custom HomeMade PiHat for Pi B RevB with 26 Pin GPIO Header
Post by: tfmacz on September 21, 2022, 06:03:35 PM
Thanks.  I have been searching through the git repository.  I have found the eeprom.txt explination of the eeprom structure.  it's the extra code that I am trying to decipher.  You suggest the gpio pins are in there somewhere.
Title: Re: FPP Custom HomeMade PiHat for Pi B RevB with 26 Pin GPIO Header
Post by: tfmacz on September 22, 2022, 11:56:55 PM
As it turns out.  If I use the DPIPixel output type. Pay for an 8 port license.  I can use at least 6 ports with the standard GPIO header assignments.  So far, 300pixel strips are behaving.
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