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PI zero pixel drive board

Started by ronp, December 20, 2015, 06:12:33 PM

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I'm having trouble correlating the info in the FPP help file to the hardware I have. The help file segment is below. What I have is the PI that is labelled as 2B in the below attachment. I can see A+ and B+ on the picture but nothing that is labelled as B V2 that has 40 pins. As I can't currently get my 2nd data string going I'm guessing it's because I have the wrong variety of PI but as I can't match info up I'm not sure.

RPIWS281X - The RPIWS281X output can drive two independent strings of WS281x pixels directly off the Raspberry Pi's GPIO ports. The data and ground lines attach directly to the Pi while power for the pixels is injected from another source. NOTE: When you enable the RPIWS281X output, the onboard audio on the Pi will be disabled since both audio and RPIWS281X need to use the same PWM output.
RPIWS281x Output Connections
WS281x Function    Raspberry Pi
Data String #1    Pin 12 - GPIO18
Data String #2    Pin 35 - GPIO19 (Only on A+/B+/B v2)


Sometimes the v2 is referred to as the B v2 and sometimes it is referred to as the Pi 2 B.  I think that's what the label on the board shows, so we probably should refer to it that way on here.

Either way, all of the pins we are dealing with here are the same except the second WS281x output which only exists on the newer boards with 40-pin headers.


So what cases are people using for pi's with add-on boards?


Quote from: robj on May 24, 2016, 04:53:32 PM
So what cases are people using for pi's with add-on boards?

Cases??  :)

2-4 screws is all you need or if you want to use a case just use the case bottom and leave the top off.


Sequencers: Vixen3 and xLights
Players: FPP and xSchedule Controllers:  Renards - SS24/SS16; E1.31 - San Devices E682 - Falcon F16, F4, F48 - J1Sys - DIYLEDExpress E1.31 Bridges.  Much more!


Quote from: ronp on May 01, 2016, 03:29:34 PM
0x01 - Falcon.F16V2-alpha
0x02 - Falcon.F9DV1

0x03 - Falcon.FPDV2

I replied to your PM a few days ago, but we can continue the discussion here if that's fine with you.


Thanks for the reply, I have been busy lately.

An ID of 0x81 works for me. If you change the spi clock to 16Mhz, then I know it worked. Please let me know which version of test software or you want a controller for testing.



I will update master and get this pushed in the next set of binaries for FPP v1.8.


I finished the FPGA for the SPI to pixel converter, that supports driving 16 outputs. The FPP version I used did not appear to ID the board correctly (V1.8-18-ged1f3c2).

Enclosed is a picture of all of the SPI activity on a PI at power up. This only includes the first 8 bytes of each transmission. Note at the end the ID (00), followed by the zeroing of DMX(55) and pixelnet (CC). The SPI on the PI is funny to me, since the controller needs to send at least a byte before the slave can properly respond. If I have no data, I can't figure out what to send.

Anyway, I put in my firmware to send 0x81 hex for the first byte, followed by all zero's. This occurs on the first byte after the chip select for all messages.

I am content with the no ID on this board, since 8192 channels only takes about 8mS to send at 8Mhz.


I don't think I added the new ID yet.  I will try to get that into v1.8 this weekend with the speed set to 16.

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