I've got 4 input channels, each is physically attached to 1 GPIO pin and handled by 1 SM in PIO0.What exactly the conversions mean, and what kind of data you receive on the 4 input channel ?I've been building a WS2812B hub/multiplexer using a RP2040 (125MHz) that can receive input on 4 channels and transmit output to 16 channels.
Ideally, I want my rx and tx loops to handle all the WS2812B-data to multi-byte-pixel conversions and multi-byte-pixel to WS2812B-data conversions asynchronously via DMA & PIO only, so that the cpus have enough cycles remaining to intelligently route/process segments of the input channels' pixel data to the appropriate output channels.
The 16 output channels are physically attached to GPIO pins 8 to 23 and handled in groups of 4 pins per 1 SM in PIO1.
WS2812B-data refers to the 800Kbps data signaling used for WS2812B (GRB) and compatible SK6805 (GRB) / SK6812 (RGBW) addressable led strips. (see embedded links <-- for spec sheets)
multi-byte-pixel refers to the GRB 3-byte pixel data and RGBW 4-byte pixel data sent via this WS2812B signaling, being stored in SRAM buffers, and then processed by the CPUs as pixels.
I was looking for an excuse to get some experience with the RP2040 and I found one.Say [4 x WS2812B format input stream] --> [pico] --> [16 x WS2812B format output stream]
Why would anyone want to handle upstream data as WS2812B format...![:|]( "Neutral")
My computer case "needed" some RGB bling, and as I added addressable ARGB kits here and there for the pumps, plates, and fans, etc, I quickly found out that most-all off-the-shelf ARGB kits have zero provisions for daisy chaining their individual ARGB segments. This is unfortunate since my motherboard provides just 1 ARGB header while my video card also provides just 1 ARGB header. Both of these ARGB sources have hardware to make pretty blinken-lights while also color encoding some hardware state information like CPU temps etc. While there are some off-the shelf ARGB controller/hubs out there, none did what I wanted. So my RP2040 project was born. I designed/built a custom FeatherWing PCB for the Adafruit Feather RP2040 SCORPIO board to get 16 ARGB output headers, and I can now read the two ARGB data streams from both my motherboard and my video card and then arbitrarily map their pixel data onto all of my separate kits' individual ARGB led segments.
Statistics: Posted by steffenyount — Fri Dec 20, 2024 7:13 pm