Protocol decoder:rgb_led_spi
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 | |
| Name | RGB LED (SPI) |
|---|---|
| Description | Generic RGB LED string protocol (RGB values clocked over SPI) |
| Status | supported |
| License | GPLv2+ |
| Source code | decoders/rgb_led_spi |
| Input | spi |
| Output | rgb_led_spi |
| Probes | — |
| Optional probes | — |
The rgb_led_spi protocol decoder supports various LED controllers that get RGB color data via SPI in 24bit chunks (3x 8bit SPI words).
Hardware
WorldSemi WS2801 based led string
The led/ws2801 directory in sigrok-dumps contains a set of example captures of the data for a WorldSemi WS2801 based LED string.
The logic analyzer used was a Saleae Logic16 (at 5MHz).
Probe setup:
| Probe | WS2801 |
|---|---|
| 1 (black) | UNI1 |
| 2 (brown) | CLK |
Protocol
The protocol is SPI-based and expects 24bit RGB values, i.e. 3 SPI words of 8bits each.
Since only one direction is needed in some cases, it is sufficient to have the CLK and (e.g.) MOSI SPI line available.