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authorGerhard Sittig <gerhard.sittig@gmx.net>2023-07-29 16:59:43 +0200
committerGerhard Sittig <gerhard.sittig@gmx.net>2023-07-29 21:29:11 +0200
commit17b2579a517489ce06756943529986921e194ef9 (patch)
treeceeaeb0b2f47d635ad01b2c64960edade1b89d49 /decoders/usb_signalling/pd.py
parent5e8090d7d30fb0915fc1b54f3ec098c69a417745 (diff)
downloadlibsigrokdecode-17b2579a517489ce06756943529986921e194ef9.tar.gz
libsigrokdecode-17b2579a517489ce06756943529986921e194ef9.zip
rgb_led_ws281x: support more colour component orders (wire, and text)
The 'type' option was not good enough. Replace it by 'wireorder' (order of colour components on the wire, depends on the RGB LED chip type), and 'textorder' (presentation to users in annotations). Support many more layouts of colour components on the wire. Cover all permutations of R, G, and B. Support a few RGB plus W layouts that are known to be in use. Adding more is just a matter of adding more choices in the option, the implementation transparently follows. Support a few text orders: Reflect the very order of bits on the wire. Automatic support for RGB with optional White, or fixed RGB or RGB-W variants (all are users' choices, default remains "RGB" for backwards compatibility). Support arbitrary combinations of wire order and text order in emitted annotations. Keep support for the weird RGWB text format, which the previous decoder implementation used for "all" RGBW types, and which is referenced by existing test cases. It is uncertain which chip type is supposed to generate this specific RGBW traffic. It is as uncertain why this text order was chosen, which neither is the human readable RGBW format nor matches the wire order. The previous implementation was introduced in commit 47ff9910f7e1, but neither commented nor referenced literature or external sources nor did the commit message contain any clues. This current implementation needs more tests and reviews, but lends itself better to maintenance, fixes and enhancements.
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