(ToDo) investigate integration of esp-hub75 (als alternative to MrCodetastic driver)

[softhack007]

Investigate integration of esp-hub75, for driving HUB75 panels

https://github.com/esphome-libs/esp-hub75?tab=readme-ov-file#esp32-hub75-dma-driver

Pro:

• Supports ESP32, ESP32-S2, ESP32-S3,
• Also supports ESP32-C6, and ESP32-P4 (MrCodetastic is still experimental with -P4 support, but nothing usable yet)
• Might be faster
• Might have better color quality / higher brightness
• Has additional API calls to transmit a complete framebuffer (or pixel range) in "one shot" - very fast
• API looks "comparable" to our current driver
• Supports double buffering in PSRAM (no additional leds[] buffer needed on WLED-MM side)

Con:

• Not clear yet how the library handles chained panels, could be incompatible to our current approach
• Extremely memory hungry - MUST have PSRAM for useful panel sizes
• Requires at least esp-idf 4.4.8 (=arduino-esp32 v2.0.17) => possible bad side-effects because Espressif always hides new bugs in their "minor updates"

[stuartparmenter]

Thanks for taking a look.

A few notes:

• Memory usage should be roughly the same (or slightly better, but negligible) on esp32,s2,s3. Currently no PSRAM support on these platforms but I noticed someone working on it in a fork so probably will support soon.
• The parlio (C6&P4) implementation is a bit more memory hungry, but C6 isn't super practical given no PSRAM and limited GPIO. P4 has very fast PSRAM so less of a problem.
• It probably works fine on slightly earlier esp-idf 4.x -- I only really added backwards support since WLED is still on 4.x (but C6 and P4 need 5.x)
• Double buffering is supported, but the size of the extra display DMA buffer is probably bigger than your LED one so I would experiment w/o it.
• It is slightly faster in terms of CPU cycles/pixel, especially with bulk render api, but it works in similar way where you're ultimately limited by panel clock speed & bit depth setting (and number of panels)

tldr: probably some wins, behaves fairly similarly overall