Introduce RGB LED effects

[kopecdav]

This PR introduces LED effects into the rgb_led driver.

LED effects

The rgb_led driver effects are driven by an internal systimer which interrupts every 20ms (50Hz) when an effect is started. The interrupt then calls an effect callback from the lookup table which returns the actual RGB LED color based on the elapsed time.

API

The rgb_led API introduces two functions:

• rgb_led_effect_start - starts the selected effect for the requested number of cycles (or indefinitely)
• rgb_led_effect_stop - stops the ongoing effect

The already available rgb_led_set_color function will stop any ongoing effect and override the LED color.

API was exposed to FW via stubs.

Color palette and effect LUT

The driver was updated with a color palette defined by designers, and introduces two effects (BOOTLOADER BREATE, CHARGING) according to FW and bootloader flow. Both the palette and effects will probably be subject to fine-tuning to meet design expectations.

Prodtest

In order to allow testing, prodtest was extended with rgbled-effect-start and rgbled-effect-stop commands.

[Copilot]

Pull Request Overview

This PR introduces RGB LED effects functionality to the Trezor T3W1 device, enabling dynamic LED animations driven by system timers. The implementation adds support for predefined effects like bootloader breathing and charging animations.

• Adds RGB LED effects infrastructure with systimer-based callbacks for 50Hz effect updates
• Introduces two predefined effects: bootloader breathe (blue) and charging (yellow) with configurable cycle counts
• Extends prodtest commands and API exposure to support effect control and testing

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
core/site_scons/models/T3W1/*.py	Adds rgb_led_effects.c source file to build configuration
core/embed/sys/syscall/stm32/syscall_*.c	Implements syscall stubs and dispatch for new effect start/stop functions
core/embed/sys/syscall/inc/sys/syscall_numbers.h	Adds syscall numbers for RGB LED effect operations
core/embed/rust/build.rs	Exposes new RGB LED effect types and functions to Rust bindings
core/embed/projects/prodtest/cmd/prodtest_rgbled.c	Adds prodtest commands for starting and stopping RGB LED effects
core/embed/projects/prodtest/README.md	Documents new prodtest commands for RGB LED effects
core/embed/io/rgb_led/unix/rgb_led.c	Provides stub implementations for Unix platform
core/embed/io/rgb_led/stm32u5/rgb_led_lp.c	Core RGB LED driver with effect management and systimer integration
core/embed/io/rgb_led/stm32u5/rgb_led_internal.h	Internal driver structures and effect callback definitions
core/embed/io/rgb_led/stm32u5/rgb_led_effects.c	Effect implementations with linear interpolation and timing logic
core/embed/io/rgb_led/inc/io/rgb_led.h	Public API definitions, color palette, and effect types

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[github-actions]

en main(all)

model	device_test	click_test	persistence_test
T2T1	test(all) main(all)	test(all) main(all)	test(all) main(all)
T3B1	test(all) main(all)	test(all) main(all)	test(all) main(all)
T3T1	test(all) main(all)	test(all) main(all)	test(all) main(all)
T3W1	test(all) main(all)	test(all) main(all)	test(all) main(all)

Latest CI run: 17124684426