feat(flex-stacker): Bring up the internal/external status led bars and add gcode to control them.

[vegano1]

Overview

The Flex stacker has 2 status-led strips of 4 LEDs each for 8, a is31FL3209 drives each strip-led driver. Each LED status bar can be addressed via I2C on addresses 0x6C for the internal strip and 0x6F for the external strip. This pull request brings up the i2c communication and uses the is31FL3209_driver.hpp and adds a ui_task.hpp that drives the heartbeat status led as well as the status bar state and controls.

Closes: EXEC-956

gcode SetStatusBarColor (M200) format

M200 P1 C0 K0
P = Power, float with values of 0 through 1.
0 Turns OFF the LEDs
0.1 - 1 Turns ON the LEDs to the given intensity.

C = Color, int with values 0 - 3
0: White
1: Red
2: Green
3: Blue.
NOTE: Sets the last color if omitted.

K = kind, int with values 0 or 1
0 = internal status bar
1 = external status bar.
NOTE: Sets both if omitted

Examples:

M200 P1 C1 K0 \r\n
Turns ON (P1) the Internal (K0) status bar to the color red (C1)

M200 P0
Turns OFF (P0) both status bars (K omitted) to the last color (C omitted)

Change log

• Sets up i2c communication setup and usage via the i2c::hardware::I2C class
• Adds a UIPolicy class to provide i2c comms and heartbeat LED toggles to the UITask
• Adds a UITask class which is responsible for managing and controlling the heartbeat led on the board and the status bars.
• Adds a SetStatusBarColor (M200) gcode that can set one or all status bar leds and power

Testing

• Test on the flex and make sure we can address both the internal / external led strips using the SetStatusBarColor (M200) gcode.

Reviewer Request

Anything I'm missing?

[sfoster1]

lgtm, though you might want something where you can set channels numerically for testing

[ahiuchingau]

Implementation looks good to me.

Can we disable setting the color to red when there's an error/a stall for now (so it doesn't do that for slas)?

[vegano1]

lgtm, though you might want something where you can set channels numerically for testing

Sounds good, will add in a follow-up pr.