Simplify the status LED to save power

[tannewt]

This also removes the need to pin share because we don't use the
status LED while user code is running.

The status flashes fallback to the HW_STATUS LED if no RGB LED is
present. Each status has a unique blink pattern as well.

One caveat is the REPL state. In order to not pin share, we set the
RGB color once. PWM and single color will be shutoff immediately but
DotStars and NeoPixels will hold the color until the user overrides
it.

Fixes #4133

[Neradoc]

I tested: the green blink after the code ends, red on exception and yellow when reset to safe mode.

• works as expected on a QT PY 2040
• works on the Feather NRF52840 Express after uncommenting MICROPY_HW_NEOPIXEL

On a Feather M4 and Feather M0 Express, the LED stays either black or lit. It comes back to life when doing things like opening the drive in the Finder or activating and sending data to CDC2.

[tannewt]

On a Feather M4 and Feather M0 Express, the LED stays either black or lit. It comes back to life when doing things like opening the drive in the Finder or activating and sending data to CDC2.

Thanks for finding this! I'm able to reproduce it but can't find the issue. Will have to get the debugger out tomorrow.

[jposada202020]

Led does not turn on
was tested on

Adafruit CircuitPython 7.0.0-alpha.2-573-g49bad0797 on 2021-05-14; Adafruit Feather M4 CAN with same51j19a

Neopixel only turns green on bootoader mode.

[tannewt]

Led does not turn on
was tested on

Adafruit CircuitPython 7.0.0-alpha.2-573-g49bad0797 on 2021-05-14; Adafruit Feather M4 CAN with same51j19a

Neopixel only turns green on bootoader mode.

I think this was broken before this change. The M4 CAN has a neopixel power pin that the core doesn't know how to turn on. On some boards with turn it off and on with board_init and board_deinit but I don't see that code for the M4 CAN.

[tannewt]

@jposada202020 Please test the latest artifacts. The M4 CAN has a power enable pin for the neopixel that should now be handled.

@hierophect I've fixed the STM safe mode blinks too. It didn't have the reset reason implemented which caused CP to wait for safe mode reset after each deep sleep.

[jposada202020]

Tested on

Adafruit CircuitPython 7.0.0-alpha.2-608-gd134e2af8 on 2021-05-19; Adafruit Feather M4 CAN with same51j19a

Results

REPL : NO light

Init : 3 Yellow - 1 Green

Code Running: 1 Green every 5-6 sec

Code Error: 2 Reds

Bootloader: Green all the time

[kattni]

Tested final change on MagTag. LEDs are acting as expected - purple, three yellow blinks on startup, and blinking three yellows when in safe mode.

[Neradoc]

We can PR them after this one is merged, but there are 2 more boards that need their MICROPY_HW_LED_[RGB] changed to CIRCUITPY_RGB_STATUS_[RGB]:

• pimoroni_tiny2040 (also CIRCUITPY_RGB_STATUS_INVERTED_PWM)
• pimoroni_picosystem (probably inverted too ?)

[kattni]

Tested safe mode on ItsyBitsy, it now works properly. LEDs are intermittently flashing yellow as expected. Flashing on startup was also as expected.