`RGBMatrix` display showing white vertical lines when re-initialized on ESP32-S2

[arduino12]

CircuitPython version

Adafruit CircuitPython 8.2.9 on 2023-12-06; S2Mini with ESP32S2-S2FN4R2
Also on:
Adafruit CircuitPython 9.0.0-alpha.6 on 2023-12-12; S2Mini with ESP32S2-S2FN4R2

Code/REPL

import board
import displayio
from framebufferio import FramebufferDisplay
from rgbmatrix import RGBMatrix


def get_display():
    matrix = RGBMatrix(
        width=128,
        bit_depth=1,
        rgb_pins=[board.IO1, board.IO40, board.IO2, board.IO4, board.IO38, board.IO6],
        addr_pins=[board.IO8, board.IO34, board.IO10, board.IO21, board.IO36],
        clock_pin=board.IO13,
        latch_pin=board.IO17,
        output_enable_pin=board.IO14)
    return FramebufferDisplay(matrix)


# deinit previous displays
displayio.release_displays()

# first instance works
display = get_display() 

# draw a white 4x4 square
g = displayio.Group()
p = displayio.Palette(1)
p[0] = 0xffffff
b = displayio.Bitmap(4, 4, 1)
tg = displayio.TileGrid(b, pixel_shader=p, x=10, y=10)
g.append(tg)
display.root_group = g

# I use Thonny, so pressing F5 will run the code again (after a soft-restart)
# and the bug will occur..

# I can also cause the bug by repeating the above lines like this:
input('Press ENTER to re-initialized the display to cause the BUG!')

# deinit first instance - display turns off,
# `matrix` and `display` become `None`
displayio.release_displays()

# BUG: the display shows white vertical lines!
display = get_display()

Behavior

Display works on the first time,
But after pressing ENTER - it is re-initialized and the bug occurs.

Running the code again won't work either- the only way to fix it is with a hardware-reset to the board.

Description

Bug occurs only on ESP32-S2 (it seems to draw the REPL text for a split second before the white vertical lines),
on my ESP32-S3 it works as expected.

I tried using DigitalInOut on GPIOs, gc.collect(), supervisor.reload(),
I tried adding to code.py: status_bar.console = False, status_bar.display = False..
Nothing seems to fix it - only a hardware-reset (or a __import__('microcontroller').reset()).

Same thing here:
#8303 (comment)

It makes it hard to develop the code since a hardware-reset is needed before every re-run.

Additional information

No response

[dhalbert]

Do you see this same behavior on 8.2.9?

[arduino12]

Yes on both 8.2.9 and 9.0.0,
Made a video of running the code above:
(first time I run it- it work and draw a small rect, after I press ENTER and on every next run - showing white vertical lines):

WhatsApp.Video.2023-12-23.at.22.20.22.mp4

[tannewt]

Please post a picture. The video file is corrupt.

[arduino12]

Here is a screenshot from the video on this page:

Let me know if I can provide more help :)

[mfinkle]

I ran into the same problem on the two Feather ESP32-S2 boards I have. I narrowed down the regression to something that happened between these two UF2 files:

• adafruit-circuitpython-adafruit_feather_esp32s2-en_US-8.2.0-beta.1.uf2 [WORKS]
• adafruit-circuitpython-adafruit_feather_esp32s2-en_US-8.2.0-rc.0.uf2 [FAILS]

I tested by installing the UF2, running the code, saving the same code back to the device (forcing a soft-reboot). As mentioned above, the initial load works, but forcing the soft-reboot causes the vertical lines to display.