ESP32 hard crash on i2c display

[jfurcean]

CircuitPython version

Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-02; FeatherS2 with ESP32S2

Code/REPL

import busio
import board
import displayio
import adafruit_displayio_ssd1306

displayio.release_displays()

i2c = busio.I2C(board.SCL, board.SDA)

display_bus = displayio.I2CDisplay(i2c, device_address=0x3C)
display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)

Behavior

This code crashes on the final line using a Feather S2 and the STEMMA QT 0.91" OLED Display 128x32.

Description

• might be related to Kaluga not connecting via USB (since esp-idf update?) #4951
• might have started with the Update esp-idf to v4.3 #4195
• other i2c devices worked like the i2c Stemma QT Rotary Encoder

Additional information

No response

[meltdown03]

I get also a hard crash when using the the SPI display on the Kaluga V1.2 . It worked a month ago. Happens at the same line of code (except SPI bus)

[meltdown03]

SPI seems to work now, as of build today (5756ddd). I see some SPI fixes were commited

[jerryneedell]

I2C works OK on an ESP32s2 SAOLA-WROVER with the current tip of main.

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Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-03; Saola 1 w/Wrover with ESP32S2
>>> import busio
>>> import board
>>> import displayio
>>> import adafruit_displayio_ssd1306
>>> 
>>> displayio.release_displays()
>>> i2c = busio.I2C(board.IO2, board.IO1)
>>> display_bus = displayio.I2CDisplay(i2c, device_address=0x3C)
>>> display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)
>>> 
>>> 
>>> 

[jerryneedell]

And it also works now , for me, on a FeatherS2 (using an OLED SSD1306 featherwing)
This appears to be the same commit that failed above...

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Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-03; FeatherS2 with ESP32S2
>>> import busio
>>> import board
>>> import displayio
>>> import adafruit_displayio_ssd1306
>>> 
>>> displayio.release_displays()
>>> 
>>> i2c = busio.I2C(board.SCL, board.SDA)
>>> 
>>> display_bus = displayio.I2CDisplay(i2c, device_address=0x3C)
>>> display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)
>>> 
>>> 

[jerryneedell]

Trying to reproduce the failing test setup - I have a STEMMA OLED SSD1306 132x64.
It also works for me on the FeatherS2

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.

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Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-03; FeatherS2 with ESP32S2
>>> import busio
>>> import board
>>> import displayio
>>> import adafruit_displayio_ssd1306
>>> 
>>> displayio.release_displays()
>>> 
>>> i2c = busio.I2C(board.SCL, board.SDA)
>>> display_bus = displayio.I2CDisplay(i2c, device_address=0x3D)
>>> display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=64)
>>> 
>>> 
>>> 

[jfurcean]

It works fine when running in REPL the first time, but crashes on import adafruit_displayio_ssd1306 after a soft reboot.

Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-02; FeatherS2 with ESP32S2
>>> import busio
>>> import board
>>> import displayio
>>> import adafruit_displayio_ssd1306
>>> displayio.release_displays()
>>> i2c = busio.I2C(board.SCL, board.SDA)
>>> display_bus = displayio.I2CDisplay(i2c, device_address=0x3C)
>>> display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)
>>> 
soft reboot

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:

Code done running.

Press any key to enter the REPL. Use CTRL-D to reload.

Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-02; FeatherS2 with ESP32S2
>>> import busio
>>> import board
>>> import displayio
>>> import adafruit_displayio_ssd1306

[jerryneedell]

Ah -- that reminds me of a very old issue I ran across on the feathers2 -- I had that problem if I used the .uf2 bootloader, but not if I flash with the .bin file ....
adafruit/tinyuf2#74

I have not been using the UF2 bootloader on the featherS2 or the Saola

[jerryneedell]

Ah -- never mind -- I just crashed mine trying to run the code after a soft reboot....

[jerryneedell]

but it crashes before the last line -- mine crashes on the import adafruit_displayio_ssd1306 line
ah -- I missed that this is exactly what you see... bug confirmed

[jerryneedell]

@jfurcean if found that it works if I do a

import displayio
displayio.release_displays()

after the soft reboot

then I can run the code repeatedly after soft reboot if I release the display each time.

[jerryneedell]

I wonder if this is a displayio issue -- or even an expected behavior if the display is not released.

[jerryneedell]

Well -- that does not make senses since the code does the release, but for some reason, it has to be done before importing the ssd1306 library...

Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-03; FeatherS2 with ESP32S2
>>> import displayio
>>> displayio.release_displays()
>>> import busio
>>> import board
>>> import displayio
>>> import adafruit_displayio_ssd1306
>>>
>>> displayio.release_displays()
>>>
>>> i2c = busio.I2C(board.SCL, board.SDA)
>>>
>>> display_bus = displayio.I2CDisplay(i2c, device_address=0x3C)
>>> display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)
>>>
soft reboot

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.

Code done running.

Press any key to enter the REPL. Use CTRL-D to reload.

Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-03; FeatherS2 with ESP32S2
>>> import displayio
>>> displayio.release_displays()
>>> import busio
>>> import board
>>> import displayio
>>> import adafruit_displayio_ssd1306
>>>
>>> displayio.release_displays()
>>>
>>> i2c = busio.I2C(board.SCL, board.SDA)
>>>
>>> display_bus = displayio.I2CDisplay(i2c, device_address=0x3C)
>>> display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)
>>>
>>>
>>> 

[jfurcean]

It also works fine with QT PY Haxpress and the QT PY RP2040 without changing the order.

Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-02; Adafruit QT Py RP2040 with rp2040
>>> import busio
>>> import board
>>> import displayio
>>> import adafruit_displayio_ssd1306
>>> displayio.release_displays()
>>> i2c = busio.I2C(board.SCL1, board.SDA1)
>>> display_bus = displayio.I2CDisplay(i2c, device_address=0x3C)
>>> display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)
>>> 
soft reboot

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:

Code done running.

Press any key to enter the REPL. Use CTRL-D to reload.

Adafruit CircuitPython 7.0.0-alpha.3-493-gc37f354d2 on 2021-07-02; Adafruit QT Py RP2040 with rp2040
>>> import busio
>>> import board
>>> import displayio
>>> import adafruit_displayio_ssd1306
>>> displayio.release_displays()
>>> i2c = busio.I2C(board.SCL1, board.SDA1)
>>> display_bus = displayio.I2CDisplay(i2c, device_address=0x3C)
>>> display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)
>>> 
>>> 
>>> 

[jerryneedell]

it does seem like an issue with the esp32s2 ...
FWIW -- this works repeatedly with soft reboot

import busio
import board
import displayio
displayio.release_displays()
import adafruit_displayio_ssd1306

i2c = busio.I2C(board.SCL, board.SDA)

display_bus = displayio.I2CDisplay(i2c, device_address=0x3D)
display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=64)

[jerryneedell]

oops -- accidental close

[deshipu]

Well -- that does not make senses since the code does the release, but for some reason, it has to be done before importing the ssd1306 library...

The adafruit_displayio_ssd1306 library doesn't do anything on import, other than setting a few constants: https://github.com/adafruit/Adafruit_CircuitPython_DisplayIO_SSD1306/blob/main/adafruit_displayio_ssd1306.py

This sounds like some kind of a race condition — maybe there is a delay required between releasing the displays and creating a new displayio display. Maybe because it's still updating one frame in the background?

[dhalbert]

A garbage collection is done after each import, so I wonder if it's a storage management problem.