board.SCK in use error on second run

[grgrant]

CircuitPython version and board name

Adafruit CircuitPython 10.0.3 on 2025-10-17; Adafruit Feather ESP32S3 4MB Flash 2MB PSRAM with ESP32S3

Code/REPL

import board
import busio
import displayio
import fourwire
import time
import alarm


SLEEP=20

time.sleep(10) # Allow me time connect after reset via USB Serial
print("Initing SPI")
spi = busio.SPI(board.SCK, board.MOSI)  # Uses SCK and MOSI
print("Done initing SPI")

epd_cs = board.D9
epd_dc = board.D10
epd_reset = board.D12
epd_busy = board.D11

display_bus = fourwire.FourWire(spi, command=epd_dc, chip_select=epd_cs, reset=epd_reset, baudrate=1000000)

time.sleep(1) # In case things need to settle before deep sleep
displayio.release_displays()  # Without this line the issue doesn't happen
time_alarm = alarm.time.TimeAlarm(monotonic_time=time.monotonic() + SLEEP)
alarm.exit_and_deep_sleep_until_alarms(time_alarm)

Behavior

Output after a microcontroller reset and the second error is after waking up from simulated deep sleep:

Initing SPI
Done initing SPI

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

Press any key to enter the REPL. Use CTRL-D to reload.
Pretending to deep sleep until alarm, CTRL-C or file write.
Woken up by alarm.

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
Initing SPI
Traceback (most recent call last):
  File "code.py", line 13, in <module>
ValueError: SCK in use

Code done running.

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

Adafruit CircuitPython 10.0.3 on 2025-10-17; Adafruit Feather ESP32S3 4MB Flash 2MB PSRAM with ESP32S3

Same output when typing control D rather than waiting for a deep sleep timeout

Initing SPI
Done initing SPI

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

Press any key to enter the REPL. Use CTRL-D to reload.
Pretending to deep sleep until alarm, CTRL-C or file write.
[^D pressed here]
Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
Initing SPI
Traceback (most recent call last):
  File "code.py", line 13, in <module>
ValueError: SCK in use

Code done running.

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

Description

• First noticed in REPL connected via USB to ESP32-S2/Eink Feather Friend./3rd party BWR display.
• Now replicated by above code on brand new Feather ESP32-S3 with nothing but USB REPL attached and fresh Circuit Python 10.0.3.
• Traced to the displayio.release_displays() done in the previous iteration. When commented out this problem does not happen
• I'm releasing displays so the previously painted info stays on the screen rather than showing the console when I'm in REPL
• At the end of deep sleep when the code starts over the SCK in use error happens
• The error also happens if I do a control-c control-d to execute before deep sleep is done
• This is simulated deep sleep because of connected USB but I have reason to believe from some unexpected resetting that it may be happening after a real deep sleep.

Additional information

No response

[grgrant]

Not sure if this helps but I tried the same code on Adafruit CircuitPython 10.1.0-rc.1 and it doesn't exhibit the same behavior -- at least I've not been able to cause the error.

[grgrant]

Disregard this for now. Possibly #10822 inadvertently masked. Will recheck with 10.1.1.

Retested with CP 10.1.0 released version and it no longer shows board.SCK in use even with multiple repetitions of simulated deep sleep in a loop. I believe this is fixed in 10.1.0.

Exact hardware and code still exhibits error in 10.0.3 so I verified that I'm using HW/code.py that causes error in 10.0.3.

[dhalbert]

Try artfiacts from https://github.com/adafruit/circuitpython/actions/runs/22075913223/attempts/1

[grgrant]

This appears to be solved in 10.1.1 so I think this can be closed.

Initing SPI
Done initing SPI

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

Press any key to enter the REPL. Use CTRL-D to reload.
Pretending to deep sleep until alarm, CTRL-C or file write.
Woken up by alarm.

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

Code done running.

Press any key to enter the REPL. Use CTRL-D to reload.
Pretending to deep sleep until alarm, CTRL-C or file write.

Adafruit CircuitPython 10.1.1 on 2026-02-17; Adafruit Feather ESP32S3 4MB Flash 2MB PSRAM with ESP32S3
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