zephyr-cp: raise the rpi_pico UDC thread stack in debug builds by tyeth · Pull Request #5 · tyeth/circuitpython

tyeth · 2026-09-08T16:48:47Z

Independent of the Bluetooth work — affects any RP2040/RP2350 board built with DEBUG=1.

debug.conf raises the DWC2 and nRF UDC thread stacks (verbose logging with LOG_MODE_IMMEDIATE formats in-thread and needs the headroom) but the rpi_pico one was missed. It defaults to 512 bytes and overflows during USB enumeration on a Pico 2 W:

***** USAGE FAULT *****
  Stack overflow (context area not valid)
>>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
Current thread: 0x200034b0 (usbd@50110000)

The board dies partway through configuration, so it presents as a bad USB come-up rather than a stack problem — it cost a while to spot, hence splitting it out on its own.

Caught with HW_STACK_PROTECTION enabled; without the MPU guard this is silent stack corruption instead of a clean fault.

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tyeth · 2026-09-08T18:44:10Z

Part of the CYW43439 shared-bus Bluetooth work tracked in #15, which links every PR and open issue across the four forks.

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tyeth · 2026-09-08T21:43:18Z

Rebased onto main 121489fe70 (force-pushed with --force-with-lease). New head 5f0ea1254a, previously 3955657be8.

Clean rebase, no conflicts: debug.conf has not changed upstream. Nothing on this branch touched the board files that main moved to boards/<vendor>/<board>/, so the only effect here is a fresh base for #4 and #14, which are re-stacked on this commit.

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tyeth · 2026-09-09T11:30:24Z

This fix is incomplete: it only covers debug builds, and release builds lose USB because of it. See #18.

CONFIG_UDC_RPI_PICO_STACK_SIZE=2048 here lives in debug.conf, so release images keep Zephyr's 512-byte default. On hardware (Pico 2 W, 10.3.0-51-g8031983fc9) a release build drops off USB entirely partway through a _bleio scan — CDC port and CIRCUITPY volume both gone, USB device/stack error on reset, recovered by an SWD reset run.

The original usbd@50110000 stack overflow this PR was written for therefore still affects the images we actually flash, which also explains the "USB came up badly" resets seen during the initial Pico 2 W bring-up.

Suggested change: move the line to prj.conf. Verified on hardware — with it, a 12 s active scan yielding 925 reports from 20 distinct devices completes with USB intact; without it the same workload kills the bus.

🤖 Generated with Claude Code

…ing-uartlogger2 Enable turbo loader on HalloWing M4 and UART Logger II

…eenable Turn the native .mpy loader back on for all nRF52 boards

Make `MICROPY_PY_DOUBLE_TYPECODE` cover every `'d'` typecode path

Store ROM qstr strings in a blob with 16-bit offsets

- board_init() no longer deletes code.py or creates main.py: the Elioblocs editor now writes code.py. - The default boot.py explains why the drive is read-only and how to change it. - GPIO15-16 are free pins (no 32 kHz crystal), and the NeoPixel count anticipates the next board revision.

The artifact API token `ACTIONS_RUNTIME_TOKEN` is only given to action steps, not `run:` steps, so calling the script with `node` found no records at all. `ci_download_sizes.mjs` is now a module that an `actions/github-script` step imports and calls; the install of `@actions/artifact` stays a shell step. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

…main Translations update from Hosted Weblate

The free-flash filter defaulted to "under 1 KiB", which shows an empty table when no board is that tight, as on main today. Default to "all"; the colour bands still mark the tight boards. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

…path bitmaptools.blit() fast path

Add ELIO Eliobot S3 board

Report firmware sizes from CI

Port-level never_reset tracking and bulk reset helpers are removed. Objects own their hardware and free it via GC finalizers (__del__ -> deinit).

Pin the dependency's one-shot GPTimer correction and version-gated GDMA setup. MatrixPortal S3 hardware now displays correct one- through four-bit patterns, including RGB ramps and pause/resume at three and four bits. Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Keep the ABC and ESP32 refresh implementation while using the dependency's minimal diff against its IDF6 base. Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Update the Protomatter dependency for PR adafruit#92 targeting master with IDF6 support and reliable ESP32 timer scheduling. The dependency source tree matches the previously validated d51abd7 tree exactly. Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Help define board.DISPLAY

Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

stm: switch to finalizer cleanup (CIRCUITPY_BULK_RESET = 0)

Add analogio support to Zephyr

Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Reject invalid height, width, bit depth, tile count, and pin arguments before registering an RGBMatrix object in the static display-bus array. This avoids leaking a slot and leaving an incomplete object for reset handling when those checks raise an exception. Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Expose RowAddressMode.BINARY and RowAddressMode.ABC and validate the constructor argument with the standard CircuitPython enum helpers. Keep binary addressing as the default and update the API documentation. Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Addresses review feedback: don't reference the old never-reset implementation in comments, just explain how it works now.

nordic: switch to finalizer cleanup (CIRCUITPY_BULK_RESET = 0)

…xrt10xx mimxrt10xx: switch to finalizer cleanup (CIRCUITPY_BULK_RESET = 0)

Updated the boot button definition for safe mode.

Boot button seems to be 28 (tested with a GPIO monitor script)

…_1_47 Waveshare esp32 c5 lcd 1 47

rgbmatrix: add serial ABC row-addressing mode

…x-argument-validation Validate RGBMatrix arguments before reserving a display bus

Implement RTC on Zephyr

debug.conf bumps the DWC2 and nRF UDC thread stacks because verbose logging with LOG_MODE_IMMEDIATE formats in-thread and needs more stack, but the rpi_pico one was missed. It defaults to 512 bytes, which overflows during USB enumeration on a Pico 2 W: ***** USAGE FAULT ***** Stack overflow (context area not valid) >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0 Current thread: 0x200034b0 (usbd@50110000) The board dies partway through configuration, which looks like a bad USB come-up rather than a stack problem. Independent of any Bluetooth work — it affects any RP2040/RP2350 board built with DEBUG=1. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

This was referenced Sep 8, 2026

Build node/ and collector/ with mpy-cross + circup; record results tyeth/deepsleep_espnow_wifi_and_ble_env_collector#10

Merged

Tracking: Pico W / Pico 2 W Bluetooth + Soft_AP DHCP + SSL/TLS HTTP Server via the CYW43439 shared gSPI bus #15

Open

tyeth mentioned this pull request Sep 8, 2026

BLE branches cannot build in CI: HCI driver is absent from the pinned zephyr revision #16

Open

tyeth force-pushed the zephyr-cp-debug-udc-stack branch from 3955657 to 5f0ea12 Compare September 8, 2026 21:43

This was referenced Sep 8, 2026

zephyr-cp: enable BLE on the Raspberry Pi Pico 2 W #4

Open

zephyr-cp: release builds lose USB during BLE activity — the UDC thread stack fix in #5 is debug-only #18

Closed

tannewt and others added 17 commits September 17, 2026 09:28

Merge pull request adafruit#11405 from mikeysklar/samx5x-turbo-hallow…

e6a6916

…ing-uartlogger2 Enable turbo loader on HalloWing M4 and UART Logger II

Merge remote-tracking branch 'origin/main'

6b36fac

Merge pull request adafruit#11406 from mikeysklar/load-native-nrf52-r…

e543fcd

…eenable Turn the native .mpy loader back on for all nRF52 boards

Merge remote-tracking branch 'origin/main'

f11f0fc

Merge pull request adafruit#11410 from dhalbert/double-typecode-guard

6e982d2

Make `MICROPY_PY_DOUBLE_TYPECODE` cover every `'d'` typecode path

Merge remote-tracking branch 'origin/main'

139246e

Merge pull request adafruit#11407 from dhalbert/qstr-blob

9ad9876

Store ROM qstr strings in a blob with 16-bit offsets

Merge remote-tracking branch 'adafruit/main' into littlefs

fe8f49b

Merge pull request adafruit#11412 from weblate/weblate-circuitpython-…

268a168

…main Translations update from Hosted Weblate

bitmaptools.blit fast path

29db520

Auto-update the Zephyr autogen files

04001aa

Merge pull request adafruit#11413 from FoamyGuy/bitmaptools_blit_fast…

dd72cb9

…path bitmaptools.blit() fast path

Merge pull request adafruit#11411 from Eliobot/eliobot-s3-board

2b386e2

Add ELIO Eliobot S3 board

Merge pull request adafruit#11408 from dhalbert/ci-firmware-sizes

50f1ff0

Report firmware sizes from CI

tannewt and others added 29 commits October 1, 2026 15:04

stm: switch to finalizer cleanup (CIRCUITPY_BULK_RESET = 0)

9d17935

Port-level never_reset tracking and bulk reset helpers are removed. Objects own their hardware and free it via GC finalizers (__del__ -> deinit).

nordic: switch to finalizer cleanup (CIRCUITPY_BULK_RESET = 0)

ed557c7

Port-level never_reset tracking and bulk reset helpers are removed. Objects own their hardware and free it via GC finalizers (__del__ -> deinit).

Update Protomatter pin after formatting cleanup

37e8da8

Keep the ABC and ESP32 refresh implementation while using the dependency's minimal diff against its IDF6 base. Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Add displayio module inclusion in pins.c

a052d1b

Help define board.DISPLAY

Update Protomatter with Arduino stop and resume fixes

08cdf24

Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Merge pull request adafruit#11487 from tannewt/remove_never_reset-stm

aabd9a3

stm: switch to finalizer cleanup (CIRCUITPY_BULK_RESET = 0)

Merge pull request adafruit#11481 from tannewt/zephyr_analogio

6fefe63

Add analogio support to Zephyr

Merge main into rgbmatrix-abc

b98fc50

Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Merge latest main updates into rgbmatrix-abc

a4a36eb

Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

Rewrite board.c comments to only describe current behavior

2aa1b0d

Addresses review feedback: don't reference the old never-reset implementation in comments, just explain how it works now.

Remove extra braces

b6bb7ba

Merge pull request adafruit#11488 from tannewt/remove_never_reset-nordic

16ad502

nordic: switch to finalizer cleanup (CIRCUITPY_BULK_RESET = 0)

Merge branch 'main' into waveshare_esp32_c5_lcd_1_47

0c02114

Merge pull request adafruit#11485 from tannewt/remove_never_reset-mim…

7438139

…xrt10xx mimxrt10xx: switch to finalizer cleanup (CIRCUITPY_BULK_RESET = 0)

Change boot button to GPIO28 for safe mode

90e2194

Updated the boot button definition for safe mode.

Update GPIO pin assignments for buttons

e34619f

Boot button seems to be 28 (tested with a GPIO monitor script)

Merge branch 'main' into waveshare_esp32_c5_lcd_1_47

0f54a6a

Implement RTC on Zephyr

3156883

Merge branch 'main' into rgbmatrix-abc

8e3c267

Merge branch 'main' into fix/rgbmatrix-argument-validation

fed158d

Merge pull request adafruit#11480 from dglaude/waveshare_esp32_c5_lcd…

5d73e28

…_1_47 Waveshare esp32 c5 lcd 1 47

Merge pull request adafruit#11486 from ladyada-eagleclaw/rgbmatrix-abc

aabd3bc

rgbmatrix: add serial ABC row-addressing mode

Merge pull request adafruit#11490 from ladyada-eagleclaw/fix/rgbmatri…

eec31fe

…x-argument-validation Validate RGBMatrix arguments before reserving a display bus

Merge pull request adafruit#11491 from tannewt/zephyr_rtc

35210c2

Implement RTC on Zephyr

tyeth force-pushed the zephyr-cp-debug-udc-stack branch from 5f0ea12 to cfbb1c9 Compare October 3, 2026 13:39

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zephyr-cp: raise the rpi_pico UDC thread stack in debug builds - #5

zephyr-cp: raise the rpi_pico UDC thread stack in debug builds#5
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