7
31
Fork
You've already forked blackmagic
23

Fix: BMDU UART auto TX/RX swapping #2233

Merged
esden merged 11 commits from fix/bmdu-uart-auto-txrx-swapping into main 2026年04月21日 02:31:04 +02:00

Detailed description

In this PR we address a bug found by Esden when trying to use BMPv3's UARTs for some debugging. The nature of the issue means that the TX/RX auto-swapping logic was interfering with the active UART tracking, thus we transform that auto-swapping logic into a monitor command for a little less automation, but this then allows BMPv3 to correctly pick up that the BMDU UART is active and route traffic through to the target serial interface.

Tested with a STM32F410 Nucleo. Need to do further testing for the active UART tracking and swapping, but in principal it's working correctly now.

Your checklist for this pull request

Closing issues

<!-- Filling this template is mandatory --> ## Detailed description In this PR we address a bug found by Esden when trying to use BMPv3's UARTs for some debugging. The nature of the issue means that the TX/RX auto-swapping logic was interfering with the active UART tracking, thus we transform that auto-swapping logic into a monitor command for a little less automation, but this then allows BMPv3 to correctly pick up that the BMDU UART is active and route traffic through to the target serial interface. Tested with a STM32F410 Nucleo. Need to do further testing for the active UART tracking and swapping, but in principal it's working correctly now. ## Your checklist for this pull request * [x] I've read the [Code of Conduct](https://codeberg.org/blackmagic-debug/blackmagic/src/CODE_OF_CONDUCT.md) * [x] I've read the [guidelines for contributing](https://codeberg.org/blackmagic-debug/blackmagic/src/CONTRIBUTING.md) to this repository * [x] It builds for hardware native (see [Building the firmware](https://codeberg.org/blackmagic-debug/blackmagic?tab=readme-ov-file#building-the-firmware)) * [x] It builds as BMDA (see [Building the BMDA](https://codeberg.org/blackmagic-debug/blackmagic?tab=readme-ov-file#building-black-magic-debug-app)) * [x] I've tested it to the best of my ability * [x] My commit messages provide a useful short description of what the commits do ## Closing issues <!-- put "fixes #XXXX" here to auto-close the issue(s) that your PR fixes (if any). -->
dragonmux force-pushed fix/bmdu-uart-auto-txrx-swapping from 9cd0da84b9 to 1cc9ba8cd8
Some checks failed
ci/woodpecker/pr/build-firmware/4 Pipeline was successful
ci/woodpecker/pr/build-firmware/6 Pipeline was successful
ci/woodpecker/pr/build-firmware/3 Pipeline was successful
ci/woodpecker/pr/build-firmware/2 Pipeline was successful
ci/woodpecker/pr/build-firmware/5 Pipeline was successful
ci/woodpecker/pr/build-firmware/1 Pipeline was successful
ci/woodpecker/pr/build-firmware/11 Pipeline was successful
ci/woodpecker/pr/build-firmware/10 Pipeline was successful
ci/woodpecker/pr/build-firmware/8 Pipeline was successful
ci/woodpecker/pr/build-firmware/9 Pipeline was successful
ci/woodpecker/pr/build-firmware/7 Pipeline was successful
ci/woodpecker/pr/build-firmware/12 Pipeline was successful
ci/woodpecker/pr/build-firmware/13 Pipeline was successful
ci/woodpecker/pr/build-firmware/18 Pipeline failed
ci/woodpecker/pr/build-firmware/16 Pipeline was successful
ci/woodpecker/pr/build-firmware/19 Pipeline was successful
ci/woodpecker/pr/build-firmware/14 Pipeline was successful
ci/woodpecker/pr/build-firmware/17 Pipeline was successful
ci/woodpecker/pr/build-firmware/15 Pipeline was successful
ci/woodpecker/pr/build-firmware/20 Pipeline was successful
ci/woodpecker/pr/build-linux/1 Pipeline was successful
ci/woodpecker/pr/build-linux/2 Pipeline was successful
ci/woodpecker/pr/build-windows Pipeline was successful
2026年04月19日 18:13:59 +02:00
Compare
dragonmux force-pushed fix/bmdu-uart-auto-txrx-swapping from 1cc9ba8cd8
Some checks failed
ci/woodpecker/pr/build-firmware/4 Pipeline was successful
ci/woodpecker/pr/build-firmware/6 Pipeline was successful
ci/woodpecker/pr/build-firmware/3 Pipeline was successful
ci/woodpecker/pr/build-firmware/2 Pipeline was successful
ci/woodpecker/pr/build-firmware/5 Pipeline was successful
ci/woodpecker/pr/build-firmware/1 Pipeline was successful
ci/woodpecker/pr/build-firmware/11 Pipeline was successful
ci/woodpecker/pr/build-firmware/10 Pipeline was successful
ci/woodpecker/pr/build-firmware/8 Pipeline was successful
ci/woodpecker/pr/build-firmware/9 Pipeline was successful
ci/woodpecker/pr/build-firmware/7 Pipeline was successful
ci/woodpecker/pr/build-firmware/12 Pipeline was successful
ci/woodpecker/pr/build-firmware/13 Pipeline was successful
ci/woodpecker/pr/build-firmware/18 Pipeline failed
ci/woodpecker/pr/build-firmware/16 Pipeline was successful
ci/woodpecker/pr/build-firmware/19 Pipeline was successful
ci/woodpecker/pr/build-firmware/14 Pipeline was successful
ci/woodpecker/pr/build-firmware/17 Pipeline was successful
ci/woodpecker/pr/build-firmware/15 Pipeline was successful
ci/woodpecker/pr/build-firmware/20 Pipeline was successful
ci/woodpecker/pr/build-linux/1 Pipeline was successful
ci/woodpecker/pr/build-linux/2 Pipeline was successful
ci/woodpecker/pr/build-windows Pipeline was successful
to 92f664e51e
Some checks failed
ci/woodpecker/pr/build-firmware/15 Pipeline was successful
ci/woodpecker/pr/build-firmware/19 Pipeline was successful
ci/woodpecker/pr/build-firmware/16 Pipeline was successful
ci/woodpecker/pr/build-firmware/18 Pipeline failed
ci/woodpecker/pr/build-firmware/17 Pipeline was successful
ci/woodpecker/pr/build-firmware/20 Pipeline was successful
ci/woodpecker/pr/build-windows Pipeline was successful
ci/woodpecker/push/build-firmware/3 Pipeline was successful
ci/woodpecker/push/build-firmware/2 Pipeline was successful
ci/woodpecker/push/build-firmware/5 Pipeline was successful
ci/woodpecker/push/build-firmware/4 Pipeline was successful
ci/woodpecker/push/build-firmware/1 Pipeline was successful
ci/woodpecker/push/build-firmware/6 Pipeline was successful
ci/woodpecker/push/build-firmware/7 Pipeline was successful
ci/woodpecker/push/build-firmware/13 Pipeline was successful
ci/woodpecker/push/build-firmware/8 Pipeline was successful
ci/woodpecker/push/build-firmware/14 Pipeline was successful
ci/woodpecker/push/build-firmware/15 Pipeline was successful
ci/woodpecker/push/build-firmware/11 Pipeline was successful
ci/woodpecker/push/build-firmware/12 Pipeline was successful
ci/woodpecker/push/build-firmware/10 Pipeline was successful
ci/woodpecker/push/build-firmware/9 Pipeline was successful
ci/woodpecker/push/build-linux/1 Pipeline was successful
ci/woodpecker/push/build-firmware/16 Pipeline was successful
ci/woodpecker/push/build-firmware/18 Pipeline failed
ci/woodpecker/push/build-linux/2 Pipeline was successful
ci/woodpecker/push/build-firmware/17 Pipeline was successful
ci/woodpecker/push/build-firmware/19 Pipeline was successful
ci/woodpecker/push/build-firmware/20 Pipeline was successful
ci/woodpecker/push/build-windows Pipeline was successful
2026年04月20日 13:51:21 +02:00
Compare
esden left a comment
Copy link

LGTM

Tested with my project setup here and can confirm that it works now. :)

LGTM Tested with my project setup here and can confirm that it works now. :)
esden deleted branch fix/bmdu-uart-auto-txrx-swapping 2026年04月21日 02:31:07 +02:00
Sign in to join this conversation.
No reviewers
Labels
Clear labels
BMD App
Black Magic Debug App (aka. PC hosted) (not firmware)
BMP Firmware
Black Magic Probe Firmware (not PC hosted software)
Bug
Confirmed bug
Build system
Build system
Can't reproduce
Maintainers can't reproduce this problem
CI
Continuous Integration System
Contribution wanted
User contributions welcome
Documentation
Project documentation
Draft
Work in progress draft
Duplicate
This issue or pull request already exists
Enhancement
General project improvement
Feedback wanted
Requires additional submitter feedback
Foreign Host Board
Non Native hardware to runing Black Magic firmware on
GDB
Issue/PR related to GDB
Good first issue
Good for newcommers
HwIssue Mitigation
Solving or mitigating a Hardware issue in Software
Information Needed
Maintainers need more information
NativeHardware
Official Black Magic Debug Hardware
New Host Board
New hardware to run Black Magic firmware on
New Target
New debug target
Off Topic
Something that does not involve the project in any way
Potential Bug
A potential, unconfirmed or very special circumstance bug
Regression
Bug caused by a regression
User Interest Needed
More user interest required before consideration
User Testing Needed
Looking for user testing reports
Won't fix
Outside of the project scope or works as intended
Milestone
Clear milestone
No items
No milestone
Projects
Clear projects
No items
No project
Assignees
Clear assignees
No assignees
2 participants
Notifications
Due date
The due date is invalid or out of range. Please use the format "yyyy-mm-dd".

No due date set.

Dependencies

No dependencies set.

Reference
blackmagic-debug/blackmagic!2233
Reference in a new issue
blackmagic-debug/blackmagic
No description provided.
Delete branch "fix/bmdu-uart-auto-txrx-swapping"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?