espressif/boards/lilygo_tdongle_s3/board.c: flip brightness sense

[dhalbert]

• Fixes T-Dongle S3 Display Brightness is inverted #10749.

@Mandred @freemansoft Could you check the artifact from this PR? I don't have this board to test. Thanks.

[tannewt]

Code is fine. Not merging until we hear from someone who tested it.

[freemansoft]

How do I test this if it isn't merged? I forgot how this works. Are there build images to download?

[todbot]

Short answer: download the lilygo_tdongle_s3 file here https://github.com/adafruit/circuitpython/actions/runs/28718009010#artifacts

Longer answer: any time there is a PR (like there is here, 6b3ff04), click on it and go to the "Checks" tab. From there, click on the "Build CI" check and you'll get a new page with an "Artifacts" heading at the top. In this case there are 7 artifacts. If you click on that "7" you'll be scrolled down to the bottom of the page where the various artifacts for the "Build CI" check. One of those artifacts is the built firmware for your board as a .zip file. Download that, unzip it, and you should find a .UF2 or .BIN file.

[freemansoft]

LGTM

Build artifacts validated: Passed

Steps

1. Verified version prior to test reported Adafruit CircuitPython 10.0.3-4-gc9465b3454 on 2026-01-06; LILYGO T-Dongle S3 with ESP32S3
2. Downloaded Artifact https://github.com/adafruit/circuitpython/actions/runs/28718009010#artifacts
3. Flashed the new .bin bootloader in the archive using https://adafruit.github.io/Adafruit_WebSerial_ESPTool/ and the bin file from the zip archive build artifact. Erased device using the tool prior to installing the new bootloader
4. On startup the boot message shows version Adafruit CircuitPython 10.3.0-alpha.3-11-g1868df28ab on 2026-07-04; LILYGO T-Dongle S3 with ESP32S3

Results

• REPL now visible on built-in display.
• "Hello World!" appears on display
• All files were erased as part of the installation, so no left over artifacts on the drive to taint the tests.

Note:
I thought the bin file was a bootloader and didn't realize it was circuitpython. I thought I'd have to drop the uf2 into a directory or something after using the bin file.

[dhalbert]

@freemansoft Thank you for testing! I linked the artifact in the OP but it was subtle. Thanks @todbot for explaining where to find them.