people_flow_counter_mlx90640: migrate to SiSDK 2025.12 and refresh BLE/host tooling by Silabs-fzszekely · Pull Request #13 · SiliconLabsSoftware/machine_learning_applications

Silabs-fzszekely · 2026-04-20T12:42:33Z

Summary

This PR migrates application/vision/people_flow_counter_mlx90640 to the SiSDK 2025.12 flow and updates the surrounding extension metadata, documentation, Bluetooth handling, and host-side tooling needed to keep the example usable.

What changed

Extension and SDK metadata

updated machine_learning_applications.slsdk for SiSDK 2025.12
updated machine_learning_applications.slce
- removed legacy .slce schema usage
- added required vendor: "silabs"

Example project generation

updated application/vision/people_flow_counter_mlx90640/people_flow_counter_mlx90640.slcp
removed legacy sdk_extension usage from the app project metadata
aligned the example with the current SiSDK 2025.12 generation flow

Bluetooth and firmware-side example fixes

updated application/vision/people_flow_counter_mlx90640/bluetooth.c
cleaned up BLE handling in the example application
addressed BLE-related warning cleanup and connection stability issues found during migration work
included fixes intended to reduce periodic connection drop behavior seen during the host-display workflow

Host-side visualization and transport tooling

updated the Python host tools under application/vision/people_flow_counter_mlx90640/misc/
improved the BLE visualization flow used to render the camera feed and inference output on the host
hardened the BLE reader / transport path used by the visualization scripts
improved separation of shared display / parsing logic via display_serial_core.py
refreshed the BLE server/client-side tooling:
- display_serial_ble.py
- display_serial_ble_server.py
- display_serial_core.py
kept the host-side scripts as source-repo utilities rather than generated firmware project output

Documentation and repo hygiene

updated the top-level README.md for the SiSDK 2025.12 / Studio v6 workflow
updated application/vision/people_flow_counter_mlx90640/README.md for the current build, flash, BLE, serial, and host-tool workflow
updated .gitignore for generated artifacts and helper files
included Dockerfile fixes needed for the updated environment

Validation

Validated on:

Simplicity SDK (SiSDK) 2025.12.2
Silicon Labs AI/ML 2.2.1
Simplicity Studio v6
target board: BRD2601B

Validation performed:

Simplicity Studio project generation succeeds for people_flow_counter_mlx90640
generated project builds successfully
repo-level README reflects the migrated SiSDK 2025.12 / Studio v6 workflow
app-level README reflects the current build/flash and host-tool workflow

Notes

Studio / VS Code schema validation may still report stale .slce errors around missing sdk or rejecting vendor; successful project generation is the authoritative check.
The Python scripts under application/vision/people_flow_counter_mlx90640/misc/ remain host-side tools and are not part of generated firmware output.
A successful build confirms migration and project-generation correctness, but does not by itself prove full runtime or hardware validation.

Minor fix Signed-off-by: silabs-laszlodebreczeni <laszlo.debreczeni@silabs.com>

Signed-off-by: silabs-laszlodebreczeni <laszlo.debreczeni@silabs.com>

github-actions · 2026-04-20T12:42:46Z

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❌ McDowell Victor (@Ferencz) Zoltán Székely
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Raashid Ansari (silabs-raashid)

Thank you for the PR.

The requirements.txt file needs package versions updated because the python files under misc/ do not work. Here is what works:

async-timeout==5.0.1
bleak==3.0.2
certifi==2026.4.22
contourpy==1.3.3
cycler==0.12.1
fonttools==4.62.1
imageio==2.37.3
imageio-ffmpeg==0.6.0
kiwisolver==1.5.0
matplotlib==3.10.9
numpy==2.4.4
packaging==26.2
pillow==12.2.0
pip==26.1.1
pyobjc-core==12.1
pyobjc-framework-cocoa==12.1
pyobjc-framework-corebluetooth==12.1
pyobjc-framework-libdispatch==12.1
pyparsing==3.3.2
pyserial==3.5
python-dateutil==2.9.0.post0
scipy==1.17.1
setuptools==82.0.1
six==1.17.0
typing-extensions==4.15.0
wheel==0.47.0

Raashid Ansari (silabs-raashid) · 2026-05-07T03:21:16Z

+
+import imageio
+import numpy as np
+from scipy.ndimage import gaussian_filter, zoom


please add scipy as one of the dependencies in the requirements.txt

Raashid Ansari (silabs-raashid)

A few minor comments need to be addressed. Otherwise the PR looks good.

Raashid Ansari (silabs-raashid) · 2026-06-23T20:37:50Z

+/generated/
+/autogen/


these seem like they are local to your path. I recommend removing them.

Raashid Ansari (silabs-raashid) · 2026-06-23T20:38:46Z

+/autogen/
+pkg.lock
+*.slconf
+tmp_slconf/


This seems like a local temp directory. I recommend removing this.

Raashid Ansari (silabs-raashid) · 2026-06-23T20:40:04Z

+<ul>
+    <li><b>L</b> and <b>R</b> are the number of people that have crossed from right to left and left to right respectively.</li>
+    <li><b>T</b> is the number of people that have crossed from left to right and not yet crossed back.</li>
+    <li><b>Present</b> is the number of people (the number of bounding boxes) currently detected by the model on the full image.</li>


nitpick: recommend converting this to markdown.

Raashid Ansari (silabs-raashid) · 2026-06-23T21:01:47Z

+  -p people_flow_counter_mlx90640.slcp \
+  --with brd2601b \
+  --sdk-package-path "<path-to-simplicity-sdk>,<path-to-machine_learning_applications>,<path-to-aiml>" \
+  -d people_flow_counter_mlx90640_brd2601b \


Suggested change

-d people_flow_counter_mlx90640_brd2601b \

-d people_flow_counter_mlx90640_brd2601b/cmake_gcc \

Raashid Ansari (silabs-raashid) · 2026-06-23T21:14:02Z

 sdk_extension:
  - id: machine_learning_applications
-    version: "1.1.0"
-  - id: aiml
-    version: 2.1.2
+  - vendor: silabs
+    id: aiml


This whole section can be ommitted.

Raashid Ansari (silabs-raashid) · 2026-06-23T21:41:21Z

Also, adding a pkg.slt file will help the CLI on the CI to download the right dependencies for the project.

Ferencz Zoltán Székely and others added 13 commits April 16, 2026 20:29

migrate project metadata to SiSDK 2025.12

361fca4

finalize SiSDK 2025.12 migration metadata

88e59f9

fix BLE warnings and fix periodic connection drop

cf20e40

BLE connection bug fix and code improvement

73536c3

harden BLE serial reader for file-backed transport

b2534c6

harden and improve BLE serial display pipeline

1b9f69f

Fix people flow example SLCP generation

11d94dd

Update README for SiSDK 2025.12 workflow

d8528de

Update README.md

bd79ce8

Minor fix Signed-off-by: silabs-laszlodebreczeni <laszlo.debreczeni@silabs.com>

Update README.md

f8cea0d

Signed-off-by: silabs-laszlodebreczeni <laszlo.debreczeni@silabs.com>

Update README for SiSDK 2025.12 and Studio v6

ba133df

Dockerfile fixes

eff78ee

Update people flow counter app-level README

1567649

Silabs-fzszekely requested a review from a team as a code owner April 20, 2026 12:42

Raashid Ansari (silabs-raashid) reviewed May 7, 2026

View reviewed changes

Raashid Ansari (silabs-raashid) previously approved these changes Jun 23, 2026

View reviewed changes

Raashid Ansari (silabs-raashid) dismissed their stale review via 4e36215 June 23, 2026 22:10

Raashid Ansari (silabs-raashid) force-pushed the migration/people-flow-counter-mlx90640-sisdk-2025-12 branch 5 times, most recently from 6feb45e to 1567649 Compare June 23, 2026 22:51

Raashid Ansari (silabs-raashid) added 2 commits June 23, 2026 19:01

remove sdk_extension

b170dd6

fix CI with SLT based project setup and build

0b5ad22

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people_flow_counter_mlx90640: migrate to SiSDK 2025.12 and refresh BLE/host tooling#13

people_flow_counter_mlx90640: migrate to SiSDK 2025.12 and refresh BLE/host tooling#13
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	-d people_flow_counter_mlx90640_brd2601b \
	-d people_flow_counter_mlx90640_brd2601b/cmake_gcc \

		/generated/
		/autogen/

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Silabs-fzszekely commented Apr 20, 2026

Summary

What changed

Extension and SDK metadata

Example project generation

Bluetooth and firmware-side example fixes

Host-side visualization and transport tooling

Documentation and repo hygiene

Validation

Notes

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