Add espnow-proxy build to ci

(Setting alpha = 1 efficiently disables the filter.)
Filtering does more harm than good in voltage monitoring.

.github/workflows/build.yml

@@ -10,29 +10,23 @@ on:
 jobs:
   build_linux:
     runs-on: ubuntu-latest
-    env:
-        ARDUINO_SKETCH_ALWAYS_EXPORT_BINARIES: 1
     steps:
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Install Arduino CLI
       run: curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | BINDIR=/usr/local/bin sh
-    - name: Build firmware for ESP32
+    - name: Build firmware
+      env:
+        ARDUINO_SKETCH_ALWAYS_EXPORT_BINARIES: 1
       run: make
-    - name: Build firmware for ESP32-C3
-      run: make BOARD=esp32:esp32:esp32c3
-    - name: Build firmware for ESP32-S3
-      run: make BOARD=esp32:esp32:esp32s3:CDCOnBoot=cdc
-    - name: Build firmware for ESP32-S3 with QSPI PSRAM
-      run: make BOARD=esp32:esp32:esp32s3:CDCOnBoot=cdc,PSRAM=enabled EXTRA=--output-dir=flix/build/esp32.esp32.esp32s3.qspi
-    - name: Build firmware for ESP32-S3 with OPI PSRAM
-      run: make BOARD=esp32:esp32:esp32s3:CDCOnBoot=cdc,PSRAM=opi EXTRA=--output-dir=flix/build/esp32.esp32.esp32s3.opi
-    - name: Build firmware for Flix2
-      run: make BOARD=esp32:esp32:esp32s3:FlashSize=4M,CDCOnBoot=cdc,PSRAM=opi EXTRA='--build-property "compiler.cpp.extra_flags=-DFLIX2" --output-dir=flix/build/esp32.esp32.flix2'
     - name: Upload binaries
-      uses: actions/upload-artifact@v7
+      uses: actions/upload-artifact@v4
       with:
         name: firmware-binary
         path: flix/build
+    - name: Build firmware for ESP32-C3
+      run: make BOARD=esp32:esp32:esp32c3
+    - name: Build firmware for ESP32-S3
+      run: make BOARD=esp32:esp32:esp32s3
     - name: Build espnow-proxy
       run: arduino-cli compile --fqbn esp32:esp32:esp32 tools/espnow-proxy
     - name: Check c_cpp_properties.json
@@ -41,7 +35,7 @@ jobs:
   build_macos:
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Install Arduino CLI
       run: brew install arduino-cli
     - name: Build firmware
@@ -52,7 +46,7 @@ jobs:
   build_windows:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Install Arduino CLI
       run: choco install arduino-cli
     - name: Install Make
@@ -72,8 +66,8 @@ jobs:
         apt-get update
         DEBIAN_FRONTEND=noninteractive apt-get install -y curl wget build-essential cmake g++ pkg-config gnupg2 lsb-release sudo
     - name: Install Arduino CLI
-      run: curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | BINDIR=/usr/local/bin sh
+      uses: arduino/setup-arduino-cli@v1.1.1
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Install Gazebo
       run: |
         sudo sh -c 'echo "deb http://packages.osrfoundation.org/gazebo/ubuntu-stable `lsb_release -cs` main" > /etc/apt/sources.list.d/gazebo-stable.list'
@@ -84,16 +78,7 @@ jobs:
       run: sudo apt-get install -y libsdl2-dev
     - name: Build simulator
       run: make build_simulator
-    - name: Run simulator
+    - uses: actions/upload-artifact@v4
-      env:
-        GAZEBO_MODEL_PATH: ${{ github.workspace }}/gazebo/models
-        GAZEBO_PLUGIN_PATH: ${{ github.workspace }}/gazebo/build
-      run: |
-        OUT=$(timeout -k 10s 120s gzserver --verbose gazebo/flix.world 2>&1 | tee /dev/stderr)
-        if echo "$OUT" | grep -Pq "\[Err\](?! \[RenderEngine)"; then
-          exit 1
-        fi
-    - uses: actions/upload-artifact@v7
       with:
         name: gazebo-plugin-binary
         path: gazebo/build/*.so
@@ -105,7 +90,7 @@ jobs:
     steps:
     - name: Install Arduino CLI
       run: brew install arduino-cli
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Clean up python binaries # Workaround for https://github.com/actions/setup-python/issues/577
       run: |
         rm -f /usr/local/bin/2to3*

.github/workflows/docs.yml

@@ -8,7 +8,6 @@ on:
 
 permissions:
   contents: read
-  actions: read
   pages: write
   id-token: write
 
@@ -16,7 +15,7 @@ jobs:
   markdownlint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Install markdownlint
       run: npm install -g markdownlint-cli2
     - name: Run markdownlint
@@ -25,57 +24,19 @@ jobs:
   build_book:
     runs-on: ubuntu-latest
     needs: markdownlint
-    env:
-      BINARIES: ${{ github.event_name == 'push' && (github.ref_name == 'master' || github.ref_name == 'dev') && github.repository == 'okalachev/flix' }}
     steps:
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Install mdBook
       run: cargo install mdbook --vers 0.4.43 --locked
     - name: Build book
       run: cd docs && mdbook build
-    - name: Wait for Build to complete
-      if: ${{ env.BINARIES }}
-      uses: lewagon/wait-on-check-action@v1.9.1
-      with:
-        ref: ${{ github.sha }}
-        check-name: build_linux
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-        wait-interval: 30
-    - name: Find firmware binaries
-      if: ${{ env.BINARIES }}
-      id: build_run
-      run: |
-        RUN_ID=$(gh api "repos/${{ github.repository }}/actions/workflows/build.yml/runs?head_sha=${{ github.sha }}&per_page=1" --jq '.workflow_runs[0].id')
-        echo "id=$RUN_ID" >> $GITHUB_OUTPUT
-      env:
-        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    - name: Download firmware binaries
-      if: ${{ env.BINARIES }}
-      uses: actions/download-artifact@v7
-      with:
-        github-token: ${{ secrets.GITHUB_TOKEN }}
-        repository: ${{ github.repository }}
-        run-id: ${{ steps.build_run.outputs.id }}
-        name: firmware-binary
-        path: docs/build
-    - name: Create shortcuts for firmware binaries
-      if: ${{ env.BINARIES }}
-      working-directory: docs/build
-      run: |
-        for FQBN in esp32.esp32.*; do
-          zip -r $FQBN.zip $FQBN
-          BOARD="${FQBN#esp32.esp32.}"
-          ln -s "$FQBN/flix.ino.merged.bin" "flix.$BOARD.merged.bin"
-          ln -s "$FQBN/flix.ino.bin" "flix.$BOARD.bin"
-          ln -s "$FQBN/flix.ino.bootloader.bin" "flix.$BOARD.bootloader.bin"
-        done
     - name: Upload artifact
-      uses: actions/upload-pages-artifact@v5
+      uses: actions/upload-pages-artifact@v3
       with:
         path: docs/build
 
   deploy:
-    if: ${{ github.event_name == 'push' && github.ref_name == 'master' }}
+    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
     concurrency:
       group: "pages"
       cancel-in-progress: true
@@ -87,4 +48,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v5
+        uses: actions/deploy-pages@v4

.github/workflows/tools.yml

@@ -10,7 +10,7 @@ jobs:
   csv_to_ulog:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Build csv_to_ulog
       run: cd tools/csv_to_ulog && mkdir build && cd build && cmake .. && make
     - name: Test csv_to_ulog
@@ -22,13 +22,13 @@ jobs:
   pyflix:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Install Python build tools
       run: pip install build
     - name: Build pyflix
       run: python3 -m build tools
     - name: Upload artifacts
-      uses: actions/upload-artifact@v7
+      uses: actions/upload-artifact@v4
       with:
         name: pyflix
         path: |
@@ -37,7 +37,7 @@ jobs:
   python_tools:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
     - name: Install Python dependencies
       run: pip install -r tools/requirements.txt
     - name: Test csv_to_mcap tool
@@ -46,23 +46,3 @@ jobs:
         echo -e "t,x,y,z\n0,1,2,3\n1,4,5,6" > log.csv
         ./csv_to_mcap.py log.csv
         test $(stat -c %s log.mcap) -eq 883
-  sloc:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v7
-    - run: sudo apt-get install -y cloc jq
-    - name: Print source lines of code
-      run: cloc --by-file-by-lang flix
-    - name: Checkout previous revision
-      uses: actions/checkout@v7
-      with:
-        ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.sha || github.event.before }}
-        path: prev
-    - name: Annotate total source lines
-      run: |
-        SLOC_CURR=$(cloc flix --json | jq -r '.SUM.code')
-        SLOC_PREV=$(cloc prev/flix --json | jq -r '.SUM.code')
-        DIFF=$(printf '%+d' "$((SLOC_CURR - SLOC_PREV))")
-        echo "* Current SLOC: $SLOC_CURR" >> $GITHUB_STEP_SUMMARY
-        echo "* Previous SLOC: $SLOC_PREV" >> $GITHUB_STEP_SUMMARY
-        echo "* Diff: $DIFF" >> $GITHUB_STEP_SUMMARY

Makefile

@@ -1,13 +1,13 @@
-BOARD = esp32:esp32:esp32
+BOARD = esp32:esp32:d1_mini32
 PORT := $(strip $(wildcard /dev/serial/by-id/usb-Silicon_Labs_CP21* /dev/serial/by-id/usb-1a86_USB_Single_Serial_* /dev/cu.usbserial-* /dev/cu.usbmodem*))
 
 export ARDUINO_NETWORK_CONNECTION_TIMEOUT := 1h
 
 build: .core .libs
-	arduino-cli compile flix --fqbn $(BOARD) --build-property "build.core_debug_level=1" $(EXTRA)
+	arduino-cli compile --fqbn $(BOARD) --build-property "build.core_debug_level=1" flix
 
 upload: build
-	arduino-cli upload flix --fqbn $(BOARD) -p "$(PORT)"
+	arduino-cli upload --fqbn $(BOARD) -p "$(PORT)" flix
 
 erase:
 	arduino-cli burn-bootloader --fqbn $(BOARD) -p "$(PORT)" -P esptool
@@ -27,8 +27,8 @@ libs .libs:
 	touch .libs
 
 upload_proxy: .core .libs
-	arduino-cli compile tools/espnow-proxy --fqbn $(BOARD)
+	arduino-cli compile --fqbn $(BOARD) tools/espnow-proxy
-	arduino-cli upload tools/espnow-proxy --fqbn $(BOARD) -p "$(PORT)"
+	arduino-cli upload --fqbn $(BOARD) -p "$(PORT)" tools/espnow-proxy
 
 gazebo/build cmake: gazebo/CMakeLists.txt
 	mkdir -p gazebo/build

README.md

@@ -55,12 +55,6 @@ Outdoor flights demo video of the current prototype:
 
 <a href="https://youtu.be/KXlNmvUTi4g"><img width=300 src="https://i3.ytimg.com/vi/KXlNmvUTi4g/maxresdefault.jpg"></a>
 
-### Position control
-
-The position control feature is in development. RoboCamp 2026 demo (using an overhead camera, [sources](https://github.com/xTimop/flix-poscontrol/compare/robolager2026...xTimop:flix-poscontrol:poscontrol)):
-
-<a href="https://youtu.be/369Xowm4HcU"><img width=300 src="https://i3.ytimg.com/vi/369Xowm4HcU/maxresdefault.jpg"></a>
-
 ## Simulation
 
 The simulator is implemented using Gazebo and runs the original Arduino code:
@@ -90,7 +84,7 @@ Additional articles:
 |*Boost converter (optional, for more stable power supply)*|*5V output*|<img src="docs/img/buck-boost.jpg" width=100>|1|
 |Motor|8520 3.7V brushed motor.<br>Motor with exact 3.7V voltage is needed, not ranged working voltage (3.7V — 6V).<br>Make sure the motor shaft diameter and propeller hole diameter match!|<img src="docs/img/motor.jpeg" width=100>|4|
 |Propeller|55 mm or 65 mm|<img src="docs/img/prop.jpg" width=100>|4|
-|MOSFET (transistor)|UMW 100N03A or [analog](https://t.me/opensourcequadcopter/33).<br>Warning: don't use KIA 100N03A or other manufacturers, they might not work!|<img src="docs/img/100n03a.jpg" width=100>|4|
+|MOSFET (transistor)|100N03A or [analog](https://t.me/opensourcequadcopter/33)|<img src="docs/img/100n03a.jpg" width=100>|4|
 |Pull-down resistor<br>Voltage measurement resistor|10 kΩ|<img src="docs/img/resistor10k.jpg" width=100>|6|
 |3.7V Li-Po battery|LW 952540 (or any compatible by the size).<br>Make sure the battery has enough discharge rate — 25C or more!|<img src="docs/img/battery.jpg" width=100>|1|
 |Battery connector cable|MX2.0 2P female|<img src="docs/img/mx.png" width=100>|1|

docs/book/firmware.md

@@ -31,7 +31,7 @@
 
 * [`vector.h`](https://github.com/okalachev/flix/blob/master/flix/vector.h), [`quaternion.h`](https://github.com/okalachev/flix/blob/master/flix/quaternion.h) — библиотеки векторов и кватернионов.
 * [`pid.h`](https://github.com/okalachev/flix/blob/master/flix/pid.h) — ПИД-регулятор.
-* [`filter.h`](https://github.com/okalachev/flix/blob/master/flix/filter.h) — фильтр нижних частот.
+* [`lpf.h`](https://github.com/okalachev/flix/blob/master/flix/lpf.h) — фильтр нижних частот.
 
 ### Подсистема управления
 

docs/firmware.md

@@ -34,7 +34,7 @@ Utility files:
 
 * [`vector.h`](../flix/vector.h), [`quaternion.h`](../flix/quaternion.h) — vector and quaternion libraries.
 * [`pid.h`](../flix/pid.h) — generic PID controller.
-* [`filter.h`](../flix/filter.h) — generic low-pass filter.
+* [`lpf.h`](../flix/lpf.h) — generic low-pass filter.
 
 ### Control subsystem
 

docs/usage.md

@@ -1,48 +1,20 @@
 # Usage: build, setup and flight
 
-To fly Flix quadcopter, you need to upload the firmware to the ESP32 board, and set up the drone for flight.
+To fly Flix quadcopter, you need to build the firmware, upload it to the ESP32 board, and set up the drone for flight.
 
-## Uploading the firmware
+To get the firmware sources, clone the repository using git:
-
-You can either use the **prebuilt binaries** or **build the firmware** from sources — this will let you modify the firmware and add new features.
-
-### Prebuilt binaries (the easiest way)
-
-1. Download the latest firmware file using the following links:
-
-   <!-- markdownlint-disable MD044 -->
-   |Type|Boards|Link|
-   |-|-|-|
-   |ESP32|DevKit, D1 Mini|[`quadcopter.dev/flix.esp32.merged.bin`](https://quadcopter.dev/flix.esp32.merged.bin)|
-   |ESP32-S3|Most S3 based|[`quadcopter.dev/flix.esp32s3.merged.bin`](https://quadcopter.dev/flix.esp32s3.merged.bin)|
-   |ESP32-S3 (2MB PSRAM)|S3 Super Mini, S3 Zero (2MB PSRAM)|[`quadcopter.dev/flix.esp32s3.qspi.merged.bin`](https://quadcopter.dev/flix.esp32s3.qspi.merged.bin)|
-   |ESP32-S3 (8/16MB PSRAM)|S3 Zero (8MB PSRAM)|[`quadcopter.dev/flix.esp32s3.opi.merged.bin`](https://quadcopter.dev/flix.esp32s3.opi.merged.bin)|
-   |ESP32-C3|C3 Super Mini|[`quadcopter.dev/flix.esp32c3.merged.bin`](https://quadcopter.dev/flix.esp32c3.merged.bin)|
-   |Flix2|Flix2 board|[`quadcopter.dev/flix.flix2.merged.bin`](https://quadcopter.dev/flix.flix2.merged.bin)|
-   <!-- markdownlint-enable MD044 -->
-
-2. Flash your ESP32 board using [ESP32 Web Flasher](https://www.espboards.dev/tools/program/):
-
-   <img src="img/web-flasher.png" width="400">
-
-   * Connect the board to your computer, press *Connect to ESP*, choose the serial port.
-   * Go to the *Flash* tab.
-   * Choose the downloaded firmware file, set *Flash address* to *0* (important).
-   * Click *Program* button and wait until the process is finished.
-
-### Building from sources (flexible)
-
-You can build and upload the firmware using either **Arduino IDE** (easier for beginners) or **command line**.
-
-Get the sources using git:
 
 ```bash
 git clone https://github.com/okalachev/flix.git && cd flix
 ```
 
-Beginners can [download the sources as a ZIP archive](https://github.com/okalachev/flix/archive/refs/heads/master.zip).
+Beginners can [download the source code as a ZIP archive](https://github.com/okalachev/flix/archive/refs/heads/master.zip).
 
-#### Arduino IDE (Windows, Linux, macOS)
+## Building the firmware
+
+You can build and upload the firmware using either **Arduino IDE** (easier for beginners) or **command line**.
+
+### Arduino IDE (Windows, Linux, macOS)
 
 <img src="img/arduino-ide.png" width="400" alt="Flix firmware open in Arduino IDE">
 
@@ -53,11 +25,11 @@ Beginners can [download the sources as a ZIP archive](https://github.com/okalach
    * `FlixPeriph`, the latest version.
    * `MAVLink`, version 2.0.25.
 5. Open the `flix/flix.ino` sketch from downloaded firmware sources in Arduino IDE.
-6. Connect your ESP32 board to the computer and choose correct board type in Arduino IDE (*WEMOS D1 MINI ESP32* for ESP32 Mini, *ESP32S3 Dev Module* for ESP32-S3 Super Mini) and the port.
+6. Connect your ESP32 board to the computer and choose correct board type in Arduino IDE (*WEMOS D1 MINI ESP32* for ESP32 Mini) and the port.
 7. Set *Tools* ⇒ *Core Debug Level* to *Error* to see the errors in the serial console. Set *Tools* ⇒ *USB CDC on Boot* to *Enabled* for ESP32-S3/ESP32-C3 boards.
 8. [Build and upload](https://docs.arduino.cc/software/ide-v2/tutorials/getting-started/ide-v2-uploading-a-sketch) the firmware using Arduino IDE.
 
-#### Command line (Windows, Linux, macOS)
+### Command line (Windows, Linux, macOS)
 
 1. [Install Arduino CLI](https://arduino.github.io/arduino-cli/installation/).
 
@@ -124,7 +96,7 @@ To access the console using serial port:
 To access the console using QGroundControl:
 
 1. Connect to the drone using QGroundControl app.
-2. Go to the QGroundControl menu ⇒ *Analyze Tools* ⇒ *MAVLink Console*.
+2. Go to the QGroundControl menu ⇒ *Vehicle Setup* ⇒ *Analyze Tools* ⇒ *MAVLink Console*.
 
 <img src="img/cli.png" width="400">
 
@@ -141,14 +113,16 @@ You can also work with parameters using `p` command in the console. Parameter na
 
 ### Configure the IMU
 
-1. Configure the following parameters for the IMU:
+1. Configure the following parameters for the used IMU:
-   * `IMU_MODEL` — IMU model (1 for MPU-9250/MPU-6500, 2 for ICM-20948, 3 for MPU-6050, 4 for ICM-40609-D).
+   * `IMU_MODEL` — IMU model (0 for disabled, 1 for MPU-9250/MPU-6500¹, 2 for ICM-20948, 3 for MPU-6050, 4 for ICM-40609-D).
    * `IMU_BUS` — communication bus (0 for SPI, 1 for I²C).
    * `IMU_PIN_SCK`, `IMU_PIN_MISO`, `IMU_PIN_MOSI`, `IMU_PIN_CS` — SPI pin numbers.
    * `IMU_PIN_SCL`, `IMU_PIN_SDA` — I²C pin numbers.
    * `IMU_PIN_INT` — IMU data ready pin number (-1 if not used).
 2. Reboot the drone.
-3. Check the IMU is working using `imu` command in the console (should print `status: OK`).
+3. Check the IMU is working using `imu` command in the console (see details below).
+
+¹ — not to be confused with MPU-6050.
 
 ### Define IMU orientation
 
@@ -178,9 +152,9 @@ Before flight you need to calibrate the accelerometer:
 
 If using non-default motor pins, set the pin numbers using the parameters: `MOTOR_PIN_FL`, `MOTOR_PIN_FR`, `MOTOR_PIN_RL`, `MOTOR_PIN_RR` (front-left, front-right, rear-left, rear-right respectively).
 
-#### Brushless motors
+Certain ESP32 models (such as ESP32-S3 and ESP32-C3) support a lower maximum PWM frequency; on these boards the parameter `MOT_PWM_FREQ` should be set to 38000 Hz.
 
-If using brushless motors with ESCs:
+If using brushless motors and ESCs:
 
 1. Set the appropriate PWM using the parameters: `MOT_PWM_STOP`, `MOT_PWM_MIN`, and `MOT_PWM_MAX` (1000, 1000, and 2000 is typical).
 2. Decrease the PWM frequency using the `MOT_PWM_FREQ` parameter (400 is typical).
@@ -188,7 +162,7 @@ If using brushless motors with ESCs:
 > [!CAUTION]
 > **Remove the props when configuring the motors!** If improperly configured, you may not be able to stop them.
 
-### Battery voltage monitoring (optional)
+### Battery voltage monitoring
 
 ESP32 ADC can measure only up to 3.3 V, so you need to use a voltage divider to monitor the battery voltage. To enable voltage measurement, set the following parameters:
 
@@ -363,7 +337,7 @@ To setup ESP-NOW communication:
 
 1. Flash the second ESP32 board with ESP-NOW proxy sketch: [`tools/espnow-proxy/espnow-proxy.ino`](../tools/espnow-proxy/espnow-proxy.ino). Use Arduino IDE or command line: `make upload_proxy`.
 
-2. Open Serial Monitor in Arduino IDE or use `make monitor` command. The ESP32 will print its MAC address and generated encryption key, for example:
+2. Open Serial Monitor or use `make monitor` command. The ESP32 will print its MAC address and generated encryption key, for example:
 
    ```
    espnow 7a:c8:e3:eb:bf:e9 &PiuSysxP9+$L&5E
@@ -382,10 +356,7 @@ To setup ESP-NOW communication:
    * Type: Serial.
    * Serial Port: choose the port of the proxy ESP32 board, e. g. `/dev/cu.usbserial-0001`.
    * Baud Rate: 115200.
-5. Click *Save*, click *Connect*. QGroundControl should connect to the drone using ESP-NOW and begin showing the telemetry.
+5. Click *Save*. QGroundControl should connect to the drone using ESP-NOW and begin showing the telemetry.
-
-> [!TIP]
-> Make sure Arduino IDE is not running when using ESP-NOW proxy board, as it may block the serial port.
 
 ## Flight log
 

docs/user.md

@@ -4,24 +4,6 @@ This page contains user-built drones based on the Flix project. Publish your pro
 
 ---
 
-Author: [Oleg1405](https://t.me/Oleg1405).<br>
-Description: ESP32 Mini, MPU-6500 IMU, boost converter, BT2.0 power connector, 65 mm props, BetaFPV ELRS Lite Receiver, Radiomaster Pocket + Mavlink Joystick (Android) control.
-
-<img src="img/user/oleg1405/1.jpg" height=300>
-
-[Flight video](https://www.youtube.com/shorts/rbXV4sHbpso).
-
----
-
-Author: Alican Erüst.<br>
-Description: QX95 mm frame, 55 mm propellers, 3.7 V 25C 1050 mAh LiPo battery, MPU6050 IMU, Logitech F310 gamepad controller, with a total quadcopter weight of 66 g.
-
-<img src="img/user/alicanerus/1.jpg" height=200> <img src="img/user/alicanerus/2.jpg" height=200> <img src="img/user/alicanerus/3.jpg" height=200>
-
-[Flight video](https://drive.google.com/file/d/1k0WeWTKnCAfaugkX7LcmNxsUuq79RL8Z/view?usp=sharing).
-
----
-
 Author: [Неруш Михаил](https://t.me/NerushMV).<br>
 Description: custom frame made of 4 mm plywood, 8520 brushed motors, 75 mm propellers, MPU-6500. FlySky FS-i6X with ESP32-based adapter for ESP-NOW communication (using PPM output).<br>
 Sources and materials: [link](https://drive.google.com/drive/folders/1uWiDcuorLrtVs_IIR7Y13omij-7Q1nx8).

flix/cli.ino

@@ -51,7 +51,13 @@ const char* motd =
 "espnow <mac> [<key>] - configure ESP-NOW peer\n"
 "mot - show motor output\n"
 "log [dump] - print log header [and data]\n"
-"mfr/mfl/mrr/mrl [<thrust>] - test motor (remove props)\n"
+"mfr, mfl, mrr, mrl - test motor (remove props)\n"
+"log - show log info\n"
+"log header - show log header\n"
+"log reset - reset log\n"
+"log <name> <rate> - setup log topic rate\n"
+"l <str> - show log values starting with str\n"
+"l expose <name> - expose log value to telemetry\n"
 "sys - show system info\n"
 "reset - reset drone's state\n"
 "reboot - reboot the drone\n";
@@ -153,27 +159,38 @@ void doCommand(String str, bool echo = false) {
 	} else if (command == "mot") {
 		print("front-right %g front-left %g rear-right %g rear-left %g\n",
 			motors[MOTOR_FRONT_RIGHT], motors[MOTOR_FRONT_LEFT], motors[MOTOR_REAR_RIGHT], motors[MOTOR_REAR_LEFT]);
-	} else if (command == "log") {
+	} else if (command == "log" && arg0 == "") {
+		printLogInfo();
+	} else if (command == "log" && arg1 != "") {
+		configLogThrottle(arg0.c_str(), arg1.toFloat());
+	} else if (command == "log" && arg0 == "header") {
 		printLogHeader();
-		if (arg0 == "dump") printLogData();
+	} else if (command == "log" && arg0 == "reset") {
+		resetLog();
+	} else if (command == "l" && arg0 == "expose" && arg1 != "") {
+		exposeLogValue(arg1.c_str());
+	} else if (command == "l") {
+		printLogValues(arg0.c_str());
 	} else if (command == "cr") {
 		calibrateRC();
 	} else if (command == "ca") {
 		calibrateAccel();
 	} else if (command == "mfr") {
-		testMotor(MOTOR_FRONT_RIGHT, arg0.isEmpty() ? 0.2 : arg0.toFloat());
+		testMotor(MOTOR_FRONT_RIGHT);
 	} else if (command == "mfl") {
-		testMotor(MOTOR_FRONT_LEFT, arg0.isEmpty() ? 0.2 : arg0.toFloat());
+		testMotor(MOTOR_FRONT_LEFT);
 	} else if (command == "mrr") {
-		testMotor(MOTOR_REAR_RIGHT, arg0.isEmpty() ? 0.2 : arg0.toFloat());
+		testMotor(MOTOR_REAR_RIGHT);
 	} else if (command == "mrl") {
-		testMotor(MOTOR_REAR_LEFT, arg0.isEmpty() ? 0.2 : arg0.toFloat());
+		testMotor(MOTOR_REAR_LEFT);
 	} else if (command == "sys") {
 #ifdef ESP32
 		print("Chip: %s\n", ESP.getChipModel());
 		print("Temperature: %.1f °C\n", temperatureRead());
 		print("Total RAM: %d KB\n", ESP.getHeapSize() / 1024);
 		print("Free heap: %d KB\n", ESP.getFreeHeap() / 1024);
+		print("PSRAM: %d KB\n", ESP.getPsramSize() / 1024);
+		print("Free PSRAM: %d KB\n", ESP.getFreePsram() / 1024);
 		print("Firmware: " __DATE__ " " __TIME__ "\n");
 		// Print tasks table
 		print("Num  Task                MinSt  Prio  Core  CPU%%\n");

flix/config.h

@@ -1,27 +0,0 @@
-// Copyright (c) 2026 Oleg Kalachev <okalachev@gmail.com>
-// Repository: https://github.com/okalachev/flix
-
-// Parameter defaults
-
-#pragma once
-
-void setDefaults() {
-	// Set defaults here
-
-	#if defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C3)
-		pwmFrequency = 38000;
-	#endif
-
-	#ifdef FLIX2
-		imuModel = 4; // ICM-40609-D
-		imuIntPin = 10;
-		imuCsPin = 14;
-
-		motorPins[MOTOR_REAR_LEFT] = 41;
-		motorPins[MOTOR_REAR_RIGHT] = 7;
-		motorPins[MOTOR_FRONT_RIGHT] = 18;
-		motorPins[MOTOR_FRONT_LEFT] = 38;
-
-		voltagePin = 3;
-	#endif
-}

flix/control.ino

@@ -9,6 +9,31 @@
 #include "filter.h"
 #include "util.h"
 
+#define PITCHRATE_P 0.05
+#define PITCHRATE_I 0.2
+#define PITCHRATE_D 0.001
+#define PITCHRATE_I_LIM 0.3
+#define ROLLRATE_P PITCHRATE_P
+#define ROLLRATE_I PITCHRATE_I
+#define ROLLRATE_D PITCHRATE_D
+#define ROLLRATE_I_LIM PITCHRATE_I_LIM
+#define YAWRATE_P 0.3
+#define YAWRATE_I 0.0
+#define YAWRATE_D 0.0
+#define YAWRATE_I_LIM 0.3
+#define ROLL_P 6
+#define ROLL_I 0
+#define ROLL_D 0
+#define PITCH_P ROLL_P
+#define PITCH_I ROLL_I
+#define PITCH_D ROLL_D
+#define YAW_P 3
+#define PITCHRATE_MAX radians(360)
+#define ROLLRATE_MAX radians(360)
+#define YAWRATE_MAX radians(300)
+#define TILT_MAX radians(30)
+#define RATES_D_LPF_ALPHA 0.2 // cutoff frequency ~ 40 Hz
+
 const int RAW = 0, ACRO = 1, STAB = 2, AUTO = 3; // flight modes
 int mode = STAB;
 bool armed = false;
@@ -19,14 +44,14 @@ Vector ratesExtra; // feedforward rates
 Vector torqueTarget;
 float thrustTarget;
 
-PID rollRatePID(0.05, 0.2, 0.001, 0.3, 0.2);
+PID rollRatePID(ROLLRATE_P, ROLLRATE_I, ROLLRATE_D, ROLLRATE_I_LIM, RATES_D_LPF_ALPHA);
-PID pitchRatePID(0.05, 0.2, 0.001, 0.3, 0.2);
+PID pitchRatePID(PITCHRATE_P, PITCHRATE_I, PITCHRATE_D, PITCHRATE_I_LIM, RATES_D_LPF_ALPHA);
-PID yawRatePID(0.3, 0, 0, 0.3);
+PID yawRatePID(YAWRATE_P, YAWRATE_I, YAWRATE_D);
-PID rollPID(6);
+PID rollPID(ROLL_P, ROLL_I, ROLL_D);
-PID pitchPID(6);
+PID pitchPID(PITCH_P, PITCH_I, PITCH_D);
-PID yawPID(3);
+PID yawPID(YAW_P, 0, 0);
-Vector maxRate(radians(360), radians(360), radians(360));
+Vector maxRate(ROLLRATE_MAX, PITCHRATE_MAX, YAWRATE_MAX);
-float tiltMax = radians(30);
+float tiltMax = TILT_MAX;
 int flightModes[] = {STAB, STAB, STAB}; // map for rc mode switch
 
 extern const int MOTOR_REAR_LEFT, MOTOR_REAR_RIGHT, MOTOR_FRONT_RIGHT, MOTOR_FRONT_LEFT;

flix/estimate.ino

@@ -15,6 +15,12 @@ bool landed;
 float accWeight = 0.003;
 float levelWeight = 0.0002;
 LowPassFilter<Vector> ratesFilter(0.2); // cutoff frequency ~ 40 Hz
+NotchFilter<Vector> ratesNotch(382, 40);
+
+void setupEstimate() {
+	print("Setup estimation\n");
+	ratesNotch.reset();
+}
 
 void estimate() {
 	applyGyro();
@@ -25,6 +31,7 @@ void estimate() {
 void applyGyro() {
 	// filter gyro to get angular rates
 	rates = ratesFilter.update(gyro);
+	rates = ratesNotch.update(rates);
 
 	// apply rates to attitude
 	attitude = Quaternion::rotate(attitude, Quaternion::fromRotationVector(rates * dt));

flix/filter.h

@@ -1,7 +1,7 @@
 // Copyright (c) 2023 Oleg Kalachev <okalachev@gmail.com>
 // Repository: https://github.com/okalachev/flix
 
-// Low pass filter implementation
+// Low pass and notch filters
 
 #pragma once
 
@@ -32,3 +32,67 @@ public:
 private:
 	bool init = false;
 };
+
+template <typename T>
+class NotchFilter {
+public:
+	float frequency;
+	float bandwidth;
+	T output;
+
+	NotchFilter(float frequency, float bandwidth): frequency(frequency), bandwidth(bandwidth) {
+		reset();
+	};
+
+	T update(const T input) {
+		if (frequency <= 0 || bandwidth <= 0) return input;
+
+		if (!init) {
+			init = true;
+			x1 = x2 = input;
+			y1 = y2 = input;
+			return output = input;
+		}
+
+		output = b0 * input + b1 * x1 + b2 * x2 - a1 * y1 - a2 * y2;
+
+		x2 = x1;
+		x1 = input;
+		y2 = y1;
+		y1 = output;
+
+		return output;
+	}
+
+	void reset() {
+		const float dt = 0.001f;
+		float f = frequency;
+		float bw = bandwidth;
+		if (f < 0) f = 0;
+		if (bw < 1e-6f) bw = 1e-6f;
+
+		float q = f / bw;
+		if (q < 1e-3f) q = 1e-3f;
+
+		const float w0 = 2.0f * PI * f * dt;
+		const float c = cos(w0);
+		const float s = sin(w0);
+		const float alpha = s / (2.0f * q);
+
+		const float a0 = 1.0f + alpha;
+		const float invA0 = 1.0f / a0;
+
+		b0 = 1.0f * invA0;
+		b1 = -2.0f * c * invA0;
+		b2 = 1.0f * invA0;
+		a1 = -2.0f * c * invA0;
+		a2 = (1.0f - alpha) * invA0;
+
+		init = false;
+	}
+
+private:
+	float b0, b1, b2, a1, a2;
+	T x1, x2, y1, y2;
+	bool init = false;
+};

flix/flix.ino

@@ -26,6 +26,8 @@ void setup() {
 	setupWiFi();
 	setupIMU();
 	setupRC();
+	setupEstimate();
+	setupLog();
 	setLED(false);
 	print("Initializing complete\n");
 }
@@ -40,6 +42,6 @@ void loop() {
 	handleInput();
 	processMavlink();
 	readVoltage();
-	logData();
+	loopLog();
 	syncParameters();
 }

flix/imu.ino

@@ -10,10 +10,9 @@
 #include "filter.h"
 #include "util.h"
 
-IMU *imu;
+IMU imu;
-int imuModel = -1; // 1 - MPU9250, 2 - ICM20948, 3 - MPU6050, 4 - ICM40609D
+int imuModel = 1, imuBus = 0;
-int imuBus = 0; // 0 - SPI, 1 - I2C
+int imuSckPin = SCK, imuMisoPin = MISO, imuMosiPin = MOSI, imuCsPin = -1, imuIntPin = -1;
-int imuSckPin = SCK, imuMisoPin = MISO, imuMosiPin = MOSI, imuCsPin = SS, imuIntPin = -1;
 int imuSdaPin = SDA, imuSclPin = SCL;
 Vector imuRotation(0, 0, PI / 2); // imu orientation as Euler angles
 
@@ -28,35 +27,30 @@ LowPassFilter<Vector> gyroBiasFilter(0.001);
 
 void setupIMU() {
 	print("Setup IMU\n");
-	free(imu);
+	if (imuBus == 0 && imuCsPin > 0) {
-	if (imuModel == 3) imuBus = 1; // MPU6050 is I2C only
-
-	if (imuBus == 0) {
 		// SPI connection
 		SPI.begin(imuSckPin, imuMisoPin, imuMosiPin);
-		imu = IMU::create(imuModel, SPI, imuCsPin, imuIntPin);
+		imu.begin((IMU::Model)imuModel, SPI, imuCsPin, imuIntPin);
-	} else {
+	} else if (imuBus == 1) {
 		// I2C connection
 		Wire.setPins(imuSdaPin, imuSclPin);
-		imu = IMU::create(imuModel, Wire, imuIntPin);
+		imu.begin((IMU::Model)imuModel, Wire, imuIntPin);
 	}
-
-	imu->begin();
 	configureIMU();
 }
 
 void configureIMU() {
-	imu->setAccelRange(IMU::ACCEL_RANGE_4G);
+	imu.setAccelRange(imu.ACCEL_RANGE_4G);
-	imu->setGyroRange(IMU::GYRO_RANGE_2000DPS);
+	imu.setGyroRange(imu.GYRO_RANGE_2000DPS);
-	imu->setDLPF(IMU::DLPF_MAX);
+	imu.setDLPF(imu.DLPF_MAX);
-	imu->setRate(IMU::RATE_1KHZ_APPROX);
+	imu.setRate(imu.RATE_1KHZ_APPROX);
-	imu->setupInterrupt();
+	imu.setupInterrupt();
 }
 
 void readIMU() {
-	imu->waitForData();
+	imu.waitForData();
-	imu->getGyro(gyro.x, gyro.y, gyro.z);
+	imu.getGyro(gyro.x, gyro.y, gyro.z);
-	imu->getAccel(acc.x, acc.y, acc.z);
+	imu.getAccel(acc.x, acc.y, acc.z);
 	calibrateGyroOnce();
 
 	// Apply scale and bias
@@ -78,7 +72,7 @@ void calibrateGyroOnce() {
 
 void calibrateAccel() {
 	print("Calibrating accelerometer\n");
-	imu->setAccelRange(IMU::ACCEL_RANGE_2G); // the most sensitive mode
+	imu.setAccelRange(imu.ACCEL_RANGE_2G); // the most sensitive mode
 
 	print("1/6 Place level [8 sec]\n");
 	pause(8);
@@ -112,9 +106,9 @@ void calibrateAccelOnce() {
 	// Compute the average of the accelerometer readings
 	acc = Vector(0, 0, 0);
 	for (int i = 0; i < samples; i++) {
-		imu->waitForData();
+		imu.waitForData();
 		Vector sample;
-		imu->getAccel(sample.x, sample.y, sample.z);
+		imu.getAccel(sample.x, sample.y, sample.z);
 		acc = acc + sample;
 	}
 	acc = acc / samples;
@@ -139,18 +133,18 @@ void printIMUCalibration() {
 }
 
 void printIMUInfo() {
-	imu->status() ? print("status: ERROR %d\n", imu->status()) : print("status: OK\n");
+	imu.status() ? print("status: ERROR %d\n", imu.status()) : print("status: OK\n");
-	print("model: %s\n", imu->getModel());
+	print("model: %s\n", imu.getModel());
-	print("who am I: 0x%02X\n", imu->whoAmI());
+	print("who am I: 0x%02X\n", imu.whoAmI());
 	print("rate: %.0f\n", loopRate);
 	print("interrupt mode: %s\n", imuIntPin != -1 ? "pin" : "timer");
-	print("temperature: %.1f °C\n", imu->getTemp());
+	print("temperature: %.1f °C\n", imu.getTemp());
 	print("gyro: %f %f %f\n", gyro.x, gyro.y, gyro.z);
 	print("acc: %f %f %f\n", acc.x, acc.y, acc.z);
-	imu->waitForData();
+	imu.waitForData();
 	Vector rawGyro, rawAcc;
-	imu->getGyro(rawGyro.x, rawGyro.y, rawGyro.z);
+	imu.getGyro(rawGyro.x, rawGyro.y, rawGyro.z);
-	imu->getAccel(rawAcc.x, rawAcc.y, rawAcc.z);
+	imu.getAccel(rawAcc.x, rawAcc.y, rawAcc.z);
 	print("raw gyro: %f %f %f\n", rawGyro.x, rawGyro.y, rawGyro.z);
 	print("raw acc: %f %f %f\n", rawAcc.x, rawAcc.y, rawAcc.z);
 }

flix/log.ino

@@ -1,77 +1,272 @@
 // Copyright (c) 2023 Oleg Kalachev <okalachev@gmail.com>
 // Repository: https://github.com/okalachev/flix
 
-// In-RAM logging
+// Logging subsystem
 
 #include "vector.h"
 #include "util.h"
 
-#define LOG_RATE 100
+int logMemory = 0; // 0 - RAM, 1 - PSRAM, -1 - disabled
-#define LOG_DURATION 10
+float logUsage = 0.5; // fraction of free memory to use for log
-#define LOG_SIZE LOG_DURATION * LOG_RATE
 
-Vector attitudeEuler;
+struct LogValue {
-Vector attitudeTargetEuler;
-
-struct LogEntry {
 	const char *name;
-	float *value;
+	Value value;
+	float lastValue = NAN;
+	bool logged = true; // if false, use only for triggering log update
+	LogValue() : name(nullptr), value() {}; // empty value constructor
+	template <typename T>
+	LogValue(const char *name, T value, bool logged = true) : name(name), value(value), logged(logged) {};
 };
 
-LogEntry logEntries[] = {
+struct LogTopic {
-	{"t", &t},
+	LogValue values[10];
-	{"rates.x", &rates.x},
+	int length = 0; // number of logged values
-	{"rates.y", &rates.y},
+	float throttle; // max update rate, Hz
-	{"rates.z", &rates.z},
+	float lastUpdate = -INFINITY;
-	{"ratesTarget.x", &ratesTarget.x},
+
-	{"ratesTarget.y", &ratesTarget.y},
+	LogTopic(float throttle, LogValue v0, LogValue v1 = {}, LogValue v2 = {}, LogValue v3 = {}, LogValue v4 = {}, LogValue v5 = {}, LogValue v6 = {}, LogValue v7 = {}, LogValue v8 = {}, LogValue v9 = {}) :
-	{"ratesTarget.z", &ratesTarget.z},
+		throttle(throttle), values{v0, v1, v2, v3, v4, v5, v6, v7, v8, v9} {
-	{"attitude.x", &attitudeEuler.x},
+			// Count logged values
-	{"attitude.y", &attitudeEuler.y},
+			for (auto& v : values) {
-	{"attitude.z", &attitudeEuler.z},
+				if (v.name == nullptr) break;
-	{"attitudeTarget.x", &attitudeTargetEuler.x},
+				if (v.logged) length++;
-	{"attitudeTarget.y", &attitudeTargetEuler.y},
+			}
-	{"attitudeTarget.z", &attitudeTargetEuler.z},
+		};
-	{"thrustTarget", &thrustTarget}
+
+	LogTopic(LogValue v0, LogValue v1 = {}, LogValue v2 = {}, LogValue v3 = {}, LogValue v4 = {}, LogValue v5 = {}, LogValue v6 = {}, LogValue v7 = {}, LogValue v8 = {}, LogValue v9 = {}) :
+		LogTopic(INFINITY, v0, v1, v2, v3, v4, v5, v6, v7, v8, v9) {};
 };
 
-const int logColumns = sizeof(logEntries) / sizeof(logEntries[0]);
+LogTopic logTopics[] = {
-float logBuffer[LOG_SIZE][logColumns];
+	// time
+	LogTopic({"t", &t}), // must be the first topic
+	LogTopic(1, {"loopRate", &loopRate}),
 
-void prepareLogData() {
+	// imu
-	attitudeEuler = attitude.toEuler();
+	LogTopic(
-	attitudeTargetEuler = attitudeTarget.toEuler();
+		{"gyro.x", &gyro.x},
-}
+		{"gyro.y", &gyro.y},
+		{"gyro.z", &gyro.z}),
 
-void logData() {
+	LogTopic(50,
-	if (!armed) return;
+		{"acc.x", &acc.x},
-	static int logPointer = 0;
+		{"acc.y", &acc.y},
-	static Rate period(LOG_RATE);
+		{"acc.z", &acc.z}),
-	if (!period) return;
 
-	prepareLogData();
+	LogTopic(10,
+		{"gyroBias.x", &gyroBias.x},
+		{"gyroBias.y", &gyroBias.y},
+		{"gyroBias.z", &gyroBias.z}),
 
-	for (int i = 0; i < logColumns; i++) {
+	// estimation
-		logBuffer[logPointer][i] = *logEntries[i].value;
+	LogTopic(50,
-	}
+		{"rates.x", &rates.x},
+		{"rates.y", &rates.y},
+		{"rates.z", &rates.z},
+		{"attitude.roll", []() { return attitude.getRoll(); }},
+		{"attitude.pitch", []() { return attitude.getPitch(); }},
+		{"attitude.yaw", []() { return attitude.getYaw(); }}),
 
-	logPointer++;
+	// rc
-	if (logPointer >= LOG_SIZE) {
+	LogTopic(10,
-		logPointer = 0;
+		{"controlTime", &controlTime, false}, // trigger value
+		{"controlRoll", &controlRoll},
+		{"controlPitch", &controlPitch},
+		{"controlYaw", &controlYaw},
+		{"controlThrottle", &controlThrottle}),
+
+	// control
+	LogTopic({"armed", &armed}),
+	LogTopic({"mode", &mode}),
+
+	LogTopic(10,
+		{"ratesTarget.x", &ratesTarget.x},
+		{"ratesTarget.y", &ratesTarget.y},
+		{"ratesTarget.z", &ratesTarget.z},
+		{"attitudeTarget.roll", []() { return attitudeTarget.getRoll(); }},
+		{"attitudeTarget.pitch", []() { return attitudeTarget.getPitch(); }},
+		{"attitudeTarget.yaw", []() { return attitudeTarget.getYaw(); }},
+		{"thrustTarget", &thrustTarget}),
+
+	// motors
+	LogTopic(
+		{"motors[0]", &motors[0]},
+		{"motors[1]", &motors[1]},
+		{"motors[2]", &motors[2]},
+		{"motors[3]", &motors[3]}),
+
+	// misc
+	LogTopic(5,
+		{"voltage", &voltage},
+		{"temp", &temperatureRead},
+		{"imuTemp", []() { return imu.getTemp(); }}),
+};
+
+void *logBuffer; // buffer for log data
+size_t logCapacity;
+size_t logCursor = 0;
+size_t logLength = 0;
+LogValue *logExposed = nullptr; // log values exposed to telemetry
+
+void setupLog() {
+	print("Setup log\n");
+
+	free(logBuffer); // when reconfiguring
+	logBuffer = nullptr;
+	logCursor = 0;
+	logLength = 0;
+
+	if (logMemory == 0) {
+		logCapacity = ESP.getFreeHeap() * logUsage;
+		logBuffer = (uint8_t *)calloc(logCapacity, 1);
+	} else if (logMemory == 1) {
+		logCapacity = ESP.getFreePsram() * logUsage;
+		logBuffer = (uint8_t *)heap_caps_calloc(logCapacity, 1, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
 	}
 }
 
-void printLogHeader() {
+void loopLog() {
-	for (int i = 0; i < logColumns; i++) {
+	if (logBuffer == nullptr || !armed) return;
-		print("%s%s", logEntries[i].name, i < logColumns - 1 ? "," : "\n");
-	}
-}
 
-void printLogData() {
+	if (!logLength) resetLog(); // reset state on first log write
-	for (int i = 0; i < LOG_SIZE; i++) {
+
-		if (logBuffer[i][0] == 0) continue; // skip empty records
+	static Rate sync(2);
-		for (int j = 0; j < logColumns; j++) {
+	if (sync) {
-			print("%g%s", logBuffer[i][j], j < logColumns - 1 ? "," : "\n");
+		const uint8_t marker[] = {0x1A, 0x91, 0x4F, 0xF6, 0x7F};
+		writeLog(&marker, sizeof(marker)); // write sync marker
+	}
+
+	for (uint8_t i = 0; i < sizeof(logTopics) / sizeof(logTopics[0]); i++) {
+		LogTopic& topic = logTopics[i];
+		if (t - topic.lastUpdate < 1 / topic.throttle) continue; // throttle topic
+		if (!isTopicUpdated(i)) continue; // skip if topic was't updated
+
+		topic.lastUpdate = t;
+		writeLog(&i, sizeof(i)); // write topic index
+
+		for (auto& value : topic.values) {
+			if (value.name == nullptr) break;
+			if (!value.logged) continue;
+			value.lastValue = value.value.get();
+			writeLog(&value.lastValue, sizeof(float)); // write value
 		}
 	}
 }
+
+void resetLog() {
+	for (auto& topic : logTopics) {
+		topic.lastUpdate = -INFINITY;
+		for (auto& value : topic.values) {
+			value.lastValue = NAN;
+		}
+	}
+	logCursor = 0;
+	logLength = 0;
+}
+
+void writeLog(const void *data, size_t size) {
+	size_t first = min(size, logCapacity - logCursor);
+	size_t second = size - first;
+	memcpy(logBuffer + logCursor, data, first);
+	logCursor = (logCursor + first) % logCapacity;
+	if (second > 0) {
+		memcpy(logBuffer + logCursor, data + first, second);
+		logCursor = (logCursor + second) % logCapacity;
+	}
+	logLength = min(logLength + size, logCapacity);
+}
+
+void readLog(void *data, size_t position, size_t size) {
+	if (logLength == logCapacity) {
+		position = (logCursor + position) % logCapacity;
+	}
+	size_t first = min(size, logCapacity - position);
+	size_t second = size - first;
+	memcpy(data, logBuffer + position, first);
+	if (second > 0) {
+		memcpy(data + first, logBuffer, second);
+	}
+}
+
+bool isTopicUpdated(const uint8_t topic) {
+	LogTopic& logTopic = logTopics[topic];
+	bool updated = false;
+
+	for (auto& value : logTopic.values) {
+		if (value.name == nullptr) break;
+		float v = value.value.get();
+		if (!floatEquals(value.lastValue, v)) {
+			value.lastValue = v;
+			updated = true;
+		}
+	}
+	return updated;
+}
+
+void printLogInfo() {
+	if (logMemory == -1) return print("Log: disabled\n");
+
+	print("Memory: %s\n", logMemory == 0 ? "RAM" : "PSRAM");
+	print("Usage: %.f%%\n", logUsage * 100);
+	print("Capacity: %u bytes\n", (unsigned)logCapacity);
+	print("Used: %u bytes\n", (unsigned)logLength);
+	print("Estimated duration: %d seconds\n", estimateLogDuration());
+}
+
+int estimateLogDuration() {
+	float bandwidth = 0;
+	for (LogTopic& topic : logTopics) {
+		float rate = isinf(topic.throttle) ? loopRate : topic.throttle;
+		bandwidth += rate * topic.length * sizeof(float);
+	}
+	return logCapacity / bandwidth;
+}
+
+void printLogHeader() {
+	int i = 0;
+	for (auto& topic : logTopics) {
+		print("Topic #%d (%g Hz):\n", i++, topic.throttle);
+		for (auto& value : topic.values) {
+			if (value.name == nullptr) break;
+			print("  %s%s\n", value.name, value.logged ?"" : " (not logged)");
+		}
+	}
+}
+
+void printLogValues(const char *filter) {
+	for (LogTopic& topic : logTopics) {
+		for (LogValue& value : topic.values) {
+			if (value.name == nullptr) break;
+			if (strncasecmp(value.name, filter, strlen(filter))) continue;
+			print("%s = %g\n", value.name, value.value.get());
+		}
+	}
+}
+
+void configLogThrottle(const char *name, float throttle) {
+	for (LogTopic& topic : logTopics) {
+		for (LogValue& value : topic.values) {
+			if (value.name == nullptr) break;
+			if (strcasecmp(value.name, name) != 0) continue;
+			topic.throttle = throttle;
+			print("Log throttle for %s set to %.1f Hz\n", name, throttle);
+			return;
+		}
+	}
+	print("Log value not found: %s\n", name);
+}
+
+void exposeLogValue(const char *name) {
+	for (int i = 0; i < sizeof(logTopics) / sizeof(logTopics[0]); i++) {
+		LogTopic& topic = logTopics[i];
+		for (LogValue& value : topic.values) {
+			if (value.name == nullptr) break;
+			if (strcasecmp(value.name, name) != 0) continue;
+			logExposed = &value;
+			print("Log value %s exposed\n", name);
+			return;
+		}
+	}
+	print("Log value not found: %s\n", name);
+}

flix/mavlink.ino

@@ -16,8 +16,9 @@ Rate telemetryAttitude(20);
 Rate telemetryRC(10);
 Rate telemetryMotors(10);
 Rate telemetryIMU(15);
+Rate telemetryTopic(10);
 
-float mavlinkTime = NAN; // time of last received message
+bool mavlinkConnected = false;
 String mavlinkPrintBuffer;
 
 void processMavlink() {
@@ -40,7 +41,7 @@ void sendMavlink() {
 		sendMessage(&msg);
 	}
 
-	if (!valid(mavlinkTime)) return; // send only heartbeat until connected
+	if (!mavlinkConnected) return; // send only heartbeat until connected
 
 	if (telemetrySlow) {
 		mavlink_msg_extended_sys_state_pack(mavlinkSysId, MAV_COMP_ID_AUTOPILOT1, &msg,
@@ -84,6 +85,12 @@ void sendMavlink() {
 			0, 0, 0, 0);
 		sendMessage(&msg);
 	}
+
+	if (telemetryTopic && logExposed != nullptr) {
+		mavlink_msg_named_value_float_pack(mavlinkSysId, MAV_COMP_ID_AUTOPILOT1, &msg,
+			time, logExposed->name, logExposed->value.get());
+		sendMessage(&msg);
+	}
 }
 
 void sendMessage(const void *msg) {
@@ -92,6 +99,26 @@ void sendMessage(const void *msg) {
 	sendWiFi(buf, len);
 }
 
+static uint8_t mavlinkBatch[ESP_NOW_MAX_DATA_LEN_V2];
+static int mavlinkBatchSize = 0;
+
+void batchMessage(const void *msg) {
+	uint8_t buf[MAVLINK_MAX_PACKET_LEN];
+	int len = mavlink_msg_to_send_buffer(buf, (mavlink_message_t *)msg);
+
+	if (mavlinkBatchSize + len > sizeof(mavlinkBatch)) {
+		sendWiFi(mavlinkBatch, mavlinkBatchSize);
+		mavlinkBatchSize = 0;
+	}
+	memcpy(mavlinkBatch + mavlinkBatchSize, buf, len);
+	mavlinkBatchSize += len;
+}
+
+void flushBatchMessages() {
+	sendWiFi(mavlinkBatch, mavlinkBatchSize);
+	mavlinkBatchSize = 0;
+}
+
 void receiveMavlink() {
 	uint8_t buf[MAVLINK_MAX_PACKET_LEN];
 	int len = receiveWiFi(buf, MAVLINK_MAX_PACKET_LEN);
@@ -101,7 +128,7 @@ void receiveMavlink() {
 	mavlink_status_t status;
 	for (int i = 0; i < len; i++) {
 		if (mavlink_parse_char(MAVLINK_COMM_0, buf[i], &msg, &status)) {
-			mavlinkTime = t;
+			mavlinkConnected = true;
 			handleMavlink(&msg);
 		}
 	}
@@ -196,18 +223,24 @@ void handleMavlink(const void *_msg) {
 		mavlink_msg_set_attitude_target_decode(&msg, &m);
 		if (m.target_system && m.target_system != mavlinkSysId) return;
 
-		// copy attitude, rates and thrust targets
+		if (!(m.type_mask & ATTITUDE_TARGET_TYPEMASK_ATTITUDE_IGNORE)) {
-		ratesTarget.x = m.body_roll_rate;
+			// Attitude control
-		ratesTarget.y = -m.body_pitch_rate; // convert to flu
+			attitudeTarget.w = m.q[0];
-		ratesTarget.z = -m.body_yaw_rate;
+			attitudeTarget.x = m.q[1];
-		attitudeTarget.w = m.q[0];
+			attitudeTarget.y = -m.q[2];
-		attitudeTarget.x = m.q[1];
+			attitudeTarget.z = -m.q[3];
-		attitudeTarget.y = -m.q[2];
+			ratesExtra.x = m.type_mask & ATTITUDE_TARGET_TYPEMASK_BODY_ROLL_RATE_IGNORE ? 0 : m.body_roll_rate;
-		attitudeTarget.z = -m.q[3];
+			ratesExtra.y = m.type_mask & ATTITUDE_TARGET_TYPEMASK_BODY_PITCH_RATE_IGNORE ? 0 : -m.body_pitch_rate; // convert to flu
-		thrustTarget = m.thrust;
+			ratesExtra.z = m.type_mask & ATTITUDE_TARGET_TYPEMASK_BODY_YAW_RATE_IGNORE ? 0 : -m.body_yaw_rate;
-		ratesExtra = Vector(0, 0, 0);
+		} else {
+			// Rates control
+			attitudeTarget.invalidate();
+			ratesTarget.x = m.type_mask & ATTITUDE_TARGET_TYPEMASK_BODY_ROLL_RATE_IGNORE ? ratesTarget.x : m.body_roll_rate;
+			ratesTarget.y = m.type_mask & ATTITUDE_TARGET_TYPEMASK_BODY_PITCH_RATE_IGNORE ? ratesTarget.y : -m.body_pitch_rate;
+			ratesTarget.z = m.type_mask & ATTITUDE_TARGET_TYPEMASK_BODY_YAW_RATE_IGNORE ? ratesTarget.z : -m.body_yaw_rate;
+		}
 
-		if (m.type_mask & ATTITUDE_TARGET_TYPEMASK_ATTITUDE_IGNORE) attitudeTarget.invalidate();
+		thrustTarget = valid(m.thrust) ? m.thrust : thrustTarget;
 		armed = m.thrust > 0;
 	}
 
@@ -225,18 +258,29 @@ void handleMavlink(const void *_msg) {
 		armed = motors[0] > 0 || motors[1] > 0 || motors[2] > 0 || motors[3] > 0;
 	}
 
+	if (msg.msgid == MAVLINK_MSG_ID_LOG_REQUEST_LIST) {
+		const uint32_t qgcEpoch = 1262304000; // qgc accepts only timestamps after 2010-01-01
+		mavlink_message_t response;
+		mavlink_msg_log_entry_pack(mavlinkSysId, MAV_COMP_ID_AUTOPILOT1, &response,
+			0, 1, 0, qgcEpoch + t * 60, logLength); // put fake unique date to make qgc happy with saving logs
+		sendMessage(&response);
+	}
+
 	if (msg.msgid == MAVLINK_MSG_ID_LOG_REQUEST_DATA) {
 		mavlink_log_request_data_t m;
 		mavlink_msg_log_request_data_decode(&msg, &m);
 		if (m.target_system && m.target_system != mavlinkSysId) return;
 
-		// Send all log records
+		for (int i = 0; i < m.count; i += MAVLINK_MSG_LOG_DATA_FIELD_DATA_LEN) {
-		for (int i = 0; i < sizeof(logBuffer) / sizeof(logBuffer[0]); i++) {
+			int chunkSize = min(MAVLINK_MSG_LOG_DATA_FIELD_DATA_LEN, (int)(m.count - i));
-			mavlink_message_t msg;
+			mavlink_message_t response;
-			mavlink_msg_log_data_pack(mavlinkSysId, MAV_COMP_ID_AUTOPILOT1, &msg, 0, i,
+			uint8_t data[MAVLINK_MSG_LOG_DATA_FIELD_DATA_LEN];
-				sizeof(logBuffer[0]), (uint8_t *)logBuffer[i]);
+			readLog(data, m.ofs + i, chunkSize);
-			sendMessage(&msg);
+			mavlink_msg_log_data_pack(mavlinkSysId, MAV_COMP_ID_AUTOPILOT1, &response,
+				m.id, m.ofs + i, chunkSize, data);
+			batchMessage(&response);
 		}
+		flushBatchMessages();
 	}
 
 	// Handle commands

flix/motors.ino

@@ -51,9 +51,9 @@ bool motorsActive() {
 	return motors[0] != 0 || motors[1] != 0 || motors[2] != 0 || motors[3] != 0;
 }
 
-void testMotor(int n, float thrust) {
+void testMotor(int n) {
 	print("Testing motor %d\n", n);
-	motors[n] = thrust;
+	motors[n] = 0.2;
 	delay(50); // ESP32 may need to wait until the end of the current cycle to change duty https://github.com/espressif/arduino-esp32/issues/5306
 	sendMotors();
 	pause(3);

flix/parameters.ino

@@ -9,20 +9,18 @@
 extern int channelZero[16], channelMax[16];
 extern int rollChannel, pitchChannel, throttleChannel, yawChannel, armedChannel, modeChannel;
 extern int rcRxPin, voltagePin;
-extern int wifiMode, wifiLongRange, wifiBroadcast, udpLocalPort, udpRemotePort, espnowChannel;
+extern int wifiMode, wifiLongRange, udpLocalPort, udpRemotePort, espnowChannel;
-extern float rcLossTimeout, descendTime, disarmTilt;
+extern float rcLossTimeout, descendTime;
 extern float voltageScale;
 extern LowPassFilter<float> voltageFilter;
 
-#include "config.h"
-
 Preferences storage;
 
 struct Parameter {
 	const char *name; // max length is 15
 	bool integer;
 	union { float *f; int *i; }; // pointer to the variable
-	float initial; // default value
+	float inital; // default value
 	float cache; // what's stored in flash
 	void (*callback)(); // called after parameter change
 	Parameter(const char *name, float *variable, void (*callback)() = nullptr) : name(name), integer(false), f(variable), callback(callback) {};
@@ -46,7 +44,6 @@ Parameter parameters[] = {
 	{"CTL_Y_RATE_P", &yawRatePID.p},
 	{"CTL_Y_RATE_I", &yawRatePID.i},
 	{"CTL_Y_RATE_D", &yawRatePID.d},
-	{"CTL_Y_RATE_WU", &yawRatePID.windup},
 	{"CTL_Y_RATE_D_A", &yawRatePID.lpf.alpha},
 	{"CTL_R_P", &rollPID.p},
 	{"CTL_R_I", &rollPID.i},
@@ -69,8 +66,6 @@ Parameter parameters[] = {
 	{"IMU_PIN_MISO", &imuMisoPin},
 	{"IMU_PIN_MOSI", &imuMosiPin},
 	{"IMU_PIN_CS", &imuCsPin},
-	{"IMU_PIN_SDA", &imuSdaPin},
-	{"IMU_PIN_SCL", &imuSclPin},
 	{"IMU_PIN_INT", &imuIntPin},
 	{"IMU_ROT_ROLL", &imuRotation.x},
 	{"IMU_ROT_PITCH", &imuRotation.y},
@@ -86,6 +81,8 @@ Parameter parameters[] = {
 	{"EST_ACC_WEIGHT", &accWeight},
 	{"EST_LVL_WEIGHT", &levelWeight},
 	{"EST_RATES_LPF_A", &ratesFilter.alpha},
+	{"EST_RATES_NF_F", &ratesNotch.frequency, setupEstimate},
+	{"EST_RATES_NF_BW", &ratesNotch.bandwidth, setupEstimate},
 	// motors
 	{"MOT_PIN_FL", &motorPins[MOTOR_FRONT_LEFT], setupMotors},
 	{"MOT_PIN_FR", &motorPins[MOTOR_FRONT_RIGHT], setupMotors},
@@ -124,7 +121,6 @@ Parameter parameters[] = {
 	{"WIFI_PORT_LOC", &udpLocalPort},
 	{"WIFI_PORT_REM", &udpRemotePort},
 	{"WIFI_LONG_RANGE", &wifiLongRange},
-	{"WIFI_BROADCAST", &wifiBroadcast},
 	// espnow
 	{"ESPNOW_CHANNEL", &espnowChannel},
 	// mavlink
@@ -134,6 +130,22 @@ Parameter parameters[] = {
 	{"MAV_RATE_RC", &telemetryRC.rate},
 	{"MAV_RATE_MOT", &telemetryMotors.rate},
 	{"MAV_RATE_IMU", &telemetryIMU.rate},
+	{"MAV_RATE_TOPIC", &telemetryTopic.rate},
+	// log
+	{"LOG_MEMORY", &logMemory, setupLog},
+	{"LOG_USAGE", &logUsage, setupLog},
+	{"LOG_RATE_000", &logTopics[0].throttle},
+	{"LOG_RATE_001", &logTopics[1].throttle},
+	{"LOG_RATE_002", &logTopics[2].throttle},
+	{"LOG_RATE_003", &logTopics[3].throttle},
+	{"LOG_RATE_004", &logTopics[4].throttle},
+	{"LOG_RATE_005", &logTopics[5].throttle},
+	{"LOG_RATE_006", &logTopics[6].throttle},
+	{"LOG_RATE_007", &logTopics[7].throttle},
+	{"LOG_RATE_008", &logTopics[8].throttle},
+	{"LOG_RATE_009", &logTopics[9].throttle},
+	{"LOG_RATE_010", &logTopics[10].throttle},
+	{"LOG_RATE_011", &logTopics[11].throttle},
 	// power
 	{"PWR_VOLT_PIN", &voltagePin, setupPower},
 	{"PWR_VOLT_SCALE", &voltageScale},
@@ -141,16 +153,14 @@ Parameter parameters[] = {
 	// safety
 	{"SF_RC_LOSS_TIME", &rcLossTimeout},
 	{"SF_DESCEND_TIME", &descendTime},
-	{"SF_DISARM_TILT", &disarmTilt},
 };
 
 void setupParameters() {
 	print("Setup parameters\n");
-	setDefaults();
 	storage.begin("flix");
 	// Read parameters from storage
 	for (auto &parameter : parameters) {
-		parameter.initial = parameter.getValue();
+		parameter.inital = parameter.getValue();
 		if (storage.isKey(parameter.name)) {
 			parameter.setValue(storage.getFloat(parameter.name));
 		}
@@ -211,10 +221,10 @@ void printParameters(const char *filter) {
 	for (auto &parameter : parameters) {
 		if (strncasecmp(parameter.name, filter, strlen(filter))) continue;
 
-		if (floatEquals(parameter.getValue(), parameter.initial)) { // parameter changed
+		if (floatEquals(parameter.getValue(), parameter.inital)) { // parameter changed
 			print("%-15s  %-13g\n", parameter.name, parameter.getValue());
 		} else {
-			print("%-15s  %-13g  [%g]\n", parameter.name, parameter.getValue(), parameter.initial);
+			print("%-15s  %-13g  [%g]\n", parameter.name, parameter.getValue(), parameter.inital);
 		}
 	}
 }

flix/pid.h

@@ -18,7 +18,7 @@ public:
 
 	LowPassFilter<float> lpf; // low pass filter for derivative term
 
-	PID(float p, float i = 0, float d = 0, float windup = INFINITY, float dAlpha = 1, float dtMax = 0.1) :
+	PID(float p, float i, float d, float windup = 0, float dAlpha = 1, float dtMax = 0.1) :
 		p(p), i(i), d(d), windup(windup), lpf(dAlpha), dtMax(dtMax) {}
 
 	float update(float error) {

flix/safety.ino

@@ -8,12 +8,10 @@ extern float controlRoll, controlPitch, controlThrottle, controlYaw;
 
 float rcLossTimeout = 1;
 float descendTime = 10;
-float disarmTilt = radians(120);
 
 void failsafe() {
 	rcLossFailsafe();
 	autoFailsafe();
-	tiltFailsafe();
 }
 
 // RC loss failsafe
@@ -38,7 +36,7 @@ void descend() {
 // Allow pilot to interrupt automatic flight
 void autoFailsafe() {
 	static float roll, pitch, yaw, throttle;
-	if (abs(roll - controlRoll) > 0.05 || abs(pitch - controlPitch) > 0.05 || abs(yaw - controlYaw) > 0.05 || abs(throttle - controlThrottle) > 0.05) {
+	if (roll != controlRoll || pitch != controlPitch || yaw != controlYaw || abs(throttle - controlThrottle) > 0.05) {
 		// controls changed and mode switch is not configured
 		if (mode == AUTO && invalid(controlMode)) mode = STAB; // regain control by the pilot
 	}
@@ -47,15 +45,3 @@ void autoFailsafe() {
 	yaw = controlYaw;
 	throttle = controlThrottle;
 }
-
-// Disarm if tilted too much
-void tiltFailsafe() {
-	if (!armed) return;
-	if (mode != STAB) return;
-
-	Vector up = Quaternion::rotateVector(Vector(0, 0, 1), attitude);
-	float tilt = acos(up.z);
-	if (disarmTilt && tilt > disarmTilt) {
-		armed = false;
-	}
-}

flix/util.h

@@ -64,11 +64,54 @@ public:
 	}
 };
 
+// Simple variant type for logging and parameters
+struct Value {
+	enum { EMPTY, FLOAT, INT, BOOL, FLOAT_FN, INT_FN, BOOL_FN } type;
+	union {
+		void *pointer;
+		float *_float;
+		int *_int;
+		bool *_bool;
+		float (*floatFn)();
+		int (*intFn)();
+		bool (*boolFn)();
+	};
+
+	Value() : type(EMPTY), pointer(nullptr) {};
+	Value(float *pt) : type(FLOAT), _float(pt) {};
+	Value(int *pt) : type(INT), _int(pt) {};
+	Value(bool *pt) : type(BOOL), _bool(pt) {};
+	Value(float (*fn)()) : type(FLOAT_FN), floatFn(fn) {};
+	Value(int (*fn)()) : type(INT_FN), intFn(fn) {};
+	Value(bool (*fn)()) : type(BOOL_FN), boolFn(fn) {};
+
+	float get() const {
+		switch (type) {
+			case FLOAT: return *_float;
+			case INT: return *_int;
+			case BOOL: return *_bool ? 1 : 0;
+			case FLOAT_FN: return floatFn();
+			case INT_FN: return intFn();
+			case BOOL_FN: return boolFn() ? 1 : 0;
+			default: return NAN;
+		}
+	};
+
+	void set(float value) const {
+		switch (type) {
+			case FLOAT: *_float = value; break;
+			case INT: *_int = value; break;
+			case BOOL: *_bool = (value != 0); break;
+			default: break;
+		}
+	};
+};
+
 // Rate limiter
 class Rate {
 public:
 	float rate;
-	float last = -INFINITY;
+	float last = 0;
 	Rate(float rate) : rate(rate) {}
 
 	operator bool() {

flix/wifi.ino

@@ -17,7 +17,6 @@ const int W_DISABLED = 0, W_AP = 1, W_STA = 2, W_ESPNOW = 3;
 int wifiMode = W_AP;
 
 int wifiLongRange = 0;
-int wifiBroadcast = 0; // 0 - broadcast until connected, 1 - always broadcast
 int udpLocalPort = 14550;
 int udpRemotePort = 14550;
 IPAddress udpRemoteIP = "255.255.255.255";
@@ -59,14 +58,13 @@ void sendWiFi(const uint8_t *buf, int len) {
 		espnow.write(buf, len);
 
 		static Rate discovery(2);
-		if (espnow.isEncrypted() && discovery) espnowBroadcast.write((const uint8_t *)"flix", 4); // broadcast message to help finding this device
+		if (discovery) espnowBroadcast.write((const uint8_t *)"flix", 4); // broadcast message to help finding this device
 		return;
 	}
 
 	if (WiFi.softAPgetStationNum() == 0 && !WiFi.isConnected()) return;
 
-	bool broadcast = wifiBroadcast || !(t - mavlinkTime < 5); // broadcast if lost connection
+	udp.beginPacket(udpRemoteIP, udpRemotePort);
-	udp.beginPacket(broadcast ? IPAddress(255, 255, 255, 255) : udpRemoteIP, udpRemotePort);
 	udp.write(buf, len);
 	udp.endPacket();
 }
@@ -115,7 +113,7 @@ void printWiFiInfo() {
 	} else {
 		print("Mode: Disabled\n");
 	}
-	print("MAVLink connected: %d\n", valid(mavlinkTime));
+	print("MAVLink connected: %d\n", mavlinkConnected);
 }
 
 void configWiFi(int mode, const char *first, const char *second) {

gazebo/Arduino.h

@@ -20,6 +20,10 @@
 #define radians(deg) ((deg)*DEG_TO_RAD)
 #define degrees(rad) ((rad)*RAD_TO_DEG)
 
+#define MALLOC_CAP_SPIRAM (1<<10)
+#define MALLOC_CAP_8BIT (1<<2)
+#define ESP_NOW_MAX_DATA_LEN_V2 1470
+
 #define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
 template<typename T> T max(T a, T b) { return a > b ? a : b; }
 template<typename T> T min(T a, T b) { return a < b ? a : b; }
@@ -156,6 +160,8 @@ HardwareSerial Serial, Serial1, Serial2;
 class EspClass {
 public:
 	void restart() { Serial.println("Ignore reboot in simulation"); }
+	uint32_t getFreeHeap() { return 300 * 1024; } // assume 300 KB free heap
+	uint32_t getFreePsram() { return 8 * 1024 * 1024; } // assume 8 MB free PSRAM
 } ESP;
 
 unsigned long __delayTime = 0;
@@ -165,11 +171,16 @@ void delay(uint32_t ms) {
 	__delayTime += ms * 1000;
 }
 
+void *heap_caps_calloc(size_t n, size_t size, uint32_t caps) {
+	return calloc(n, size);
+}
+
 bool ledcAttach(uint8_t pin, uint32_t freq, uint8_t resolution) { return true; }
 bool ledcWrite(uint8_t pin, uint32_t duty) { return true; }
 uint32_t ledcChangeFrequency(uint8_t pin, uint32_t freq, uint8_t resolution) { return freq; }
 int8_t digitalPinToAnalogChannel(uint8_t pin) { return -1; }
 uint32_t analogReadMilliVolts(uint8_t pin) { return 0; }
+float temperatureRead() { return 0; }
 
 unsigned long __micros;
 unsigned long __resetTime = 0;

gazebo/flix.h

@@ -24,6 +24,7 @@ LowPassFilter<Vector> gyroBiasFilter(0);
 int imuModel = 1, imuBus = 0;
 int imuSckPin = 0, imuMisoPin = 0, imuMosiPin = 0, imuCsPin = -1, imuIntPin = -1;
 int imuSdaPin = 0, imuSclPin = 0;
+int rgbPin = -1, rgbNum = 1;
 
 // declarations
 void step();
@@ -41,7 +42,7 @@ const char* getModeName();
 void sendMotors();
 int getDutyCycle(float value);
 bool motorsActive();
-void testMotor(int, float);
+void testMotor(int n);
 void print(const char* format, ...);
 void pause(float duration);
 void doCommand(String str, bool echo);
@@ -51,8 +52,17 @@ void normalizeRC();
 void calibrateRC();
 void calibrateRCChannel(int*, uint16_t[16], uint16_t[16], const char*);
 void printRCCalibration();
+void loopLog();
+void resetLog();
+void writeLog(const void *data, size_t size);
+void readLog(void *data, size_t position, size_t size);
+bool isTopicUpdated(const uint8_t topic);
+void printLogInfo();
+int estimateLogDuration();
 void printLogHeader();
-void printLogData();
+void printLogValues(const char *filter);
+void configLogThrottle(const char *name, float throttle);
+void exposeLogValue(const char *name);
 void processMavlink();
 void sendMavlink();
 void sendMessage(const void *msg);
@@ -66,7 +76,6 @@ void failsafe();
 void rcLossFailsafe();
 void descend();
 void autoFailsafe();
-void tiltFailsafe();
 int parametersCount();
 const char *getParameterName(int index);
 float getParameter(int index);
@@ -83,3 +92,8 @@ void printIMUInfo() {};
 void printWiFiInfo() {};
 void configWiFi(bool, const char*, const char*) { print("Skip WiFi config\n"); };
 void setWiFiMode(const String& mode) { print("Skip WiFi mode set\n"); };
+
+class IMU {
+public:
+	float getTemp() { return 0; }
+} imu;

gazebo/simulator.cpp

@@ -55,6 +55,7 @@ public:
 		initNode();
 		Serial.begin(0);
 		setupParameters();
+		setupLog();
 		rcRxPin = 1; // set rc pin to enable rc reading
 		gzmsg << "Flix plugin loaded" << endl;
 	}
@@ -88,7 +89,7 @@ public:
 
 		applyMotorForces();
 		publishTopics();
-		logData();
+		loopLog();
 		syncParameters();
 	}
 

gazebo/wifi.h

@@ -14,7 +14,6 @@
 // Mocks
 int wifiMode = 1;
 int wifiLongRange = 0;
-int wifiBroadcast = 0;
 int espnowChannel = 6;
 const int W_DISABLED = 0, W_AP = 1, W_STA = 2, W_ESPNOW = 3;
 

tools/csv_to_mcap.py

@@ -9,6 +9,7 @@ Usage:
 import csv
 import json
 import docopt
+import math
 from mcap.writer import Writer
 
 args = docopt.docopt(__doc__)
@@ -39,7 +40,15 @@ channel_id = writer.register_channel(
 )
 
 for row in csv_reader:
-    data = {key: float(value) for key, value in zip(header, row)}
+    if row[0] == '': continue
+    data = {}
+    for key, value in zip(header, row):
+        if value == '' or math.isnan(float(value)):
+            data[key] = None
+        else:
+            data[key] = float(value)
+
+    data = {key: float(value) if value != '' else None for key, value in zip(header, row)}
     timestamp = round(float(row[0]) * 1e9)
     writer.add_message(channel_id=channel_id, log_time=timestamp, data=json.dumps(data).encode(), publish_time=timestamp,)
 

tools/log_to_csv.py

@@ -0,0 +1,76 @@
+#!/usr/bin/env python3
+
+"""Convert flight from Flix format to CSV
+
+Usage:
+    log_to_csv.py <input_file>
+"""
+
+import os
+from pyflix import Flix
+import docopt
+import struct
+import csv
+
+DIR = os.path.dirname(os.path.realpath(__file__))
+HEADER_FILE = os.path.join(DIR, 'log/log_header.txt')
+
+# Read log header
+try:
+    # read from file
+    header = open(HEADER_FILE, 'r').read()
+except FileNotFoundError:
+    flix = Flix()
+    header = flix.cli('log header')  # receive the log schema
+    open(HEADER_FILE, 'w').write(header)  # save to file
+
+# Parse log header
+topics = []
+for line in header.splitlines():
+    if not line.startswith('  '):
+        topics.append([])
+    elif 'not logged' not in line:
+        topics[-1].append(line.strip())
+
+# Read log file
+args = docopt.docopt(__doc__)
+input_file = args['<input_file>']
+outfile_file = input_file + '.csv'
+data = open(input_file, 'rb').read()
+
+# Search for sync marker
+SYNC_MARKER = bytes.fromhex('1A 91 4F F6 7F')
+sync_offset = data.find(SYNC_MARKER)
+if sync_offset == -1:
+    raise ValueError('Sync marker not found in log file')
+data = data[sync_offset + len(SYNC_MARKER):]
+data = data.replace(SYNC_MARKER, b'')  # remove all other sync markers
+
+header_row = [f'{value}' for topic in topics for value in topic]
+rows = []
+
+offset = 0
+while offset < len(data):
+    try:
+        topic = struct.unpack_from('B', data, offset)[0]
+        offset += 1
+
+        if topic >= len(topics):
+            raise ValueError(f'Invalid topic {topic} at offset {offset}')
+
+        if topic == 0 or not rows:
+            rows.append({})
+
+        for name in topics[topic]:
+            value = struct.unpack_from('<f', data, offset)[0]
+            offset += 4
+            rows[-1][name] = value
+    except struct.error as e:
+        break
+
+# Write CSV file
+with open(outfile_file, 'w', newline='') as f:
+    writer = csv.DictWriter(f, fieldnames=header_row, extrasaction='ignore')
+    writer.writeheader()
+    rows = filter(lambda row: float(row.get('t', 0)), rows)
+    writer.writerows(rows)

tools/pyflix/flix.py

@@ -243,7 +243,7 @@ class Flix:
             time.sleep(1)
 
     @staticmethod
-    def _mavlink_to_flu(v: Sequence[float]) -> List[float]:
+    def _mavlink_to_flu(v: List[float]) -> List[float]:
         if len(v) == 3:  # vector
             return [v[0], -v[1], -v[2]]
         elif len(v) == 4:  # quaternion
@@ -252,8 +252,8 @@ class Flix:
             raise ValueError(f'List must have 3 (vector) or 4 (quaternion) elements')
 
     @staticmethod
-    def _flu_to_mavlink(v: Sequence[float]) -> List[float]:
+    def _flu_to_mavlink(v: List[float]) -> List[float]:
-        return Flix._mavlink_to_flu(v)  # flu to mavlink is the same as mavlink to flu
+        return Flix._mavlink_to_flu(v)
 
     def _command_send(self, command: int, params: Sequence[float]):
         if len(params) != 7:
@@ -320,13 +320,13 @@ class Flix:
     def set_armed(self, armed: bool):
         self._command_send(mavlink.MAV_CMD_COMPONENT_ARM_DISARM, (1 if armed else 0, 0, 0, 0, 0, 0, 0))
 
-    def set_position(self, position: Sequence[float], yaw: Optional[float] = None, wait: bool = False, tolerance: float = 0.1):
+    def set_position(self, position: List[float], yaw: Optional[float] = None, wait: bool = False, tolerance: float = 0.1):
         raise NotImplementedError('Position control is not implemented yet')
 
-    def set_velocity(self, velocity: Sequence[float], yaw: Optional[float] = None):
+    def set_velocity(self, velocity: List[float], yaw: Optional[float] = None):
         raise NotImplementedError('Velocity control is not implemented yet')
 
-    def set_attitude(self, attitude: Sequence[float], thrust: float):
+    def set_attitude(self, attitude: List[float], thrust: float):
         if len(attitude) == 3:
             attitude = Quaternion([attitude[0], attitude[1], attitude[2]]).q  # type: ignore
         elif len(attitude) != 4:
@@ -339,7 +339,7 @@ class Flix:
                 [attitude[0], attitude[1], attitude[2], attitude[3]],
                 0, 0, 0, thrust)
 
-    def set_rates(self, rates: Sequence[float], thrust: float):
+    def set_rates(self, rates: List[float], thrust: float):
         if len(rates) != 3:
             raise ValueError('Rates must be [roll_rate, pitch_rate, yaw_rate]')
         if not (0 <= thrust <= 1):
@@ -351,7 +351,7 @@ class Flix:
                 [1, 0, 0, 0],
                 rates[0], rates[1], rates[2], thrust)
 
-    def set_motors(self, motors: Sequence[float]):
+    def set_motors(self, motors: List[float]):
         if len(motors) != 4:
             raise ValueError('motors must have 4 values')
         if not all(0 <= m <= 1 for m in motors):