maix3_opencv_python

Docker builder for opencv-python for MAIX-II Dock ( Allwinner V831: Cortex-A7 and 0.2TOPS NPU )

Uses Docker Cross https://github.com/dockcross/dockcross

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This repo uses submodules so clone it

git clone --recurse-submodules -j8 https://github.com/irfan798/maix3_opencv_python.git

Builds

• MaixPy3:0.3.4
• OpenCV-Python:4.5.5

These builds works on MAIX-II Dock with firmware that has Numpy:1.19.2

If you are building for a firmware that has different numpy, please change numpy version accordingly in opencv-cross.yml

Build Docker

docker build -t linux-armv7l-musl-v83x-python ./docker  

This will create an image which you can compile for v83x

Create builder executable

docker run linux-armv7l-musl-v83x-python > ./dockcross-v83x
chmod +x ./dockcross-v83x

Build MaixPy

./dockcross-v83x bash scripts/buildMaixPy3.sh 

Dist package will be in ./repos/MaixPy3/dist folder

Build Opencv-Python

./dockcross-v83x bash scripts/buildOpencv.sh 

Dist package will be in ./repos/opencv-python/dist folder

Building other projects

Check https://github.com/dockcross/dockcross#examples

./dockcross-v83x make

Installing packages on MAIX-II Dock

Connect to Maix-II Dock using ADB

If you connect cable into Maix-II Dock's USB OTG port, you will should be able to use adb commands

Check with adb devices -l

adb push ./repos/opencv-python/dist/opencv_python_headless-4.5.5.62-cp38-cp38-linux_armv7l.whl /root/
adb shell "pip install /root/opencv_python_headless-4.5.5.62-cp38-cp38-linux_armv7l.whl --upgrade" 

Connect to Maix-II Dock serial

Connect a USB-C cable to Maix-II Dock's USB UART port. You shall be able to screen into firmware

 screen /dev/ttyUSB0 115200

TODO:Continue ssh setup

Troubleshooting

ADB

If you cannot see your device on adb list or access it make sure you have added your device to udev rules.

1. Unplug Maix-II Dock
2. In a console run:

sudo dmesg -wH

3. Plug usb to USB OTG port on Maix-II Dock

You should note the new device in console, something like the following should appear:

[ +12.953497] usb 5-1: new high-speed USB device number 4 using xhci_hcd
[  +0.230599] usb 5-1: New USB device found, idVendor=18d1, idProduct=0002, bcdDevice= 4.09
[  +0.000006] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  +0.000002] usb 5-1: Manufacturer: Android
[  +0.000002] usb 5-1: SerialNumber: 20080411

4. Take note of idVendor and

Check your /etc/udev/rules.d/51-android.rules (if it doesn't exists create it) and add the following line with your own idVendor

SUBSYSTEM=="usb", ATTRS{idVendor}=="18d1", MODE="0666"

5. Restart udev service with

sudo systemctl restart udev

6. Restart adb service with

adb kill-server && adb start-server

7. Disconnect and reconnect the device again.
8. Try adb devices again