OpenMV for Kendryte K210

Special thanks to DeepVISION, they are enthusiastic and we were enjoyable working with them in this project.

Also thanks to Sipeed, without the MaixPy project, we can't finish this so fast.

Usage

Kendryte-standalone-opemv build steps:

1. download V8.2.0 toolchain from https://kendryte.com/downloads/
2. export PATH=/opt/maix-toolchain/bin/:$PATH (riscv toolchain path for micropython build)
3. mkdir build
4. cd build
5. cmake .. -DPROJ=openmv -DTOOLCHAIN=/opt/maix-toolchain/bin (riscv toolchain path for kendryte sdk build)
6. make

The default example is face detect, you can change src/openmv/src/micropython/ports/k210-standalone/buildin-py/boot.py to implement other openmv functions.