design communication protocol (proton buffer)

[dephiloper]

• communication between main_unit and car_controls

[Capscreen]

• first build and install of protobuf for python3
• compiled test ".proto" file to python module (metaclass module)
• simple python module to write a message as binary buffer in conjunction with metaclass module of the ".proto"

[Bluemi]

Protocol Version 0.1:

1. The first 2 bits are flags:
   • The first bit is the \<mode>-bit. If "mode"-bit is set \<value> (see 3.) controls the power of the drive motor, if not set \<value> controls the wheel angle.
   • The second bit is the \<direction>-bit. If \<direction>-bit is set the car will move backwards, in case of \<mode> is set. In case of \<mode>-bit is not set a set \<direction>-bit will effect the car to steer left otherwise right.
2. The following 6 bits are used for a debug-level as unsigned int.
   • 0 => no debug-logs will be send to pi
   • 1 => debug-logs will be send to pi
   • we can make up to 64 debug-level (hopefully don't need it ^^)
3. The last 4 byte represent the float variable \<value>, that describes either the wheel angle or the drive-power depending on \<mode>.

[Capscreen]

• implemented protobuf for python on send and receive
• protobuf is working in python on a virtual serial port
• suspended protobuf for potential solutions in the future

[dephiloper]

We created a wiki for all protocols and the main layer structure. The new version of the nucleo - pi communication protocol can be found on the link down below. https://github.com/aradar/autonomous-car/wiki/Pi-Nucleo-Serial-Communication-Protocol