Implementation of the PX4 flow algorithm for ardupilot.
Based on the original PX4 Flow code, it has diverged a lot.
I have kept the license header since it is required.
I have removed all the unused and dead code on current implementation,
modified the code to make it clearer, re-indented it and changed
the way some params are calculated. It has been tested on PC and
on board and showed results that I assumed were OK. No optical flow
Loiter tests have been undertaken since it requires a Sonar which will
be added soon.
Limitations :
Some parts were written in ARM assembly and I rewrote them very naively
to get them to be more easily portable. A simple optimisation would be
to re-introduce assembly code for ARM as a separate asm file with
methods for fixed resolutions that would reduce a lot the amount of
calculation and memory read/writes. Then writing a version in NEON
assembly would even be more optimised and then maybe an Intel version.
- No need to if/else if just returning
- Sort includes
- Fix missing space in log message
- When closing the fd, set it to -1. It's better to later fail the
operation than to operate on another random file descriptor
- Add some spaces to improve readability
- Use pragma once
- Do not initialize members to zero, it's already the behavior for our
custom allocator
VideoIn class is created that allows to setup a v4l2 interface
and capture buffers. I is based on yavta utility by Laurent Pinchart
and has been tested only on the bebop, though yavta works on any linux
platform.
- Replace tabs with spaces
- Sort includes
- No need to ifdef Linux inside AP_HAL_Linux
- Use early returns on error rather than a chain o if/else
- Use pragma once
- No need to initialize class members to 0, it's already our default
behavior
The camera sensor is connected on i2c bus for config
and on a parallel bus on the main SoC.
Currently, the i2c driver remains userland, but this is intended to
change in the future. The v4l2_subdev part is the way to go in the future
and it is the mainline way of configuring i2c camera sensors on Linux.
Currently only the max framerate is supported because it is the one that
is to be used on the bebop optical flow.
If the attribute name is passed, then it is the one used to process the option
--target[s] of waf build. The board name should be used only in configuration
time. The build targets should be board/platform agnostic.
Now, instead of using `waf --target ArduCopter.sitl`, we use `waf --target
ArduCopter` and the binary continues named as "ArduCopter.sitl".
Newer esc firmware versions on bebop 1 and all the versions on bebop 2
have a different order for the motors in the i2c frame sent to the
esc contoller. This commit adds support for both versions by reading
the firmware version of the esc, using GET_INFO frame
Lucas De Marchi
Julien BERAUD
Tom Pittenger
José Roberto de Souza
Andrew Tridgell
Randy Mackay
Jonathan Challinger
Peter Barker
Gustavo Jose de Sousa