How to use Pixycam data in programmes on BBB

JS88 · November 14, 2020, 6:06pm

I’m not sure how to use the camera with a Beaglebone Black in bespoke code, as in not just running the example. Assuming it is set up exactly as the documentation indicates:

Can I just make a C++ file calling a function from the pixy usb library (given correct headers are included), such as retrieving the x coordinate of a signature, and expect it to interpret the usb data from the pixy and provide that coordinate to the programme as it executes?
If so that’s great, where can a find a guide to the pixy functions/methods available in C++?
Can I instead use Python? In the github repository (that we clone as part of the setup instructions) I can’t seem to find any Python modules.

JS88 · November 16, 2020, 2:50pm

Sorry, I did find the Python API now, it is obviously possible with Python my mistake. I still haven’t found any guide for functions though. Are we intended just to learn from the examples maybe?

edge · November 17, 2020, 3:56am

Hello,
The C++ API is the same as Arduino:

https://docs.pixycam.com/wiki/doku.php?id=wiki:v2:general_api
https://docs.pixycam.com/wiki/doku.php?id=wiki:v2:ccc_api
https://docs.pixycam.com/wiki/doku.php?id=wiki:v2:line_api
https://docs.pixycam.com/wiki/doku.php?id=wiki:v2:video_api

The Python API needs to be properly documented. The available functions are laid out here:

github.com

charmedlabs/pixy2/blob/master/src/host/libpixyusb2_examples/python_demos/pixy.i

%module pixy


%include "stdint.i"
%include "carrays.i"
%include "typemaps.i"

%{
#define SWIG_FILE_WITH_INIT
#include "util.h"
#include "TPixy2.h"
#include "Pixy2Line.h"
#include "Pixy2CCC.h"
#include "libpixyusb2.h"
%}

%array_class(struct Block, BlockArray);
%array_class(struct Vector, VectorArray);
%array_class(struct Intersection, IntersectionArray);
%array_class(struct Barcode, BarcodeArray);

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Hope this helps!

Edward

JS88 · November 18, 2020, 10:46am

Hi,

Thanks Edward that is just what I was after.

Jack