| libdir = /opt/opencv-4.1.0/lib | |
| includedir = /opt/opencv-4.1.0/include/opencv4 | |
| Name: OpenCV | |
| Description: OpenCV (Open Source Computer Vision Library) is an open source computer vision and machine learning software library. | |
| Version: 4.1.0 | |
| Libs: -L${libdir} -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_calib3d -lopencv_ccalib -lopencv_core -lopencv_datasets -lopencv_dnn_objdetect -lopencv_dnn -lopencv_dpm -lopencv_face -lopencv_features2d -lopencv_flann -lopencv_freetype -lopencv_fuzzy -lopencv_gapi -lopencv_hfs -lopencv_highgui -lopencv_imgcodecs -lopencv_img_hash -lopencv_imgproc -lopencv_line_descriptor -lopencv_ml -lopencv_objdetect -lopencv_optflow -lopencv_phase_unwrapping -lopencv_photo -lopencv_plot -lopencv_quality -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_shape -lopencv_stereo -lopencv_stitching -lopencv_structured_light -lopencv_superres -lopencv_surface_matching -lopencv_text -lopencv_tracking -lopencv_videoio -lopencv_video -lopencv_videostab -lopencv_xfeatures2d -lopencv |
Based on https://www.gnu.org/software/make/manual/html_node/Quick-Reference.html
| Directive | Description |
|---|---|
define variable define variable = define variable := define variable ::= define variable += define variable ?= endef |
Define multi-line variables. |
undefine variable |
Undefining variables. |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| /* | |
| * MCrypt API available online: | |
| * http://linux.die.net/man/3/mcrypt | |
| */ | |
| #include <mcrypt.h> |
| /** | |
| * Mosquitto C++ Wrapper | |
| * (C) 2017, Felix Niederwanger | |
| * MIT License | |
| */ | |
| #ifndef _MOSQUITTO_HPP_ | |
| #define _MOSQUITTO_HPP_ | |
| #include <string> |
2017-03-03 fm4dd
The gcc compiler can optimize code by taking advantage of CPU specific features. Especially for ARM CPU's, this can have impact on application performance. ARM CPU's, even under the same architecture, could be implemented with different versions of floating point units (FPU). Utilizing full FPU potential improves performance of heavier operating systems such as full Linux distributions.
These flags can both be used to set the CPU type. Setting one or the other is sufficient.
| #include <stdio.h> | |
| #include <string.h> | |
| #include <fcntl.h> | |
| #include <linux/i2c-dev.h> | |
| // Terrible portability hack between arm-linux-gnueabihf-gcc on Mac OS X and native gcc on raspbian. | |
| #ifndef I2C_M_RD | |
| #include <linux/i2c.h> | |
| #endif |
Here are two simple programs testing the performance of my rpio library against popular alternatives which use the /sys interface (with the number of npm stars indicated for a rough idea of popularity).
This test is based on an example on the rpi-gpio page.
As modules which uses /sys depend upon asynchronous behaviour they require callbacks to ensure that the next operation starts only when the previous one has completed.
This gist describes the necessary software installation steps for a Raspberry PI in order to enable the PI's camera to act as an external camera for the Dragonfly Java application. This gist shows, how to make a Raspberry PI an RTSP streaming server. The resulting feed can then be used as input for the Dragonfly Java app or the Accuware Dragonfly Demo - Calibration Mode server. The RTSP server on the Raspberry PI must be made publicly available, if calibration is a requirement.
| #!/bin/bash | |
| # Set up a Raspberry Pi 4 as a USB-C Ethernet Gadget | |
| # Based on: | |
| # - https://www.hardill.me.uk/wordpress/2019/11/02/pi4-usb-c-gadget/ | |
| # - https://pastebin.com/VtAusEmf | |
| if ! $(grep -q dtoverlay=dwc2 /boot/config.txt) ; then | |
| echo "Add the line dtoverlay=dwc2 to /boot/config.txt" | |
| exit | |
| fi |
I owe my very rapid learning journey in the world of ConfigFs to several key sources which aren't necessarily relevant to this result, but I feel deserve a mention anyway.