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rpicompute

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Install

Flash module

on I/O module:

  • Pull the jumpers of USB SLAVE 1/2/3/4 SELECTION (you need to pull two jumpers here), set the BOOT ENABLE USB SLAVE jumpers to EN position.
  • Plug the USB SLAVE port of IO Board Plus into your host PC USB. (don’t need to connect power adapter to the IO Board Plus )
  • run rpiboot(sudo /share/rpi/rpiboot/rpiboot) to mount CM to PC

See Compute_Module_IO_Board_PLUS_User_Manual_EN.pdf for details;

Use raspbian-stretch-lite image to fit to 4GB of rpi compute

Flash CM's EMMC as described in official guide :

  • sudo ./rpiboot
  • sudo dd if=2019-04-08-raspbian-stretch-lite.img of=/dev/mmcblk0 bs=4MiB status=progress oflag=sync for sc-card or of=/dev/sdc for ComputeModule.
  • Raspbiand Desktop since 2019-04-08 also fit ot 4GB ComputeModule; Debian 10 based Raspbian can be installed too

To make a *.img from sdcard need to decrease partition size to aprox 125% of used space(unmount partiton, than sudo gparted /dev/mmcblk0) and than make opposite dd with bs=1MiB count=2048 for 2GB image.

Config:

  • default user: pi
  • default passwd: raspberry - don't forget to change with passwd
  • wifi - sudo raspi-config
  • set localization option to en.us-utf8 by sudo raspi-config
  • set correct timezonedpkg-reconfigure tzdata

wifi as perconfig:

  • create wpa_supplicant.conf at /boot;
  • add
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
network={
    ssid="YOUR_NETWORK_NAME"
    psk="YOUR_PASSWORD"
    key_mgmt=WPA-PSK
}
  • add ssh empty file to /boot to enable SSH server by default

installing GUI brake broadcom drivers; installing GUI, including Mate

sudo apt-get install lightdm
sudo apt-get install mate-desktop-environment-core

Autologin for Console:

  • raspi-config

  • Boot options

  • select autologin for console or GUI

Autologin for GUI:

  • at /etc/lightdm/lightdm.conf

  • autologin-user=USERNAME autologin-user-timeout=0

  • dpkg-reconfigure lightdm

SSH: ssh -Y pi@raspberrypi

VNC:

guide

sudo apt-get install realvnc-vnc-server realvnc-vnc-viewer

sudo raspi-config > Interface Option > VNC:yes

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dual Cam

  • sudo raspi-config and enable the camera;
  • wget https://www.raspberrypi.org/documentation/hardware/computemodule/dt-blob-dualcam.dts
  • dtc -I dts -O dtb -o dt-blob-dualcam.dtb dt-blob-dualcam.dts
  • sudo cp dt-blob-dualcam.dtb /boot/dt-blob.bin
  • sudo reboot to load blobs;
  • correct output is: vcgencmd get_camera : supported=2 detected=2

get images: raspistill -cs 0 -o image0.jpg for 1st camera and raspistill -cs 1 -o image1.jpg for second

OmniVision OV5647 - 2592 × 1944, FOV 160 raspistill -3d sbs -w 1280 -h 480 -o 1.jpg

TimeLapse

TimeLapse with raspicam

Note: raspicam can't make a long (100+) timelapse due to stability issue, so it's a good idea to use crontab -e together with short timelapses

stereo pi IO

perfect doc for cameras

1k RPI cam

#mode resolution status
1 1920x1080 ok, part sensor
2 2592x1944 ok
full sensor info
NoIR Cams

IRCamera mode(for real cams): sudo nano /boot/config.txt disable_camera_led=1 or 0

Examples for NoIR Cam's 1.3 and 2.x

Remote accecs

UV4L - remote camera acceess

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Video4Linux

At 2018.06 build Video4Linux driver is already included, but not loaded by default, so bcm2835-v4l2 need to be added to /etc/modules. v4l2-ctl --list-formats output a list of supported formats. Additional info can be found at rpi forum

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OpenCL for VC4

attempt to implement OpenCL 1.2 for pri, part 2

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I2C

Overclocking I2C for OLED display

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Oled SSD1306 0.96 Display

Great C++ lib

to compile need to remove -li2c on latest Raspbian(since spring 2018)

doc for lib

can be used as a frambuffer at least since 2019.05.14

add to /boot/config.txt

    dtoverlay=ssd1306,inverted,sequential
    dtparam=i2c_arm=on,i2c_baudrate=1000000

more info

use fb1 instead of fb0

con2fbmap 1 1

sudo dpkg-reconfigure console-setup - to change font

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Software

Swap file size

open sudo nano /etc/dphys-swapfile, than increase to 512MB CONF_SWAPSIZE=512

than restart

  • sudo /etc/init.d/dphys-swapfile stop
  • sudo /etc/init.d/dphys-swapfile start

add sources

sudo nano /etc/apt/sources.list and uncomment deb-src

ssh without password

ssh login without passwordcgparted

  • on pi: ssh-keygen -t rsa -b 4096 -C "ayaromenok@gmail.com"
  • on PC: ssh-copy-id pi@rpiIP

Partitions/ComputeModule only

Since rpi Compute have only 4GB of EMMC memory, it's necessary to move some data to SD/USBFlash drive, like:

/dev/sda1 /mnt/32GB ext4 defaults 0 1

 - /home/pi 
 - /usr/local
 - /usr/share
 - /usr/include
 - swap file
 - /var/cache/apt
  • looks like impossible to move /usr/lib even it should be possible according Unix standard ;)

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Qt

Qt 5.12

Memory split should be set to 64/128 MB to avoid EGLFS driver crash:

EGL Error : Could not create the egl surface: error = 0x3003

For every version of Raspberry Pi, you have to change -device:

  • Raspberry Pi 1 (+ Zero and Zero W): -device linux-rasp-pi-g++
  • Raspberry Pi 2: -device linux-rasp-pi2-g++
  • Raspberry Pi 3: -device linux-rasp-pi3-g++ - close-source broadcom stack
  • Raspberry Pi 3 with VC4 driver: `-device linux-rasp-pi3-vc4-g++`` - open-source experimental stack

Dependencies:

  • sudo apt-get build-dep qt4-x11
  • sudo apt-get build-dep libqt5gui5
  • sudo apt-get install libudev-dev libinput-dev libts-dev libxcb-xinerama0-dev libxcb-xinerama0
  • for multimedia\gstreamer - sudo apt-get install gstreamer1.0-alsa libasound2-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev gstreamer1.0-plugins-good gstreamer1.0-plugins-bad libraspberrypi-dev libpulse-dev alsa-base gstreamer1.0-omx libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev

Broadcom libs instead of Mesa:

  • ln -s /opt/vc/lib/libbrcmEGL.so /usr/lib/arm-linux-gnueabihf/libEGL.so

  • ln -s /opt/vc/lib/libbrcmGLESv2.so /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.0.0

For cross-compilation:

./configure -release -opengl es2 -device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=~/sdk/rpi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf- -sysroot ~/sdk/rpi/sysroot -opensource -confirm-license -make libs -prefix /usr/local/qt5pi -extprefix ~/sdk/rpi/qt5pi -hostprefix ~/sdk/rpi/qt5 -v

For RPI compilation ./configure --release -opengl es2 -opensource -confirm-license -make libs -no-use-gold-linker

mkdir build
cd build
mkdir qt
cd qt
../../qt/configure --release -opengl es2 \
        -opensource -confirm-license \
        -prefix /usr/local \
        -skip qtlocation \
        -skip qtwebengine \
        -skip qtwebchannel \
        -skip qtwebglplugin \
        -skip qtwebsockets \
        -skip qtwebview \
        -skip qtcanvas3d \
        -skip qtdatavis3d \
	       -skip qtvirtualkeyboard

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OpenCV

sudo apt-get install build-essential cmake pkg-config libjpeg-dev libpng-dev libtiff-dev libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev

Gstreamer and most of the dev libs already installed with Qt from above

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules -D ENABLE_NEON=ON -D ENABLE_VFPV3=ON -D BUILD_TESTS=OFF -D BUILD_EXAMPLES=OFF -D WITHQT=ON ..

Note WITH_OPENGL=ON will try to use Desktop GL

POCL

sudo apt install libhwloc-dev ocl-icd-opencl-dev libglew-dev zlib1g-dev libedit-dev

sudo apt install clang-4.0 libclang-4.0-dev

cmake -DLLC_HOST_CPU=cortex-a53 -DWITH_LLVM_CONFIG=/usr/bin/llvm-config-4.0 -DENABLE_ICD=0 -DEXTRA_KERNEL_CL_FLAGS=-mfpu=neon -DEXTRA_KERNEL_CXX_FLAGS=-mfpu=neon ../../pocl

installed OpenCL driver:

./poclcc -l
LIST OF DEVICES:
0:
  Vendor:   ARM
    Name:   pthread-cortex-a53
 Version:   OpenCL 1.2 pocl HSTR: pthread-armv6-unknown-linux-gnueabihf-cortex-a53

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Other OS

MotionEYE OS

Motion EYE OS - use RPi3 as a Security Camera. both CSI and USB cams supported

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Ubuntu Mate

18.04 - 32 or 64 bit

  • can't be installed directly to RPi3A due to low memory issue, but can be run when already installed on RPi3B.
  • 64bit don't have any h\w acceleration :()
  • don't recognize HDMI display for now

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Android

Android 10/LineageOS 17.1

  • not working - Hardware video decoding & encoding (software decoding & encoding works)
  • gapps

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CNC

laser4web

sudo systemctl status lw.comm-server

start|stop|restart

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