bbb-notes.txt

## ===============
## Running servers
## ===============

# Access the board
ssh root@192.168.7.2


# Onboard server location
/var/lib/cloud9/websocket-server/beaglebone-black/bbb-pwm
run `node websocket-server.js`
on bbb.


# Remote control source code location
~/websocket-client
・Copy the source code to your computer and run
`node web-server.js` on your computer

## =================
## PWM pin debugging
## =================

# PWM pin diagram
http://beagleboard.org/support/BoneScript/analogWrite/


# usable pwm ports
P8_13
P9_22
P9_42

# Check available PWM slots
ls /lib/firmware/*pwm*

# Slots
more /sys/devices/bone_capemgr.*/slots

# To mount into slow
echo am33xx_pwm > /sys/devices/bone_capemgr.9/slots 
echo bone_pwm_P8_13 > /sys/devices/bone_capemgr.9/slots


# Enable slot permanent
vim /boot/uboot/uEnv.txt

optargs=quiet drm.debug=7 capemgr.enable_partno=am33xx_pwm,bone_pwm_P8_13,bone_pwm_P8_45,bone_pwm_P8_46

# Check the period, and duty cycle
ls /sys/devices/ocp.*/pwm_test_P8_13.1*/

# Check period
cat /sys/devices/ocp.*/pwm_test_P8_13.1*/period

# Set period
echo 5000000 > /sys/devices/ocp.*/pwm_test_P8_13*/period
echo 5000000 > /sys/devices/ocp.*/pwm_test_P9_22*/period
echo 5000000 > /sys/devices/ocp.*/pwm_test_P9_42*/period

## ======================
## Additional information
## ======================

# pwm problem
http://saadahmad.ca/using-pwm-on-the-beaglebone-black/
# kernel compile patch
https://randomlinuxhacks.wordpress.com/2014/09/16/changing-pwm-period-on-beaglebone-black/
# solution
https://github.com/SaadAhmad/beaglebone-black-cpp-PWM

# Compiling device overlay   
https://learn.adafruit.com/introduction-to-the-beaglebone-black-device-tree/compiling-an-overlay

dtc -O dtb -o ADAFRUIT-SPI0-00A0.dtbo -b 0 -@ ADAFRUIT-SPI0-00A0.dts

P8_13 layout file =>  
https://github.com/beagleboard/devicetree-source/blob/master/arch/arm/boot/dts/bone_pwm_P8_13-00A0.dts

# Internet sharing with OS X
1. Watch this video: http://www.youtube.com/watch?v=Cf9hnscbSK8 
2. If your BBB was shipped after November 2013, instead of screen /dev/tty.usb*B 115200 use screen /dev/tty.usb* 115200 and actually you need to go to the /dev directory and check which of the tty.usbXXX is available for your BBB and screen it. In my case it was tty.usb131 for example
3. You continue the steps just like in the video until opkg update which would be the thing you need to do over the internet 

Need udhcpc command.
# Download udhcpc
https://gist.github.com/tcr/7f753f93b671733c9e72
# Change bob default ip addresses
http://ewong.me/changing-usb0-ip-address-on-the-beaglebone-black/
====
/etc/network/interfaces
/opt/scripts/boot/am335x_evm.sh
/etc/udhcpd.conf
====
In /etc/network/interfaces and /opt/scripts/boot/am335x_evm.sh, change "192.68.7.2" to "192.68.8.2" (or whatever you want the new IP address to be).

In /etc/udhcpd.conf, change "192.168.7.1" to "192.168.8.1" in two places. This file configures the DHCP IP address that is given to your PC when it initializes the USB virtual ethernet internet. Keep in mind that the default netmask for the usb0 interface is 255.255.255.252, so make sure your new IP addresses are compatible with that.

After making these changes and rebooting, the IP address for usb0 on your BeagleBone Black should be 192.168.8.2 and the IP address for the virtual ethernet interface on the PC side should be 192.168.8.1.
====
#google groups (good try)
https://groups.google.com/forum/#!topic/beagleboard/5yoQWMNfvH4


# BBB opencv cross compiling
http://thebbbdiary.blogspot.jp/2015/01/cross-compiling-opencv-on-os-x-for.html
ARM cross-compiling on Mac OS-X Mavericks
http://will-tm.com/cross-compiling-mac-os-x-mavericks/

# Opencv on ubuntu
https://solarianprogrammer.com/2014/04/21/opencv-beaglebone-black-ubuntu/

# Webcam driver
http://dumb-looks-free.blogspot.jp/2014/05/beaglebone-black-bbb-with-logitech-c270.html

# List video devices
https://trac.ffmpeg.org/wiki/Capture/Webcam

v4l2-ctl --list-devices
v4l2-ctl --list-formats-ext
ffmpeg -y -f video4linux2 -i /dev/video0

# Capture frame
apt-get install fswebcam
fswebcam -S 5 -r 352x288 test.jpg

# Capture video
ffmpeg -f video4linux2 -framerate 25 -video_size 640x480 -i /dev/video0 output.mkv
ffmpeg -f video4linux2 -r 25 -s 352x288 -t 5 -i /dev/video0 out.mpeg

http://derekmolloy.ie/beaglebone/beaglebone-video-capture-and-image-processing-on-embedded-linux-using-opencv/


# View image in terminal
sudo apt-get install caca-utils
cacaview /PATH/TO/image.jpg

# Video stream
http://bellbind.tumblr.com/post/62486278433/amazon-co-jp-ibuffalo-130-web

mplayer -vf framestep=2 -vo caca -quiet out.mpg
# Adjust brightness
v4l2-ctl --set-ctrl brightness=20

# See the video in terminal
mplayer -vo caca /PATH/TO/video.mpg
mplayer -vf framestep=2 -vo caca -quiet out.mpg

# OpenCV Video capture sample cpp
http://derekmolloy.ie/beaglebone/beaglebone-video-capture-and-image-processing-on-embedded-linux-using-opencv/


# Compile opencv3 on bbb

cd opencv
mkdir build && cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_CUDA=OFF -D WITH_CUFFT=OFF -D WITH_CUBLAS=OFF -D WITH_NVCUVID=OFF -D WITH_OPENCL=OFF -D WITH_OPENCLAMDFFT=OFF -D WITH_OPENCLAMDBLAS=OFF -D BUILD_opencv_apps=OFF -D BUILD_DOCS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_TESTS=OFF -D ENABLE_NEON=on ..
make
sudo make install
sudo ldconfig


# For TLD contrib
cmake -DOPENCV_EXTRA_MODULES_PATH=<opencv_contrib>/modules <opencv_source_directory>

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_CUDA=OFF -D WITH_CUFFT=OFF -D WITH_CUBLAS=OFF -D WITH_NVCUVID=OFF -D WITH_OPENCL=OFF -D WITH_OPENCLAMDFFT=OFF -D WITH_OPENCLAMDBLAS=OFF -D BUILD_opencv_apps=OFF -D BUILD_DOCS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_TESTS=OFF -D ENABLE_NEON=on -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules ..

# opencv modules only necessary
-D BUILD_opencv_calib3d=OFF -D BUILD_opencv_cudaarithm=OFF -D BUILD_opencv_cudabgsegm=OFF -D BUILD_opencv_cudacodec=OFF -D BUILD_opencv_cudafeatures2d=OFF -D BUILD_opencv_cudafilters=OFF -D BUILD_opencv_cudaimgproc=OFF -D BUILD_opencv_cudalegacy=OFF -D BUILD_opencv_cudaobjdetect=OFF -D BUILD_opencv_cudaoptflow=OFF -D BUILD_opencv_cudastereo=OFF -D BUILD_opencv_cudawarping=OFF -D BUILD_opencv_cudev=OFF -D BUILD_opencv_features2d=OFF -D BUILD_opencv_flann=OFF -D BUILD_opencv_java=OFF -D BUILD_opencv_photo=OFF -D BUILD_opencv_python=OFF -D BUILD_opencv_shape=OFF -D BUILD_opencv_stitching=OFF -D BUILD_opencv_superres=OFF -D BUILD_opencv_ts=OFF -D BUILD_opencv_viz=OFF -D BUILD_opencv_world=OFF

# contrib with only tracking
-D BUILD_opencv_adas=OFF -D BUILD_opencv_bgsegm=OFF -D BUILD_opencv_bioinspired=OFF -D BUILD_opencv_ccalib=OFF -D BUILD_opencv_cvv=OFF -D BUILD_opencv_datasets=OFF -D BUILD_opencv_datasettools=OFF -D BUILD_opencv_face=OFF -D BUILD_opencv_latentsvm=OFF -D BUILD_opencv_line_descriptor=OFF -D BUILD_opencv_matlab=OFF -D BUILD_opencv_optflow=OFF -D BUILD_opencv_reg=OFF -D BUILD_opencv_rgbd=OFF -D BUILD_opencv_saliency=OFF -D BUILD_opencv_surface_matching=OFF -D BUILD_opencv_text=OFF -D BUILD_opencv_xfeatures2d=OFF -D BUILD_opencv_ximgproc=OFF -D BUILD_opencv_xobjdetect=OFF -D BUILD_opencv_xphoto=OFF -D BUILD_opencv_stereo=OFF


# this is the biggest command I ever saw O.O
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_CUDA=OFF -D WITH_CUFFT=OFF -D WITH_CUBLAS=OFF -D WITH_NVCUVID=OFF -D WITH_OPENCL=OFF -D WITH_OPENCLAMDFFT=OFF -D WITH_OPENCLAMDBLAS=OFF -D BUILD_opencv_apps=OFF -D BUILD_DOCS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_TESTS=OFF -D ENABLE_NEON=on -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules -D WITH_FFMPEG=OFF -D BUILD_opencv_calib3d=OFF -D BUILD_opencv_cudaarithm=OFF -D BUILD_opencv_cudabgsegm=OFF -D BUILD_opencv_cudacodec=OFF -D BUILD_opencv_cudafeatures2d=OFF -D BUILD_opencv_cudafilters=OFF -D BUILD_opencv_cudaimgproc=OFF -D BUILD_opencv_cudalegacy=OFF -D BUILD_opencv_cudaobjdetect=OFF -D BUILD_opencv_cudaoptflow=OFF -D BUILD_opencv_cudastereo=OFF -D BUILD_opencv_cudawarping=OFF -D BUILD_opencv_cudev=OFF -D BUILD_opencv_features2d=OFF -D BUILD_opencv_flann=OFF -D BUILD_opencv_java=OFF -D BUILD_opencv_photo=OFF -D BUILD_opencv_python=OFF -D BUILD_opencv_shape=OFF -D BUILD_opencv_stitching=OFF -D BUILD_opencv_superres=OFF -D BUILD_opencv_ts=OFF -D BUILD_opencv_viz=OFF -D BUILD_opencv_world=OFF -D BUILD_opencv_adas=OFF -D BUILD_opencv_bgsegm=OFF -D BUILD_opencv_bioinspired=OFF -D BUILD_opencv_ccalib=OFF -D BUILD_opencv_cvv=OFF -D BUILD_opencv_datasets=OFF -D BUILD_opencv_datasettools=OFF -D BUILD_opencv_face=OFF -D BUILD_opencv_latentsvm=OFF -D BUILD_opencv_line_descriptor=OFF -D BUILD_opencv_matlab=OFF -D BUILD_opencv_optflow=OFF -D BUILD_opencv_reg=OFF -D BUILD_opencv_rgbd=OFF -D BUILD_opencv_saliency=OFF -D BUILD_opencv_surface_matching=OFF -D BUILD_opencv_text=OFF -D BUILD_opencv_xfeatures2d=OFF -D BUILD_opencv_ximgproc=OFF -D BUILD_opencv_xobjdetect=OFF -D BUILD_opencv_xphoto=OFF -D BUILD_opencv_stereo=OFF ..