구차니의 잡동사니 모음

char *fileName = "/dev/i2c-0";

fd = open(fileName, O_RDWR);

ioctl(fd, I2C_SLAVE, address);

write(fd, buf, 1);

read(fd, buf, 2); 

pi@raspberrypi ~ $ i2cdetect

Error: No i2c-bus specified!

Usage: i2cdetect [-y] [-a] [-q|-r] I2CBUS [FIRST LAST]

       i2cdetect -F I2CBUS

       i2cdetect -l

  I2CBUS is an integer or an I2C bus name

  If provided, FIRST and LAST limit the probing range. 

pi@raspberrypi ~ $ i2cdetect -y 1

Error: Could not open file `/dev/i2c-1' or `/dev/i2c/1': No such file or directory 

pi@raspberrypi ~ $ sudo i2cdetect -y 1

Error: Could not open file `/dev/i2c-1' or `/dev/i2c/1': No such file or directory

pi@raspberrypi ~ $ dmesg | grep i2c

[    3.872815] bcm2708_i2c_init_pinmode(1,2)

[    3.874707] bcm2708_i2c_init_pinmode(1,3)

[    3.877782] bcm2708_i2c 3f804000.i2c: BSC1 Controller at 0x3f804000 (irq 79) (baudrate 100000) 

$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs

$ mkdir mnt/fat32

$ mkdir mnt/ext4

$ sudo mount /dev/sdb1 mnt/fat32

$ sudo mount /dev/sdb2 mnt/ext4

$ sudo make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=mnt/ext4 modules_install

$ sudo cp mnt/fat32/$KERNEL.img mnt/fat32/$KERNEL-backup.img

$ sudo scripts/mkknlimg arch/arm/boot/zImage mnt/fat32/$KERNEL.img

$ sudo cp arch/arm/boot/dts/*.dtb mnt/fat32/

$ sudo cp arch/arm/boot/dts/overlays/*.dtb* mnt/fat32/overlays/

$ sudo cp arch/arm/boot/dts/overlays/README mnt/fat32/overlays/

$ sudo umount mnt/fat32

$ sudo umount mnt/ext4

[링크 : https://www.raspberrypi.org/documentation/linux/kernel/building.md]

$ sudo ./scripts/mkknlimg arch/arm/boot/zImage ~/KERNEL.img

Version: Linux version 4.1.6-v7+ (minimonk@devmini) (gcc version 4.8.3 20140303 (prerelease) (crosstool-NG linaro-1.13.1+bzr2650 - Linaro GCC 2014.03) ) #1 SMP PREEMPT Tue Aug 18 23:54:39 KST 2015

DT: y

283x: n

$ ls -al ~/KERNEL.img

-rw-r--r-- 1 root root 4031680  8월 23 16:19 /home/minimonk/KERNEL.img

$ file ~/KERNEL.img

/home/minimonk/KERNEL.img: Linux kernel ARM boot executable zImage (little-endian)

$ diff arch/arm/boot/zImage ~/KERNEL.img

Binary files arch/arm/boot/zImage and /home/minimonk/KERNEL.img differ  

$ sudo apt-get install python-picamera 

[1978205048] [NTC] [ALL] [Aug 19 22:48:49] motion_startup: Using log type (ALL) log level (WRN)

[1] [ALR] [VID] [Aug 19 22:48:49] mmalcam_start: MMAL Camera thread starting... for camera (vc.ril.camera) of 1024 x 576 at 2 fps

[1] [ALR] [VID] [Aug 19 22:48:49] mmalcam_start: MMAL Camera using video capture

[1] [ALR] [VID] [Aug 19 22:55:37] MMAL Camera cleanup 

# Maximum number of frames to be captured per second.

# Valid range: 2-100. Default: 100 (almost no limit).

framerate 1

############################################################

# OpenMax/MMAL camera support for Raspberry Pi

############################################################

mmalcam_name vc.ril.camera

[1] [ERR] [VID] [Aug 20 09:54:36] Failed to create MMAL camera component create_camera_component 

$ sudo apt-get install motion

패키지 목록을 읽는 중입니다... 완료

의존성 트리를 만드는 중입니다

상태 정보를 읽는 중입니다... 완료

다음 패키지를 더 설치할 것입니다:

  ffmpeg libav-tools libavdevice53 libavfilter2 libavfilter3 libavresample1

  libmysqlclient18 libopencv-core2.3 libopencv-imgproc2.3 libpq5 mysql-common

제안하는 패키지:

  frei0r-plugins mysql-client postgresql-client

다음 새 패키지를 설치할 것입니다:

  ffmpeg libav-tools libavdevice53 libavfilter2 libavfilter3 libavresample1

  libmysqlclient18 libopencv-core2.3 libopencv-imgproc2.3 libpq5 motion

  mysql-common

0개 업그레이드, 12개 새로 설치, 0개 제거 및 0개 업그레이드 안 함.

6,247 k바이트 아카이브를 받아야 합니다.

이 작업 후 18.0 M바이트의 디스크 공간을 더 사용하게 됩니다.

계속 하시겠습니까 [Y/n]?

$ sudo apt-get remove motion

패키지 목록을 읽는 중입니다... 완료

의존성 트리를 만드는 중입니다

상태 정보를 읽는 중입니다... 완료

다음 패키지가 자동으로 설치되었지만 더 이상 필요하지 않습니다:

  ffmpeg libmysqlclient18 libpq5 mysql-common

Use 'apt-get autoremove' to remove them.

다음 패키지를 지울 것입니다:

  motion

0개 업그레이드, 0개 새로 설치, 1개 제거 및 0개 업그레이드 안 함.

이 작업 후 758 k바이트의 디스크 공간이 비워집니다.

계속 하시겠습니까 [Y/n]?

(데이터베이스 읽는중 ...현재 85877개의 파일과 디렉터리가 설치되어 있습니다.)

motion 패키지를 지우는 중입니다 ...

[....] Stopping motion detection daemon: motionNo /usr/bin/motion found running; none killed.

. ok

[....] Stopping motion detection daemon: motionNo /usr/bin/motion found running; none killed.

. ok

man-db에 대한 트리거를 처리하는 중입니다 ...

$ vi motion-mmalcam.conf

# Start in daemon (background) mode and release terminal (default: off)

daemon on

# Restrict stream connections to localhost only (default: on)

stream_localhost off

# Image width (pixels). Valid range: Camera dependent, default: 352

width 1024

# Image height (pixels). Valid range: Camera dependent, default: 288

height 576

# Maximum number of frames to be captured per second.

# Valid range: 2-100. Default: 100 (almost no limit).

framerate 1

$ sudo ./motion -c motion-mmalcam.conf

[1978205048] [NTC] [ALL] conf_load: Processing thread 0 - config file motion-mmalcam.conf

[1978205048] [NTC] [ALL] motion_startup: Motion mmaltest Started

[1978205048] [NTC] [ALL] motion_startup: Logging to file (/home/pi/motion.log) 

To install Weston, just issue:

    sudo apt-get update

    sudo apt-get install weston

This will install also a script called weston-launch (not the real weston-launch program), which will automatically set up XDG_RUNTIME_DIR for you and run weston. Running Weston with this package is as simple as:

    weston-launch

A too old firmware may cause rpi-backend to malfunction on Raspberry Pi. 

[링크 : http://wayland.freedesktop.org/raspberrypi.html]

    [링크 : http://archlinuxarm.org/forum/viewtopic.php?f=5&t=4975]

create ~/.config/weston.ini containing the following:

[core]

backend=fbdev-backend.so

[링크 : https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=102729] 

# cd ~

# mkdir .config

# cd .config

# vi weston.ini

backend=fbdev-backend.so