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