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top - 15:07:12 up 3 min,  1 user,  load average: 0.93, 0.48, 0.19

Tasks: 111 total,   1 running, 110 sleeping,   0 stopped,   0 zombie

%Cpu(s):  2.2 us,  1.7 sy,  0.0 ni, 94.1 id,  2.1 wa,  0.0 hi,  0.0 si,  0.0 st

KiB Mem:    884380 total,   309792 used,   574588 free,    18640 buffers

KiB Swap:   102396 total,        0 used,   102396 free,   154808 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND           

 2555 root      20   0 53280  28m  16m S   5.3  3.3   0:14.19 Xorg              

 2810 pi        20   0 98852  20m  17m S   2.6  2.4   0:02.61 lxterminal        

 2695 pi        20   0  128m  26m  22m S   2.3  3.0   0:03.67 lxpanel           

 2830 pi        20   0  391m 128m  67m S   2.0 14.9   1:15.68 epiphany-browse   

 2899 pi        20   0  4496 2416 2060 R   0.7  0.3   0:00.74 top               

    1 root      20   0  2148 1244 1140 S   0.3  0.1   0:00.86 init              

    6 root      20   0     0    0    0 D   0.3  0.0   0:00.63 kworker/u8:0      

 2197 nobody    20   0  2024 1468 1352 S   0.3  0.2   0:00.38 thd               

 2693 pi        20   0 21080  12m 9052 S   0.3  1.4   0:01.62 openbox           

 2703 root      20   0     0    0    0 S   0.3  0.0   0:00.44 kworker/u8:3      

 2909 pi        20   0 89712  18m  15m S   0.3  2.1   0:00.88 leafpad           

    2 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kthreadd          

    3 root      20   0     0    0    0 S   0.0  0.0   0:00.13 ksoftirqd/0       

    4 root      20   0     0    0    0 S   0.0  0.0   0:00.00 kworker/0:0       

    5 root       0 -20     0    0    0 S   0.0  0.0   0:00.00 kworker/0:0H      

    7 root      20   0     0    0    0 S   0.0  0.0   0:00.36 rcu_preempt       

    8 root      20   0     0    0    0 S   0.0  0.0   0:00.00 rcu_sched          

$ irrecord /storage/.config/lircd.conf

[링크 : http://wiki.openelec.tv/index.php?title=Guide_To_lirc_rpi_GPIO_Receiver] 

$ cat lircd.conf

# Please make this file available to others

# by sending it to <lirc@bartelmus.de>

#

# this config file was automatically generated

# using lirc-0.9.1-git(default) on Tue Aug 11 02:51:10 2015

#

# contributed by

#

# brand:                       /storage/lircd.conf

# model no. of remote control:

# devices being controlled by this remote:

#

begin remote

  name  /storage/.config/lircd.conf

  bits           16

  flags SPACE_ENC|CONST_LENGTH

  eps            30

  aeps          100

  header       9085  4524

  one           646  1604

  zero          646   490

  ptrail        646

  pre_data_bits   16

  pre_data       0xFF

  gap          108567

  toggle_bit_mask 0x0

      begin codes

          KEY_UP                   0x7A85

          KEY_DOWN                 0x1AE5

          KEY_LEFT                 0x609F

          KEY_RIGHT                0x20DF

          KEY_OK                   0x9A65

          KEY_PLAY                 0xE01F

          KEY_FASTFORWARD          0x42BD

          KEY_STOP                 0x629D

          KEY_MENU                 0xC03F

          KEY_EXIT                 0x50AF

          KEY_VOLUMEUP             0xA25D

          KEY_VOLUMEDOWN           0x22DD

       end codes

end remote 

$ sudo mv /usr/share/X11/xorg.conf.d/99-fbturbo.conf ~

$ sudo nano /usr/share/X11/xorg.conf.d/99-pitft.conf

Section "Device"

  Identifier "Adafruit PiTFT"

  Driver "fbdev"

  Option "fbdev" "/dev/fb1"

EndSection

$ sudo raspi-config

Then pick the Enable Boot to Desktop/Scratch option and choose if you want to boot to the console, desktop, or scratch environment.  

/etc/X11/xorg.conf.d/99-calibration.conf

Option "EmulateThirdButton" "1"

Option "EmulateThirdButtonTimeout" "750"

Option "EmulateThirdButtonMoveThreshold" "30"

So for example your file will look like:

Section "InputClass"

   Identifier      "calibration"

   MatchProduct    "stmpe-ts"

   Option  "Calibration"   "3800 120 200 3900"

   Option  "SwapAxes"      "1"

   Option "EmulateThirdButton" "1"

   Option "EmulateThirdButtonTimeout" "750"

   Option "EmulateThirdButtonMoveThreshold" "30"

EndSection 

dtoverlay=pitft28r,rotate=90,speed=62000000,fps=25

Or whatever you like for speed, rotation, and frames-per-second. BUT, here's the thing, the Pi only supports a fixed number of SPI frequencies. So tweaking the number a little won't do anything. The kernel will round the number to the closest value. You will always get frequencies that are 250MHz divided by an even number. Here's the only SPI frequencies this kernel supports

15,625,000 (a.k.a 16000000 = 16 MHz)

17,857,142 (a.k.a. 18000000 = 18 MHz)

20,833,333 (a.k.a 21000000 = 21 MHz)

25,000,000 (= 25 MHz)

31,250,000 (a.k.a 32000000 = 32MHz)

41,666,666 (a.k.a 42000000 = 42MHz)

62,500,000 (a.k.a 62000000 = 62MHz) 

use videocore GPU command  to switch off or on HDMI service thus saving valuable watts :)

Switch on

“/opt/vc/bin/tvservice -p”

Switch off

“/opt/vc/bin/tvservice -o” 

MMAL (Multi-Media Abstraction Layer) is a framework which is used to provide a host-side, simple and relatively low-level interface to multimedia components running on VideoCore. It also provides a component interface so that new components can be easily created and integrated into the framework.

There is no requirement that all the components be running on VideoCore as MMAL doesn't put any restriction on where components live. The current implementation for instance provides some components which can be run on both host-side or VideoCore (e.g. the splitter component).

[링크 : http://www.jvcref.com/files/PI/documentation/html/] 

VideoCore is a low-power mobile multimedia processor architecture originally developed by Alphamosaic Ltd and now owned by Broadcom. Its two-dimensional DSP architecture makes it flexible and efficient enough to decode as well as encode a number of multimedia codecs in software, while maintaining low power usage. The semiconductor intellectual property core (SIP core) has been found so far only on Broadcom SoCs.

[링크 : https://en.wikipedia.org/wiki/VideoCore] 

pi@raspberrypi ~ $ raspivid -t 0 -v

raspivid Camera App v1.3.12

Width 1920, Height 1080, filename (null)

bitrate 17000000, framerate 30, time delay 0

H264 Profile high

H264 Quantisation level 0, Inline headers No

H264 Intra refresh type (null), period -1

Wait method : Capture forever

Initial state 'record'

Preview Yes, Full screen Yes

Preview window 0,0,1024,768

Opacity 255

Sharpness 0, Contrast 0, Brightness 50

Saturation 0, ISO 0, Video Stabilisation No, Exposure compensation 0

Exposure Mode 'auto', AWB Mode 'auto', Image Effect 'none'

Metering Mode 'average', Colour Effect Enabled No with U = 128, V = 128

Rotation 0, hflip No, vflip No

ROI x 0.000000, y 0.000000, w 1.000000 h 1.000000

Camera component done

Encoder component done

Starting component connection stage

Connecting camera preview port to preview input port

Starting video preview

Connecting camera stills port to encoder input port

Enabling encoder output port