Difference between revisions of "Working with raw image data"

From ElphelWiki
Jump to: navigation, search
(Created page with "==Downloading== * Available options (channels can be 0..3): # set receiving buffer size in 4kB pages (thus 4096 equals to 16MB) echo {size} > /sys/devices/soc0/elphel393-mem...")
 
(Previewing)
(One intermediate revision by the same user not shown)
Line 1: Line 1:
 
==Downloading==
 
==Downloading==
 
* Available options (channels can be 0..3):
 
* Available options (channels can be 0..3):
  # set receiving buffer size in 4kB pages (thus 4096 equals to 16MB)
+
  <font size='2em'># set receiving buffer size in 4kB pages (thus 4096 equals to 16MB)
  echo {size} > /sys/devices/soc0/elphel393-mem\@0/buffer_pages_raw_chn2
+
  '''echo {size} > /sys/devices/soc0/elphel393-mem\@0/buffer_pages_raw_chn2'''
 
  # start from the N-th frame position in buffer. Currently, 0 or 1
 
  # start from the N-th frame position in buffer. Currently, 0 or 1
  echo 1 > /sys/devices/soc0/elphel393-videomem\@0/video_frame_number
+
  '''echo 1 > /sys/devices/soc0/elphel393-videomem\@0/video_frame_number'''
 
  # initiate transfer, wait for X-th frame (X - absolute frame number), 0 = no waiting
 
  # initiate transfer, wait for X-th frame (X - absolute frame number), 0 = no waiting
  echo X > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2
+
  '''echo X > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2'''
 
 
  # copy to file
 
  # copy to file
  cat /dev/image_raw2 > /tmp/test.raw
+
  '''cat /dev/image_raw2 > /tmp/test.raw'''
 
  # see in hex
 
  # see in hex
  hexdump /tmp/test.raw
+
  '''hexdump /tmp/test.raw'''
 
 
 
  # copy to PC
 
  # copy to PC
  scp /tmp/test.raw user@address:/path/
+
  '''scp /tmp/test.raw user@address:/path/'''</font>
 
 
  
 
* Minimal:
 
* Minimal:
  
  echo 4096 > /sys/devices/soc0/elphel393-mem\@0/buffer_pages_raw_chn2
+
  <font size='2em'>'''echo 4096 > /sys/devices/soc0/elphel393-mem\@0/buffer_pages_raw_chn2'''
  echo 0 > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2
+
  '''echo 0 > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2'''
  cat /dev/image_raw2 > /tmp/test.raw
+
  '''cat /dev/image_raw2 > /tmp/test.raw'''</font>
  
==Previewing==
+
==Displaying==

Revision as of 11:53, 12 January 2018

Downloading

  • Available options (channels can be 0..3):
# set receiving buffer size in 4kB pages (thus 4096 equals to 16MB)
echo {size} > /sys/devices/soc0/elphel393-mem\@0/buffer_pages_raw_chn2
# start from the N-th frame position in buffer. Currently, 0 or 1
echo 1 > /sys/devices/soc0/elphel393-videomem\@0/video_frame_number
# initiate transfer, wait for X-th frame (X - absolute frame number), 0 = no waiting
echo X > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2
# copy to file
cat /dev/image_raw2 > /tmp/test.raw
# see in hex
hexdump /tmp/test.raw
# copy to PC
scp /tmp/test.raw user@address:/path/
  • Minimal:
echo 4096 > /sys/devices/soc0/elphel393-mem\@0/buffer_pages_raw_chn2
echo 0 > /sys/devices/soc0/elphel393-videomem\@0/membridge_start2
cat /dev/image_raw2 > /tmp/test.raw

Displaying