Difference between revisions of "Working with raw image data"
From ElphelWiki
(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...") |
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==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> |
| − | == | + | ==Displaying== |
Revision as of 10:53, 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
