Difference between revisions of "EBC Exercise 19 DSS2 and sysfs"
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Here are some example DSS2 sysfs commands. Play around and see what you can learn. | Here are some example DSS2 sysfs commands. Play around and see what you can learn. | ||
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=== Investigate mplayer === | === Investigate mplayer === | ||
− | + | Load Big Buck Bunny. This took some 3 minutes for me. | |
+ | beagle$ '''cd exercises/gstreamer''' | ||
+ | beagle$ '''git clone git://github.com/MarkAYoder/esc-media.git''' | ||
+ | beagle$ '''cd esc-media''' | ||
+ | |||
+ | Now, start Big Buck Bunny and discover how it uses DSS | ||
+ | beagle$ '''mplayer BigBuckBunny_640x360.m4v''' | ||
beagle$ '''cd /sys/devices/platform/omapdss''' | beagle$ '''cd /sys/devices/platform/omapdss''' | ||
beagle$ '''ls''' | beagle$ '''ls''' | ||
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Can you get mplayer to appear in two windows? | Can you get mplayer to appear in two windows? | ||
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Revision as of 06:49, 20 September 2012
Embedded Linux Class by Mark A. Yoder
Here are some example DSS2 sysfs commands. Play around and see what you can learn.
Contents
Framebuffers
The framebuffers are in /sys/class/graphics/.
beagle$ ls -F /sys/class/graphics/ fb0@ fb1@ fb2@ fbcon@ beagle$ cd /sys/class/graphics/fb0 beagle$ ls -F bits_per_pixel dev modes pan rotate_type subsystem@ blank device@ name phys_addr size uevent console mirror overlays power/ state virt_addr cursor mode overlays_rotate rotate stride virtual_size
Overlays, Managers and Displays
The overlays, managers and displays are in /sys/devices/platform/omapdss/
beagle$ cd /sys/devices/platform/omapdss/ beagle$ ls -F display0@ manager1/ overlay0/ subsystem@ display1@ microamps_requested_vdda_dac overlay1/ uevent driver@ microamps_requested_vdds_dsi overlay2/ manager0/ modalias power/
beagle$ cd overlay0 beagle$ ls -F enabled input_size name position global_alpha manager output_size screen_width beagle$ cat position 0,0 beagle$ cat manager lcd beagle$ cat output_size 640,480
Investigate mplayer
Load Big Buck Bunny. This took some 3 minutes for me.
beagle$ cd exercises/gstreamer beagle$ git clone git://github.com/MarkAYoder/esc-media.git beagle$ cd esc-media
Now, start Big Buck Bunny and discover how it uses DSS
beagle$ mplayer BigBuckBunny_640x360.m4v beagle$ cd /sys/devices/platform/omapdss beagle$ ls beagle$ cd overlay0 beagle$ cat enabled
Repeat for overlay1 and 2, Which are being used? cd to it.
Play with scale and position
beagle$ cd /sys/devices/platform/omapdss/overlay2 beagle$ cat position beagle$ echo 100,100 > position beagle$ cat output_size beagle$ echo 320,400 > output_size
Try transparency
beagle$ echo 127 > global_alpha beagle$ cd ../manager0 beagle$ echo 1 > alpha_blending_enabled beagle$ echo 1 > trans_key_enabled beagle$ echo 65535 > trans_key_value
Caution: You may have to disable an overlay before changing some values.
beagle$ echo “0” > $ovl0/enabled
Assignment
Note what you have learned in a short memo.
Challenge
Can you get mplayer to appear in two windows?
Embedded Linux Class by Mark A. Yoder