EBC Exercise 19 DSS2 and sysfs - Revision history

Yoder: /* Investigate mplayer */

2012-09-20T13:49:46Z

‎Investigate mplayer

Yoder: moved EBC Exercise 10a DSS2 and sysfs to EBC Exercise 19 DSS2 and sysfs

2012-07-17T19:31:00Z

moved EBC Exercise 10a DSS2 and sysfs to EBC Exercise 19 DSS2 and sysfs

Yoder: Added Header/Footer

2012-05-28T17:19:42Z

Added Header/Footer

Yoder: /* Assignment */

2012-01-13T13:59:11Z

‎Assignment

Yoder at 19:34, 6 January 2012

2012-01-06T19:34:06Z

Yoder: moved EBC Exercise 10 DSS2 and sysfs to EBC Exercise 10a DSS2 and sysfs

2012-01-06T17:35:21Z

moved EBC Exercise 10 DSS2 and sysfs to EBC Exercise 10a DSS2 and sysfs

Yoder: Initial page

2012-01-06T17:35:14Z

Initial page

New page

[[Category:ECE497]]

* DSS2 uses sysfs
* 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

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
# cat manager
lcd
# cat output_size
640,480

@@ Line 38: / Line 38: @@
 === Investigate mplayer ===
-Start BigBuckBunny and discover how it uses DSS
+Load Big Buck Bunny.  This took some 3 minutes for me.
   beagle$ '''cd /sys/devices/platform/omapdss'''
   beagle$ '''ls'''

@@ Line 1: / Line 1: @@
 [[Category:ECE497]]
 Here are some example DSS2 sysfs commands.  Play around and see what you can learn.
@@ Line 67: / Line 68: @@
 Can you get mplayer to appear in two windows?

← Older revision		Revision as of 13:59, 13 January 2012
Line 63:		Line 63:
	=== <span style="color:green">Assignment</span> ===		=== <span style="color:green">Assignment</span> ===
	<span style="color:green">Note what you have learned in a short memo.</span>		<span style="color:green">Note what you have learned in a short memo.</span>
		+
		+	==== Challenge ====
		+
		+	Can you get mplayer to appear in two windows?

@@ Line 1: / Line 1: @@
 [[Category:ECE497]]
-* DSS2 uses sysfs
+Here are some example DSS2 sysfs commands.  Play around and see what you can learn.
-* The framebuffers are in /sys/class/graphics/
   beagle$ '''ls -F /sys/class/graphics/'''
   fb0@  fb1@  fb2@  fbcon@
@@ Line 12: / Line 15: @@
   cursor          mode     overlays_rotate  rotate     stride       virtual_size
 The overlays, managers and displays are in '''/sys/devices/platform/omapdss/'''
   beagle$ '''cd /sys/devices/platform/omapdss/'''
@@ Line 24: / Line 28: @@
   enabled       input_size  name         position
   global_alpha  manager     output_size  screen_width
-  beagle$ cat position
+  beagle$ '''cat position'''
 ,0
-# cat manager
+ beagle$ '''cat manager'''
-lcd
+ lcd
-# cat output_size
+ beagle$ '''cat output_size'''
 ,480