Home Explore Help
Register Sign In
dingyu
/
CooCenter-System-kernel
1
0
Fork 0
Files Issues 0 Pull Requests 0 Wiki
Branch: master
Branches Tags
CooCenter-Sy...
/
Documentation
/
fb
/
metronomefb.txt

metronomefb.txt 2.0 KB
Permalink History Raw

123456789101112131415161718192021222324252627282930313233343536 
  1. 			Metronomefb
    2. 

  2. 			-----------
    3. 

  3. Maintained by Jaya Kumar <jayakumar.lkml.gmail.com>
    4. 

  4. Last revised: Mar 10, 2008
    5. 

  5. 

  6. Metronomefb is a driver for the Metronome display controller. The controller
    7. 

  7. is from E-Ink Corporation. It is intended to be used to drive the E-Ink
    8. 

  8. Vizplex display media. E-Ink hosts some details of this controller and the
    9. 

  9. display media here http://www.e-ink.com/products/matrix/metronome.html .
    10. 

  10. 

  11. Metronome is interfaced to the host CPU through the AMLCD interface. The
    12. 

  12. host CPU generates the control information and the image in a framebuffer
    13. 

  13. which is then delivered to the AMLCD interface by a host specific method.
    14. 

  14. The display and error status are each pulled through individual GPIOs.
    15. 

  15. 

  16. Metronomefb is platform independent and depends on a board specific driver
    17. 

  17. to do all physical IO work. Currently, an example is implemented for the
    18. 

  18. PXA board used in the AM-200 EPD devkit. This example is am200epd.c
    19. 

  19. 

  20. Metronomefb requires waveform information which is delivered via the AMLCD
    21. 

  21. interface to the metronome controller. The waveform information is expected to
    22. 

  22. be delivered from userspace via the firmware class interface. The waveform file
    23. 

  23. can be compressed as long as your udev or hotplug script is aware of the need
    24. 

  24. to uncompress it before delivering it. metronomefb will ask for metronome.wbf
    25. 

  25. which would typically go into /lib/firmware/metronome.wbf depending on your
    26. 

  26. udev/hotplug setup. I have only tested with a single waveform file which was
    27. 

  27. originally labeled 23P01201_60_WT0107_MTC. I do not know what it stands for.
    28. 

  28. Caution should be exercised when manipulating the waveform as there may be
    29. 

  29. a possibility that it could have some permanent effects on the display media.
    30. 

  30. I neither have access to nor know exactly what the waveform does in terms of
    31. 

  31. the physical media.
    32. 

  32. 

  33. Metronomefb uses the deferred IO interface so that it can provide a memory
    34. 

  34. mappable frame buffer. It has been tested with tinyx (Xfbdev). It is known
    35. 

  35. to work at this time with xeyes, xclock, xloadimage, xpdf.
    36. 

  36.