alps lsu7s1011a

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• this page deals with connecting an alps lsu7s1011a to a parallel port and drive it using serdisplib
• i'm not responsible for the content of external web pages
• external web pages will generally open in separate browser windows or tabs
• english is not my native language. please keep that in mind (corrections of english grammar and formulations are very welcome!)
• email: mrwastl at users.sourceforge.net

attention

quick fix

in the source file serdisp_specific_sed153x.c simply replace in array-definition serdisp_sed153x_wiresignals[]:

  ,{SDCT_PP, "DC",         0,   'D',    17 }

through

  ,{SDCT_PP, "DC",         0,   'D',    16 }

thanks to daniel badberg for helping me find this bug

alps lsu7s1011a:

description

some images

alps lsu7s1011a and lc-display module kit	alps lsu7s1011a and lc-display module kit, display visible
test image generated by testserdisp
output generated by graphlcd

connecting an alps lsu7s1011a to the parallel port:

intro

addressing

anomaly of alps lsu7s1011a

sed1530 supports a max. resolution of 132x65, but alps lsu7s1011a only uses 96x32. unlike one might expect, the first column is not 0, but 18. so every column address has to be shifted by 18. another anomaly to take care of: row 0 to row 15 are swapped.

pages vs. rows:

another item to take care of: the display is organised in colums and pages: 8 pixel-rows are combined to a so called page.
as only whole bytes can be transferred to the display, a single pixel cannot be changed without knowing its 7 'neighbour' pixels.
so a display buffer was introduced in the library. pixel changes are all done in this buffer and in a separate step only changed pages are transferred (using an optimising algorithm) to the display. the display buffer is also responsible for the translation of 'real' x/y-addresses to corresponding display addresses.

passing options through serdisp_init():

intro

    examples:
    
      serdisp_init(sdcd, "LSU7S1011A", "INVERT=YES");
      serdisp_init(sdcd, "ALPS", "ROTATE=90");
    

options

  0 .. no delay
  1 .. one call of gettimeofday()
 >1 .. delay at least x nanoseconds
     

ranges, aliases

pre-defined wiring definitions

display signals

annotations

• Optrex 323 and Alps LSU7S1011 share the same wiring (one exception: ALPS-wiring is without backlight)
• signal BACKLIGHT might be used for enabling a background light added separately
• identifier ALPS is a synonym for LSU7S1011A

links:

history: