sharp m078cka
generic lh155 support

disclaimer / info:

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sharp m078cka-a3qkla0057:

nota bene

only 8080-mode supported for now!

description

sharp m078cka displays are controlled by a sharp lh155 controller.
specifications
resolution 240 x 64
colours monochrome
controller Sharp LH155
adjustable contrast no
backlight no
dimensions module: 88.5 x 77.4 mm, display area: 72 x 32 mm (datasheet)
name in serdisplib "SHARP240"       (example: serdisp_init(sdcd, "SHARP240", ""); )

some images

[sharp240 testserdisp] [sharp240 graphlcd]
test image generated by testserdisp output generated by graphlcd
[sharp240 multidisplay]  
floyd steinberg dithered and straightened image generated by multidisplay  
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connecting a sharp m078cka display display to the parallel port:

intro

serdisplib supports the wiring descripted in the PDF distributed by pollin and only 8080-mode for now. but customisable wiring is possible anyways ...

pre-defined wiring

  • D0 to D7 are wired to pin 2 to 9
  • /WR  .. pin  1 (nSTRB)
 RS  .. pin 14 (nAUTO)
/RES .. pin 16 (INIT)
/CS  .. pin 17 (nSELIN)
  • M86 needs to be connected to GND
  • /RD needs to be connected to VDD
     
  • use 1 kOhm protection resistors or similar for D0 - D7, /WR, RS, /RES, /CS, and /RD to protect parallel port and display controller (protection resistor between /RD and VDD)!
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using the driver for generic lh155-based displays:

intro

the driver should be able to support generic lh155-based displays, though only sharp m078cja displays have been tested so far.

description

  • only 8080-mode is supported so far
  • wiring needs to be set through customisable wiring
  • width and height need to be set using options
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passing options through serdisp_init():

intro

using the third parameter of serdisp_init(), driver specific options and custom wiring can be set.
common information about passing options and customisable wiring can be found in a separate document. 
    examples:
    
      serdisp_init(sdcd, "SHARP240", "WIDTH=240;HEIGHT=128;INVERT=YES");
      serdisp_init(sdcd, "LH155", "W=240;H=64;WIRING=Original");

options

identifiershortremarkdefault
WIDTHWwidth of display240
HEIGHTHheight of display64
ROTATEROTrotate display (1 == 180 degrees)0
INVERTINVinvert display0
DELAY delay after each write/read operation.
  0 .. no delay
  1 .. one call of gettimeofday()
 >1 .. delay at least x nanoseconds
0
WIRINGWIREpre-defined or customisable wiring0

ranges, aliases

identifierrangealiases
WIDTH<=240; a multiple of 8 
HEIGHT<=64 
ROTATE0, 1, 90, 180, 270YES=180, NO=0, TRUE=180, FALSE=0
INVERT0, 1YES=1, NO=0, TRUE=1, FALSE=0
DELAY>= 0NONE=0

pre-defined wiring definitions

identifiernumeric idprotocoldescription
Original0PAROriginal wiring

display signals

identifierdescriptionmandatory
D0 - D78 bit wide data bus*
RSdata (low) or command (high)*
CSchip select input, active low*
WRwrite signal, active low*
RDread signal, active low 
RESETreset signal, active low; optional if wired to a hardware reset circuit 
BACKLIGHTbacklight, optional 
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links:

controller Sharp LH155
technical reference local copy of Sharp LH155 technical reference (english) lh155.pdf
display Sharp M078CKA-A3QKLA0057
short reference short description, wiring; local copy (german) Sharp M078CKA-A3QKLA0057.pdf
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history:

2007-03-22 fixed erraneous range informations
2007-03-18 first release
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design by wolfgang astleitner, (C) 1998 - 2007