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LCD(3)                       One-Wire File System                       LCD(3)


NAME

       LCD - LCD controller


SYNOPSIS

       1-wire LCD controller by Louis Swart

       FF [.]XXXXXXXXXXXX[XX][/[ backlight | counters.[0-3|ALL] |
       cumulative.[0-3|ALL] | branch.[0-1|ALL] | data | gpio.[0-3|ALL] | LCDon
       | line16.[0-3|ALL] | line20.[0-3|ALL] | line40.[0|1|ALL] | memory |
       register | screen16 | screen20 | screen40 | version |

       See the file man3/standard_mini.3so.

       ]]


FAMILY CODE

       FF


SPECIAL PROPERTIES

   backlight
       write-only,yes-no
       Write a non-zero value to turn on the LCD backlight. Write zero to turn
       off.

   counters[0-3,ALL]
       read-only,unsigned integer
       Read the number of times the gpio has been externally changed. If wired
       to a push switch, will count twice per button press. The LCD firmware
       resets all the counter when any one is read. Use the ALL extension to
       read them all, simultaneously, or use the cumulative property instead.
       ALL is an aggregate of the properties, comma separated. Read
       atomically.

   cumulative[0-3,ALL]
       read-write,unsigned integer
       Cumulative sum of the counters property. To reset, write a zero. The
       cumulative counter can have any value written, which allows
       preservation of counts accross program restarts if the value at program
       termination is stored.
       Reading cumulative will reset the counters property. All the cumulative
       counters will be updated so that no counts will be lost. Reads of
       counters can be interspersed without losing cumulative accuracy.
       Note: cumulative requires the caching system be compiled into libow.
       ALL is an aggregate of the properties, comma separated.

   data
       read-write,unsigned int
       Contents of the LCD data byte (see datasheet). Not usually needed.

   LCDon
       write-only,yes-no
       Write a non-zero value to turn on the LCD screen (also clears). Write a
       zero to turn off.

   line16[0-3,ALL] line20[0-3,ALL] line40[0-1,ALL]
       write-only,ascii
       Write text to the LCD screen. Assumes 16/20/40 char width. (Cannot be
       determined from controller).
       ALL is an aggregate of the properties, comma separated. Each is set in
       turn.

   memory
       read-write,binary
       112 bytes of on-board memory.

   register
       read-write,unsigned int
       Contents of the LCD register (see datasheet). Not usually needed.

   screen16 screen20 screen40
       write-only,ascii
       Write text to the LCD screen. Assumes 16/20/40 char width. (Cannot be
       determined from controller).

   version
       read-only,ascii
       Self-reported LCD controller version. 16 bytes.


STANDARD PROPERTIES

       See the file man3/standard.3so.


ALARMS

       None implemented.


DESCRIPTION

       See the file man3/description.3so.

   LCD
       The LCD (3) controller is a microprocessor driven device that simulates
       the operation of 1-wire devices. It's creator has arbitrarily chosen
       the family code FF. The controller requires external power. Full
       details are available from the designer.
       The main draw of the LCD controller is as any easy way to provide
       output to users.


ADDRESSING

       See the file man3/addressing.3so.


DATASHEET

       Available from http://www.louisswart.co.za/1-Wire_index.html


SEE ALSO

       See the file man3/seealso.3so.


AVAILABILITY

       http://www.owfs.org


AUTHOR

       Paul Alfille (paul.alfille@gmail.com)

OWFS Manpage                         2003                               LCD(3)

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