Provided by: lcdproc_0.5.7-4_amd64
LCDd - LCDproc server daemon
LCDd [-hf] [-c config] [-d driver] [-i bool] [-a addr] [-p port] [-u user] [-w time] [-r level] [-s bool]
LCDd is the server part of LCDproc, a daemon which listens to a certain port (normally 13666) and displays information on an LCD display. It works with several types and sizes of displays. Most settings of LCDd are configured through its configuration file /etc/LCDd.conf, some of them can be overridden using command line options. Before running LCDd you should carefully read through that file and modify everything necessary according to your needs. Otherwise you might encounter LCDd not running properly on your system. To make full use of LCDd, a client such as lcdproc(1), lcdexec(1), or lcdvc is required.
Available options are: -h Display help screen -c config Use a configuration file other than /etc/LCDd.conf -d driver Specify a driver to use (output only to first), overriding the Driver parameter in the config file's [Server] section. -f Run in the foreground, overriding the Foreground parameter in the config file's [Server] section. The default, if not specified in the config file, is to daemonize LCDd as it is intended to operate in the background. -i bool Tell whether the to enable (1) or disable (0) showing the LCDproc server screen in n the screen rotation, overriding ServerScreen in the config file's [Server] section. -w waittime Time to pause at each screen (in seconds), overriding the WaitTime parameter in the config file's [Server] section. -a addr Bind to network address addr, overriding the Bind parameter in the config file's [Server] section. -p port Listen on port port for incoming connections, overriding the Port parameter in the config file's [Server] section. -u user Run as user user, overriding the User parameter in the config file's [Server] section. -s bool Output messages to syslog (1) or to stdout (0), overriding the ReportToSyslog parameter in the config file's [Server] section. -r level Set reporting level to level, overriding th ReportLevel parameter in the config file's [Server] section. SUPPORTED DRIVERS Currently supported display drivers include: bayrad BayRAD LCD modules by EMAC Inc. CFontz CrystalFontz CFA-632 and CFA-634 serial LCD displays CFontzPacket CrystalFontz CFA-533, CFA-631, CFA-633 and CFA-635 serial/USB LCD displays curses Standard video display using the (n)curses library CwLnx serial/USB displays by Cwlinux (http://www.cwlinux.com) ea65 VFD front panel display on Aopen XC Cube EA65 media barebone EyeboxOne LCD display on the EyeboxOne g15 LCD display on the Logitech G15 keyboard glcd generic driver for graphical LCDs with FreeType rendering support. This driver supports the following sub-drivers (a.k.a. connection types): glcd2usb Till Harbaum's open source/open hardware GLCD2USB (http://www.harbaum.org/till/glcd2usb/) picolcdgfx picoLCD 256x64 Sideshow graphic LCD (Mini-Box.com) png Write out screens as PNG images serdisplib Uses serdisplib (http://serdisplib.sourceforge.net/) for output t6963 Toshiba T6963 based LCD displays (graphic mode) glcdlib graphical LCDs supported by graphlcd-base glk Matrix Orbital GLK Graphic Displays hd44780 Hitachi HD44780 LCD displays. This driver supports the following sub-drivers (a.k.a. connection types): 4bit LCD 4bit-mode, connected to a PC parallel port 8bit LCD 8bit-mode, connected to a PC parallel port serialLpt LCD in 4bit-mode through a 4094 shift register winamp LCD in 8bit-mode using WinAmp-wiring, connected to a PC parallel port picanlcd LCD driven by a PIC-an-LCD chip/board by Dale Wheat, connected to a serial port lcdserializer LCD driven by a PIC16C54-based piggy-back board, connected to a serial port los-panel LCD driven by an Atmel AVR based board, connected to a serial port vdr-lcd ???, connected to a serial port vdr-wakeup VDR-Wake module by Frank Jepsen (http://www.jepsennet.de/vdr/) pertelian Pertelian X2040 module (http://pertelian.com/) lis2 LIS2 from VLSystem (http://www.vlsys.co.kr), connected to USB mplay MPlay Blast from VLSystem (http://www.vlsys.co.kr), connected to USB usblcd LCD device from Adams IT Services (http://www.usblcd.de/) bwctusb USB-to-HD44780 converter by BWCT (http://www.bwct.de) lcd2usb Till Harbaum's open source/open hardware LCD2USB (http://www.harbaum.org/till/lcd2usb/) usbtiny Devices based on Dick Streefland's USBtiny firmware uss720 USS-720 USB-to-IEEE 1284 Bridge (Belkin F5U002 USB Parallel Printer Adapters) usb4all Sprut's open source / open hardware USB-4-all (http://www.sprut.de/) ftdi USB connection via a FTDI FT2232D chip in bitbang mode i2c LCD in 4-bit mode driven by PCF8574(A) / PCA9554(A), connected via I2C bus piplate Adafruit RGB Positive 16x2 LCD+Keypad for Raspberry Pi spi LCD with KS0073 or equivalent in serial mode, connected via SPI bus pifacecad PiFace Control and Display for the Raspberry Pi (http://www.piface.org.uk/) ethlcd TCP connection using open source/open hardware ethlcd (http://manio.skyboo.net/ethlcd/) raspberrypi LCD driven by the GPIO pins of a Raspberry Pi i2500vfd 140x32 pixel VFD Display of the Intra2net Intranator 2500 appliance icp_a106 ICP A106 alarm/LCD board in 19" rack cases by ICP imon iMON IR/VFD modules in cases by Soundgraph/Ahanix/Silverstone/Uneed/Accent imonlcd iMON IR/LCD modules in cases by Soundgraph/Ahanix/Silverstone/Uneed/Accent/Antec irtrans IRTrans IR/VFD modules in cases by Ahanix (e.g. MCE303) and possibly others May require irserver (http://www.irtrans.de/en/download/linux.php) to be running for connectivity. IOWarrior Code Mercenaries IOWarrior irman IrMan infrared (input) joy Joystick driver (input) lb216 LB216 LCD displays lcdm001 kernelconcepts.de 20x4 serial LCD displays lcterm serial LCD terminal from Helmut Neumark Elektronik (http://www.neumark.de) lirc Infrared (input) lis L.I.S MCE 2005 20x2 VFD (http://vlsys.co.kr) MD8800 VFD displays in Medion MD8800 PCs mdm166a Futuba MDM166A displays ms6931 MSI-6931 displays in 1U rack servers by MSI mtc_s16209x MTC_S16209x LCD displays by Microtips Technology Inc MtxOrb Matrix Orbital displays (except Matrix Orbital GLK displays) mx5000 LCD display on the Logitech MX5000 keyboard NoritakeVFD Noritake VFD Device CU20045SCPB-T28A rawserial Dumps the entire framebuffer to the serial port at a configurable rate. picolcd Mini-box.com USB LCD (PicoLCD 20x4 & picoLCD 20x2) pyramid LCD displays from Pyramid (http://www.pyramid.de) sdeclcd Watchguard Firebox LCD display based on SDEC LMC-S2D20 (http://www.sdec.com.tw) sed1330 SED1330/SED1335 (aka S1D13300/S1D13305) based graphical displays sed1520 122x32 pixel graphic displays based on SED1520 controllers serialPOS Driver for Point Of Sale ("POS") devices using various protocols (currently AEDEX only) serialVFD Text VFDs of various manufacturers, see LCDproc user-documentation for further details. shuttleVFD Shuttle VFD (USB-based) sli Wirz SLI driver (unknown) stv5730 STV5730A on-screen display chip SureElec LCD devices from SURE electronics (http://www.sureelectronics.net) svga VGA monitors using svgalib t6963 Toshiba T6963 based LCD displays (text mode) text Standard "hard-copy" text display tyan LCD module in Tyan Barebone GS series ula200 ULA-200 device from ELV (http://www.elv.de) vlsys_m428 VFD/IR combination in case MonCaso 320 from Moneual xosd On Screen Display on X11 Multiple drivers can be used simultaneously; thus, for example, a Matrix Orbital display (MtxOrb driver) can be combined with an infrared driver (irmanin driver).
LCDd -d MtxOrb -d joy The invocation example above will start LCDd reading its configuration from the default configuration file /etc/LCDd.conf but overriding the drivers specified therein with the Matrix Orbital driver and the Joystick input driver.
LCDPROC CLIENT-SERVER PROTOCOL
There is a basic sequence: 1. Open a TCP connection to the LCDd server port (usually 13666). 2. Say "hello" 3. The server will return some information on the type of display available. 4. Define (and use) a new screen and its widgets. 5. Close the socket when done displaying data. CLIENT COMMANDS There are many commands for the client to send to the LCDd server: hello This starts a client-server session with the LCDd server; the server will return a data string detailing the type of display and its size. client_set -name name Set the client's name. screen_add #id Add a new screen to the display. screen_del #id Remove a screen from the display. screen_set #id [-name name ] [-wid width] [-hgt height] [-priority prio] [-duration int] [-timeout int] [-heartbeat mode] [-backlight mode] [-cursor mode] [-cursor_x xpos] [-cursor_y ypos] Initialize a screen, or reset its data. widget_add #screen #id type [-in #frame] Add a widget of type type to screen #screen. widget_del #screen #id Delete widget #id from screen #screen. widget_set #screen #id data Set the data used to define a particular widget #id on screen #screen. HEARTBEAT MODES Valid heartbeat mode values (for the screen_set command) are: on Display pulsing heart symbol. off No heartbeat display. open Use client's heartbeat setting. This is the default. BACKLIGHT MODES Valid heartbeat mode values (for the screen_set command) are: on Turn backlight on. off Turn backlight off toggle Turn backlight off when it is on and vice versa. open Use client's backlight setting. This is the default. blink Blinking backlight flash Flashing blacklight Priorities Valid priority settings (used in the screen_set command) are as follows: input The client is doing interactive input. alert The screen has an important message for the user. foreground an active client info Normal info screen, default priority. background The screen is only visible when no normal info screens exists. hidden The screen will never be visible. For compatibility with older versions of clients a mapping of numeric priority values is also supported: 1 - 64 foreground 65 - 192 normal 193 - (infinity) background An example of how to properly use priorities is as follows: Imagine you're making an mp3 player for lcdproc. When the song changes, it's nice to display the new name immediately. So, you could set your screen's priority to foreground, wait for the server to display (or ignore) your screen, then set the screen back to normal. This would cause the mp3 screen to show up as soon as the one on screen was finished, then return to normal priority afterward. Or, let's say your client monitors the health of hospital patients. If one of the patients has a heart attack, you could set the screen priority to alert, and it would be displayed immediately. It wouldn't even wait for the previous screen to finish. Also, the display would stay on screen most of the time until the user did something about it. WIDGET TYPES Widgets can be any of the following: string A text string to display (as is). hbar A horizontal bar graph. vbar A vertical bar graph. title A title displayed across the top of the display, within a banner. icon A graphic icon. scroller A scrolling text display, scrolling either horizontally or vertically. frame A container to contain other widgets, permitting them to be refered to as a single unit. A widget is put inside a frame by using the -in #id parameter, where #id refers to the id of the frame. num Displays a large decimal digit Widgets are drawn on the screen in the order they are created. SETTING WIDGET DATA In the widget_set command, the data argument depends on which widget is being set. Each widget takes a particular set of arguments which defines its form and behavior: string x y text Displays text at position (x,y). title text Uses text as title to display. hbar x y length Displays a horizontal bar starting at position (x,y) that is length pixels wide. vbar x y length Displays a vertical bar starting at position (x,y) that is length pixels high. icon x y name Displays the icon name at position (x,y). scroller left top right bottom direction speed text The text defined will scroll in the direction defined. Valid directions are h (horizontal) and v (vertical). The speed defines how many "movements" (or changes) will occur per frame. A positive number indicates frames per movement; a negative number indicates movements per frame. frame left top right bottom wid hgt dir speed Frames define a visible "box" on screen, from the (left, top) corner to the (right, bottom) corner. The actual data may be bigger, and is defined as wid (width) by hgt (height); if it is bigger, then the frame will scroll in the direction (dir) and speed defined. num x int Displays large decimal digit int at the horizontal position x, which is a normal character x coordinate on the display. The special value 10 for int displays a colon.
If LCDd seems not to work as expected, try to run it in the foreground with reporting level set to maximum and reporting to stderr. This can be achieved without changes to the config file by using the command line: LCDd -f -r 5 -s 0
/etc/LCDd.conf, LCDd's default configuration file
lcdproc-config(5), lcdproc(1), lcdexec(1)
Many people have contributed to LCDd. See the CREDITS file for more details. All questions should be sent to the lcdproc mailing list. The mailing list, and the newest version of LCDproc, should be available from here: http://www.lcdproc.org/
The lcdproc package is released as "WorksForMe-Ware". In other words, it is free, kinda neat, and we don't guarantee that it will do anything in particular on any machine except the ones it was developed on. It is technically released under the GNU GPL license (you should have received the file, "COPYING", with LCDproc) (also, look on http://www.fsf.org/ for more information), so you can distribute and use it for free -- but you must make the source code freely available to anyone who wants it. For any sort of real legal information, read the GNU GPL (GNU General Public License). It's worth reading.