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GraphLCD driver library
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The SED1520 driver
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Description
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-----------
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The SED1520 driver supports LC displays that use the Epson SED1520
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controller, connected to the parallel port of your PC.
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Wirings
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-------
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The SED1520 driver supports the following connection on a parallel
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port:
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printerport LCD other
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----------- ---------- ----------
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GND (18) GND (01) GND (Ground)
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Vdd (02) +5V
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Vo (03) (LCD Contrast In -4V)
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nSEL (17) R/S (04) (Register Select)
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R/W (05) GND (Read/Write)
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nSTRB (01) EN1 (06) (Enable Left)
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D0 (02) D0 (07) (DataBit0)
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D1 (03) D1 (08) (DataBit1)
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D2 (04) D2 (09) (DataBit2)
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D3 (05) D3 (10) (DataBit3)
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D4 (06) D4 (11) (DataBit4)
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D5 (07) D5 (12) (DataBit5)
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D6 (08) D6 (13) (DataBit6)
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D7 (09) D7 (14) (DataBit7)
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INIT (16) EN2 (15) (Enable Right)
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RESET (16) +5V (Controller Reset)
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LED+ (17) +4V/150mA (Backlight with 6,4Ohm Resistor to +5V)
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nAUTO (14) LED- (18) GND (Backlight GND [via BS170])
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See also http://www.usblcd.de/lcdproc/sed1520-dip.php4 ...
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Note: The pin numbering may vary with other displays.
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Configuration Parameters
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------------------------
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The SED1520 driver supports the following parameters in config file:
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Device
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Instead of using the direct output via port address (see Port), you
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can use the parport device (/dev/parportX). The advantage over the
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direct output via port address is that this works for non-root users
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also. But it's a little bit slower. The modules ppdev.o, parport.o
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and parport_pc.o must be loaded or compiled into the kernel.
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Port
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Sets the port address of the parallel port. If this parameter is not
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given, 0x378 is used. To use this direct output, the program that
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uses the driver library has to be started with user 'root'.
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Width
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Sets the horizontal size of the display. If this parameter is not
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given, a default value of 120 pixels is used.
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Height
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Sets the vertical size of the display. If this parameter is not
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given, a default value of 32 pixels is used.
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UpsideDown
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Rotates the display output by 180 degrees. This might be useful, if
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the LCD is mounted upside-down.
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Possible values: 'yes', 'no'
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Default value: 'no'
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Invert
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Inverts the display.
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Possible values: 'yes', 'no'
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Default value: 'no'
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AdjustTiming
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To get a timing that is as accurate as possible, the drivers measure
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the time for port commands (see: benchmark in syslog). You might
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decrease or increase the time to wait after port commands with this
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parameter. Normally, there is no need to change this parameter.
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Possible values: -50 <= x <= 50
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Default value: 0
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RefreshDisplay
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Normally, most of the drivers do not update the whole display, but
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only the areas that have changed since last update. So it might be,
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that some faulty pixels would stay a longer time. To avoid this, the
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plugin makes a complete refresh from time to time. This parameter
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defines how often a complete refresh will be done.
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e.g.: A value of 5 means, that the plugin will make a complete
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refresh on every 5th update.
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A value of 0 completely disables complete refreshs.
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Possible values: 0 <= x <= 50
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Default value: 5
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