[lcd4linux @ 2003-07-28 08:22:17 by reinelt]

several README's moved to web page

1 files changed, 0 insertions, 124 deletions

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-#
-# $Id: README.HD44780,v 1.3 2001/03/14 15:14:59 reinelt Exp $
-#
-
-This is the README file for the HD44780 display driver for lcd4linux
-
-This driver supports all display modules based on the Hitachi HD44780 chip.
-These displays are made by different manufactures, and come in various sizes.
-
-At least the following types are known to work:
-
-DataVision DV16244: 2 lines by 16 characters
-Nan Ya NLC 08x2x06: 2 lines by  8 characters 
-
-The displays are connected to the parallel board (see Wiring below), and are quite timing-critical.
-There's no way to delay a usermode program under Linux for e.g. 40 usec, so we have to do 
-busy-waiting. This is done in a delay loop, which had to be calibrated (see Configuration below).
-Since 0.98 there are two new delay loops, one based on the processor's TSC (Time Stamp Counter),
-one based on gettimeofday(). lcd4linux decides automatically which one to use (it prefers the
-TSC method, but falls back to gettimeofday() if neither the tsc flag nor the MHz value is set 
-in /proc/cpuinfo).
-
-The driver knows of two ways of controlling the parallel port: The (old, ugly and unportable) raw
-programming of ports, and the new, cool, great ppdev() style. You decide which one to use by 
-specifying either a hexadecimal value or a device file with the 'Port' entry in the config file.
-
-Note that the old port programming only works with standard ports (0x3f8, 2f8,...), but not 
-with PCI parallel port cards.
-
-ppdev requires kernel 2.4. The configure script detects if you have the required include files, 
-and deactivates ppdev if they are not there.
-
-You should use ppdev whenever possible. Raw port access may be dropped someday. 
-
-
-The driver supports vertical, horizontal and split bars (two independent bars in one line),
-all bar types can be used simultanously. As the displays only have 8 user-defined characters,
-the needed characters to display all the bars must be reduced to 8. This is done by replacing
-characters with similar ones. To reduce flicker, a character which is displayed at the moment,
-will not be redefined, even if it's not used in this run. Only if the character compaction 
-fails, this characters will be redefined, too.
-
-
-Configuration:
-
-The driver needs the following entries in lcd4linux.conf:
-
-Display: HD44780
-
-Port: either the hexadecimal address of the parallel port (e.g. 0x378)
-      or a ppdev device (e.g. /dev/parports/0)
-
-Size: [columns]x[rows] e.g. "16x2"
-
-
-#ifdef USE_OLD_UDELAY
-
-Delay: calibration of the delay loop, loops per microsecond
-       THIS IS NO LONGER NECESSARY!
-
-It is very important to use a correct delay value, otherwise you will get only junk on the
-display. lcd4linux has a switch '-d' where it helps you to find the correct value. Run
-'lcd4linux -d' several times on a otherwise idle machine, and use the maximum value. If you
-encounter display problems, increase this value. But don't take it too big, lcd4linux will get
-slow, and you're burning CPU cycles.
-
-The delay value is defined by your CPU model and clock frequency (it looks like it's your 
-'BogoMips' value divided by 2, because we use a similar delay loop than the kernel does). 
-Here are some examples:
-
-Pentium MMX, 133 MHz,  106 BogoMips:   54
-Pentium MMX, 166 MHz,  333 BogoMips:  166
-Celeron,     333 MHz,  333 BogoMips:  166
-Pentium III, 600 MHz,  600 BogoMips:  300
-AMD Athlon  1010 MHz, 2012 BogoMips:  505 
-
-#endif
-
-
-Wiring:
-
-There are two basic wiring modes for HD44780-Displays: a 4 bit mode (used by lcdproc) and a 
-8 bit mode (used by most other packages). At the moment we only support the 8 bit mode, but
-I'm working on the 4 bit mode, too.
-
-The main difference is that the 8 bit mode transfers one byte at a time, but the HD44780 needs 
-some control signals, so some of the parallel port control lines are used for this. The 4 bit
-mode uses only 4 bits for data (so a byte has to be transferred in two cycles), but you can use 
-the other 4 bits for the control signals.
-
-Normally a HD44780-based display have 14 or 16 pins, where pins 15 and 16 are used for backlight.
-Power (+5V) must be supplied via pins 1 and 2, be careful not to change polarity, you will 
-destroy your display! Pin 3 is used to control the contrast, you can either hardwire it to GND
-(pin 1) or place a potentiometer (10k-20k) between pins 1 and 2, and connect pin 3 to the slider.
-
-Note that the data bits are called DB0..DB7 on the display, but DB1..DB8 on the parallel port!
-
-Here comes the wiring diagram for the 8 bit mode:
-
---- Display ---        --- DB25 ---            --- comment ---
-Name        Pin        Pin     Name
-
-GND           1        18      GND             GND of power supply, too!
-+5V           2        -                       power supply only
-LCD drive     3        -                       see above
-RS            4        14      Auto Feed       register select, 0=data, 1=command
-R/W           5        18      GND             hardwired to 0, write data only
-Enable        6         1      Strobe          toggled when data is valid
-DB0           7         2      DB1             data bit 0
-DB1           8         3      DB2             data bit 1
-DB2           9         4      DB3             data bit 2
-DB3          10         5      DB4             data bit 3
-DB4          11         6      DB5             data bit 4
-DB5          12         7      DB6             data bit 5
-DB6          13         8      DB7             data bit 6
-DB7          14         9      DB8             data bit 7
-+5V          15         -                      power for backlight
-GND          16         -                      power for backlight
-                        10-13  not connected
-                        15-17  not connected
-                        19-25  not connected
-
-
-Wiring diagram for 4 bit mode: soon to come!