LCD Server for LRP |
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conundrum
尊榮會員 發表:893 回覆:1272 積分:643 註冊:2004-01-06 發送簡訊給我 |
http://lrp.steinkuehler.net/Packages/LCDProc.htm LCD Server for LRP DOWNLOAD TECHNICAL DETAILS NOTES PHOTOS I have bought some cheap LCD's from Marlin P Jones and gotten them to work with LCDProc. I got a couple of Sharp LM16A21 16x2 (p/n 12536-OP) displays for $3.95 each, and a Samsung UC20401 20x4 (p/n 9207-OP) display for $15.95. I modified the 4/8 bit HD44780 driver provided with latest LCDProc (the 'bleeding edge' sourceforge CVS code...not 0.4-pre9) to reduce CPU usage by using the nanosleep delay function. See below for details on how I hooked the LCD to the parallel port. The connections use the somewhat standard 'winamp' pinout, so if you multiboot your machine and run winamp, you should be able to use your LCD to view songs & stuff too. The LCDd server includes the standard drivers as well, so you can use any of the normal displays (Crystal Fontz, Matrix Oribital, or even text or curses based displays w/o an LCD!). -------------------------------------------------------------------------------- DOWNLOAD
LCDd
LCD Server for LRP
lcdproc
Default client
hd44780.c
Source code for 8 bit LPT interface driver
hd44780-winamp.c
Source code for 'winamp' pinout low level driver
winamplcd.pdf Wiring diagram for the 'winamp' LCD pinout
TECHNICAL DETAILS
Supported LCD controllers
MFGR
P/N
Tested
Notes:
Hitachi
HD44780
X
Tested with Sharp LM16A21 Display (16x2)
Samsung
KS0066U
X
Tested with Samsung UC-20401 Display (20x4)
Sanyo
LC7985NA
Untested
Epson
SED1278
Untested
OKI
MSM6222
Untested
LCD connections to LPT
PDF wiring diagram
LCD Function
LCD Pin
LPT Pin
LPT Function
Ground
1
18-25
Ground
VCC (+5V)
2
-
See Notes
VO (Contrast voltage)
3
-
See Notes
RS
4
16
INIT
R/W
5
18-25
Ground See Notes
E
6
1
Strobe
DB0
7
2
DB0
DB1
8
3
DB1
DB2
9
4
DB2
DB3
10
5
DB3
DB4
11
6
DB4
DB5
12
7
DB5
DB6
13
8
DB6
DB7
14
9
DB7
See Notes
15
-
See Notes
See Notes
16
-
See Notes
Connections for additional LCDs All connections the same as above except pin 6
LCD # LCD Function
LCD Pin
LPT Pin
LPT Function
2 E
6
17
Select
3 E
6
14
AutoFeed
NOTES
LCD Pins 1 and 2 should be connected to a 5V power source. Typically this is done by hacking a drive power extension or 'Y' cable. The connection for LCD Pin 3 (VO) is somewhat display specific...typically you need to connect a variable resistor to this pin. LCD Pin 5 (R/W) is tied to ground, forcing the LCD into write mode all the time. This is to prevent bus contention with the LPT port drivers on systems with standard parallel ports. Even if you have a bi-directional LPT port, the LPT and LCD drivers will both be driving from power-on until LCDProc is run (which could be a LONG TIME!). You can run up to 3 LCD's by tying a different LPT pin to LCD Pin 6 (E). Some LCD's have pins 15 & 16, which are for the backlight. The connections to these pins is somewhat display specific, and varies based on the type of backlight. Displays without backlights typically only have 14 pins. In the wiring harness below, I put a pin-header on the LCD and wired the LPT port to a header so I can swap LCD's with ease. It would probably be easier to solder the wires directly to the LCD if you don't plan on trying out several different displays. If you look carefully at my wiring harness, you will see I didn't connect all the ground pins from the LPT ribbon cable together. You should probably do as I say, not as I do, and wire all the ground lines together. If you REALLY look carefully at the wiring harness, you will note that it uses my old pinout (I'll try to take a new picture soon). I strongly suggest you use the fairly standard WinAmp connection detailed above...plus you can do cool things with the LCD from windows using WinAmp! PHOTOS
LCDProc running on my Samsung 20x4 display
A picture of the wiring harness I made
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