ppokorny
e7316389e8
serial port side. Also fixed problems with ioperm on the parallel port side. Added --waittime option to the server to specify how long the server should leave a screen up before changing to the next screen.
118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
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* "Winamp" 8-bit driver module for Hitachi HD44780 based LCD displays.
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* The LCD is operated in it's 8 bit-mode to be connected to a single
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* PC parallel port.
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*
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* Copyright (c) 1999 Andrew McMeikan <andrewm@engineer.com>
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* modular driver 1999-2000 Benjamin Tse <blt@Comports.com>
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*
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* Modified July 2000 by Charles Steinkuehler for enhanced
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* performance and reduced CPU usage
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* - provided required setup time for RS valid to E high
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* - 1 uS call to uPause removed as it is unnecessary
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*
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* The connections are:
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* printer port LCD
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* D0 (2) D0 (7)
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* D1 (3) D1 (8)
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* D2 (4) D2 (9)
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* D3 (5) D3 (10)
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* D4 (6) D4 (11)
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* D5 (7) D5 (12)
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* D6 (8) D6 (13)
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* D7 (9) D7 (14)
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* nSTRB (1) EN (6)
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* nLF (14) nRW (5) (EN3 6 - LCD 3) (optional)
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* INIT (16) RS (4)
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* nSEL (17) EN2 (6 - LCD 2) (optional)
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*
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* Created modular driver Dec 1999, Benjamin Tse <blt@Comports.com>
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*
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* This file is released under the GNU General Public License. Refer to the
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* COPYING file distributed with this package.
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*/
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#include "hd44780-winamp.h"
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#include "port.h"
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#include "shared/str.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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void lcdwinamp_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch);
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#define EN1 STRB
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#define EN2 SEL
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#define EN3 LF
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#define RS INIT
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static unsigned char EnMask[] = { EN1, EN2, EN3 };
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static int EnMaskSize = sizeof (EnMask) / sizeof (unsigned char);
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static unsigned int lptPort;
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static int extIF = 0; // non-zero if extended interface
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// initialise the driver
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int
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hd_init_winamp (HD44780_functions * hd44780_functions, lcd_logical_driver * driver, char *args, unsigned int port)
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{
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// TODO: remove magic numbers below
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char *argv[64];
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int argc;
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int i;
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hd44780_functions->senddata = lcdwinamp_HD44780_senddata;
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lptPort = port;
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// parse command-line arguments
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argc = get_args (argv, args, 64);
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for (i = 0; i < argc; ++i)
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if (strcmp (argv[i], "-e") == 0 || strcmp (argv[i], "--extended") == 0)
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extIF = 1;
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if (port_access (lptPort + 2) || port_access (lptPort)) {
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fprintf (stderr, "HD44780_init: failed (%s)\n", strerror (errno));
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return -1;
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}
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common_init (IF_8bit);
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return 0;
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}
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// lcdwinamp_HD44780_senddata
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void
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lcdwinamp_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch)
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{
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unsigned char dispID = 0, portControl;
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if (flags == RS_DATA)
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portControl = RS;
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else
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portControl = 0;
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if (displayID == 0)
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dispID = EnMask[0] | EnMask[1] | ((extIF) ? EnMask[2] : 0);
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else
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dispID = EnMask[displayID - 1];
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// 40 nS setup time for RS valid to EN high, so set RS
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port_out (lptPort + 2, portControl ^ OUTMASK);
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// then set EN high
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port_out (lptPort + 2, (dispID | portControl) ^ OUTMASK);
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// Output the actual data
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port_out (lptPort, ch);
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// 80 nS setup from valid data to EN low will be met without any delay
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// unless you are running a REALLY FAST ISA bus (like 75 MHZ!)
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// 230 nS minimum E high time provided by ISA bus delays as well...
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// Set EN low and we're done...
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port_out (lptPort + 2, portControl ^ OUTMASK);
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// 10 nS data hold time provided by the length of ISA write for EN
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}
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