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HD44780 keypad update. (second try)

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This commit is contained in:
robijn
2001-10-05 19:43:50 +00:00
parent de84f06cc7
commit 4829ed367f
2 changed files with 67 additions and 15 deletions
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server/drivers/hd44780-ext8bit.c
+63 -12
View File
@@ -4,10 +4,11 @@
* PC parallel port.
*
* Copyright (c) 1999, 1995 Benjamin Tse <blt@Comports.com>
* 2001 Joris Robijn <joris@robijn.net>
*
* The connections are:
* printer port LCD
* D0 (2) D0 (7)
* printer port LCD
* D0 (2) D0 (7)
* D1 (3) D1 (8)
* D2 (4) D2 (9)
* D3 (5) D3 (10)
@@ -20,6 +21,25 @@
* nLF (14) RW (5) (LCD2 - 6) (optional - pull all LCD RW low)
* INIT (16) EN (6)
*
* Keypad connection (optional):
* Some diodes and resistors are needed, see further documentation.
* printer port keypad
* D0 (2) Y0
* D1 (3) Y1
* D2 (4) Y2
* D3 (5) Y3
* D4 (6) Y4
* D5 (7) Y5
* D6 (7) Y6
* D7 (7) Y7
* nSTRB (1) Y8
* nSEL (17) Y9
* nACK (10) X0
* BUSY (11) X1
* PAPEREND (12) X2
* SELIN (13) X3
* nFAULT (15) X4
*
* Created modular driver Dec 1999, Benjamin Tse <blt@Comports.com>
*
* Based on the code in the lcdtime package which uses the LCD
@@ -30,8 +50,9 @@
*/
#include "hd44780-ext8bit.h"
#include "port.h"
#include "hd44780.h"
#include "port.h"
#include "lcd_sem.h"
#include <stdio.h>
#include <string.h>
@@ -41,11 +62,13 @@
// implemented separately for each HW design. This is typically (but not
// restricted to):
// HD44780_senddata
// HD44780_readkeypad
void lcdtime_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch);
unsigned char lcdtime_HD44780_readkeypad (unsigned int YData);
#define nRS nSTRB
#define nRW nLF
#define nRS nSTRB
#define nRW nLF
#define EN1 INIT
#define METER_OFF nSEL
@@ -53,24 +76,36 @@ void lcdtime_HD44780_senddata (unsigned char displayID, unsigned char flags, uns
#define CTRL (nRW | METER_OFF | nRS)
#define CHAR (nRW | METER_OFF)
static int extIF = 0; // non-zero if extended interface
static unsigned int lptPort;
static char stuckinputs = 0; // if an input line is stuck, it will be ignored
static int semid;
// initialise the driver
int
hd_init_ext8bit (HD44780_functions * hd44780_functions, lcd_logical_driver * driver, char *args, unsigned int port)
{
lptPort = port;
semid = sem_get ();
// Reserve the port registers
lptPort = port;
port_access(lptPort);
port_access(lptPort+1);
port_access(lptPort+2);
hd44780_functions->senddata = lcdtime_HD44780_senddata;
hd44780_functions->readkeypad = lcdtime_HD44780_readkeypad;
if (port_access (port + 2)) {
fprintf (stderr, "HD44780_init: failed (%s)\n", strerror (errno));
return -1;
}
// setup the lcd in 8 bit mode
hd44780_functions->senddata (0, RS_INSTR, FUNCSET | IF_8BIT);
hd44780_functions->uPause (4100);
hd44780_functions->senddata (0, RS_INSTR, FUNCSET | IF_8BIT);
hd44780_functions->uPause (100);
hd44780_functions->senddata (0, RS_INSTR, FUNCSET | IF_8BIT | TWOLINE | SMALLCHAR);
hd44780_functions->uPause (40);
common_init (IF_8bit);
common_init ();
return 0;
}
@@ -82,7 +117,7 @@ lcdtime_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned
if (displayID == 1)
dispID |= EN1;
else //if (displayID == 0)
else //if (displayID == 0)
dispID |= EN1;
if (flags == RS_DATA)
@@ -98,3 +133,19 @@ lcdtime_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned
port_out (lptPort + 2, portControl);
sem_signal (semid);
}
unsigned char lcdtime_HD44780_readkeypad (unsigned int YData)
{
unsigned char readval;
// 10 bits output
// Convert the positive logic to the negative logic on the LPT port
port_out (lptPort, ~YData & 0x00FF );
if (!extIF) {
port_out (lptPort + 2, ( ((~YData & 0x0100) >> 8) | ((~YData & 0x0200) >> 6)) ^ OUTMASK);
}
// And convert it back.
readval = ~ port_in (lptPort + 1) ^ INMASK;
return ( (readval >> 4 & 0x03) | (readval >> 5 & 0x04) | (readval >> 3 & 0x08) | (readval << 1 & 0x10) ) & ~stuckinputs;
}
server/drivers/hd44780.h
+4 -3
View File
@@ -1,4 +1,4 @@
/*
/*
* Base driver module for Hitachi HD44780 based LCD displays. This is
* a modular driver that allows support for alternative HD44780
* designs to be added in a flexible and maintainable manner.
@@ -9,13 +9,14 @@
* Copyright (c) 1999, 1995 Benjamin Tse <blt@Comports.com>
* 1999 Andrew McMeikan <andrewm@engineer.com>
* 1998 Richard Rognlie <rrognlie@gamerz.net>
* 1997 Matthias Prinke <m.prinke@trashcan.mcnet.de>
*
1997 Matthias Prinke <m.prinke@trashcan.mcnet.de>
*/
#ifndef HD44780_H
#define HD44780_H
#include "port.h"
extern char keypad; // non-zero if the keypad code is activated
int HD44780_init (struct lcd_logical_driver *driver, char *args);
/* The following methods can all be hidden. They are used through function ptrs