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HD44780 keypad update.

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(second try)
This commit is contained in:
robijn
2001-10-05 19:39:02 +00:00
parent 709e53495e
commit de84f06cc7
1 changed files with 75 additions and 29 deletions
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server/drivers/hd44780-4bit.c
+75 -29
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@@ -1,16 +1,17 @@
/*
* 4-bit driver module for Hitachi HD44780 based LCD displays.
* The LCD is operated in it's 4 bit-mode to be connected to a single
* 8 bit-port.
* 8 bit-port.
*
* Copyright (c) 2000, 1999, 1995 Benjamin Tse <blt@Comports.com>
* 2001 Joris Robijn <joris@robijn.net>
* 1999 Andrew McMeikan <andrewm@engineer.com>
* 1998 Richard Rognlie <rrognlie@gamerz.net>
* 1997 Matthias Prinke <m.prinke@trashcan.mcnet.de>
*
* The connections are:
* printer port LCD
* D0 (2) D4 (11)
* printer port LCD
* D0 (2) D4 (11)
* D1 (3) D5 (12)
* D2 (4) D6 (13)
* D3 (5) D7 (14)
@@ -22,8 +23,27 @@
* Extended interface (including LCD3 above)
* STR (1) EN4
* LF (14) EN5
* INIT (16) EN6
* SEL (17) EN7
* INIT (16) EN6
* SEL (17) EN7
*
* 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
* nSTRB (1) Y6
* nLF (14) Y7
* INIT (16) Y8
* nSEL (17) Y9
* nACK (10) X0
* BUSY (11) X1
* PAPEREND (12 X2
* SELIN (13) X3
* nFAULT (15) X4
*
* Added support for up to 7 LCDs Jan 2000, Benjamin Tse
* Created modular driver Dec 1999, Benjamin Tse <blt@Comports.com>
@@ -37,8 +57,9 @@
*/
#include "hd44780-4bit.h"
#include "port.h"
#include "hd44780.h"
#include "port.h"
#include "shared/str.h"
#include <stdio.h>
#include <string.h>
@@ -46,21 +67,23 @@
// Generally, any function that accesses the LCD control lines needs to be
// implemented separately for each HW design. This is typically just
// HD44780_senddata
// HD44780_senddata and HD44780_readkeypad
void lcdstat_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch);
unsigned char lcdstat_HD44780_readkeypad (unsigned int YData);
#define RS 0x10
#define RW 0x20
#define EN1 0x40
#define EN2 0x80
#define EN3 0x20
#define RS 0x10
#define RW 0x20
#define EN1 0x40
#define EN2 0x80
#define EN3 0x20
static unsigned char EnMask[] = { EN1, EN2, EN3, STRB, LF, INIT, SEL };
static int EnMaskSize = sizeof (EnMask) / sizeof (unsigned char);
static int extIF = 0; // non-zero if extended interface
static unsigned int lptPort;
static int extIF = 0; // non-zero if extended interface
static char stuckinputs = 0; // if an input line is stuck, it will be ignored
// initialisation function
int
@@ -72,9 +95,14 @@ hd_init_4bit (HD44780_functions * hd44780_functions, lcd_logical_driver * driver
int i;
int displayID = EN1 | EN2;
// Reserve the port registers
lptPort = port;
port_access(lptPort);
port_access(lptPort+1);
port_access(lptPort+2);
hd44780_functions->senddata = lcdstat_HD44780_senddata;
hd44780_functions->readkeypad = lcdstat_HD44780_readkeypad;
// parse command-line arguments
argc = get_args (argv, args, 64);
@@ -82,10 +110,6 @@ hd_init_4bit (HD44780_functions * hd44780_functions, lcd_logical_driver * driver
for (i = 0; i < argc; ++i) {
if (strcmp (argv[i], "-e") == 0 || strcmp (argv[i], "--extended") == 0) {
extIF = 1;
if (port_access (port + 2)) {
fprintf (stderr, "HD44780_init: failed (%s)\n", strerror (errno));
return -1;
}
}
}
@@ -132,7 +156,13 @@ hd_init_4bit (HD44780_functions * hd44780_functions, lcd_logical_driver * driver
port_out (lptPort + 2, 0 ^ OUTMASK);
hd44780_functions->uPause (40);
common_init (IF_4bit);
common_init ();
if (keypad) {
// Remember which input lines are stuck
stuckinputs = lcdstat_HD44780_readkeypad (0);
}
return 0;
}
@@ -140,47 +170,63 @@ hd_init_4bit (HD44780_functions * hd44780_functions, lcd_logical_driver * driver
void
lcdstat_HD44780_senddata (unsigned char displayID, unsigned char iflags, unsigned char ch)
{
unsigned char dispID = 0, flags = 0;
unsigned char h = (ch >> 4) & 0x0f; // high and low nibbles
unsigned char enableLines = 0, flags = 0;
unsigned char h = (ch >> 4) & 0x0f; // high and low nibbles
unsigned char l = ch & 0x0f;
if (iflags == RS_INSTR)
flags = 0;
else //if (iflags == RS_DATA)
else //if (iflags == RS_DATA)
flags = RS;
if (displayID <= 3) {
if (displayID == 0)
dispID = EnMask[0] | EnMask[1] | EnMask[2];
enableLines = EnMask[0] | EnMask[1] | EnMask[2];
else
dispID = EnMask[displayID - 1];
enableLines = EnMask[displayID - 1];
port_out (lptPort, flags | h);
hd44780_functions->uPause (2);
port_out (lptPort, dispID | flags | h);
port_out (lptPort, enableLines | flags | h);
hd44780_functions->uPause (4);
port_out (lptPort, flags | h);
port_out (lptPort, dispID | flags | l);
port_out (lptPort, enableLines | flags | l);
hd44780_functions->uPause (4);
port_out (lptPort, flags | l);
}
if (extIF && (displayID == 0 || displayID >= 4)) {
if (displayID == 0)
dispID = EnMask[3] | EnMask[4] | EnMask[5] | EnMask[6];
enableLines = EnMask[3] | EnMask[4] | EnMask[5] | EnMask[6];
else
dispID = EnMask[(displayID - 1) % EnMaskSize];
enableLines = EnMask[(displayID - 1) % EnMaskSize];
port_out (lptPort, flags | h);
hd44780_functions->uPause (2);
port_out (lptPort + 2, dispID ^ OUTMASK);
port_out (lptPort + 2, enableLines ^ OUTMASK);
hd44780_functions->uPause (4);
port_out (lptPort + 2, 0 ^ OUTMASK);
port_out (lptPort, flags | l);
port_out (lptPort + 2, dispID ^ OUTMASK);
port_out (lptPort + 2, enableLines ^ OUTMASK);
hd44780_functions->uPause (4);
port_out (lptPort + 2, 0 ^ OUTMASK);
}
}
unsigned char lcdstat_HD44780_readkeypad (unsigned int YData)
{
unsigned char readval;
// 10 bits output or 6 bits if >=3 displays
// Convert the positive logic to the negative logic on the LPT port
port_out (lptPort, ~YData & 0x003F );
if (!extIF) {
port_out (lptPort + 2, ( ((~YData & 0x03C0) << 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;
}