144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/*
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* "PIC-an-LCD" serial driver module for Hitachi HD44780 based LCD displays.
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*
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* Copyright (c) 1997, Matthias Prinke <m.prinke@trashcan.mcnet.de>
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* 1998, Richard Rognlie <rrognlie@gamerz.net>
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* 1999, Ethan Dicks
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* 1999-2000, Benjamin Tse <blt@Comports.com>
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* 2001, Rene Wagner
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* 2001-2002, Joris Robijn <joris@robijn.net>
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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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* See the PIC-an-LCD documentation for data on how it should be connected
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* to the computer.
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* http://dalewheat.com/products/PIC-an-LCD/index.html
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*
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*/
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#include "hd44780-picanlcd.h"
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#include "hd44780-low.h"
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#include "report.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <errno.h>
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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// Generally, any function that accesses the LCD control lines needs to be
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// implemented separately for each HW design. This is typically (but not
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// restricted to):
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// HD44780_senddata
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// HD44780_readkeypad
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void picanlcd_HD44780_senddata (PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch);
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void picanlcd_HD44780_backlight (PrivateData *p, unsigned char state);
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unsigned char picanlcd_HD44780_scankeypad (PrivateData *p);
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// PIC-an-LCD ASCII commands
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//#define PICANLCD_HOME '\001'
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//#define PICANLCD_CLR '\014'
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#define PICANLCD_LED '\025'
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#define PICANLCD_LCDI '\021'
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#define PICANLCD_LCDD '\022'
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#define DEFAULT_DEVICE "/dev/lcd"
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// initialise the driver
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int
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hd_init_picanlcd (Driver *drvthis)
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{
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PrivateData *p = (PrivateData*) drvthis->private_data;
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struct termios portset;
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char device[256] = DEFAULT_DEVICE;
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/* READ CONFIG FILE */
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/* Get serial device to use */
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strncpy(device, drvthis->config_get_string ( drvthis->name , "device" , 0 , DEFAULT_DEVICE),sizeof(device));
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device[sizeof(device)-1]=0;
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report (RPT_INFO,"HD44780: PIC-an-LCD: Using device: %s", device);
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// Set up io port correctly, and open it...
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p->fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
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if (p->fd == -1) {
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report(RPT_ERR, "HD44780: PIC-an-LCD: could not open device %s (%s)\n", device, strerror(errno));
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return -1;
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}
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/* Get serial device parameters */
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tcgetattr(p->fd, &portset);
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/* We use RAW mode */
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#ifdef HAVE_CFMAKERAW
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/* The easy way */
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cfmakeraw( &portset );
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#else
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/* The hard way */
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portset.c_iflag &= ~( IGNBRK | BRKINT | PARMRK | ISTRIP
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| INLCR | IGNCR | ICRNL | IXON );
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portset.c_oflag &= ~OPOST;
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portset.c_lflag &= ~( ECHO | ECHONL | ICANON | ISIG | IEXTEN );
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portset.c_cflag &= ~( CSIZE | PARENB | CRTSCTS );
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portset.c_cflag |= CS8 | CREAD | CLOCAL ;
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#endif
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/* Set port speed to 9600 baud */
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cfsetospeed(&portset, B9600);
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/* Set TCSANOW mode of serial device */
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tcsetattr(p->fd, TCSANOW, &portset);
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p->hd44780_functions->senddata = picanlcd_HD44780_senddata;
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p->hd44780_functions->backlight = picanlcd_HD44780_backlight;
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p->hd44780_functions->scankeypad = picanlcd_HD44780_scankeypad;
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common_init (p, IF_8BIT);
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return 0;
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}
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// picanlcd_HD44780_senddata
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void
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picanlcd_HD44780_senddata (PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch)
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{
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static const char data_byte = PICANLCD_LCDD;
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static const char instr_byte = PICANLCD_LCDI;
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if (flags == RS_DATA) {
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// Do we need a DATA indicator byte ?
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if( ch < 32 ) {
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write( p->fd, &data_byte, 1 );
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}
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write( p->fd, &ch, 1 );
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}
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else {
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write( p->fd, &instr_byte, 1 );
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write( p->fd, &ch, 1 );
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}
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}
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void
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picanlcd_HD44780_backlight (PrivateData *p, unsigned char state)
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{
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/* Anyone wants to implement this ? */
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}
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unsigned char
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picanlcd_HD44780_scankeypad (PrivateData *p)
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{
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return 0;
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}
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