Added PIC-an-LCD HD44780 subdriver.

Currently untested.
2002-02-07 22:10:04 +00:00
parent 901833b353
commit 15b226483a
6 changed files with 148 additions and 8 deletions
@@ -0,0 +1,128 @@
+/*
+ * "PIC-an-LCD" serial driver module for Hitachi HD44780 based LCD displays.
+ *
+ * Copyright (c)  1997, Matthias Prinke <m.prinke@trashcan.mcnet.de>
+ *		  1998, Richard Rognlie <rrognlie@gamerz.net>
+ * 		  1999, Ethan Dicks
+ *		  1999-2000, Benjamin Tse <blt@Comports.com>
+ *		  2001, Rene Wagner
+ *		  2001-2002, Joris Robijn <joris@robijn.net>
+ *
+ * This file is released under the GNU General Public License. Refer to the
+ * COPYING file distributed with this package.
+ *
+ * See the PIC-an-LCD documentation for data on how it should be connected
+ * to the computer.
+ * http://dalewheat.com/products/PIC-an-LCD/index.html
+ *
+ */
+
+#include "hd44780-picanlcd.h"
+#include "hd44780.h"
+
+#include "shared/str.h"
+#include "report.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <termios.h>
+
+#include <errno.h>
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+// Generally, any function that accesses the LCD control lines needs to be
+// implemented separately for each HW design. This is typically (but not
+// restricted to):
+// HD44780_senddata
+// HD44780_readkeypad
+
+void picanlcd_HD44780_senddata (PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch);
+
+// PIC-an-LCD ASCII commands
+//#define PICANLCD_HOME '\001'
+//#define PICANLCD_CLR  '\014'
+#define PICANLCD_LED  '\025'
+#define PICANLCD_LCDI '\021'
+#define PICANLCD_LCDD '\022'
+
+#define DEFAULT_DEVICE		"/dev/lcd"
+
+// initialise the driver
+int
+hd_init_picanlcd (Driver *drvthis)
+{
+	PrivateData *p = (PrivateData*) drvthis->private_data;
+
+	struct termios portset;
+	char device[256] = DEFAULT_DEVICE;
+
+	/* READ CONFIG FILE */
+
+	/* Get serial device to use */
+	strncpy(device, drvthis->config_get_string ( drvthis->name , "device" , 0 , DEFAULT_DEVICE),sizeof(device));
+	device[sizeof(device)-1]=0;
+	report (RPT_INFO,"HD44780: PC-an-LCD: Using device: %s", device);
+
+	// Set up io port correctly, and open it...
+	p->fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
+	if (p->fd == -1) {
+		report(RPT_ERR, "HD44780: PC-an-LCD: could not open device %s (%s)\n", device, strerror(errno));
+		return -1;
+	}
+
+	/* Get serial device parameters */
+	tcgetattr(p->fd, &portset);
+
+	/* We use RAW mode */
+#ifdef HAVE_CFMAKERAW
+	/* The easy way */
+	cfmakeraw( &portset );
+#else
+	/* The hard way */
+	portset.c_iflag &= ~( IGNBRK | BRKINT | PARMRK | ISTRIP
+	                      | INLCR | IGNCR | ICRNL | IXON );
+	portset.c_oflag &= ~OPOST;
+	portset.c_lflag &= ~( ECHO | ECHONL | ICANON | ISIG | IEXTEN );
+	portset.c_cflag &= ~( CSIZE | PARENB | CRTSCTS );
+	portset.c_cflag |= CS8 | CREAD | CLOCAL ;
+#endif
+	/* Set port speed to 9600 baud */
+	cfsetospeed(&portset, B9600);
+
+	/* Set TCSANOW mode of serial device */
+	tcsetattr(p->fd, TCSANOW, &portset);
+
+	p->hd44780_functions->senddata = picanlcd_HD44780_senddata;
+
+	common_init (p);
+
+	return 0;
+}
+
+// picanlcd_HD44780_senddata
+void
+picanlcd_HD44780_senddata (PrivateData *p, unsigned char displayID, unsigned char flags, unsigned char ch)
+{
+	static const char data_byte = PICANLCD_LCDD;
+	static const char instr_byte = PICANLCD_LCDI;
+
+	if (flags == RS_DATA) {
+		// Do we need a DATA indicator byte ?
+		if( ch < 32 ) {
+			write( p->fd, &data_byte, 1 );
+		}
+		write( p->fd, &ch, 1 );
+	}
+	else {
+		write( p->fd, &instr_byte, 1 );
+		write( p->fd, &ch, 1 );
+	}
+}