Portable and maintable HD44780 driver files.

2000-02-21 11:24:09 +00:00
parent 6cefefd52c
commit e481f1311e
12 changed files with 978 additions and 0 deletions
@@ -0,0 +1,109 @@
+/*
+ * "Winamp" 8-bit driver module for Hitachi HD44780 based LCD displays.
+ * The LCD is operated in it's 8 bit-mode to be connected to a single
+ * PC parallel port.
+ *
+ * Copyright (c)  1999 Andrew McMeikan <andrewm@engineer.com>
+ *		  modular driver 1999-2000 Benjamin Tse <blt@Comports.com> 
+ *
+ * The connections are:
+ * printer port	  LCD
+ * D0 (2)      	  D0 (7)
+ * D1 (3)	  D1 (8)
+ * D2 (4)	  D2 (9)
+ * D3 (5)	  D3 (10)
+ * D4 (6)	  D4 (11)
+ * D5 (7)	  D5 (12)
+ * D6 (8)	  D6 (13)
+ * D7 (9)	  D7 (14)
+ * nSTRB (1)      EN (6)
+ * nLF   (14)     nRW (5) (EN3 6 - LCD 3) (optional)
+ * INIT  (16)     RS (4)
+ * nSEL  (17)     EN2 (6 - LCD 2) (optional)
+ *
+ * Created modular driver Dec 1999, Benjamin Tse <blt@Comports.com>
+ *
+ * This file is released under the GNU General Public License. Refer to the
+ * COPYING file distributed with this package.
+ */
+
+#include "hd44780-winamp.h"
+#include "port.h"
+
+#include "../../shared/str.h"
+#include <sys/perm.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+void lcdwinamp_HD44780_senddata(unsigned char displayID, 
+				unsigned char flags, 
+				unsigned char ch);
+
+#define EN1     STRB
+#define EN2	SEL
+#define EN3	LF
+#define RS	INIT
+
+static unsigned char EnMask[] = { EN1, EN2, EN3 };
+static int EnMaskSize = sizeof(EnMask) / sizeof(unsigned char);
+
+static unsigned int lptPort;
+static int extIF = 0;		// non-zero if extended interface
+
+
+// initialise the driver
+int hd_init_winamp(HD44780_functions *hd44780_functions, 
+		   lcd_logical_driver *driver, 
+		   char *args, 
+		   unsigned int port)
+{
+   // TODO: remove magic numbers below
+  char *argv[64];
+  int argc;
+  int i;
+  
+  hd44780_functions->senddata = lcdwinamp_HD44780_senddata;
+  lptPort = port;
+
+  // parse command-line arguments
+  argc = get_args(argv, args, 64);
+
+  for (i = 0; i < argc; ++i)
+    if (strcmp(argv[i], "-e") == 0 ||
+	strcmp(argv[i], "--extended") == 0)
+      extIF = 1;
+
+  if ((ioperm(lptPort + 2, 1, 255)) == -1) {
+    fprintf(stderr, "HD44780_init: failed (%s)\n", strerror(errno)); 
+    return -1;
+  }
+
+  common_init(IF_8bit);
+  return 0;
+}
+
+
+// lcdwinamp_HD44780_senddata
+void lcdwinamp_HD44780_senddata(unsigned char displayID, 
+				unsigned char flags, 
+				unsigned char ch)
+{
+  unsigned char dispID = 0, portControl;
+
+  if (flags == RS_DATA)
+    portControl = RS;
+  else
+    portControl = 0;
+
+  if (displayID == 0)
+    dispID = EnMask[0] | EnMask [1] | ((extIF) ? EnMask[2] : 0);
+  else
+    dispID = EnMask[displayID - 1];
+	
+  port_out(lptPort, ch);
+  port_out(lptPort + 2, (dispID | portControl) ^ OUTMASK);
+  hd44780_functions->uPause(1);
+  port_out(lptPort + 2, portControl ^ OUTMASK);
+}
+