New LCD library plus -v option for gpio binary

examples/Makefile

@@ -35,11 +35,11 @@ LIBS    = -lwiringPi
 # Should not alter anything below this line
 ###############################################################################
 
-SRC	=	test1.c test2.c speed.c
+SRC	=	test1.c test2.c speed.c lcd.c
 
-OBJ	=	test1.o test2.o speed.o
+OBJ	=	test1.o test2.o speed.o lcd.o
 
-all:		test1 test2 speed
+all:		test1 test2 speed lcd
 
 test1:	test1.o
 	@echo [link]
@@ -52,14 +52,18 @@ test2:	test2.o
 speed:	speed.o
 	@echo [link]
 	$(CC) -o $@ speed.o $(LDFLAGS) $(LIBS)
-	
+
+lcd:	lcd.o
+	@echo [link]
+	$(CC) -o $@ lcd.o $(LDFLAGS) $(LIBS)
+
 
 .c.o:
 	@echo [CC] $<
 	@$(CC) -c $(CFLAGS) $< -o $@
 
 clean:
-	rm -f $(OBJ) *~ core tags test1 test2 speed
+	rm -f $(OBJ) *~ core tags test1 test2 speed lcd
 
 tags:	$(SRC)
 	@echo [ctags]

examples/lcd.c

@@ -0,0 +1,129 @@
+/*
+ * lcd.c:
+ *	Text-based LCD driver.
+ *	This is designed to drive the parallel interface LCD drivers
+ *	based in the Hitachi HD44780U controller and compatables.
+ *
+ * Copyright (c) 2012 Gordon Henderson.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+
+#include <wiringPi.h>
+#include <lcd.h>
+
+int main (void)
+{
+  int i, j ;
+  int fd1, fd2 ; 
+
+  char message1 [256] ;
+  char message2 [256] ;
+  char buf1 [30] ;
+  char buf2 [30] ;
+
+  struct tm *t ;
+  time_t tim ;
+
+  printf ("Raspberry Pi LCD test program\n") ;
+
+  if (wiringPiSetup () == -1)
+    exit (1) ;
+
+  fd1 = lcdInit (4, 20, 4, 8,  9, 4,5,6,7,0,0,0,0) ;
+  fd2 = lcdInit (2, 16, 4, 8, 10, 4,5,6,7,0,0,0,0) ;
+
+//fd1 = lcdInit (4, 20, 8, 8,  9, 0,1,2,3,4,5,6,7) ;
+//fd2 = lcdInit (2, 16, 8, 8, 10, 0,1,2,3,4,5,6,7) ;
+
+  if (fd1 == -1)
+  {
+    printf ("lcdInit 1 failed\n") ;
+    return 1 ;
+  }
+
+  if (fd2 == -1)
+  {
+    printf ("lcdInit 2 failed\n") ;
+    return 1 ;
+  }
+
+  sleep (1) ;
+
+  lcdPosition (fd1, 0, 0) ; lcdPuts (fd1, " Gordon Henderson") ;
+  lcdPosition (fd1, 0, 1) ; lcdPuts (fd1, "  --------------") ;
+/*
+  lcdPosition (fd1, 0, 2) ; lcdPuts (fd1, "   00:00:00") ;
+  lcdPosition (fd1, 0, 3) ; lcdPuts (fd1, "   DD:MM:YY") ;
+*/
+
+  lcdPosition (fd2, 0, 0) ; lcdPuts (fd2, "Gordon Henderson") ;
+  lcdPosition (fd2, 0, 1) ; lcdPuts (fd2, "----------------") ;
+
+  sleep (2) ;
+
+  sprintf (message1, "%s", "                  http://projects.drogon.net/                    ") ;
+  sprintf (message2, "%s", "                This is a long message to go into the smaller display just for a demonstration of what we can do.                ") ;
+
+  for (;;)
+  {
+    i = 0 ;
+    j = 0 ;
+    for (;;)
+    {
+      strncpy (buf1, &message1 [i], 20) ;
+      buf1 [20] = 0 ;
+      lcdPosition (fd1, 0, 1) ;
+      lcdPuts (fd1, buf1) ;
+      ++i ;
+      if (i == strlen (message1) - 20)
+	i = 0 ;
+
+      strncpy (buf2, &message2 [j], 16) ;
+      buf2 [16] = 0 ;
+      lcdPosition (fd2, 0, 1) ;
+      lcdPuts (fd2, buf2) ;
+      ++j ;
+      if (j == strlen (message2) - 16)
+	j = 0 ;
+
+      tim = time (NULL) ;
+      t = localtime (&tim) ;
+
+      sprintf (buf1, "%02d:%02d:%02d", t->tm_hour, t->tm_min, t->tm_sec) ;
+      lcdPosition (fd1, 5, 2) ;
+      lcdPuts (fd1, buf1) ;
+
+      sprintf (buf1, "%02d/%02d/%02d", t->tm_mday, t->tm_mon + 1, t->tm_year+1900) ;
+      lcdPosition (fd1, 4, 3) ;
+      lcdPuts (fd1, buf1) ;
+
+      delay (250) ;
+    }
+  }
+
+  return 0 ;
+}