Added software PWM module into wiringPi - library code

and an example.

examples/Makefile

@@ -35,11 +35,11 @@ LIBS    = -lwiringPi
 # Should not alter anything below this line
 ###############################################################################
 
-SRC	=	test1.c test2.c speed.c lcd.c wfi.c piface.c gertboard.c nes.c delayTest.c
+SRC	=	test1.c test2.c speed.c lcd.c wfi.c piface.c gertboard.c nes.c delayTest.c softPwm.c
 
-OBJ	=	test1.o test2.o speed.o lcd.o wfi.o piface.o gertboard.o nes.o delayTest.o
+OBJ	=	test1.o test2.o speed.o lcd.o wfi.o piface.o gertboard.o nes.o delayTest.o softPwm.o
 
-all:		test1 test2 speed lcd wfi piface gertboard nes
+all:		test1 test2 speed lcd wfi piface gertboard nes softPwm
 
 test1:	test1.o
 	@echo [link]
@@ -73,6 +73,10 @@ nes:	nes.o
 	@echo [link]
 	$(CC) -o $@ nes.o $(LDFLAGS) $(LIBS) -lm
 
+softPwm:	softPwm.o
+	@echo [link]
+	$(CC) -o $@ softPwm.o $(LDFLAGS) $(LIBS) -lm -lpthread
+
 
 delayTest:	delayTest.o
 	@echo [link]
@@ -84,7 +88,7 @@ delayTest:	delayTest.o
 	@$(CC) -c $(CFLAGS) $< -o $@
 
 clean:
-	rm -f $(OBJ) *~ core tags test1 test2 speed lcd wfi piface gertboard nes delayTest
+	rm -f $(OBJ) *~ core tags test1 test2 speed lcd wfi piface gertboard nes delayTest softPwm
 
 tags:	$(SRC)
 	@echo [ctags]

examples/softPwm.c

@@ -0,0 +1,44 @@
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include <wiringPi.h>
+#include <softPwm.h>
+
+#define RANGE		100
+#define	NUM_LEDS	 12
+
+int ledMap [NUM_LEDS] = { 0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13 } ;
+
+int values [NUM_LEDS] = { 0, 17, 32, 50, 67, 85, 100, 85, 67, 50, 32, 17 } ;
+
+int main ()
+{
+  int i, j ;
+
+  if (wiringPiSetup () == -1)
+  {
+    fprintf (stdout, "oops: %s\n", strerror (errno)) ;
+    return 1 ;
+  }
+
+  for (i = 0 ; i < NUM_LEDS ; ++i)
+  {
+    softPwmCreate (ledMap [i], 0, RANGE) ;
+    printf ("%3d, %3d, %3d\n", i, ledMap [i], values [i]) ;
+  }
+
+  for (;;)
+  {
+    for (i = 0 ; i < NUM_LEDS ; ++i)
+      softPwmWrite (ledMap [i], values [i]) ;
+
+    delay (50) ;
+
+    i = values [0] ;
+    for (j = 0 ; j < NUM_LEDS - 1 ; ++j)
+      values [j] = values [j + 1] ;
+    values [NUM_LEDS - 1] = i ;
+  }
+}