Added in the SN3218 LED controller IC - as used in the PiGlow

so write a little test program with it too.
Updated gpio to use the sn3218 too.

wiringPi/Makefile

@@ -54,6 +54,7 @@ SRC	=	wiringPi.c						\
 		pcf8574.c pcf8591.c					\
 		mcp3002.c mcp3004.c mcp4802.c mcp3422.c			\
 		max31855.c max5322.c					\
+		sn3218.c						\
 		drc.c
 
 OBJ	=	$(SRC:.c=.o)
@@ -112,6 +113,7 @@ install-headers:
 	@install -m 0644 sr595.h		$(DESTDIR)$(PREFIX)/include
 	@install -m 0644 pcf8574.h		$(DESTDIR)$(PREFIX)/include
 	@install -m 0644 pcf8591.h		$(DESTDIR)$(PREFIX)/include
+	@install -m 0644 sn3218.h		$(DESTDIR)$(PREFIX)/include
 
 .PHONEY:	install
 install:	$(DYNAMIC) install-headers
@@ -151,6 +153,7 @@ uninstall:
 	@rm -f $(DESTDIR)$(PREFIX)/include/sr595.h
 	@rm -f $(DESTDIR)$(PREFIX)/include/pcf8574.h
 	@rm -f $(DESTDIR)$(PREFIX)/include/pcf8591.h
+	@rm -f $(DESTDIR)$(PREFIX)/include/sn3218.h
 	@rm -f $(DESTDIR)$(PREFIX)/lib/libwiringPi.*
 	@ldconfig
 
@@ -184,4 +187,5 @@ mcp4802.o: wiringPi.h wiringPiSPI.h mcp4802.h
 mcp3422.o: wiringPi.h wiringPiI2C.h mcp3422.h
 max31855.o: wiringPi.h wiringPiSPI.h max31855.h
 max5322.o: wiringPi.h wiringPiSPI.h max5322.h
+sn3218.o: wiringPi.h wiringPiI2C.h sn3218.h
 drc.o: wiringPi.h wiringSerial.h drc.h

wiringPi/sn3218.c

@@ -0,0 +1,75 @@
+/*
+ * sn3218.c:
+ *	Extend wiringPi with the SN3218 I2C LEd Driver
+ *	Copyright (c) 2012-2013 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 Lesser 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 Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <wiringPi.h>
+#include <wiringPiI2C.h>
+
+#include "sn3218.h"
+
+/*
+ * myAnalogWrite:
+ *	Write analog value on the given pin
+ *********************************************************************************
+ */
+
+static void myAnalogWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+  int fd   = node->fd ;
+  int chan = 0x01 + (pin - node->pinBase) ;
+  
+  wiringPiI2CWriteReg8 (fd, chan, value & 0xFF) ;	// Value
+  wiringPiI2CWriteReg8 (fd, 0x16, 0x00) ;		// Update
+}
+
+/*
+ * sn3218Setup:
+ *	Create a new wiringPi device node for an sn3218 on the Pi's
+ *	SPI interface.
+ *********************************************************************************
+ */
+
+int sn3218Setup (const int pinBase)
+{
+  int fd ;
+  struct wiringPiNodeStruct *node ;
+
+  if ((fd = wiringPiI2CSetup (0x54)) < 0)
+    return fd ;
+
+// Setup the chip - initialise all 18 LEDs to off
+
+//wiringPiI2CWriteReg8 (fd, 0x17, 0) ;		// Reset
+  wiringPiI2CWriteReg8 (fd, 0x00, 1) ;		// Not Shutdown
+  wiringPiI2CWriteReg8 (fd, 0x13, 0x3F) ;	// Enable LEDs  0- 5
+  wiringPiI2CWriteReg8 (fd, 0x14, 0x3F) ;	// Enable LEDs  6-11
+  wiringPiI2CWriteReg8 (fd, 0x15, 0x3F) ;	// Enable LEDs 12-17
+  wiringPiI2CWriteReg8 (fd, 0x16, 0x00) ;	// Update
+  
+  node = wiringPiNewNode (pinBase, 18) ;
+
+  node->fd          = fd ;
+  node->analogWrite = myAnalogWrite ;
+
+  return 0 ;
+}

wiringPi/sn3218.h

@@ -0,0 +1,33 @@
+/*
+ * sn3218.c:
+ *	Extend wiringPi with the SN3218 I2C LED driver board.
+ *	Copyright (c) 2012-2013 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 Lesser 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 Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int sn3218Setup (int pinBase) ;
+
+#ifdef __cplusplus
+}
+#endif