Gordon Henderson 12 роки тому
коміт
2c13e6148d
21 змінених файлів з 3578 додано та 0 видалено
  1. 7 0
      README
  2. 71 0
      examples/Makefile
  3. 103 0
      examples/speed.c
  4. BIN
      examples/test1
  5. 91 0
      examples/test1.c
  6. BIN
      examples/test2
  7. 41 0
      examples/test2.c
  8. 674 0
      gpio/COPYING
  9. 73 0
      gpio/Makefile
  10. 145 0
      gpio/gpio.1
  11. 418 0
      gpio/gpio.c
  12. 23 0
      gpio/test.sh
  13. 674 0
      wiringPi/COPYING
  14. 83 0
      wiringPi/Makefile
  15. 7 0
      wiringPi/README
  16. 204 0
      wiringPi/serial.c
  17. 41 0
      wiringPi/serial.h
  18. 729 0
      wiringPi/wiringPi.c
  19. 69 0
      wiringPi/wiringPi.h
  20. 84 0
      wiringPi/wiringShift.c
  21. 41 0
      wiringPi/wiringShift.h

+ 7 - 0
README

@@ -0,0 +1,7 @@
+
+WiringPi: An implementation of most of the Arduino Wiring
+	functions for the Raspberry Pi
+
+Full details at:
+	https://projects.drogon.net/raspberry-pi/wiringpi/
+

+ 71 - 0
examples/Makefile

@@ -0,0 +1,71 @@
+#
+# Makefile:
+#	wiringPi - Wiring Compatable library for the Raspberry Pi
+#	https://projects.drogon.net/wiring-pi
+#
+#	Copyright (c) 2012 Gordon Henderson
+#################################################################################
+# This file is part of wiringPi:
+#	Wiring Compatable library for the Raspberry Pi
+#
+#    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/>.
+#################################################################################
+
+
+#DEBUG	= -g -O0
+DEBUG	= -O3
+CC	= gcc
+INCLUDE	= -I/usr/local/include
+CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe
+
+LDFLAGS	= -L/usr/local/lib
+LIBS    = -lwiringPi
+
+# Should not alter anything below this line
+###############################################################################
+
+SRC	=	test1.c test2.c speed.c
+
+OBJ	=	test1.o test2.o speed.o
+
+all:		test1 test2 speed
+
+test1:	test1.o
+	@echo [link]
+	$(CC) -o $@ test1.o $(LDFLAGS) $(LIBS)
+	
+test2:	test2.o
+	@echo [link]
+	$(CC) -o $@ test2.o $(LDFLAGS) $(LIBS)
+
+speed:	speed.o
+	@echo [link]
+	$(CC) -o $@ speed.o $(LDFLAGS) $(LIBS)
+	
+
+.c.o:
+	@echo [CC] $<
+	@$(CC) -c $(CFLAGS) $< -o $@
+
+clean:
+	rm -f $(OBJ) *~ core tags test1 test2 speed
+
+tags:	$(SRC)
+	@echo [ctags]
+	@ctags $(SRC)
+
+depend:
+	makedepend -Y $(SRC)
+
+# DO NOT DELETE

+ 103 - 0
examples/speed.c

@@ -0,0 +1,103 @@
+
+/*
+ * speed.c:
+ *	Simple program to measure the speed of the various GPIO
+ *	access mechanisms.
+ */
+
+#include <wiringPi.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#define	FAST_COUNT	10000000
+#define	SLOW_COUNT	 1000000
+
+
+int main (void)
+{
+  int i ;
+  uint32_t start, end, count, sum, perSec ;
+
+  printf ("Raspberry Pi wiringPi speed test program\n") ;
+
+// Start the standard way
+
+  if (wiringPiSetup () == -1)
+    exit (1) ;
+
+  printf ("Native wiringPi method: (%8d iterations)\n", FAST_COUNT) ;
+
+  pinMode (0, OUTPUT) ;
+
+  sum = 0 ;
+  for (i = 0 ; i < 3 ; ++i)
+  {
+    printf ("  Pass: %d: ", i) ;
+    fflush (stdout) ;
+
+    start = millis () ;
+    for (count = 0 ; count < FAST_COUNT ; ++count)
+      digitalWrite (0, 1) ;
+    end = millis () ;
+    printf (" %8dmS\n", end - start) ;
+    sum += (end - start) ;
+  }
+  digitalWrite (0, 0) ;
+  printf ("   Average: %8dmS", sum / 3) ;
+  perSec = (int)(double)FAST_COUNT / (double)((double)sum / 3.0) * 1000.0 ;
+  printf (": %6d/sec\n", perSec) ;
+
+
+  printf ("Native GPIO method: (%8d iterations)\n", FAST_COUNT) ;
+
+  wiringPiGpioMode (WPI_MODE_GPIO) ;
+
+  pinMode (17, OUTPUT) ;
+
+  sum = 0 ;
+  for (i = 0 ; i < 3 ; ++i)
+  {
+    printf ("  Pass: %d: ", i) ;
+    fflush (stdout) ;
+
+    start = millis () ;
+    for (count = 0 ; count < 10000000 ; ++count)
+      digitalWrite (17, 1) ;
+    end = millis () ;
+    printf (" %8dmS\n", end - start) ;
+    sum += (end - start) ;
+  }
+  digitalWrite (17, 0) ;
+  printf ("   Average: %8dmS", sum / 3) ;
+  perSec = (int)(double)FAST_COUNT / (double)((double)sum / 3.0) * 1000.0 ;
+  printf (": %6d/sec\n", perSec) ;
+
+
+// Switch to SYS mode:
+
+  wiringPiSetupSys () ;
+
+  printf ("/sys/class/gpio method: (%8d iterations)\n", SLOW_COUNT) ;
+
+  sum = 0 ;
+  for (i = 0 ; i < 3 ; ++i)
+  {
+    printf ("  Pass: %d: ", i) ;
+    fflush (stdout) ;
+
+    start = millis () ;
+    for (count = 0 ; count < SLOW_COUNT ; ++count)
+      digitalWrite (17, 1) ;
+    end = millis () ;
+    printf (" %8dmS\n", end - start) ;
+    sum += (end - start) ;
+  }
+  digitalWrite (17, 0) ;
+  printf ("   Average: %8dmS", sum / 3) ;
+  perSec = (int)(double)SLOW_COUNT / (double)((double)sum / 3.0) * 1000.0 ;
+  printf (": %6d/sec\n", perSec) ;
+
+  return 0 ;
+}

BIN
examples/test1


+ 91 - 0
examples/test1.c

@@ -0,0 +1,91 @@
+
+/*
+ * test1.c:
+ *	Simple test program to test the wiringPi functions
+ */
+
+#include <wiringPi.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+
+// Simple sequencer data
+//	Triplets of LED, On/Off and delay
+
+uint8_t data [] =
+{
+            0, 1, 1,
+            1, 1, 1,
+  0, 0, 0,  2, 1, 1,
+  1, 0, 0,  3, 1, 1,
+  2, 0, 0,  4, 1, 1,
+  3, 0, 0,  5, 1, 1,
+  4, 0, 0,  6, 1, 1,
+  5, 0, 0,  7, 1, 1,
+  6, 0, 1,
+  7, 0, 1,
+
+  0, 0, 1,	// Extra delay
+
+// Back again
+
+            7, 1, 1,
+            6, 1, 1,
+  7, 0, 0,  5, 1, 1,
+  6, 0, 0,  4, 1, 1,
+  5, 0, 0,  3, 1, 1,
+  4, 0, 0,  2, 1, 1,
+  3, 0, 0,  1, 1, 1,
+  2, 0, 0,  0, 1, 1,
+  1, 0, 1,
+  0, 0, 1,
+
+  0, 0, 1,	// Extra delay
+
+  9, 9, 9,	// End marker
+
+} ;
+
+
+int main (void)
+{
+  int pin ;
+  int dataPtr ;
+  int l, s, d ;
+
+  printf ("Raspberry Pi wiringPi test program\n") ;
+
+  if (wiringPiSetup () == -1)
+    exit (1) ;
+
+  for (pin = 0 ; pin < 8 ; ++pin)
+    pinMode (pin, OUTPUT) ;
+
+  pinMode (8, INPUT) ; 	// Pin 8 SDA0 - Has on-board 2k2 pull-up resistor
+
+  dataPtr = 0 ;
+
+  for (;;)
+  {
+    l = data [dataPtr++] ;	// LED
+    s = data [dataPtr++] ;	// State
+    d = data [dataPtr++] ;	// Duration (10ths)
+
+    if ((l + s + d) == 27)
+    {
+      dataPtr = 0 ;
+      continue ;
+    }
+
+    digitalWrite (l, s) ;
+
+    if (digitalRead (8) == 0)	// Pressed as our switch shorts to ground
+      delay (d * 10) ;	// Faster!
+    else
+      delay (d * 100) ;
+  }
+
+  return 0 ;
+}

BIN
examples/test2


+ 41 - 0
examples/test2.c

@@ -0,0 +1,41 @@
+
+/*
+ * test2.c:
+ *	Simple test program to test the wiringPi functions
+ *	PWM test
+ */
+
+#include <wiringPi.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+int main (void)
+{
+  int bright ;
+
+  printf ("Raspberry Pi wiringPi PWM test program\n") ;
+
+  if (wiringPiSetup () == -1)
+    exit (1) ;
+
+  pinMode (1, PWM_OUTPUT) ;
+
+  for (;;)
+  {
+    for (bright = 0 ; bright < 1024 ; ++bright)
+    {
+      pwmWrite (1, bright) ;
+      delay (1) ;
+    }
+
+    for (bright = 1023 ; bright >= 0 ; --bright)
+    {
+      pwmWrite (1, bright) ;
+      delay (1) ;
+    }
+  }
+
+  return 0 ;
+}

+ 674 - 0
gpio/COPYING

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+
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+
+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
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+
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+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
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+
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+possible use to the public, the best way to achieve this is to make it
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+
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+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+
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+
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+if any, to sign a "copyright disclaimer" for the program, if necessary.
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+<http://www.gnu.org/licenses/>.
+
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+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

+ 73 - 0
gpio/Makefile

@@ -0,0 +1,73 @@
+#
+# Makefile:
+#	wiringPi - Wiring Compatable library for the Raspberry Pi
+#	https://projects.drogon.net/wiring-pi
+#
+#	Copyright (c) 2012 Gordon Henderson
+#################################################################################
+# This file is part of wiringPi:
+#	Wiring Compatable library for the Raspberry Pi
+#
+#    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/>.
+#################################################################################
+
+
+#DEBUG	= -g -O0
+DEBUG	= -O3
+CC	= gcc
+INCLUDE	= -I/usr/local/include
+CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe
+
+LDFLAGS	= -L/usr/local/lib
+LIBS    = -lwiringPi
+
+# Should not alter anything below this line
+###############################################################################
+
+SRC	=	gpio.c
+
+OBJ	=	gpio.o
+
+all:		gpio
+
+gpio:	gpio.o
+	@echo [LD]
+	@$(CC) -o $@ gpio.o $(LDFLAGS) $(LIBS)
+	
+.c.o:
+	@echo [CC] $<
+	@$(CC) -c $(CFLAGS) $< -o $@
+
+clean:
+	rm -f $(OBJ) gpio *~ core tags
+
+tags:	$(SRC)
+	@echo [ctags]
+	@ctags $(SRC)
+
+depend:
+	makedepend -Y $(SRC)
+
+install:
+	cp gpio /usr/local/bin
+	chown root.root /usr/local/bin/gpio
+	chmod 4755 /usr/local/bin/gpio
+	mkdir -p /usr/local/man/man1
+	cp gpio.1 /usr/local/man/man1
+
+uninstall:
+	rm -f /usr/local/bin/gpio
+	rm -f /usr/local/man/man1/gpio.1
+
+# DO NOT DELETE

+ 145 - 0
gpio/gpio.1

@@ -0,0 +1,145 @@
+.TH "GPIO" "14 June 2012" "Command-Line access to Raspberry Pi GPIO"
+
+.SH NAME
+gpio \- Command-line access to Raspberry Pi GPIO
+
+.SH SYNOPSIS
+.B gpio
+.RB [ \-g ]
+.RB < read/write/pwm/mode ...>
+.TP
+.B gpio
+.RB < export/unexport/exports ...>
+
+.SH DESCRIPTION
+
+.B GPIO
+is a command line tool to allow the user easy access to the GPIO pins
+on the Raspberry Pi. It's designed for simple testing and diagnostic
+purposes, but can be used in shell scripts for general if somewhat slow
+control of the GPIO pins.
+
+Additionally, it can be used to set the exports in the /sys/class/gpio
+system directory to allow subsequent programs to use the /sys/class/gpio
+interface without needing to be run as root.
+
+.SH OPTIONS
+
+.TP
+.B \-g
+Use the BCM_GPIO pins numbers rather than WiringPi pin numbers.
+
+.TP
+.B read
+Read the digital value of the given pin and print 0 or 1 to represent the
+respective logic levels.
+
+.TP
+.B write
+Write the given value (0 or 1) to the pin.
+
+.TP
+.B pwm
+Write a PWM value (0-1023) to the given pin.
+
+.TP
+.B mode
+Set a pin into input, output or pwm mode. Can also use the literals up, down or tri
+to set the internal pull-up, pull-down or tristate controls.
+
+.TP
+.B export
+Export a GPIO pin in the /sys/class/gpio directory. Use like the mode command above
+however only in and out are supported at this time.
+
+Once a GPIO pin has been exported, the
+.B gpio
+program changes the ownership of the /sys/class/gpio/gpioX/value pseudo file to
+that of the user running the
+.B gpio
+program. This means that you can have a small script of gpio exports to setup
+the gpio pins as your program requires without the need to run anything as
+root, or with the sudo command.
+
+.TP
+.B unexport
+Un-Export a GPIO pin in the /sys/class/gpio directory.
+
+.TP
+.B exports
+Print a list (if any) of all the exported GPIO pins and their current values.
+
+.SH "WiringPi vs. GPIO Pin numbering"
+
+.PP
+.TS
+r r l.
+WiringPi	GPIO	Function
+_
+0	17
+1	18	(PWM)
+2	21
+3	22
+4	23
+5	24
+6	25
+7	4
+8	0	SDA0
+9	1	SCL0
+10	8	SPI CE0
+11	7	SPI CE1
+12	10	SPI MOSI
+13	9	SPI MISO
+14	11	SPI SCLK
+15	14	TxD
+16	15	RxD
+.TE
+
+.SH FILES
+
+.TP 2.2i
+.I gpio
+executable
+
+.SH EXAMPLES
+.TP 2.2i
+gpio mode 4 output # Set pin 4 to output
+.PP
+gpio -g mode 23 output # Set GPIO pin 23 to output (same as WiringPi pin 4)
+.PP
+gpio mode 1 pwm # Set pin 1 to PWM mode
+.PP
+gpio pwm 1 512 # Set pin 1 to PWM value 512 - half brightness
+.PP
+gpio export 17 out # Set GPIO Pin 17 to output
+.PP
+gpio export 0 in # Set GPIO Pin 0 (SDA0) to input.
+.PP
+gpio -g read 0 # Read GPIO Pin 0 (SDA0)
+
+.SH "NOTES"
+
+When using the export or unexport commands, the pin numbers are
+.B always
+native GPIO numbers and never wiringPi pin numbers.
+
+.SH "SEE ALSO"
+
+.LP
+WiringPi's home page
+.IP
+https://projects.drogon.net/raspberry-pi/wiringpi/
+
+.SH AUTHOR
+
+Gordon Henderson
+
+.SH "REPORTING BUGS"
+
+Report bugs to <gordon@drogon.net>
+
+.SH COPYRIGHT
+
+Copyright (c) 2012 Gordon Henderson
+This is free software; see the source for copying conditions. There is NO
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

+ 418 - 0
gpio/gpio.c

@@ -0,0 +1,418 @@
+/*
+ * gpio.c:
+ *	Set-UID command-line interface to the Raspberry Pi's GPIO
+ *	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 <wiringPi.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+//#include <sys/stat.h>
+#include <fcntl.h>
+
+
+static int wpMode ;
+
+
+char *usage = "Usage: gpio [-g] <read/write/pwm/mode/export/unexport/exports> ..." ;
+
+
+/*
+ * doExports:
+ *	List all GPIO exports
+ *********************************************************************************
+ */
+
+void doExports (void)
+{
+  int fd ;
+  int i, l, first ;
+  char fName [128] ;
+  char dir, val ;
+
+// Rather crude, but who knows what others are up to...
+
+  for (first = 0, i = 0 ; i < 64 ; ++i)
+  {
+
+// Try to read the direction
+
+    sprintf (fName, "/sys/class/gpio/gpio%d/direction", i) ;
+    if ((fd = open (fName, O_RDONLY)) == -1)
+      continue ;
+
+    if (first == 0)
+    {
+      ++first ;
+      printf ("GPIO Pins exported:\n") ;
+    }
+
+    printf ("%4d: ", i) ;
+
+    if ((l = read (fd, &dir, 1)) == 0)
+    {
+      printf ("Empty direction file (why?)\n") ;
+      close (fd) ;
+      continue ;
+    }
+
+    /**/ if (dir == 'o')
+      printf ("Output ") ;
+    else if (dir == 'i')
+      printf ("Input  ") ;
+    else
+      printf ("Wrong  ") ;
+
+    close (fd) ;
+
+// Try to Read the value
+
+    sprintf (fName, "/sys/class/gpio/gpio%d/value", i) ;
+    if ((fd = open (fName, O_RDONLY)) == -1)
+    {
+      printf ("No Value file (huh?)\n") ;
+      continue ;
+    }
+
+    if ((l = read (fd, &val, 1)) == 0)
+    {
+      printf ("Empty Value file (why?)\n") ;
+      close (fd) ;
+      continue ;
+    }
+
+    /**/ if (val == '0' )
+      printf ("(0)\n") ;
+    else if (val == '1')
+      printf ("(1)\n") ;
+    else
+      printf ("(?)\n") ;
+
+    close (fd) ;
+  }
+}
+
+
+/*
+ * doExport:
+ *	gpio export pin mode
+ *	This uses the /sys/class/gpio device interface.
+ *********************************************************************************
+ */
+
+void doExport (int argc, char *argv [])
+{
+  FILE *fd ;
+  int pin ;
+  char *mode ;
+  char fName [128] ;
+  uid_t uid ;
+  gid_t gid ;
+
+  if (argc != 4)
+  {
+    fprintf (stderr, "Usage: %s export pin mode\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pin = atoi (argv [2]) ;
+
+  mode = argv [3] ;
+
+  if ((fd = fopen ("/sys/class/gpio/export", "w")) == NULL)
+  {
+    fprintf (stderr, "%s: Unable to open GPIO export interface: %s\n", argv [0], strerror (errno)) ;
+    exit (1) ;
+  }
+
+  fprintf (fd, "%d\n", pin) ;
+  fclose (fd) ;
+
+  sprintf (fName, "/sys/class/gpio/gpio%d/direction", pin) ;
+  if ((fd = fopen (fName, "w")) == NULL)
+  {
+    fprintf (stderr, "%s: Unable to open GPIO direction interface for pin %d: %s\n", argv [0], pin, strerror (errno)) ;
+    exit (1) ;
+  }
+
+  /**/ if (strcasecmp (mode, "in")   == 0)
+    fprintf (fd, "in\n") ;
+  else if (strcasecmp (mode, "out")  == 0)
+    fprintf (fd, "out\n") ;
+  else
+  {
+    fprintf (stderr, "%s: Invalid mode: %s. Should be in or out\n", argv [1], mode) ;
+    exit (1) ;
+  }
+
+  fclose (fd) ;
+
+// Change ownership so the current user can actually use it!
+
+  uid = getuid () ;
+  gid = getgid () ;
+
+  sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;
+  if (chown (fName, uid, gid) != 0)
+  {
+    fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
+    exit (1) ;
+  }
+  
+}
+
+
+/*
+ * doUnexport:
+ *	gpio unexport pin
+ *	This uses the /sys/class/gpio device interface.
+ *********************************************************************************
+ */
+
+void doUnexport (int argc, char *argv [])
+{
+  FILE *fd ;
+  int pin ;
+
+  if (argc != 3)
+  {
+    fprintf (stderr, "Usage: %s unexport pin\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pin = atoi (argv [2]) ;
+
+  if ((fd = fopen ("/sys/class/gpio/unexport", "w")) == NULL)
+  {
+    fprintf (stderr, "%s: Unable to open GPIO export interface\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  fprintf (fd, "%d\n", pin) ;
+  fclose (fd) ;
+}
+
+/*
+ * doMode:
+ *	gpio mode pin mode ...
+ *********************************************************************************
+ */
+
+void doMode (int argc, char *argv [])
+{
+  int pin ;
+  char *mode ;
+
+  if (argc != 4)
+  {
+    fprintf (stderr, "Usage: %s mode pin mode\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pin = atoi (argv [2]) ;
+
+  if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
+    return ;
+
+  mode = argv [3] ;
+
+  /**/ if (strcasecmp (mode, "in")   == 0)
+    pinMode (pin, INPUT) ;
+  else if (strcasecmp (mode, "out")  == 0)
+    pinMode (pin, OUTPUT) ;
+  else if (strcasecmp (mode, "pwm")  == 0)
+    pinMode (pin, PWM_OUTPUT) ;
+  else if (strcasecmp (mode, "up")   == 0)
+    pullUpDnControl (pin, PUD_UP) ;
+  else if (strcasecmp (mode, "down") == 0)
+    pullUpDnControl (pin, PUD_DOWN) ;
+  else if (strcasecmp (mode, "tri") == 0)
+    pullUpDnControl (pin, PUD_OFF) ;
+  else
+  {
+    fprintf (stderr, "%s: Invalid mode: %s. Should be in/out/pwm/up/down/tri\n", argv [1], mode) ;
+    exit (1) ;
+  }
+}
+
+/*
+ * doWrite:
+ *	gpio write pin value
+ *********************************************************************************
+ */
+
+void doWrite (int argc, char *argv [])
+{
+  int pin, val ;
+
+  if (argc != 4)
+  {
+    fprintf (stderr, "Usage: %s write pin value\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pin = atoi (argv [2]) ;
+
+  if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
+    return ;
+
+  val = atoi (argv [3]) ;
+
+  /**/ if (val == 0)
+    digitalWrite (pin, LOW) ;
+  else
+    digitalWrite (pin, HIGH) ;
+}
+
+
+/*
+ * doRead:
+ *	Read a pin and return the value
+ *********************************************************************************
+ */
+
+void doRead (int argc, char *argv []) 
+{
+  int pin, val ;
+
+  if (argc != 3)
+  {
+    fprintf (stderr, "Usage: %s read pin\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pin = atoi (argv [2]) ;
+
+  if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
+  {
+    printf ("0\n") ;
+    return ;
+  }
+
+  val = digitalRead (pin) ;
+
+  printf ("%s\n", val == 0 ? "0" : "1") ;
+}
+
+
+/*
+ * doPwm:
+ *	Output a PWM value on a pin
+ *********************************************************************************
+ */
+
+void doPwm (int argc, char *argv [])
+{
+  int pin, val ;
+
+  if (argc != 4)
+  {
+    fprintf (stderr, "Usage: %s pwm <pin> <value>\n", argv [0]) ;
+    exit (1) ;
+  }
+
+  pin = atoi (argv [2]) ;
+
+  if ((wpMode == WPI_MODE_PINS) && ((pin < 0) || (pin >= NUM_PINS)))
+    return ;
+
+  val = atoi (argv [3]) ;
+
+  pwmWrite (pin, val) ;
+}
+
+
+/*
+ * main:
+ *	Start here
+ *********************************************************************************
+ */
+
+int main (int argc, char *argv [])
+{
+  int i ;
+
+  if (argc == 1)
+  {
+    fprintf (stderr, "%s: %s\n", argv [0], usage) ;
+    return 1 ;
+  }
+
+  if (geteuid () != 0)
+  {
+    fprintf (stderr, "%s: Must be root to run\n", argv [0]) ;
+    return 1 ;
+  }
+
+// Initial test for /sys/class/gpio operations:
+
+  /**/ if (strcasecmp (argv [1], "exports" ) == 0)
+    { doExports () ;		return 0 ; }
+  else if (strcasecmp (argv [1], "export"  ) == 0)
+    { doExport (argc, argv) ;	return 0 ; }
+  else if (strcasecmp (argv [1], "unexport") == 0)
+    { doUnexport (argc, argv) ;	return 0 ; }
+
+// Check for -g argument
+
+  if (strcasecmp (argv [1], "-g") == 0)
+  {
+    if (wiringPiSetupGpio () == -1)
+    {
+      fprintf (stderr, "%s: Unable to initialise GPIO in GPIO mode.\n", argv [0]) ;
+      exit (1) ;
+    }
+
+    for (i = 2 ; i < argc ; ++i)
+      argv [i - 1] = argv [i] ;
+    --argc ;
+    wpMode = WPI_MODE_GPIO ;
+  }
+  else
+  {
+    if (wiringPiSetup () == -1)
+    {
+      fprintf (stderr, "%s: Unable to initialise GPIO in wiringPi mode\n", argv [0]) ;
+      exit (1) ;
+    }
+    wpMode = WPI_MODE_PINS ;
+  }
+
+  /**/ if (strcasecmp (argv [1], "write"   ) == 0)
+    doWrite  (argc, argv) ;
+  else if (strcasecmp (argv [1], "read"    ) == 0)
+    doRead   (argc, argv) ;
+  else if (strcasecmp (argv [1], "mode"    ) == 0)
+    doMode   (argc, argv) ;
+  else if (strcasecmp (argv [1], "pwm"     ) == 0)
+    doPwm    (argc, argv) ;
+  else
+  {
+    fprintf (stderr, "%s: Unknown command: %s. (read/write/pwm/mode/export/unexport expected)\n", argv [0], argv [1]) ;
+    exit (1) ;
+  }
+  return 0 ;
+}

+ 23 - 0
gpio/test.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# Simple test - assumes LEDs on Pins 0-7.
+
+for i in `seq 0 7`;
+do
+  gpio mode $i out
+done
+
+while true;
+do
+  for i in `seq 0 7`;
+  do
+    gpio write $i 1
+    sleep 0.1
+  done
+
+  for i in `seq 0 7`;
+  do
+    gpio write $i 0
+    sleep 0.1
+  done
+done

+ 674 - 0
wiringPi/COPYING

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
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+for you must do so exclusively on your behalf, under your direction
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+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
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+modification of the work as a means of enforcing, against the work's
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+
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+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
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+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
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+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
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+    long as you offer spare parts or customer support for that product
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+    copy of the Corresponding Source for all the software in the
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+
+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+to collect a royalty for further conveying from those to whom you convey
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+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
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+option of following the terms and conditions either of that numbered
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+Foundation.  If the Program does not specify a version number of the
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+
+  If the Program specifies that a proxy can decide which future
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+to choose that version for the Program.
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+  Later license versions may give you additional or different
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+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
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+  17. Interpretation of Sections 15 and 16.
+
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+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
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+
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+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program 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.
+
+    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

+ 83 - 0
wiringPi/Makefile

@@ -0,0 +1,83 @@
+#
+# Makefile:
+#	wiringPi - Wiring Compatable library for the Raspberry Pi
+#
+#	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/>.
+#################################################################################
+
+
+TARGET=libwiringPi.a
+
+#DEBUG	= -g -O0
+DEBUG	= -O3
+CC	= gcc
+INCLUDE	= -I.
+CFLAGS	= $(DEBUG) -Wall $(INCLUDE) -Winline -pipe
+
+LIBS    =
+
+# Should not alter anything below this line
+###############################################################################
+
+SRC	=	wiringPi.c serial.c wiringShift.c
+
+OBJ	=	wiringPi.o serial.o wiringShift.o
+
+all:		$(TARGET)
+
+$(TARGET):	$(OBJ)
+	@echo [AR] $(OBJ)
+	@ar rcs $(TARGET) $(OBJ)
+	@size $(TARGET)
+
+.c.o:
+	@echo [CC] $<
+	@$(CC) -c $(CFLAGS) $< -o $@
+
+clean:
+	rm -f $(OBJ) $(TARGET) *~ core tags Makefile.bak
+
+tags:	$(SRC)
+	@echo [ctags]
+	@ctags $(SRC)
+
+depend:
+	makedepend -Y $(SRC)
+
+install:	$(TARGET)
+	@echo [install]
+	install -m 0755 -d /usr/local/lib
+	install -m 0755 -d /usr/local/include
+	install -m 0644 wiringPi.h /usr/local/include
+	install -m 0644 serial.h /usr/local/include
+	install -m 0644 wiringShift.h /usr/local/include
+	install -m 0644 libwiringPi.a /usr/local/lib
+
+uninstall:
+	@echo [uninstall]
+	rm -f /usr/local/include/wiringPi.h
+	rm -f /usr/local/lib/libwiringPi.a
+
+
+
+# DO NOT DELETE
+
+wiringPi.o: wiringPi.h
+serial.o: serial.h
+wiringShift.o: wiringPi.h wiringShift.h

+ 7 - 0
wiringPi/README

@@ -0,0 +1,7 @@
+
+WiringPi: An implementation of most of the Arduino Wiring
+	functions for the Raspberry Pi
+
+Full details at:
+	https://projects.drogon.net/raspberry-pi/wiringpi/
+

+ 204 - 0
wiringPi/serial.c

@@ -0,0 +1,204 @@
+/*
+ * serial.c:
+ *	Handle a serial port
+ ***********************************************************************
+ * 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 <stdarg.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "serial.h"
+
+/*
+ * serialOpen:
+ *	Open and initialise the serial port, setting all the right
+ *	port parameters - or as many as are required - hopefully!
+ *********************************************************************************
+ */
+
+int serialOpen (char *device, int baud)
+{
+  struct termios options ;
+  speed_t myBaud ;
+  int     status, fd ;
+
+#ifdef	DEBUG
+  printf ("openSerialPort: <%s> baud: $d\n", device, baud) ;
+#endif
+
+  switch (baud)
+  {
+    case     50:	myBaud =     B50 ; break ;
+    case     75:	myBaud =     B75 ; break ;
+    case    110:	myBaud =    B110 ; break ;
+    case    134:	myBaud =    B134 ; break ;
+    case    150:	myBaud =    B150 ; break ;
+    case    200:	myBaud =    B200 ; break ;
+    case    300:	myBaud =    B300 ; break ;
+    case    600:	myBaud =    B600 ; break ;
+    case   1200:	myBaud =   B1200 ; break ;
+    case   1800:	myBaud =   B1800 ; break ;
+    case   2400:	myBaud =   B2400 ; break ;
+    case   9600:	myBaud =   B9600 ; break ;
+    case  19200:	myBaud =  B19200 ; break ;
+    case  38400:	myBaud =  B38400 ; break ;
+    case  57600:	myBaud =  B57600 ; break ;
+    case 115200:	myBaud = B115200 ; break ;
+    case 230400:	myBaud = B230400 ; break ;
+
+    default:
+      return -2 ;
+  }
+
+  if ((fd = open (device, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK)) == -1)
+    return -1 ;
+
+  fcntl (fd, F_SETFL, O_RDWR) ;
+
+// Get and modify current options:
+
+  tcgetattr (fd, &options) ;
+
+  cfmakeraw   (&options) ;
+  cfsetispeed (&options, myBaud) ;
+  cfsetospeed (&options, myBaud) ;
+
+  options.c_cflag |= (CLOCAL | CREAD) ;
+  options.c_cflag &= ~PARENB ;
+  options.c_cflag &= ~CSTOPB ;
+  options.c_cflag &= ~CSIZE ;
+  options.c_cflag |= CS8 ;
+  options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG) ;
+  options.c_oflag &= ~OPOST ;
+
+  options.c_cc [VMIN]  =   0 ;
+  options.c_cc [VTIME] = 100 ;	// Ten seconds (100 deciseconds)
+
+  tcsetattr (fd, TCSANOW, &options) ;
+
+  ioctl (fd, TIOCMGET, &status);
+
+  status |= TIOCM_DTR ;
+  status |= TIOCM_RTS ;
+
+  ioctl (fd, TIOCMSET, &status);
+
+  usleep (10000) ;	// 10mS
+
+  return fd ;
+}
+
+
+/*
+ * serialClose:
+ *	Release the serial port
+ *********************************************************************************
+ */
+
+void serialClose (int fd)
+{
+  close (fd) ;
+}
+
+
+/*
+ * serialPutchar:
+ *	Send a single character to the serial port
+ *********************************************************************************
+ */
+
+void serialPutchar (int fd, uint8_t c)
+{
+  write (fd, &c, 1) ;
+}
+
+
+/*
+ * serialPuts:
+ *	Send a string to the serial port
+ *********************************************************************************
+ */
+
+void serialPuts (int fd, char *s)
+{
+  write (fd, s, strlen (s)) ;
+}
+
+/*
+ * serialPrintf:
+ *	Printf over Serial
+ *********************************************************************************
+ */
+
+void serialPrintf (int fd, char *message, ...)
+{
+  va_list argp ;
+  char buffer [1024] ;
+
+  va_start (argp, message) ;
+    vsnprintf (buffer, 1023, message, argp) ;
+  va_end (argp) ;
+
+  serialPuts (fd, buffer) ;
+}
+
+
+/*
+ * serialDataAvail:
+ *	Return the number of bytes of data avalable to be read in the serial port
+ *********************************************************************************
+ */
+
+int serialDataAvail (int fd)
+{
+  int result ;
+
+  if (ioctl (fd, FIONREAD, &result) == -1)
+    return -1 ;
+
+  return result ;
+}
+
+
+/*
+ * serialGetchar:
+ *	Get a single character from the serial device.
+ *	Note: Zero is a valid character and this function will time-out after
+ *	10 seconds.
+ *********************************************************************************
+ */
+
+int serialGetchar (int fd)
+{
+  uint8_t x ;
+
+  if (read (fd, &x, 1) != 1)
+    return -1 ;
+
+  return ((int)x) & 0xFF ;
+}

+ 41 - 0
wiringPi/serial.h

@@ -0,0 +1,41 @@
+/*
+ * serial.h:
+ *	Handle a serial port
+ ***********************************************************************
+ * 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/>.
+ ***********************************************************************
+ */
+
+#ifndef	_STDINT_H
+#  include <stdint.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int   serialOpen      (char *device, int baud) ;
+extern void  serialClose     (int fd) ;
+extern void  serialPutchar   (int fd, uint8_t c) ;
+extern void  serialPuts      (int fd, char *s) ;
+extern void  serialPrintf    (int fd, char *message, ...) ;
+extern int   serialDataAvail (int fd) ;
+extern int   serialGetchar   (int fd) ;
+
+#ifdef __cplusplus
+}
+#endif

+ 729 - 0
wiringPi/wiringPi.c

@@ -0,0 +1,729 @@
+/*
+ * wiringPi:
+ *	Arduino compatable (ish) Wiring library for the Raspberry Pi
+ *	Copyright (c) 2012 Gordon Henderson
+ *
+ *	Thanks to code samples from Gert Jan van Loo and the
+ *	BCM2835 ARM Peripherals manual, however it's missing
+ *	the clock section /grr/mutter/
+ ***********************************************************************
+ * 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/>.
+ ***********************************************************************
+ */
+
+// Revisions:
+//	 2 Jul 2012:
+//		Fixed a few more bugs to do with range-checking when in GPIO mode.
+//	11 Jun 2012:
+//		Fixed some typos.
+//		Added c++ support for the .h file
+//		Added a new function to allow for using my "pin" numbers, or native
+//			GPIO pin numbers.
+//		Removed my busy-loop delay and replaced it with a call to delayMicroseconds
+//
+//	02 May 2012:
+//		Added in the 2 UART pins
+//		Change maxPins to numPins to more accurately reflect purpose
+
+// Pad drive current fiddling
+
+#undef	DEBUG_PADS
+
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <time.h>
+#include <fcntl.h>
+#include <sys/time.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+
+
+#include "wiringPi.h"
+
+#ifndef	TRUE
+#define	TRUE	(1==1)
+#define	FALSE	(1==2)
+#endif
+
+// Port function select bits
+
+#define	FSEL_INPT		0b000
+#define	FSEL_OUTP		0b001
+#define	FSEL_ALT0		0b100
+#define	FSEL_ALT0		0b100
+#define	FSEL_ALT1		0b101
+#define	FSEL_ALT2		0b110
+#define	FSEL_ALT3		0b111
+#define	FSEL_ALT4		0b011
+#define	FSEL_ALT5		0b010
+
+// Access from ARM Running Linux
+//	Take from Gerts code. Some of this is not in the manual
+//	that I can find )-:
+
+#define BCM2708_PERI_BASE	0x20000000
+#define GPIO_PADS		(BCM2708_PERI_BASE + 0x100000)
+#define CLOCK_BASE		(BCM2708_PERI_BASE + 0x101000)
+#define GPIO_BASE		(BCM2708_PERI_BASE + 0x200000)
+#define GPIO_PWM		(BCM2708_PERI_BASE + 0x20C000)
+
+#define	PAGE_SIZE		(4*1024)
+#define	BLOCK_SIZE		(4*1024)
+
+// PWM
+
+#define	PWM_CONTROL 0
+#define	PWM_STATUS  1
+#define	PWM0_RANGE  4
+#define	PWM0_DATA   5
+#define	PWM1_RANGE  8
+#define	PWM1_DATA   9
+
+#define	PWMCLK_CNTL	40
+#define	PWMCLK_DIV	41
+
+#define	PWM1_MS_MODE    0x8000  // Run in MS mode
+#define	PWM1_USEFIFO    0x2000  // Data from FIFO
+#define	PWM1_REVPOLAR   0x1000  // Reverse polarity
+#define	PWM1_OFFSTATE   0x0800  // Ouput Off state
+#define	PWM1_REPEATFF   0x0400  // Repeat last value if FIFO empty
+#define	PWM1_SERIAL     0x0200  // Run in serial mode
+#define	PWM1_ENABLE     0x0100  // Channel Enable
+
+#define	PWM0_MS_MODE    0x0080  // Run in MS mode
+#define	PWM0_USEFIFO    0x0020  // Data from FIFO
+#define	PWM0_REVPOLAR   0x0010  // Reverse polarity
+#define	PWM0_OFFSTATE   0x0008  // Ouput Off state
+#define	PWM0_REPEATFF   0x0004  // Repeat last value if FIFO empty
+#define	PWM0_SERIAL     0x0002  // Run in serial mode
+#define	PWM0_ENABLE     0x0001  // Channel Enable
+
+
+// Locals to hold pointers to the hardware
+
+static volatile uint32_t *gpio ;
+static volatile uint32_t *pwm ;
+static volatile uint32_t *clk ;
+
+// The BCM2835 has 54 GPIO pins.
+//	BCM2835 data sheet, Page 90 onwards.
+//	There are 6 control registers, each control the functions of a block
+//	of 10 pins.
+//	Each control register has 10 sets of 3 bits per GPIO pin:
+//
+//	000 = GPIO Pin X is an input
+//	001 = GPIO Pin X is an output
+//	100 = GPIO Pin X takes alternate function 0
+//	101 = GPIO Pin X takes alternate function 1
+//	110 = GPIO Pin X takes alternate function 2
+//	111 = GPIO Pin X takes alternate function 3
+//	011 = GPIO Pin X takes alternate function 4
+//	010 = GPIO Pin X takes alternate function 5
+//
+// So the 3 bits for port X are:
+//	X / 10 + ((X % 10) * 3)
+
+// sysFds:
+//	Map a file descriptor from the /sys/class/gpio/gpioX/value file
+
+static int sysFds [64] ;
+
+// Mode
+
+static int gpioPinMode ;
+
+// Doing it the Arduino way with lookup tables...
+//	Yes, it's probably more innefficient than all the bit-twidling, but it
+//	does tend to make it all a bit clearer. At least to me!
+
+// pinToGpio:
+//	Take a Wiring pin (0 through X) and re-map it to the BCM_GPIO pin
+
+static int pinToGpio [] =
+{
+  17, 18, 21, 22, 23, 24, 25, 4,	// From the Original Wiki - GPIO 0 through 7
+   0,  1,				// I2C  - SDA0, SCL0
+   8,  7,				// SPI  - CE1, CE0
+  10,  9, 11, 				// SPI  - MOSI, MISO, SCLK
+  14, 15,				// UART - Tx, Rx
+} ;
+
+// gpioToGPFSEL:
+//	Map a BCM_GPIO pin to it's control port. (GPFSEL 0-5)
+
+static uint8_t gpioToGPFSEL [] =
+{
+  0,0,0,0,0,0,0,0,0,0,
+  1,1,1,1,1,1,1,1,1,1,
+  2,2,2,2,2,2,2,2,2,2,
+  3,3,3,3,3,3,3,3,3,3,
+  4,4,4,4,4,4,4,4,4,4,
+  5,5,5,5,5,5,5,5,5,5,
+} ;
+
+// gpioToShift
+//	Define the shift up for the 3 bits per pin in each GPFSEL port
+
+static uint8_t gpioToShift [] =
+{
+  0,3,6,9,12,15,18,21,24,27,
+  0,3,6,9,12,15,18,21,24,27,
+  0,3,6,9,12,15,18,21,24,27,
+  0,3,6,9,12,15,18,21,24,27,
+  0,3,6,9,12,15,18,21,24,27,
+} ;
+
+// gpioToGPSET:
+//	(Word) offset to the GPIO Set registers for each GPIO pin
+
+static uint8_t gpioToGPSET [] =
+{
+   7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+   8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+} ;
+
+// gpioToGPCLR:
+//	(Word) offset to the GPIO Clear registers for each GPIO pin
+
+static uint8_t gpioToGPCLR [] =
+{
+  10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
+  11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,
+} ;
+
+// gpioToGPLEV:
+//	(Word) offset to the GPIO Input level registers for each GPIO pin
+
+static uint8_t gpioToGPLEV [] =
+{
+  13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,
+  14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
+} ;
+
+// gpioToPUDCLK
+//	(Word) offset to the Pull Up Down Clock regsiter
+
+static uint8_t gpioToPUDCLK [] =
+{
+  38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,
+  39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,
+} ;
+
+// gpioToPwmALT
+//	the ALT value to put a GPIO pin into PWM mode
+
+static uint8_t gpioToPwmALT [] =
+{
+          0,         0,         0,         0,         0,         0,         0,         0,	//  0 ->  7
+          0,         0,         0,         0, FSEL_ALT0, FSEL_ALT0,         0,         0, 	//  8 -> 15
+          0,         0, FSEL_ALT5, FSEL_ALT5,         0,         0,         0,         0, 	// 16 -> 23
+          0,         0,         0,         0,         0,         0,         0,         0,	// 24 -> 31
+          0,         0,         0,         0,         0,         0,         0,         0,	// 32 -> 39
+  FSEL_ALT0, FSEL_ALT0,         0,         0,         0, FSEL_ALT0,         0,         0,	// 40 -> 47
+          0,         0,         0,         0,         0,         0,         0,         0,	// 48 -> 55
+          0,         0,         0,         0,         0,         0,         0,         0,	// 56 -> 63
+} ;
+
+static uint8_t gpioToPwmPort [] =
+{
+          0,         0,         0,         0,         0,         0,         0,         0,	//  0 ->  7
+          0,         0,         0,         0, PWM0_DATA, PWM1_DATA,         0,         0, 	//  8 -> 15
+          0,         0, PWM0_DATA, PWM1_DATA,         0,         0,         0,         0, 	// 16 -> 23
+          0,         0,         0,         0,         0,         0,         0,         0,	// 24 -> 31
+          0,         0,         0,         0,         0,         0,         0,         0,	// 32 -> 39
+  PWM0_DATA, PWM1_DATA,         0,         0,         0, PWM1_DATA,         0,         0,	// 40 -> 47
+          0,         0,         0,         0,         0,         0,         0,         0,	// 48 -> 55
+          0,         0,         0,         0,         0,         0,         0,         0,	// 56 -> 63
+
+} ;
+
+
+// Time for easy calculations
+
+static unsigned long long epoch ;
+
+//////////////////////////////////////////////////////////////////////////////////
+
+
+/*
+ * wiringPiGpioMode:
+ *	Set the mode - use Pin numbers (0-16) or GPIO number (seemingly random)
+ *********************************************************************************
+ */
+
+void wiringPiGpioMode (int mode)
+{
+  gpioPinMode = mode ;
+}
+
+
+/*
+ * wiringPiSetup:
+ *	Must be called once at the start of your program execution.
+ *
+ * Default setup: Initialises the system into wiringPi Pin mode and uses the
+ *	memory mapped hardware directly.
+ *********************************************************************************
+ */
+
+int wiringPiSetup (void)
+{
+  int      fd ;
+  uint8_t *gpioMem, *pwmMem, *clkMem ;
+  struct timeval tv ;
+
+#ifdef	DEBUG_PADS
+  uint8_t *gpioMem, *padsMem, *pwmMem, *clkMem ;
+  uint32_t *pads ;
+#endif
+
+// Set Pin mode by default
+
+  wiringPiGpioMode (WPI_MODE_PINS) ;
+  
+// Open the master /dev/memory device
+
+  if ((fd = open ("/dev/mem", O_RDWR | O_SYNC) ) < 0)
+  {
+    fprintf (stderr, "wiringPiSetup: Unable to open /dev/mem: %s\n", strerror (errno)) ;
+    return -1 ;
+  }
+
+// GPIO:
+
+// Allocate 2 pages - 1 ...
+
+  if ((gpioMem = malloc (BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
+  {
+    fprintf (stderr, "wiringPiSetup: malloc failed: %s\n", strerror (errno)) ;
+    return -1 ;
+  }
+
+// ... presumably to make sure we can round it up to a whole page size
+
+  if (((uint32_t)gpioMem % PAGE_SIZE) != 0)
+    gpioMem += PAGE_SIZE - ((uint32_t)gpioMem % PAGE_SIZE) ;
+
+  gpio = (uint32_t *)mmap((caddr_t)gpioMem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, GPIO_BASE) ;
+
+  if ((int32_t)gpio < 0)
+  {
+    fprintf (stderr, "wiringPiSetup: mmap failed: %s\n", strerror (errno)) ;
+    return -1 ;
+  }
+
+// PWM
+
+  if ((pwmMem = malloc (BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
+  {
+    fprintf (stderr, "wiringPiSetup: pwmMem malloc failed: %s\n", strerror (errno)) ;
+    return -1 ;
+  }
+
+  if (((uint32_t)pwmMem % PAGE_SIZE) != 0)
+    pwmMem += PAGE_SIZE - ((uint32_t)pwmMem % PAGE_SIZE) ;
+
+  pwm = (uint32_t *)mmap(pwmMem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, GPIO_PWM) ;
+
+  if ((int32_t)pwm < 0)
+  {
+    fprintf (stderr, "wiringPiSetup: mmap failed (pwm): %s\n", strerror (errno)) ;
+    return -1 ;
+  }
+ 
+// Clock control (needed for PWM)
+
+  if ((clkMem = malloc (BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
+  {
+    fprintf (stderr, "wiringPiSetup: clkMem malloc failed: %s\n", strerror (errno)) ;
+    return -1 ;
+  }
+
+  if (((uint32_t)clkMem % PAGE_SIZE) != 0)
+    clkMem += PAGE_SIZE - ((uint32_t)clkMem % PAGE_SIZE) ;
+
+  clk = (uint32_t *)mmap(clkMem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, CLOCK_BASE) ;
+
+  if ((int32_t)clk < 0)
+  {
+    fprintf (stderr, "wiringPiSetup: mmap failed (clk): %s\n", strerror (errno)) ;
+    return -1 ;
+  }
+ 
+#ifdef	DEBUG_PADS
+  if ((padsMem = malloc (BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
+  {
+    fprintf (stderr, "wiringPiSetup: padsMem malloc failed: %s\n", strerror (errno)) ;
+    return -1 ;
+  }
+
+  if (((uint32_t)padsMem % PAGE_SIZE) != 0)
+    padsMem += PAGE_SIZE - ((uint32_t)padsMem % PAGE_SIZE) ;
+
+  pads = (uint32_t *)mmap(padsMem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, fd, GPIO_PADS) ;
+
+  if ((int32_t)pads < 0)
+  {
+    fprintf (stderr, "wiringPiSetup: mmap failed (pads): %s\n", strerror (errno)) ;
+    return -1 ;
+  }
+ 
+  printf ("Checking pads @ 0x%08X\n", (unsigned int)pads) ;
+
+  printf ("%08X %08X %08X\n", *(pads + 11), *(pads + 12), *(pads + 13)) ;
+//  *(pads + 11) = 0x1F ;
+  printf ("%08X %08X %08X\n", *(pads + 11), *(pads + 12), *(pads + 13)) ;
+#endif
+
+  gettimeofday (&tv, NULL) ;
+  epoch = (tv.tv_sec * 1000000 + tv.tv_usec) / 1000 ;
+
+  return 0 ;
+}
+
+
+/*
+ * wiringPiSetupGpio:
+ *	Must be called once at the start of your program execution.
+ *
+ * GPIO setup: Initialises the system into GPIO Pin mode and uses the
+ *	memory mapped hardware directly.
+ *********************************************************************************
+ */
+
+int wiringPiSetupGpio (void)
+{
+  int x = wiringPiSetup () ;
+
+  if (x != 0)
+    return x ;
+
+  wiringPiGpioMode (WPI_MODE_GPIO) ;
+  return 0 ;
+}
+
+
+/*
+ * wiringPiSetupSys:
+ *	Must be called once at the start of your program execution.
+ *
+ * Initialisation (again), however this time we are using the /sys/class/gpio
+ *	interface to the GPIO systems - slightly slower, but always usable as
+ *	a non-root user, assuming the devices are already exported and setup correctly.
+ */
+
+int wiringPiSetupSys (void)
+{
+  int fd, pin ;
+  struct timeval tv ;
+  char fName [128] ;
+
+// Set GPIO_SYS mode by default
+
+  wiringPiGpioMode (WPI_MODE_GPIO_SYS) ;
+
+// Open and scan the directory, looking for exported GPIOs, and pre-open
+//	the 'value' part to speed things up for later
+  
+  for (pin = 0 ; pin < 64 ; ++pin)
+  {
+    sysFds [pin] = -1 ;
+    sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;
+    if ((fd = open (fName, O_RDWR)) == -1)
+      continue ;
+    sysFds [pin] = fd ;
+  }
+
+  gettimeofday (&tv, NULL) ;
+  epoch = (tv.tv_sec * 1000000 + tv.tv_usec) / 1000 ;
+
+  return 0 ;
+}
+
+
+/*
+ * pinMode:
+ *	Sets the mode of a pin to be input, output or PWM output
+ *********************************************************************************
+ */
+
+void pinMode (int pin, int mode)
+{
+  static int pwmRunning  = FALSE ;
+
+  int gpioPin, fSel, shift ;
+  int alt ;
+
+// We can't change the mode in GPIO_SYS mode
+
+  if (gpioPinMode == WPI_MODE_GPIO_SYS)
+    return ;
+
+  if (gpioPinMode == WPI_MODE_PINS)
+  {
+    if ((pin < 0) || (pin >= NUM_PINS))
+      return ;
+    gpioPin = pinToGpio    [pin] ;
+  }
+  else
+    gpioPin = pin ;
+
+  fSel    = gpioToGPFSEL [gpioPin] ;
+  shift   = gpioToShift  [gpioPin] ;
+
+  /**/ if (mode == INPUT)
+    *(gpio + fSel) = (*(gpio + fSel) & ~(7 << shift)) ; // Sets bits to zero = input
+  else if (mode == OUTPUT)
+    *(gpio + fSel) = (*(gpio + fSel) & ~(7 << shift)) | (1 << shift) ;
+  else if (mode == PWM_OUTPUT)
+  {
+    if ((alt = gpioToPwmALT [gpioPin]) == 0)	// Not a PWM pin
+      return ;
+
+// Set pin to PWM mode
+
+    *(gpio + fSel) = (*(gpio + fSel) & ~(7 << shift)) | (alt << shift) ;
+
+// We didn't initialise the PWM hardware at setup time - because it's possible that
+//	something else is using the PWM - e.g. the Audio systems! So if we use PWM
+//	here, then we're assuming that nothing else is, otherwise things are going
+//	to sound a bit funny...
+
+    if (!pwmRunning)
+    {
+
+//	Gert/Doms Values
+      *(clk + PWMCLK_DIV)  = 0x5A000000 | (32<<12) ;	// set pwm div to 32 (19.2/3 = 600KHz)
+      *(clk + PWMCLK_CNTL) = 0x5A000011 ;		// Source=osc and enable
+      digitalWrite (pin, LOW) ;
+      *(pwm + PWM_CONTROL) = 0 ;			// Disable PWM
+      delayMicroseconds (10) ;
+      *(pwm + PWM0_RANGE) = 0x400 ;
+      delayMicroseconds (10) ;
+      *(pwm + PWM1_RANGE) = 0x400 ;
+      delayMicroseconds (10) ;
+
+// Enable PWMs
+
+      *(pwm + PWM0_DATA) = 512 ;
+      *(pwm + PWM1_DATA) = 512 ;
+
+      *(pwm + PWM_CONTROL) = PWM0_ENABLE | PWM1_ENABLE ;
+    }
+
+  }
+
+// When we change mode of any pin, we remove the pull up/downs
+
+  pullUpDnControl (pin, PUD_OFF) ;
+}
+
+
+/*
+ * digitalWrite:
+ *	Set an output bit
+ *********************************************************************************
+ */
+
+void digitalWrite (int pin, int value)
+{
+  int gpioPin ;
+
+  if (gpioPinMode == WPI_MODE_PINS)
+  {
+    if ((pin < 0) || (pin >= NUM_PINS))
+      return ;
+    gpioPin = pinToGpio [pin] ;
+  }
+  else
+    gpioPin = pin ;
+
+  if (gpioPinMode == WPI_MODE_GPIO_SYS)
+  {
+    if (sysFds [gpioPin] != -1)
+    {
+      if (value == LOW)
+	write (sysFds [gpioPin], "0\n", 2) ;
+      else
+	write (sysFds [gpioPin], "1\n", 2) ;
+    }
+  }
+  else
+  {
+    if (value == LOW)
+      *(gpio + gpioToGPCLR [gpioPin]) = 1 << gpioPin ;
+    else
+      *(gpio + gpioToGPSET [gpioPin]) = 1 << gpioPin ;
+  }
+}
+
+
+/*
+ * pwnWrite:
+ *	Set an output PWM value
+ *********************************************************************************
+ */
+
+void pwmWrite (int pin, int value)
+{
+  int port, gpioPin ;
+
+// We can't do this in GPIO_SYS mode
+
+  if (gpioPinMode == WPI_MODE_GPIO_SYS)
+    return ;
+
+  if (gpioPinMode == WPI_MODE_PINS)
+  {
+    if ((pin < 0) || (pin >= NUM_PINS))
+      return ;
+    gpioPin = pinToGpio [pin] ;
+  }
+  else
+    gpioPin = pin ;
+
+  port = gpioToPwmPort [gpioPin] ;
+
+  *(pwm + port) = value & ~0x400 ;
+}
+
+
+/*
+ * digitalRead:
+ *	Read the value of a given Pin, returning HIGH or LOW
+ *********************************************************************************
+ */
+
+int digitalRead (int pin)
+{
+  int gpioPin ;
+  char c ;
+
+  if (gpioPinMode == WPI_MODE_PINS)
+  {
+    if ((pin < 0) || (pin >= NUM_PINS))
+      return 0 ;
+    gpioPin = pinToGpio [pin] ;
+  }
+  else
+    gpioPin = pin ;
+
+  if (gpioPinMode == WPI_MODE_GPIO_SYS)
+  {
+    if (sysFds [gpioPin] == -1)
+      return 0 ;
+    else
+    {
+      lseek (sysFds [gpioPin], 0L, SEEK_SET) ;
+      read  (sysFds [gpioPin], &c, 1) ;
+      return (c == '0') ? 0 : 1 ;
+    }
+  }
+  else
+  {
+    if ((*(gpio + gpioToGPLEV [gpioPin]) & (1 << gpioPin)) != 0)
+      return HIGH ;
+    else
+      return LOW ;
+  }
+}
+
+/*
+ * pullUpDownCtrl:
+ *	Control the internal pull-up/down resistors on a GPIO pin
+ *	The Arduino only has pull-ups and these are enabled by writing 1
+ *	to a port when in input mode - this paradigm doesn't quite apply
+ *	here though.
+ *********************************************************************************
+ */
+
+void pullUpDnControl (int pin, int pud)
+{
+  int gpioPin ;
+
+// We can't do this in GPIO_SYS mode
+
+  if (gpioPinMode == WPI_MODE_GPIO_SYS)
+    return ;
+
+  if (gpioPinMode == WPI_MODE_PINS)
+  {
+    if ((pin < 0) || (pin >= NUM_PINS))
+      return ;
+    gpioPin = pinToGpio [pin] ;
+  }
+  else
+    gpioPin = pin ;
+
+  *(gpio + 37) = pud ;
+  delayMicroseconds (10) ;
+  *(gpio + gpioToPUDCLK [gpioPin]) = 1 << gpioPin ;
+  delayMicroseconds (10) ;
+  
+  *(gpio + 37) = 0 ;
+  *(gpio + gpioToPUDCLK [gpioPin]) = 0 ;
+}
+
+
+/*
+ * delay: delayMicroseconds
+ *	Wait for some number of milli/micro seconds
+ *********************************************************************************
+ */
+
+void delay (unsigned int howLong)
+{
+  struct timespec sleeper, dummy ;
+
+  sleeper.tv_sec  = (time_t)(howLong / 1000) ;
+  sleeper.tv_nsec = (long)(howLong % 1000) * 1000000 ;
+
+  nanosleep (&sleeper, &dummy) ;
+}
+
+void delayMicroseconds (unsigned int howLong)
+{
+  struct timespec sleeper, dummy ;
+
+  sleeper.tv_sec  = 0 ;
+  sleeper.tv_nsec = (long)(howLong * 1000) ;
+
+  nanosleep (&sleeper, &dummy) ;
+}
+
+/*
+ * millis:
+ *	Return a number of milliseconds as an unsigned int.
+ *********************************************************************************
+ */
+
+unsigned int millis (void)
+{
+  struct timeval tv ;
+  unsigned long long t1 ;
+
+  gettimeofday (&tv, NULL) ;
+
+  t1 = (tv.tv_sec * 1000000 + tv.tv_usec) / 1000 ;
+
+  return (uint32_t)(t1 - epoch) ;
+}

+ 69 - 0
wiringPi/wiringPi.h

@@ -0,0 +1,69 @@
+/*
+ * wiringPi:
+ *	Arduino compatable (ish) Wiring library for the Raspberry Pi
+ *	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/>.
+ ***********************************************************************
+ */
+
+// Handy defines
+
+#define	NUM_PINS	17
+
+#define	WPI_MODE_PINS		 0
+#define	WPI_MODE_GPIO		 1
+#define	WPI_MODE_GPIO_SYS	 2
+
+#define	INPUT		 0
+#define	OUTPUT		 1
+#define	PWM_OUTPUT	 2
+
+#define	LOW		 0
+#define	HIGH		 1
+
+#define	PUD_OFF		 0
+#define	PUD_DOWN	 1
+#define	PUD_UP		 2
+
+// Function prototypes
+//	c++ wrappers thanks to a commend by Nick Lott
+//	(and others on the Raspberry Pi forums)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int  wiringPiSetup     (void) ;
+extern int  wiringPiSetupSys  (void) ;
+extern int  wiringPiSetupGpio (void) ;
+
+extern void wiringPiGpioMode  (int mode) ;
+
+extern void pullUpDnControl   (int pin, int pud) ;
+extern void pinMode           (int pin, int mode) ;
+extern void digitalWrite      (int pin, int value) ;
+extern void pwmWrite          (int pin, int value) ;
+extern int  digitalRead       (int pin) ;
+
+extern void         delay             (unsigned int howLong) ;
+extern void         delayMicroseconds (unsigned int howLong) ;
+extern unsigned int millis            (void) ;
+
+#ifdef __cplusplus
+}
+#endif

+ 84 - 0
wiringPi/wiringShift.c

@@ -0,0 +1,84 @@
+/*
+ * wiringShift.c:
+ *	Emulate some of the Arduino wiring functionality. 
+ *
+ * Copyright (c) 2009-2012 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 <stdint.h>
+
+#include "wiringPi.h"
+#include "wiringShift.h"
+
+/*
+ * shiftIn:
+ *	Shift data in from a clocked source
+ *********************************************************************************
+ */
+
+uint8_t shiftIn (uint8_t dPin, uint8_t cPin, uint8_t order)
+{
+  uint8_t value = 0 ;
+  int8_t  i ;
+ 
+  if (order == MSBFIRST)
+    for (i = 7 ; i >= 0 ; --i)
+    {
+      digitalWrite (cPin, HIGH) ;
+      value |= digitalRead (dPin) << i ;
+      digitalWrite (cPin, LOW) ;
+    }
+  else
+    for (i = 0 ; i < 8 ; ++i)
+    {
+      digitalWrite (cPin, HIGH) ;
+      value |= digitalRead (dPin) << i ;
+      digitalWrite (cPin, LOW) ;
+    }
+
+  return value;
+}
+
+
+/*
+ * shiftOut:
+ *	Shift data out to a clocked source
+ *********************************************************************************
+ */
+
+void shiftOut (uint8_t dPin, uint8_t cPin, uint8_t order, uint8_t val)
+{
+  int8_t i;
+
+  if (order == MSBFIRST)
+    for (i = 7 ; i >= 0 ; --i)
+    {
+      digitalWrite (dPin, val & (1 << i)) ;
+      digitalWrite (cPin, HIGH) ;
+      digitalWrite (cPin, LOW) ;
+    }
+  else
+    for (i = 0 ; i < 8 ; ++i)
+    {
+      digitalWrite (dPin, val & (1 << i)) ;
+      digitalWrite (cPin, HIGH) ;
+      digitalWrite (cPin, LOW) ;
+    }
+}

+ 41 - 0
wiringPi/wiringShift.h

@@ -0,0 +1,41 @@
+/*
+ * wiringShift.h:
+ *	Emulate some of the Arduino wiring functionality. 
+ *
+ * Copyright (c) 2009-2012 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/>.
+ ***********************************************************************
+ */
+
+#define	LSBFIRST	0
+#define	MSBFIRST	1
+
+#ifndef	_STDINT_H
+#  include <stdint.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint8_t shiftIn  (uint8_t dPin, uint8_t cPin, uint8_t order) ;
+extern void    shiftOut (uint8_t dPin, uint8_t cPin, uint8_t order, uint8_t val) ;
+
+#ifdef __cplusplus
+}
+#endif