# HG changeset patch
# User kripperger@CL-SEC241-09.cedarville.edu
# Date 2013-03-21 15:45:36
# Node ID 9b507ed828baa51a6ab498d64c9562540424189a
# Parent  735b62d9b05edd1b9a7cea985f7af7b5168ab2a4

Added watchdog library

diff --git a/slave/slave/lib/SPIreadme.txt b/slave/slave/lib/SPIreadme.txt
new file mode 100644
--- /dev/null
+++ b/slave/slave/lib/SPIreadme.txt
@@ -0,0 +1,111 @@
+This directory contains a simple AVR spi helper library that should
+run on most AVR microcontrollers which support SPI.
+
+The code is further described at:
+http://www.rocketnumbernine.com/2009/04/26/using-spi-on-an-avr-1/ (basics & ADC)
+http://www.rocketnumbernine.com/2009/05/12/using-spi-on-an-avr-2/ (RTC)
+
+Any comments/questions to <andrew@rocketnumbernine.com>
+
+Make sure viewing this text in a fixed width font for the tables and diagrams
+
+
+----------------------------------
+Arduino
+----------------------------------
+The Arduino Directory contains all code required to run on the Arduino.
+Simply copy the Arduino/SPI and Arduino/DS1305 directories to the 
+"hardware/libraries" directory of your Arduino IDE installation and
+restart the Arduino IDE. Once restarted there should be
+"Sketch->Import Library->SPI" and "Sketch->Import Library->DS1305" menu
+entries which can be used to include the spi header files into your project.
+"File->Sketchbook->Examples->Library SPI" contains 3 example projects
+
+
+----------------------------------
+AVR GCC
+----------------------------------
+To use, just copy spi.h and spi.c (and ds1305.c and ds1305.h if using
+the DS1305 Real Time Clock chip) to your own project and compile.
+
+Makefile.mf - 'standard' generated make file from AVR GCC
+Makefile - Makefile "make examples" will make example programs below:
+
+spi-test-adc.c        MC3201 Analogue to Digital convertor example
+spi-test-rtc.c        DS1305 - Real-Time-Clock/Alarm example
+spi-test-masterslave.c        Master/Slave communication example
+
+
+----------------------------------
+PINS
+----------------------------------
+Following are the AVR pins used in the circuits below
+
+      ATmegaXXX  Arduino AT90usbXXX
+MISO    PB4        12       PB3
+MOSI    PB3        11       PB2
+SCK     PB5        13       PB1
+SS      PB2        10       PB0
+
+INT0    PD2         2       PD0   
+
+
+----------------------------------
+MC3201 12-bit ADC Circuit
+----------------------------------
+See http://ww1.microchip.com/downloads/en/DeviceDoc/21290D.pdf for full details.
+
+             +-----------------+
+             |     MC3201      |
+        +5V [| Vref        Vdd |] +5V
+             |                 |
+Analogue In [| IN+         CLK |] AVR SCK
+             |                 |
+     Ground [| IN-        Dout |] AVR MOSI
+             |                 |
+     Ground [| Vss         ^CS |] AVR CE
+             +-----------------+
+
+
+For testing purposes "Analogue In" can be connected to the middle wire
+of a potentiometer with one outer wire being connected to +5 and the
+other to Ground.  A 1uF Capacitor should be placed between the analogue
+input and ground, and +5V and ground as close to the chip as possible,
+but in a pinch the circuit will likely work without.
+
+
+MOSI/SLCK/CE to the relevant pin on the AVR (MISO is not used) - see above.
+
+----------------------------------
+DS1305 Real Time Clock Circuit
+----------------------------------
+See http://datasheets.maxim-ic.com/en/ds/DS1305.pdf for full details.
+
+Without a battery the following connections can be used:
+
+                +-----------------+
+                |      DS1305     |
+       Ground  [| Vcc2       Vcc1 |] +5V
+                |                 |
+       Ground  [| Vbat        ^PF |] Not Connected
+                |                 |
+       Crystal [| X1        Vccif |] +5V
+                |                 |
+       Crystal [| X2          SDO |] AVR MISO
+                |                 |
+ Not Connected [| N.C.        SDI |] AVR MOSI
+                |                 |
+      AVR INT0 [| INT0       SLCK |] AVR SLCK
+                |                 |
+ Not Connected [| INT1        CE  |] AVR CE
+                |                 |
+        Ground [| GND     SERMODE |] +5V
+                +-----------------+
+
+
+MISO/MOSI/SLCK/CE/INT0 to the relevant pin on the AVR - see above.
+
+
+
+
+
diff --git a/slave/slave/lib/watchdog.c b/slave/slave/lib/watchdog.c
new file mode 100644
--- /dev/null
+++ b/slave/slave/lib/watchdog.c
@@ -0,0 +1,28 @@
+/*
+ * watchdog.c
+ *
+ * Created: 3/12/2013 3:58:20 PM
+ *  Author: kripperger
+ */ 
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/wdt.h>
+
+//initialize watchdog
+void watchdog_setup(void)
+{
+	cli();
+	wdt_reset();
+	// Set change enable bit, enable the WDT
+	WDTCSR = (1<<WDCE)|(1<<WDE);
+	// Start watchdog, 4 second timeout
+	WDTCSR = (1<<WDE)|(1<<WDP3)|(1<<WDP0);
+	sei();
+}
+
+// ISR for watchdog timeout. ///////////Not currently used, interrupt is disabled.
+ISR(WDT_vect)
+{
+	
+}
diff --git a/slave/slave/lib/watchdog.h b/slave/slave/lib/watchdog.h
new file mode 100644
--- /dev/null
+++ b/slave/slave/lib/watchdog.h
@@ -0,0 +1,14 @@
+/*
+ * watchdog.h
+ *
+ * Created: 3/12/2013 3:58:54 PM
+ *  Author: kripperger
+ */ 
+
+
+#ifndef WATCHDOG_H_
+#define WATCHDOG_H_
+
+void watchdog_setup(void);
+
+#endif /* WATCHDOG_H_ */
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