changed nerdjack packet data type for 64 bit compilers and adjusted the Makefile for proper linking of the math library

git-svn-id: https://bucket.mit.edu/svn/nilm/acquisition/ethstream@10306 ddd99763-3ecb-0310-9145-efcb8ce7c51f

Makefile

@@ -14,7 +14,9 @@
 # Build options
 
 CFLAGS += -Wall -g #-pg
-LDFLAGS += -lm #-pg
+LDFLAGS += #-pg
+LDLIBS += -lm #CHANGED location from LDFLAGS for proper linking using gcc 
+
 PREFIX = /usr/local
 MANPATH = ${PREFIX}/man/man1/
 BINPATH = ${PREFIX}/bin

nerdjack.h

@@ -27,7 +27,8 @@
 /* Packet structure used in message to start sampling on NerdJack */
 typedef struct __attribute__ ((__packed__)) {
 	char word[4];
-	unsigned long period;
+	unsigned int period; //CHANGED FROM TYPE LONG. With 64 bit compilers longs are 8 bytes and nerdjack expects a 4 byte value
+	//since the int type is 4 bytes this works but should be changed to use defined datatypes rather than rely on compiler data types
 	unsigned short channelbit;
 	unsigned char precision;
 	unsigned char prescaler;