changed nerdjack packet data type for 64 bit compilers and adjusted the Makefile…

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;