NeoGPS_cfg.h

#ifndef NEOGPS_CFG
#define NEOGPS_CFG

/**
 * Enable/disable packed data structures.
 *
 * Enabling packed data structures will use two less-portable language
 * features of GCC to reduce RAM requirements.  Although it was expected to slightly increase execution time and code size, the reverse is true on 8-bit AVRs: the code is smaller and faster with packing enabled.
 *
 * Disabling packed data structures will be very portable to other
 * platforms.  NeoGPS configurations will use slightly more RAM, and on
 * 8-bit AVRs, the speed is slightly slower, and the code is slightly
 * larger.  There may be no choice but to disable packing on processors 
 * that do not support packed structures.
 *
 * There may also be compiler-specific switches that affect packing and the
 * code which accesses packed members.  YMMV.
 **/

#define NEOGPS_PACKED_DATA

//------------------------------------------------------------------------
// Based on the above define, choose which set of packing macros should
// be used in the rest of the NeoGPS package.  Do not change these defines.

#ifdef NEOGPS_PACKED_DATA

// This is for specifying the number of bits to be used for a 
// member of a struct.  Booleans are typically one bit.
#define NEOGPS_BF(b) :b

// This is for requesting the compiler to pack the struct or class members
// "as closely as possible".  This is a compiler-dependent interpretation.
#define NEOGPS_PACKED __attribute__((packed))

#else

// Let the compiler do whatever it wants.

#define NEOGPS_PACKED
#define NEOGPS_BF(b)

#endif

#endif