LPCXpresso IDEのトピックRe: Structure pack()

Structure pack()

lpcware — Wed, 15 Jun 2016 21:58:40 GMT

Content originally posted in LPCWare by SolomonViveros on Wed Jul 14 10:55:29 MST 2010
I'm use to Keil's #pragma pack(push,1)/#pragma pack(pop) directives...how/where is the structure packing defined in the LPCXpresso IDE?

Re: Structure pack()

lpcware — Wed, 15 Jun 2016 21:58:41 GMT

Content originally posted in LPCWare by CodeRedSupport on Wed Jul 14 12:32:12 MST 2010
You can pack individual structures with
[COLOR=red]__attribute__((__packed__))[/COLOR]

I suggest that the best way to use this is something like this:

#define PACKED [COLOR=red]__attribute__((__packed__))[/COLOR]

and you would define a structure like this:
struct test
{
        unsigned char field1;
        unsigned short field2;
        unsigned long field3;
} PACKED ;

Re: Structure pack()

lpcware — Wed, 15 Jun 2016 21:58:41 GMT

Content originally posted in LPCWare by whitecoe on Wed Jul 14 12:56:46 MST 2010
Not tried this in LPCXPresso, but the GCC docs suggest that #pragma pack is supported by the compiler....

http://gcc.gnu.org/onlinedocs/gcc-4.3.3/gcc/Structure_002dPacking-Pragmas.html#Structure_002dPacking-Pragmas