On Fri, Aug 20, 2010 at 6:36 AM, Xiaohui Liu <[email protected]> wrote:
> Why the uint32_t is not aligned on a 32 bit boundary. Is it because the > MSP430 used on TelosB is 16-bit yes the msp430 is a 16 bit machine. > and 32-bit is sort of software-implemented? Thanks. > there are no 32 bit instructions so 32 bit abstractions such as uint32_t have to be implemented by the compiler. > > On Fri, Aug 20, 2010 at 2:50 AM, Eric Decker <[email protected]> wrote: > >> >> >> On Thu, Aug 19, 2010 at 10:01 PM, Xiaohui Liu <[email protected]> wrote: >> >>> Hi, >>> >>> For the following structure >>> struct foo{ >>> uint8_t foo_a; >>> uint32_t foo_b; >>> }; >>> what is the actual layout after compilation on a TelosB platform? Will it >>> be packed? Thanks. >>> >> >> unless explicit package is requested no packing is done. The struct will >> be laid out >> >> byte >> pad >> 32 d >> 32 c >> 32 b >> 32 a >> >> >> The 32 bit uint32_t will be laid out in little endian order on a 16 bit >> boundary. >> >> eric >> >> >> >>> >>> -- >>> -Xiaohui Liu >>> >>> _______________________________________________ >>> Tinyos-help mailing list >>> [email protected] >>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>> >> >> >> >> -- >> Eric B. Decker >> Senior (over 50 :-) Researcher >> >> >> > > > -- > -Xiaohui Liu > -- Eric B. Decker Senior (over 50 :-) Researcher
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