Hi,
> threading, so couldn't cope with more than one request. I only really
> need to know the syntax to recreate the packed structures. Unless the
> structures are packed by default in SDCC.
Structures are packed by default by sdcc. Why should they not be? We are
talking about 8-bit micro, aligning data items to anything other than 1
byte boundaries is (usually) useless. Bits are packed into bytes as
proposed (it is a bit vague here) by the standard:
struct {
int a;
int b1:1;
int b2:1;
int b3:1;
int :0; /* required, at least with the pic16 port ... */
/* compiler will pad with 5 bits here */
char c;
} s = { 0x1122, 0, 1, 1, 0x55 };
will yield (from low to high addresses)
|0x22|0x11|0x06|0x55|
a a' b c
LSB first, bits filling the bytes LSb first, padding inserted only after
incompletely filled bytes.
Bitfields spanning multiple bytes or crossing byte boundaries, such as
struct {
int r:5;
int g:6;
int b:5;
} rgb = { 1, 2, 3 };
do not work (at least with the pic ports).
Hope that helps,
Raphael
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