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int16 within a STRUCT

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Sonic Concepts

Joined: 16 Sep 2005
Posts: 2
Location: Bothell, WA

int16 within a STRUCT

Posted: Mon Sep 19, 2005 6:10 pm

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I wanted to basically do something like:

Code:

struct {
unsigned preamble:8;
unsigned data:16;
unsigned crc:8;
}message;

but had to go with

Code:

struct {
unsigned preamble:8;
unsigned data_hi:8;
unsigned data_lo:8;
unsigned crc:8;
}message;

instead. Not really too much of a problem until I get to this part of the main program.

Code:

int16 data_temp;
#define TAG_ID_VALUE 0x6FC0
data_temp = TAG_ID_VALUE + id_counter;
//message.data_hi = MSB of data_temp
//message.data_lo = LSB of data_temp

I know about UNIONS and that I could create

Code:

union {
int8 data[2];
int16 data_temp;
} temp;

so that I could access the individual bytes within data_temp but I am at a loss as to how to combine the UNION and the STRUCT together.

Mark

Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

Posted: Mon Sep 19, 2005 6:28 pm

Reply with quote

It should be like this:

Code:

struct {
int8 preamble;
int16 data;
int8 crc;
}message;

Sonic Concepts

Joined: 16 Sep 2005
Posts: 2
Location: Bothell, WA


Posted: Mon Sep 19, 2005 6:37 pm

Thanks, that worked. Just shows that I know enough to be dangerous but not enough to really know what I'm doing

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