CCS :: View topic - int16 within a STRUCT

CCS C Software and Maintenance Offers

FAQ

Official CCS Support

Profile Log in to check your private messages Log in

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to support@ccsinfo.com

int16 within a STRUCT

CCS Forum Index -> General CCS C Discussion

View previous topic :: View next topic

Author

Message

Sonic Concepts

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

int16 within a STRUCT

Posted: Mon Sep 19, 2005 6:10 pm

Reply with quote

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

Display posts from previous:

	CCS Forum Index -> General CCS C Discussion	All times are GMT - 6 Hours
Page 1 of 1

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001, 2005 phpBB Group