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Steffen Vogel
ad46aea829
git-svn-id: https://zerberus.eonerc.rwth-aachen.de:8443/svn/s2ss/trunk@159 8ec27952-4edc-4aab-86aa-e87bb2611832
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/** Message format
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014, Institute for Automation of Complex Power Systems, EONERC
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* @file
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*/
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#ifndef _MSG_FORMAT_H_
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#define _MSG_FORMAT_H_
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#include <stdint.h>
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/** Maximum number of dword values in a message */
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#define MSG_VALUES 16
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/** The current version number for the message format */
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#define MSG_VERSION 0
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/** @todo Implement more message types */
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#define MSG_TYPE_DATA 0
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#define MSG_TYPE_START 1
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#define MSG_TYPE_STOP 2
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/** Initialize a message */
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#define MSG_INIT(i) { \
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.version = MSG_VERSION, \
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.type = MSG_TYPE_DATA, \
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.length = i, \
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.sequence = 0 \
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}
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/** This message format is used by all clients
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*
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* @diafile msg_format.dia
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**/
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struct msg
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{
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/** The version specifies the format of the remaining message */
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unsigned version : 4;
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/** Data or control message */
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unsigned type : 2;
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/** These bits are reserved for future extensions */
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unsigned __padding : 2;
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/** Number of valid dword values in msg::data[] */
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uint8_t length;
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/** The sequence number gets incremented by one for consecutive messages */
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uint16_t sequence;
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/** The message payload */
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float data[MSG_VALUES];
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} __attribute__((packed));
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#endif /* _MSG_FORMAT_H_ */
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