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90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/** Message format
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#pragma once
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#include <stdint.h>
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/** The current version number for the message format */
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#define MSG_VERSION 2
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/** @todo Implement more message types */
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#define MSG_TYPE_DATA 0 /**< Message contains float values */
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#define MSG_TYPE_START 1 /**< Message marks the beginning of a new simulation case */
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#define MSG_TYPE_STOP 2 /**< Message marks the end of a simulation case */
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/** The total size in bytes of a message */
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#define MSG_LEN(values) (sizeof(struct msg) + MSG_DATA_LEN(values))
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/** The length of \p values values in bytes. */
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#define MSG_DATA_LEN(values) (sizeof(float) * (values))
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/** The offset to the first data value in a message. */
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#define MSG_DATA_OFFSET(msg) ((char *) (msg) + offsetof(struct msg, data))
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/** Initialize a message with default values */
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#define MSG_INIT(len, seq) (struct msg) {\
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.version = MSG_VERSION, \
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.type = MSG_TYPE_DATA, \
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.length = len, \
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.sequence = seq \
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}
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/** The timestamp of a message in struct timespec format */
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#define MSG_TS(msg) (struct timespec) { \
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.tv_sec = (msg)->ts.sec, \
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.tv_nsec = (msg)->ts.nsec \
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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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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned rsvd1 : 2; /**< Reserved bits */
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unsigned type : 2; /**< Data or control message (see MSG_TYPE_*) */
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unsigned version: 4; /**< Specifies the format of the remaining message (see MGS_VERSION) */
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#elif BYTE_ORDER == BIG_ENDIAN
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unsigned version: 4; /**< Specifies the format of the remaining message (see MGS_VERSION) */
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unsigned type : 2; /**< Data or control message (see MSG_TYPE_*) */
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unsigned rsvd1 : 2; /**< Reserved bits */
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#endif
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uint8_t rsvd2; /**< Reserved bits */
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uint16_t length; /**< The number of values in msg::data[]. */
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uint32_t sequence; /**< The sequence number is incremented by one for consecutive messages. */
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/** A timestamp per message. */
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struct {
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uint32_t sec; /**< Seconds since 1970-01-01 00:00:00 */
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uint32_t nsec; /**< Nanoseconds of the current second. */
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} ts;
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/** The message payload. */
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union {
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float f; /**< Floating point values. */
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uint32_t i; /**< Integer values. */
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} data[];
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} __attribute__((packed));
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