The goal of this software is to automatically generate C/C++ code which reads and writes GOOSE and Sampled Value packets. Any valid IEC 61850 Substation Configuration Description (SCD) file, describing GOOSE and/or SV communications, can be used as the input. The output code is lightweight and platform-independent, so it can run on a variety of devices, including low-cost microcontrollers. It\'s ideal for rapid-prototyping new protection and control systems that require communications. This mbed project is a simple example of this functionality. Other code: https://github.com/stevenblair/rapid61850 Project homepage: http://personal.strath.ac.uk/steven.m.blair/
Diff: svDecodePacket.c
- Revision:
- 1:9399d44c2b1a
- Parent:
- 0:230c10b228ea
--- a/svDecodePacket.c Fri Oct 07 13:41:08 2011 +0000 +++ b/svDecodePacket.c Fri Oct 07 13:48:18 2011 +0000 @@ -1,3 +1,23 @@ +/** + * Rapid-prototyping protection schemes with IEC 61850 + * + * Copyright (c) 2011 Steven Blair + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + #include "svDecodeBasic.h" #include "ied.h" #include "svDecode.h" @@ -7,93 +27,93 @@ void svDecodeASDU(unsigned char *buf, int len, int noASDU) { - unsigned char tag; // assumes only one byte is used - int lengthFieldSize; - int lengthValue; - int offsetForNonSequence; - unsigned char *svID = NULL; - int svIDLength = 0; + unsigned char tag; // assumes only one byte is used + int lengthFieldSize; + int lengthValue; + int offsetForNonSequence; + unsigned char *svID = NULL; + int svIDLength = 0; - int i = 0; - for (i = 0; i < len;) { - tag = (unsigned char) buf[i]; - lengthFieldSize = getLengthFieldSize((unsigned char) buf[i + 1]); - lengthValue = decodeLength((unsigned char *) &buf[i + 1]); - offsetForNonSequence = 1 + lengthFieldSize + lengthValue; + int i = 0; + for (i = 0; i < len;) { + tag = (unsigned char) buf[i]; + lengthFieldSize = getLengthFieldSize((unsigned char) buf[i + 1]); + lengthValue = decodeLength((unsigned char *) &buf[i + 1]); + offsetForNonSequence = 1 + lengthFieldSize + lengthValue; - //printf("\ttag: %x, noASDU: %u, lengthFieldSize: %i, lengthValue: %i, offset: %i\n", tag, noASDU, lengthFieldSize, lengthValue, offsetForNonSequence); + //printf("\ttag: %x, noASDU: %u, lengthFieldSize: %i, lengthValue: %i, offset: %i\n", tag, noASDU, lengthFieldSize, lengthValue, offsetForNonSequence); - switch (tag) { - case 0x80: - svID = &buf[i + 1 + lengthFieldSize]; - svIDLength = lengthValue; - break; - case 0x81: + switch (tag) { + case 0x80: + svID = &buf[i + 1 + lengthFieldSize]; + svIDLength = lengthValue; + break; + case 0x81: - break; - case 0x82: - // TODO: may be useful to store smpCnt value - break; - case 0x83: + break; + case 0x82: + // TODO: may be useful to store smpCnt value + break; + case 0x83: - break; - case 0x84: + break; + case 0x84: - break; - case 0x85: + break; + case 0x85: - break; - case 0x86: + break; + case 0x86: - break; - case 0x87: - if (svID != NULL) { - svDecodeDataset(&buf[i + 1 + lengthFieldSize], lengthValue, noASDU, svID, svIDLength); - } - break; - default: - break; - } + break; + case 0x87: + if (svID != NULL) { + svDecodeDataset(&buf[i + 1 + lengthFieldSize], lengthValue, noASDU, svID, svIDLength); + } + break; + default: + break; + } - i += offsetForNonSequence; - } + i += offsetForNonSequence; + } } void svDecodeAPDU(unsigned char *buf, int len) { - unsigned char tag = (unsigned char) buf[0]; // assumes only one byte is used - int lengthFieldSize = getLengthFieldSize((unsigned char) buf[1]); - int lengthValue = decodeLength((unsigned char *) &buf[1]); - int offsetForSequence = 1 + lengthFieldSize; - int offsetForNonSequence = 1 + lengthFieldSize + lengthValue; - //static unsigned int noASDU = 0; - static unsigned int ASDU = 0; + unsigned char tag = (unsigned char) buf[0]; // assumes only one byte is used + int lengthFieldSize = getLengthFieldSize((unsigned char) buf[1]); + int lengthValue = decodeLength((unsigned char *) &buf[1]); + int offsetForSequence = 1 + lengthFieldSize; + int offsetForNonSequence = 1 + lengthFieldSize + lengthValue; + //static unsigned int noASDU = 0; + static unsigned int ASDU = 0; - //printf("tag: %x, noASDU: %u, lengthFieldSize: %i, lengthValue: %i, offset: %i\n", tag, noASDU, lengthFieldSize, lengthValue, offsetForNonSequence); + //printf("tag: %x, noASDU: %u, lengthFieldSize: %i, lengthValue: %i, offset: %i\n", tag, noASDU, lengthFieldSize, lengthValue, offsetForNonSequence); - switch (tag) { - case 0x60: - svDecodeAPDU(&buf[offsetForSequence], lengthValue); - break; - case 0x80: - //noASDU = (unsigned int) buf[1 + lengthFieldSize]; // assuming noASDU is < 126 - ASDU = 0; - svDecodeAPDU(&buf[offsetForNonSequence], len - offsetForNonSequence); - break; - case 0xA2: - svDecodeAPDU(&buf[offsetForSequence], lengthValue); - break; - case 0x30: - svDecodeASDU(&buf[offsetForSequence], lengthValue, ASDU++); + switch (tag) { + case 0x60: + svDecodeAPDU(&buf[offsetForSequence], lengthValue); + break; + case 0x80: + //noASDU = (unsigned int) buf[1 + lengthFieldSize]; // assuming noASDU is < 126 + ASDU = 0; + svDecodeAPDU(&buf[offsetForNonSequence], len - offsetForNonSequence); + break; + case 0xA2: + svDecodeAPDU(&buf[offsetForSequence], lengthValue); + break; + case 0x30: + svDecodeASDU(&buf[offsetForSequence], lengthValue, ASDU++); - svDecodeAPDU(&buf[offsetForNonSequence], len - offsetForNonSequence); - break; - default: - break; - } + svDecodeAPDU(&buf[offsetForNonSequence], len - offsetForNonSequence); + break; + default: + break; + } } void svDecode(unsigned char *buf, int len) { - unsigned short APDULength = ((buf[21] << 8) | buf[22]) - 8; // must use length in PDU because total bytes (len) may contain CRC + unsigned short APDULength = ((buf[21] << 8) | buf[22]) - 8; // must use length in PDU because total bytes (len) may contain CRC - svDecodeAPDU(&buf[26], APDULength); // cuts out frame header (fixed size of 26 bytes before start of APDU) + svDecodeAPDU(&buf[26], APDULength); // cuts out frame header (fixed size of 26 bytes before start of APDU) }