Steven Blair
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/
svDecodePacket.c@0:230c10b228ea, 2011-10-07 (annotated)
- Committer:
- sblair
- Date:
- Fri Oct 07 13:41:08 2011 +0000
- Revision:
- 0:230c10b228ea
- Child:
- 1:9399d44c2b1a
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| sblair | 0:230c10b228ea | 1 | #include "svDecodeBasic.h" |
| sblair | 0:230c10b228ea | 2 | #include "ied.h" |
| sblair | 0:230c10b228ea | 3 | #include "svDecode.h" |
| sblair | 0:230c10b228ea | 4 | #include "svPacketData.h" |
| sblair | 0:230c10b228ea | 5 | #include "decodePacket.h" |
| sblair | 0:230c10b228ea | 6 | #include <stddef.h> |
| sblair | 0:230c10b228ea | 7 | |
| sblair | 0:230c10b228ea | 8 | |
| sblair | 0:230c10b228ea | 9 | void svDecodeASDU(unsigned char *buf, int len, int noASDU) { |
| sblair | 0:230c10b228ea | 10 | unsigned char tag; // assumes only one byte is used |
| sblair | 0:230c10b228ea | 11 | int lengthFieldSize; |
| sblair | 0:230c10b228ea | 12 | int lengthValue; |
| sblair | 0:230c10b228ea | 13 | int offsetForNonSequence; |
| sblair | 0:230c10b228ea | 14 | unsigned char *svID = NULL; |
| sblair | 0:230c10b228ea | 15 | int svIDLength = 0; |
| sblair | 0:230c10b228ea | 16 | |
| sblair | 0:230c10b228ea | 17 | int i = 0; |
| sblair | 0:230c10b228ea | 18 | for (i = 0; i < len;) { |
| sblair | 0:230c10b228ea | 19 | tag = (unsigned char) buf[i]; |
| sblair | 0:230c10b228ea | 20 | lengthFieldSize = getLengthFieldSize((unsigned char) buf[i + 1]); |
| sblair | 0:230c10b228ea | 21 | lengthValue = decodeLength((unsigned char *) &buf[i + 1]); |
| sblair | 0:230c10b228ea | 22 | offsetForNonSequence = 1 + lengthFieldSize + lengthValue; |
| sblair | 0:230c10b228ea | 23 | |
| sblair | 0:230c10b228ea | 24 | //printf("\ttag: %x, noASDU: %u, lengthFieldSize: %i, lengthValue: %i, offset: %i\n", tag, noASDU, lengthFieldSize, lengthValue, offsetForNonSequence); |
| sblair | 0:230c10b228ea | 25 | |
| sblair | 0:230c10b228ea | 26 | switch (tag) { |
| sblair | 0:230c10b228ea | 27 | case 0x80: |
| sblair | 0:230c10b228ea | 28 | svID = &buf[i + 1 + lengthFieldSize]; |
| sblair | 0:230c10b228ea | 29 | svIDLength = lengthValue; |
| sblair | 0:230c10b228ea | 30 | break; |
| sblair | 0:230c10b228ea | 31 | case 0x81: |
| sblair | 0:230c10b228ea | 32 | |
| sblair | 0:230c10b228ea | 33 | break; |
| sblair | 0:230c10b228ea | 34 | case 0x82: |
| sblair | 0:230c10b228ea | 35 | // TODO: may be useful to store smpCnt value |
| sblair | 0:230c10b228ea | 36 | break; |
| sblair | 0:230c10b228ea | 37 | case 0x83: |
| sblair | 0:230c10b228ea | 38 | |
| sblair | 0:230c10b228ea | 39 | break; |
| sblair | 0:230c10b228ea | 40 | case 0x84: |
| sblair | 0:230c10b228ea | 41 | |
| sblair | 0:230c10b228ea | 42 | break; |
| sblair | 0:230c10b228ea | 43 | case 0x85: |
| sblair | 0:230c10b228ea | 44 | |
| sblair | 0:230c10b228ea | 45 | break; |
| sblair | 0:230c10b228ea | 46 | case 0x86: |
| sblair | 0:230c10b228ea | 47 | |
| sblair | 0:230c10b228ea | 48 | break; |
| sblair | 0:230c10b228ea | 49 | case 0x87: |
| sblair | 0:230c10b228ea | 50 | if (svID != NULL) { |
| sblair | 0:230c10b228ea | 51 | svDecodeDataset(&buf[i + 1 + lengthFieldSize], lengthValue, noASDU, svID, svIDLength); |
| sblair | 0:230c10b228ea | 52 | } |
| sblair | 0:230c10b228ea | 53 | break; |
| sblair | 0:230c10b228ea | 54 | default: |
| sblair | 0:230c10b228ea | 55 | break; |
| sblair | 0:230c10b228ea | 56 | } |
| sblair | 0:230c10b228ea | 57 | |
| sblair | 0:230c10b228ea | 58 | i += offsetForNonSequence; |
| sblair | 0:230c10b228ea | 59 | } |
| sblair | 0:230c10b228ea | 60 | } |
| sblair | 0:230c10b228ea | 61 | |
| sblair | 0:230c10b228ea | 62 | void svDecodeAPDU(unsigned char *buf, int len) { |
| sblair | 0:230c10b228ea | 63 | unsigned char tag = (unsigned char) buf[0]; // assumes only one byte is used |
| sblair | 0:230c10b228ea | 64 | int lengthFieldSize = getLengthFieldSize((unsigned char) buf[1]); |
| sblair | 0:230c10b228ea | 65 | int lengthValue = decodeLength((unsigned char *) &buf[1]); |
| sblair | 0:230c10b228ea | 66 | int offsetForSequence = 1 + lengthFieldSize; |
| sblair | 0:230c10b228ea | 67 | int offsetForNonSequence = 1 + lengthFieldSize + lengthValue; |
| sblair | 0:230c10b228ea | 68 | //static unsigned int noASDU = 0; |
| sblair | 0:230c10b228ea | 69 | static unsigned int ASDU = 0; |
| sblair | 0:230c10b228ea | 70 | |
| sblair | 0:230c10b228ea | 71 | //printf("tag: %x, noASDU: %u, lengthFieldSize: %i, lengthValue: %i, offset: %i\n", tag, noASDU, lengthFieldSize, lengthValue, offsetForNonSequence); |
| sblair | 0:230c10b228ea | 72 | |
| sblair | 0:230c10b228ea | 73 | switch (tag) { |
| sblair | 0:230c10b228ea | 74 | case 0x60: |
| sblair | 0:230c10b228ea | 75 | svDecodeAPDU(&buf[offsetForSequence], lengthValue); |
| sblair | 0:230c10b228ea | 76 | break; |
| sblair | 0:230c10b228ea | 77 | case 0x80: |
| sblair | 0:230c10b228ea | 78 | //noASDU = (unsigned int) buf[1 + lengthFieldSize]; // assuming noASDU is < 126 |
| sblair | 0:230c10b228ea | 79 | ASDU = 0; |
| sblair | 0:230c10b228ea | 80 | svDecodeAPDU(&buf[offsetForNonSequence], len - offsetForNonSequence); |
| sblair | 0:230c10b228ea | 81 | break; |
| sblair | 0:230c10b228ea | 82 | case 0xA2: |
| sblair | 0:230c10b228ea | 83 | svDecodeAPDU(&buf[offsetForSequence], lengthValue); |
| sblair | 0:230c10b228ea | 84 | break; |
| sblair | 0:230c10b228ea | 85 | case 0x30: |
| sblair | 0:230c10b228ea | 86 | svDecodeASDU(&buf[offsetForSequence], lengthValue, ASDU++); |
| sblair | 0:230c10b228ea | 87 | |
| sblair | 0:230c10b228ea | 88 | svDecodeAPDU(&buf[offsetForNonSequence], len - offsetForNonSequence); |
| sblair | 0:230c10b228ea | 89 | break; |
| sblair | 0:230c10b228ea | 90 | default: |
| sblair | 0:230c10b228ea | 91 | break; |
| sblair | 0:230c10b228ea | 92 | } |
| sblair | 0:230c10b228ea | 93 | } |
| sblair | 0:230c10b228ea | 94 | |
| sblair | 0:230c10b228ea | 95 | void svDecode(unsigned char *buf, int len) { |
| sblair | 0:230c10b228ea | 96 | unsigned short APDULength = ((buf[21] << 8) | buf[22]) - 8; // must use length in PDU because total bytes (len) may contain CRC |
| sblair | 0:230c10b228ea | 97 | |
| sblair | 0:230c10b228ea | 98 | svDecodeAPDU(&buf[26], APDULength); // cuts out frame header (fixed size of 26 bytes before start of APDU) |
| sblair | 0:230c10b228ea | 99 | } |