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/
Diff: gseDecodePacket.c
- Revision:
- 0:230c10b228ea
- Child:
- 1:9399d44c2b1a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gseDecodePacket.c Fri Oct 07 13:41:08 2011 +0000
@@ -0,0 +1,54 @@
+#include "gseDecodeBasic.h"
+#include "ied.h"
+#include "gseDecode.h"
+#include "gsePacketData.h"
+#include "decodePacket.h"
+#include <stddef.h>
+
+
+
+//temp
+//#include <stdio.h>
+//#include <stdlib.h>
+
+
+
+unsigned char datasetName[65] = {0}; // maximum length of 65 bytes
+CTYPE_INT16U datasetNameLength = 0;
+
+
+void gseDecodePDU(unsigned char *buf) {
+ unsigned char tag = (unsigned char) buf[0]; // assumes only one byte is used
+ CTYPE_INT16U lengthFieldSize = getLengthFieldSize((unsigned char) buf[1]);
+ CTYPE_INT16U lengthValue = decodeLength((unsigned char *) &buf[1]);
+ CTYPE_INT16U offsetForSequence = 1 + lengthFieldSize;
+ CTYPE_INT16U offsetForNonSequence = 1 + lengthFieldSize + lengthValue;
+
+ //printf("tag: %x, lengthFieldSize: %i, lengthValue: %i, offset: %i\n", tag, lengthFieldSize, lengthValue, offsetForNonSequence);
+
+ switch (tag) {
+ case 0x61:
+ gseDecodePDU(&buf[offsetForSequence]);
+ break;
+ case 0x82:
+ // save dataset name
+ memcpy(datasetName, &buf[offsetForSequence], lengthValue);
+ datasetNameLength = lengthValue;
+ //printf("%s, %d\n", datasetName, datasetNameLength);
+ //fflush(stdout);
+
+ gseDecodePDU(&buf[offsetForNonSequence]);
+ break;
+ case 0xAB:
+ gseDecodeDataset(&buf[offsetForSequence], lengthValue, datasetName, datasetNameLength);
+ return;
+ //break;
+ default:
+ gseDecodePDU(&buf[offsetForNonSequence]);
+ break;
+ }
+}
+
+void gseDecode(unsigned char *buf, int len) {
+ gseDecodePDU(&buf[26]); // cuts out frame header (fixed size of 26 bytes before start of APDU)
+}