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: decodePacket.c
- Revision:
- 1:9399d44c2b1a
- Parent:
- 0:230c10b228ea
--- a/decodePacket.c Fri Oct 07 13:41:08 2011 +0000
+++ b/decodePacket.c Fri Oct 07 13:48:18 2011 +0000
@@ -1,32 +1,52 @@
+/**
+ * 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 "decodePacket.h"
//#include "svEncodeBasic.h"
// returns size of length field, from first byte
int getLengthFieldSize(unsigned char byte) {
- if (byte <= 126) {
- return 1;
- }
- else {
- return 1 + (byte & 0x7F);
- }
+ if (byte <= 126) {
+ return 1;
+ }
+ else {
+ return 1 + (byte & 0x7F);
+ }
}
-//TODO check this works for all inputs, e.g., buf[1] = 0xFF
+//TODO check this works for all inputs, e.g., buf[1] = 0xFF
int decodeLength(unsigned char *buf) {
- if (buf[0] <= 126) {
- return buf[0];
- }
- else {
- int bytes = (buf[0] & 0x7F);
+ if (buf[0] <= 126) {
+ return buf[0];
+ }
+ else {
+ int bytes = (buf[0] & 0x7F);
- if (bytes == 1) {
- return buf[1];
- }
- else if (bytes == 2) { // assumes max length of 2^15
- return ((buf[1] & 0xFF) << 8) | (buf[2] & 0xFF);
- }
- }
+ if (bytes == 1) {
+ return buf[1];
+ }
+ else if (bytes == 2) { // assumes max length of 2^15
+ return ((buf[1] & 0xFF) << 8) | (buf[2] & 0xFF);
+ }
+ }
- return 0;
+ return 0;
}