Add support for IEEE 802.15.4e Information Elements (IEs). All IEs used by TSCH are currently included.

2015-09-21 18:49:31 +02:00 · 2015-09-21 18:49:31 +02:00 · ecba49c282
commit ecba49c282
parent 5cf9871d5b
5 changed files with 1088 additions and 0 deletions
--- a/core/net/mac/tsch/tsch-asn.h
+++ b/core/net/mac/tsch/tsch-asn.h
@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2015, SICS Swedish ICT.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ */
+
+/**
+ * \file
+ *         TSCH 5-Byte Absolute Slot Number (ASN) management
+ * \author
+ *         Simon Duquennoy <simonduq@sics.se>
+ *
+ */
+
+#ifndef __TSCH_ASN_H__
+#define __TSCH_ASN_H__
+
+/************ Types ***********/
+
+/* The ASN is an absolute slot number over 5 bytes. */
+struct asn_t {
+  uint32_t ls4b; /* least significant 4 bytes */
+  uint8_t  ms1b; /* most significant 1 byte */
+};
+
+/* For quick modulo operation on ASN */
+struct asn_divisor_t {
+  uint16_t val; /* Divisor value */
+  uint16_t asn_ms1b_remainder; /* Remainder of the operation 0x100000000 / val */
+};
+
+/************ Macros **********/
+
+/* Initialize ASN */
+#define ASN_INIT(asn, ms1b_, ls4b_) do { \
+    (asn).ms1b = (ms1b_); \
+    (asn).ls4b = (ls4b_); \
+} while(0);
+
+/* Increment an ASN by inc (32 bits) */
+#define ASN_INC(asn, inc) do { \
+    uint32_t new_ls4b = (asn).ls4b + (inc); \
+    if(new_ls4b < (asn).ls4b) { (asn).ms1b++; } \
+    (asn).ls4b = new_ls4b; \
+} while(0);
+
+/* Decrement an ASN by inc (32 bits) */
+#define ASN_DEC(asn, dec) do { \
+    uint32_t new_ls4b = (asn).ls4b - (dec); \
+    if(new_ls4b > (asn).ls4b) { (asn).ms1b--; } \
+    (asn).ls4b = new_ls4b; \
+} while(0);
+
+/* Returns the 32-bit diff between asn1 and asn2 */
+#define ASN_DIFF(asn1, asn2) \
+  ((asn1).ls4b - (asn2).ls4b)
+
+/* Initialize a struct asn_divisor_t */
+#define ASN_DIVISOR_INIT(div, val_) do { \
+    (div).val = (val_); \
+    (div).asn_ms1b_remainder = ((0xffffffff % (val_)) + 1) % (val_); \
+} while(0);
+
+/* Returns the result (16 bits) of a modulo operation on ASN,
+ * with divisor being a struct asn_divisor_t */
+#define ASN_MOD(asn, div) \
+  ((uint16_t)((asn).ls4b % (div).val) \
+   + (uint16_t)((asn).ms1b * (div).asn_ms1b_remainder % (div).val)) \
+  % (div).val
+
+#endif /* __TSCH_ASN_H__ */