nes-proj/cpu/avr/radio/rf230/frame.h

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/*
* Copyright (c) 2008, Swedish Institute of Computer Science
* All rights reserved.
*
* Additional fixes for AVR contributed by:
* Colin O'Flynn coflynn@newae.com
* Eric Gnoske egnoske@gmail.com
* Blake Leverett bleverett@gmail.com
* Mike Vidales mavida404@gmail.com
* Kevin Brown kbrown3@uccs.edu
* Nate Bohlmann nate@elfwerks.com
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
/**
* \addtogroup frame
* @{
*/
/**
* \file
* \brief 802.15.4 frame creation and parsing functions
*
* This file converts to and from a structure to a packed 802.15.4
* frame.
*
*/
/* Includes */
#ifndef FRAME_UTILS_H
#define FRAME_UTILS_H
#include "hal.h"
/* Macros & Defines */
/**
* \brief Defines the bitfields of the frame control field (FCF).
*/
typedef union{
/** \brief Structure of bitfields for the FCF */
struct{
uint8_t frameType : 3; /**< Frame type field, see 802.15.4 */
bool securityEnabled : 1; /**< True if security is used in this frame */
bool framePending : 1; /**< True if sender has more data to send */
bool ackRequired : 1; /**< Is an ack frame required? */
bool panIdCompression : 1; /**< Is this a compressed header? */
uint8_t reserved : 3; /**< Unused bits */
uint8_t destAddrMode : 2; /**< Destination address mode, see 802.15.4 */
uint8_t frameVersion : 2; /**< 802.15.4 frame version */
uint8_t srcAddrMode : 2; /**< Source address mode, see 802.15.4 */
};
uint16_t word_val; /**< A word-wide value for the entire FCF */
}fcf_t;
/**
* \brief Structure that contains the lengths of the various addressing and security fields
* in the 802.15.4 header. This structure is used in \ref frame_tx_create()
*/
typedef struct{
uint8_t dest_pid_len; /**< Length (in bytes) of destination PAN ID field */
uint8_t dest_addr_len; /**< Length (in bytes) of destination address field */
uint8_t src_pid_len; /**< Length (in bytes) of source PAN ID field */
uint8_t src_addr_len; /**< Length (in bytes) of source address field */
uint8_t aux_sec_len; /**< Length (in bytes) of aux security header field */
} field_length_t;
/** \brief 802.15.4 security control bitfield. See section 7.6.2.2.1 in 802.15.4 specification */
typedef struct{
uint8_t security_level : 3; /**< security level */
uint8_t key_id_mode : 2; /**< Key identifier mode */
uint8_t reserved : 3; /**< Reserved bits */
} scf_t;
/** \brief 802.15.4 Aux security header */
typedef struct{
scf_t security_control; /**< Security control bitfield */
uint32_t frame_counter; /**< Frame counter, used for security */
uint8_t key[9]; /**< The key itself, or an index to the key */
} aux_hdr_t;
/**
* @brief Some constants for frame length calculations.
* The IEEE 802.15.4 frame has a number of constant/fixed fields that
* can be counted to make frame construction and max payload
* calculations easier.
*
* These include:
* 1. FCF - 2 bytes - Fixed
* 2. Sequence number - 1 byte - Fixed
* 3. Addressing fields - 4 - 20 bytes - Variable
* 4. Aux security header - 0 - 14 bytes - Variable
* 5. CRC - 2 bytes - Fixed
*/
#define FIXEDFRAMEOVERHEAD (5)
/** \brief A union of short and long address types. Although a node can have
* both long and short addresses a frame will contain
* only one of these. Therefore, a union is appropriate here. */
typedef union{
uint16_t shortAddr; /**< Short address, two bytes */
uint64_t longAddr; /**< Long address, eight bytes */
}ADDR_SIZE_SPEC_t;
/** \brief Structure containing a PAN ID and an address */
typedef struct{
uint16_t panId; /**< PAN ID */
ADDR_SIZE_SPEC_t addrSpec; /**< A short or long address */
}PAN_ID_ADDR_SPEC_t;
/** \brief Structure containing both source and destination addresses */
typedef struct{
PAN_ID_ADDR_SPEC_t destAddrFields; /**< Destination address */
PAN_ID_ADDR_SPEC_t srcAddrFields; /**< Source address */
}ADDR_FIELD_SPEC_t;
/** \brief Union of both short and long addresses */
typedef union{
uint16_t addr16; /**< Short address */
uint64_t addr64; /**< Long address */
} addr_t;
/** \brief Strucure used to return that status of the frame create process.
* See frame_tx_create() function.*/
typedef struct{
uint8_t *frame; /**< Pointer to created frame */
uint8_t length; /**< Length (in bytes) of created frame */
} frame_result_t;
/** \brief Parameters used by the frame_tx_create() function. These
* parameters are used in the 802.15.4 frame header. See the 802.15.4
* specification for details.
*/
typedef struct{
fcf_t fcf; /**< Frame control field */
uint8_t seq; /**< Sequence number */
uint16_t dest_pid; /**< Destination PAN ID */
addr_t dest_addr; /**< Destination address */
uint16_t src_pid; /**< Source PAN ID */
addr_t src_addr; /**< Source address */
aux_hdr_t aux_hdr; /**< Aux security header */
uint8_t *payload; /**< Pointer to 802.15.4 frame payload */
uint8_t payload_len; /**< Length of payload field */
} frame_create_params_t;
typedef struct{
fcf_t * fcf; /**< The FCF of the frame. */
uint8_t * seqNum; /**< The sequence number of the frame. */
uint16_t * dest_pid; /**< Destination PAN ID. */
addr_t * dest_addr; /**< Destination address. */
uint16_t * src_pid; /**< PAN ID */
addr_t * src_addr; /**< Source address */
uint8_t * aux_sec_hdr; /**< 802.15.4 Aux security header */
uint8_t * payload; /**< Frame payload */
uint8_t payload_length; /**< Length of payload section of frame */
uint8_t lqi; /**< Link quality indication value */
uint8_t rssi; /**< Received signal strength indication value */
uint32_t time; /**< Time stamp of received frame */
bool fcs:1; /**< True if checksum has passed */
bool in_use:1; /**< Is this frame struct being used? */
} parsed_frame_t;
/* Globals */
//extern FRAME_t rx_frame;
/* Protoypes */
void frame_tx_create(frame_create_params_t *p,frame_result_t *frame_result);
void frame_rx_callback(uint16_t data);
void rx_frame_parse(hal_rx_frame_t *rx_frame, parsed_frame_t *pf);
/** @} */
#endif /* FRAME_UTILS_H */