Hello;
As part of my work with TinyOS and a TelosB board, I am looking to implement
the AFDX protocol (mainly used in aviation communications). I have defined
and structured the packet and was hoping I could get some possible pointers
or tips. I haven't really got down to coding the actual TinyOS application
or implementation yet, but I have started with my AFDXProtocol.h file which
will define the various structures embedded in my packet. I was wondering
if someone could take a look at my "AFDXMessage" struct and let me know if I
am on the right track. Also, my question is exactly how a packet like this
would be transferred. Would the AFDXMessage struct be cast as a message_t
as a whole, or will we only be transmitting the data payload? Thanks for
the help guys.
/**
* Header file for the AFDX Protocol under TinyOS
*
* @Author Paimon Sorornejad, 2/9/2011
* @Version 1.0.0
*/
typedef nx_struct preamble{
uint8_t value; // 7 preamble + 1 version
} preamble;
typedef nx_struct macDest{
static const uint32_t start = 0x03000000;
uint16_t VLI;
} macDest;
typedef nx_struct macSource{
static const uint16_t constField = 0x0200;
static const uint8_t networkStart = 0x00;
uint8_t networkId;
uint8_t equipmentId;
uint8_t interfaceId;
} macSource;
typedef nx_struct macHeader{
macDest dest;
macSource source;
} macHeader;
typedef nx_struct ipSource{
static const uint8_t = 00001010;
uint8_t networkid;
uint8_t equipmentid;
uint8_t partitionid;
} ipSource;
typedef nx_struct ipDestination{
uint16_t start = 0xE0C0;
uint16_t int VLI;
} ipDestination;
typedef nx_struct ipHeader{
uint8_t ip_version;
uint8_t ip_tos;
uint16_t ip_len;
uint16_t ip_id;
uint16_t ip_off;
uint8_t ip_ttl;
uint8_t ip_proto;
uint16_t ip_sum;
ipSource ip_src;
ipDestination ip_dst;
} ipheader;
typedef nx_struct udpHeader{
uint16_t source;
uint16_t dest;
uint16_t udplen;
uint16_t udpchk;
} udpHeader;
typedef nx_struct sequence{
uint8_t value; // 8 bit (1byte)
} sequence;
typedef nx_struct fcs{
uint32_t value; // 32 bit (4byte)
} fcs;
typedef nx_struct AFDXMessage {
preamble pre;
macHeader mac;
ipHeader ip;
udpHeader udp;
uint8_t data[TOSH_DATA_LENGTH]
sequence seq;
fcs fc;
} AFDXMessage;
Paimon Sorornejad
Email: [email protected] | Cell: 781-205-9876
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