[Tinyos-help] : Is it possible to communicate between Tinyos 1.x and Tinyos 2.x via ridio?
Eric Decker
cire831 at gmail.com
Mon Sep 8 10:43:09 PDT 2008
All paths are from the top of a current T2 source tree:
tos/types/message.h contains the structure that pulls all the pieces
together.
# 19 "/Users/cire/mm_t2/t2_cur/tinyos-2.x/tos/types/message.h"
typedef nx_struct message_t {
nx_uint8_t header[sizeof(message_header_t )];
nx_uint8_t data[28];
nx_uint8_t footer[sizeof(message_footer_t )];
nx_uint8_t metadata[sizeof(message_metadata_t )];
} __attribute__((packed)) message_t;
The header pieces are a union defined in platform_message.h. I have a
platform
called mm3 which is almost identical to the telosb (telosa is what contains
the
platform_message.h file).
# 48 "/Users/cire/mm_t2/t2_mm3/tos/platforms/mm3/platform_message.h"
#line 45
typedef union message_header {
cc2420_header_t cc2420;
serial_header_t serial;
} message_header_t;
typedef union TOSRadioFooter {
cc2420_footer_t cc2420;
} message_footer_t;
#line 54
typedef union TOSRadioMetadata {
cc2420_metadata_t cc2420;
serial_metadata_t serial;
} message_metadata_t;
For the radio part we see:
# 39 "/Users/cire/mm_t2/t2_cur/tinyos-2.x/tos/chips/cc2420/CC2420.h"
typedef uint8_t cc2420_status_t;
#line 66
#line 49
typedef nx_struct cc2420_header_t {
nxle_uint8_t length;
nxle_uint16_t fcf;
nxle_uint8_t dsn;
nxle_uint16_t destpan;
nxle_uint16_t dest;
nxle_uint16_t src;
nxle_uint8_t network;
nxle_uint8_t type;
} __attribute__((packed))
cc2420_header_t;
#line 71
typedef nx_struct cc2420_footer_t {
} __attribute__((packed)) cc2420_footer_t;
#line 97
#line 81
typedef nx_struct cc2420_metadata_t {
nx_uint8_t rssi;
nx_uint8_t lqi;
nx_uint8_t tx_power;
nx_bool crc;
nx_bool ack;
nx_bool timesync;
nx_uint32_t timestamp;
nx_uint16_t rxInterval;
} __attribute__((packed))
For the serial part we see:
# 72 "/Users/cire/mm_t2/t2_cur/tinyos-2.x/tos/lib/serial/Serial.h"
#line 112
typedef nx_struct serial_header {
nx_am_addr_t dest;
nx_am_addr_t src;
nx_uint8_t length;
nx_am_group_t group;
nx_am_id_t type;
} __attribute__((packed)) serial_header_t;
#line 120
typedef nx_struct serial_packet {
serial_header_t header;
nx_uint8_t data[];
} __attribute__((packed)) serial_packet_t;
#line 125
typedef nx_struct serial_metadata {
nx_uint8_t ack;
} __attribute__((packed)) serial_metadata_t;
2008/9/7 Michael Schippling <schip at santafe.edu>
> OK I found TEP 111 http://www.tinyos.net/tinyos-2.x/doc/html/tep111.html
> which does a nice job of explaining why we "need" so many levels
> of data obfuscation, but doesn't actually show what the final
> structs are and what's the difference. I presume the 2420 headers
> must be identical because they are part of 802.11.14 (I think...).
> It's hard to imagine that the low level radio code would need (much)
> massaging in order to make T1&2 compatible for a one-off system.
>
> Since I'm not now nor ever have been a T2'er, could someone post
> or point to the two structs for me?
>
> thanks
> MS
>
> Eric Decker wrote:
> >
> >
> > 2008/9/7 Renee Azhen <azhen_renee at yahoo.com.cn
> > <mailto:azhen_renee at yahoo.com.cn>>
> >
> > yep, Eric, I want to communicate by radio.
> > In T2, the message format_t is named msaage_t, and in T1, it is
> > named TOS_msg, and it is almost different. So each nodes in
> > different T# can't analyze other type radio message as expected.
> >
> >
> > Not sure what you mean by "almost different". Slightly different?
> >
> >
> > Can we revise the code in the mac-lay of T2 to receive and analysze
> > radio message send by T1 node?
> >
> >
> > It is possible. It would have to be done at a fairly low level in the
> > stack. My gut feeling is you'd be biting
> > off a lot. Asking for lots of problems.
> >
> > What problem are you trying to solve? In other words what are you
> > trying to do with the node that
> > is communicating using the T1 stack?
> >
> >
> > Can we move on by some other method to resolve this problem, then
> > let them communicate between different platform. Or definitely no
> way?
> >
> >
> > A different approach would be to build a T1-T2 gateway. A node that has
> > two radios or possibly one radio
> > attached to two stacks. But this too seems like more trouble then it is
> > worth.
> >
> >
> >
> > thanks
> > zhijian
> > */Eric Decker <cire831 at gmail.com <mailto:cire831 at gmail.com>>/* 写道：
> >
> > Communicate in what way? Using the radio?
> >
> > It is my understanding that there is a small difference between
> > the packet format in
> > T2 vs. T1. I would recommend looking at message_t for the
> > communications medium
> > used for T2. I don't remember what the packet structure is
> > called in T1 but that is
> > what you want to compare against.
> >
> > That is where I would start.
> >
> > eric
> >
> >
> > 2008/9/6 Renee Azhen <azhen_renee at yahoo.com.cn
> > <mailto:azhen_renee at yahoo.com.cn>>
> >
> > hi, all,
> > Most of my nodes are programed with tinyos 2.0, but there is
> > a message sender is programed with tinyos 1.x.
> >
> > It is possble to let the nodes with tinyos 2.0 receive the
> > msg sent by tinyos 1.x??
> > thanks
> > zhijian
> >
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> >
> >
> >
> > --
> > Eric B. Decker
> > Senior (over 50 :-) Researcher
> > Autonomous Systems Lab
> > Jack Baskin School of Engineering
> > UCSC
> >
> >
> >
> ------------------------------------------------------------------------
> > 雅虎邮箱，您的终生邮箱！ <http://cn.mail.yahoo.com/>
> >
> >
> >
> >
> > --
> > Eric B. Decker
> > Senior (over 50 :-) Researcher
> > Autonomous Systems Lab
> > Jack Baskin School of Engineering
> > UCSC
> >
> >
> > ------------------------------------------------------------------------
> >
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--
Eric B. Decker
Senior (over 50 :-) Researcher
Autonomous Systems Lab
Jack Baskin School of Engineering
UCSC
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