Hi!
On Thu, 29 Oct 2009, Arik Sapojnik wrote:
Hey,
Thanks Michael, it it strange though that I couldn't find this description
elsewhere...
So the CC2420 radio has it's own microcontroller which can parse the packets
without the CPU intervention?
I highly recommend taking a look at the CC2420 Datasheet:
http://focus.ti.com/lit/ds/symlink/cc2420.pdf
The CC2420 is capable of packet buffering, address filtering and auto
acking a packet. The communication between the MCU and the CC2420 takes
places over SPI bus plus a few signal lines (some capable to
generate an interrupt on the MCU).
--
Razvan ME
----- Original Message -----
From: Michael Schippling <sc...@santafe.edu>
Date: Thursday, October 29, 2009 18:48
Subject: Re: [Tinyos-help] TinyOS Receive mechanism
To: Arik <ari...@bgu.ac.il>
Cc: tinyos-help@millennium.berkeley.edu
I can't say as I know HOW it works but the general idea
is that the radio, in normal non-low-power use, listens
to the channel and grabs all messages. If the message
is received cleanly, belongs to the GroupID of the node,
and the destination matches it's NodeID or BCAST it is
passed to the AM dispatcher which calls the receive()
method defined in your config file for the message's AM
type value.
Thus the packet "just pops out" into the right function.
There isn't really a TOS scheduler as such. Tasks are executed
in a sequential manner, when one returns the next one is started.
Interrupts can break into a task and wreck havoc as they desire,
but tasks are not timesliced or anything fancy.
MS
Arik wrote:
Hi all,
Does anybody know how the Receive .receive works?
I mean when I send a message, I use AMSend.Send(), but I don't do the
same for the receiver side.
The packet just "pops out" into the Receive.receive().
Does TinyOS always listens to the channel when the radio is not
transmitting?
What happens between AMSend.SendDone() and Receive.receive()?
Where in general I look into TinyOS scheduler?
Thanks,
Arik
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