Here's what I'm seeing, correct me if I'm wrong.
The CC2420BaseStation receives messages over the radio
through CC2420ActiveMessageC's Receive interface. This
interface goes through an address check before delivery:
if (call AMPacket.isForMe(msg)) {
return signal Receive.receive[call
AMPacket.type(msg)](msg, payload, len - CC2420_SIZE);
} ...
In my local version of CC2420BaseStation, I made a copy of
CC2420ActiveMessageP.nc into the CC2420BaseStation
directory and removed this check.
Note that connecting the base station to the snoop
interface isn't what you want either - then you receive
every message except messages destined for the base
station's address.
-David
On Tue, 30 Jan 2007 08:29:03 -0800
Philip Levis <[EMAIL PROTECTED]> wrote:
On Jan 30, 2007, at 6:40 AM, Alban Hessler wrote:
Hi everyone,
We have found a small bug in the file CC2240ControlP.nc
for the
BaseStationCC2420 application of T2.
In order to be a sniffer (that's what BaseStation is
according to
the readme), the BaseStation should disable the address
filtering
of the CC2420. For that to be done, it must explicitly
set the bit
to 0 in the registry, as the default reset value is 1.
(datasheet
of CC2420, p.65)
So the code to set the configuration register in
CC2240ControlP.nc
should be the following:
call MDMCTRL0.write( (( 1 <<
CC2420_MDMCTRL0_RESERVED_FRAME_MODE ) |
( 2 << CC2420_MDMCTRL0_CCA_HYST ) |
( 3 << CC2420_MDMCTRL0_CCA_MOD ) |
( 1 << CC2420_MDMCTRL0_AUTOCRC ) |
( 2 << CC2420_MDMCTRL0_PREAMBLE_LENGTH )) &
~( 1 << CC2420_MDMCTRL0_ADR_DECODE));
Notice the added mask at the end of the instruction.
Best Regards,
Alban Hessler & Evgeny Osipov
This isn't necessary. It's not a read-modify-write of
the register, just a plain write.
Phil
_______________________________________________
Tinyos-help mailing list
[email protected]
https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
_______________________________________________
Tinyos-help mailing list
[email protected]
https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
