[Tinyos-devel] 2.0.2 CC2420

[Chieh-Jan (Mike) Liang]

This is also what I am thinking.

Thanks

Mike

J. Ryan Stinnett wrote:
> Does this have any effect on snooping with CC2420?  Just to confirm, the 
> address recognition feature needs to be disabled as in BaseStationCC2420 
> before snooping will work, is that correct?
> 
> Thanks,
> Ryan
> 
> David Moss wrote:
>> Yup - there's a good reason for this.  The destination address is checked
>> automatically by hardware while receiving the packet transmission.  So by
>> the time the uC gets the signal that a new packet has arrived, the packet
>> has already gone through the address/pan check.  Therefore, we don't 
>> need a
>> second address check in software before issuing a SACK.
>>
>> -David
>>
>>
>> -----Original Message-----
>> From: David Moss [mailto:dmm at rincon.com] Sent: Tuesday, July 03, 2007 
>> 9:45 PM
>> To: 'Chieh-Jan (Mike) Liang'
>> Cc: 'tinyos-devel at Millennium.Berkeley.EDU'
>> Subject: RE: [Tinyos-devel] 2.0.2 CC2420
>>
>> Yup - there's a good reason for this.  The destination address is checked
>> automatically by hardware while receiving the packet transmission.  So by
>> the time the uC gets the signal that a new packet has arrived, the packet
>> has already gone through the address/pan check.  Therefore, we don't 
>> need a
>> second address check in software before issuing a SACK.
>>
>> -David
>>
>>
>>
>> -----Original Message-----
>> From: Chieh-Jan (Mike) Liang [mailto:cliang4 at cs.jhu.edu] Sent: 
>> Tuesday, July 03, 2007 7:41 PM
>> To: David Moss
>> Cc: tinyos-devel at Millennium.Berkeley.EDU
>> Subject: Re: [Tinyos-devel] 2.0.2 CC2420
>>
>> Something about SACK in the new CC2420 stack is not clear to me. In 
>> the old implementation, before SACK is strobed, the mote ID is 
>> compared with the packet destination address. However, this check is 
>> not performed any more. Is there any reason behind this?
>>
>> Thank you
>>
>> Mike
>>
>> David Moss wrote:
>>> Just updated the CC2420 stack in preparation for 2.0.2.  The file 
>>> architecture has been re-arranged a little bit, making it easier to 
>>> see how the stack is put together.  As a result, the .platform files 
>>> that reference the cc2420 were updated.
>>>  
>>>
>>> Test results are included. Let me know if you have any issues.
>>>
>>> -David
>>>
>>>  
>>>
>>>  
>>>
>>> Recent Updates (from the readme):
>>>
>>> * New chip SPI bus arbitration working with Receive and Transmit.
>>>
>>>  
>>>
>>> * Applied TUnit automated unit testing to CC2420 development
>>>
>>>   > Caught lots of bugs, especially through regression testing
>>>
>>>   > Source code in tinyos-2.x-contribs/tunit/
>>>
>>>  
>>>
>>> * Applied TEP115 behavior to CC2420 SplitControl in Csma and Lpl
>>>
>>>  
>>>
>>> * Updated ActiveMessageAddressC to provide the ActiveMessageAddress 
>>> interface
>>>
>>>   > Updated CC2420ConfigP to handle 
>>> ActiveMessageAddress.addressChanged() and
>>>
>>>     sync automatically upon address change events.
>>>
>>>  
>>>
>>> * Updated CC2420Config interface to enable/disable sw/hw 
>>> acknowledgements
>>>
>>>  
>>>
>>> * Updated CC2420ConfigP to share register editing through single 
>>> functions
>>>
>>>  
>>>
>>> * Acknowledge after packet length and FCF check out valid.
>>>   > The destination address is confirmed in hardware, so we don't need
>>>
>>>     to download the entire header before acking.
>>>
>>>  
>>>
>>> * Moved the getHeader() and getMetadata() commands to an internal
>> interface
>>>   called CC2420PacketBody, provided by CC2420PacketC
>>>
>>>  
>>>
>>> * Separated core functionality into different sub-packages/directories
>>>
>>>   > Updated micaz, telosb, intelmote2 .platform files
>>>
>>>   > Logically organizes code
>>>
>>>  
>>>
>>> * Updated some LPL architecture
>>>
>>>   > Removed continuous modulation because it didn't work 100% and I 
>>> don't have
>>>
>>>     time to make it work.
>>>   > Decreased backoffs and decreased on-time for detects, saving energy.
>>>
>>>  
>>>
>>> * Updated to the new AMPacket interface; made the radio set the outbound
>>>
>>>   packet's destpan after send().
>>>
>>>  
>>>
>>>  
>>>
>>>  
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
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>>> Tinyos-devel at Millennium.Berkeley.EDU
>>> https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-devel 
>>>
>>
>>
>>