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8.4 Energy Detection (ED)
The Atmel AT86RF232 Energy Detection (ED) module is characterized by:
? 84 unique energy levels defined
? 1dB resolution
8.4.1 Overview
The receiver ED measurement is used by the network layer as part of a channel
selection algorithm. It is an estimation of the received signal power within the bandwidth
of an IEEE 802.15.4 channel. No attempt is made to identify or decode signals on the
channel. The ED value is calculated by averaging RSSI values over eight symbols
(128μs).
8.4.2 Measurement Description
There are two ways to initiate an ED measurement:
? Manually, by writing an arbitrary value to register 0x07 (PHY_ED_LEVEL), or
? Automatically, after detection of a valid SHR of an incoming frame.
For manually initiated ED measurements the radio transceiver needs to be in one of the
states RX_ON or BUSY_RX state. The end of the ED measurement is indicated by an
interrupt IRQ_4 (CCA_ED_DONE).
An automated ED measurement is started if an SHR is detected. The end of the
automated measurement is not signaled by an interrupt.
Note:
1.
The ED result is not updated during the rest of the frame reception, even by
requesting an ED measurement manually.
The measurement result is stored after t ED = 180μs (max.) (128μs measurement
duration and processing delay) in register 0x07 (PHY_ED_LEVEL) ), refer to Table 7-2 .
Thus by using Basic Operating Mode, a valid ED value from the currently received
frame is accessible 108μs after IRQ_2 (RX_START) and remains valid until a new
RX_START interrupt is generated by the next incoming frame or until another ED
measurement is initiated.
When
using the Extended Operating Mode, it
is recommended to mask
IRQ_2 (RX_START), thus the interrupt cannot be used as timing reference. A
successful frame reception is signalized by interrupt IRQ_3 (TRX_END). The minimum
time span between an IRQ_3 (TRX_END) interrupt and a following SFD detection is
t SHR_SYNC = 96μs due to the length of the SHR. Including the ED measurement time, the
ED value needs to be read within 224μs after the TRX_END interrupt; otherwise, it
could be overwritten by the result of the next measurement cycle. This is important for
time critical applications or if interrupt IRQ_2 (RX_START) is not used to indicate the
reception of a frame.
90
AT86RF232
Note:
2.
It is not recommended to manually initiate an ED measurement when using the
Extended Operating Mode.
8321A – MCU Wireless – 10/11
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