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8.5.3 Data Interpretation
The Atmel AT86RF232 current channel status (CCA_STATUS) and the CCA
completion status (CCA_DONE) are accessible in register 0x01 (TRX_STATUS). Note,
register bits CCA_DONE and CCA_STATUS are cleared in response to a
CCA_REQUEST.
The completion of a measurement cycle is indicated by CCA_DONE = 1. If the radio
transceiver detected no signal (idle channel) during the measurement cycle, the
CCA_STATUS bit is set to one.
When using the “energy above threshold” algorithm, any received power above
CCA_ED_THRES level is interpreted as a busy channel . The “carrier sense” algorithm
reports a busy channel when detecting an IEEE 802.15.4 signal above the RSSI BASE_VAL
(see Section 12.7 ). The radio transceiver is also able to detect signals below this value,
but the detection probability decreases with the signal power. It is almost zero at the
radio transceiver ’ s sensitivity level (see parameter P SENS ).
8.5.4 Interrupt Handling
Interrupt IRQ_4 (CCA_ED_DONE) is issued at the end of a manually initiated CCA
measurement.
Notes:
1.
2.
A CCA request should only be initiated in Basic Operating Mode receive states.
Otherwise the radio transceiver generates an IRQ_4 (CCA_ED_DONE) and
sets the register bit CCA_DONE = 1, even though no CCA measurement was
performed.
Requesting a CCA measurement in BUSY_RX state and during an ED
measurement, an IRQ_4 (CCA_ED_DONE) could be issued immediately after
the request. If in this case register bit CCA_DONE = 0, an additional interrupt
CCA_ED_DONE is issued after finishing the CCA measurement and register bit
CCA_DONE is set to one.
8.5.5 Measurement Time
The response time for a manually initiated CCA measurement depends on the receiver
state.
In RX_ON state the CCA measurement is done over eight symbol periods and the
result is accessible t CCA = 180μs after the request (see above).
94
AT86RF232
8321A – MCU Wireless – 10/11
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