今天在ti官网找了找，也没找到专门针对cca的应用手册。
手册中只有这段描述：
23.8.12 Clear-Channel Assessment
The clear-channel assessment (CCA) status signal indicates whether the channel is available for
transmission or not. The CCA function is used to implement the command-strobe-processor functionality
specified in the IEEE 802.15.4 specification [1]. The CCA signal is valid when the receiver has been
enabled for at least eight symbol periods. The RSSI_VALID status signal can be used to verify this.
The CCA is based on the RSSI value and a programmable threshold. The exact behavior is configurable
in the CCACTRL0 and CCACTRL1 registers.
There are two variations of the CCA signal, one that is updated at every new RSSI sample and one that is
only updated on SSAMPLECCA/ISAMPLECCA and STXONCCA/ISTXONCCA command strobes. They
are both available in the FSMSTAT1 register.
Note that the CCA signal is updated four clock cycles (system clock) after the RSSI_VALID signal has
been set.
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