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== CAD == Channel Activity Detection. It's designed to detect a LoRa preamble on the radio channel with the best possible power efficiency. Once in CAD mode, the SX127x will perform a very quick scan of the band to detect a LoRa packet preamble. During CAD, the following operation take place: * The PLL locks * The radio receiver captures LoRa preamble symbol of data from the channel. The radio current consumption during that phase is approximately 10mA. * The radio receiver and the PLL turn off and the modem digital processing starts. * The modem searches for a correlation between the Radio captured samples and the ideal preamble waveform. This correlation process takes a little bit less than a symbol period toperform. The radio current consumption during that phase is greatly reduced. * Once the calculation is finished the modem generates the CadDone interrupt. If the correlation was successful, the CadDetected is generated simultaneously. * The chip goes back to stand-by mode. * If a preamble was detected, clear the interrupt, then initiate the reception by putting the radio in RX single mode or RX continuous mode. The typical CAD detection time: SymbolTime = (2^SF + 32) / BW seconds Refer to: [https://www.semtech.com/uploads/documents/an1200.21_std.pdf Reading channel RSSI during a CAD] <br>
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