To control external PA and LNA, first follow the GPIO lookup table (see section 7.1.1.1
GPIO lookup table) to configure the specific two pins as TX_CYC2PA and RX_CYC2LNA
function, respectively. Note: To use TX_CYC2PA and RX_CYC2LNA function for the two pins, other
functions with higher polarity should be disabled at the same time. After the two pins are
configured as TX_CYC2PA and RX_CYC2LNA function, the output function is enabled. Generally the
two pins are high active: When both the two pins output low level, the external PA and LNA are
disabled; when one of the two pins output high level, the external PA/LNA are enabled
correspondingly; the two pins won’t output high level simultaneously