51单片机实现对无线模块的数据传输。上位机程序(The primary states of the Si446x are shown in Figure 6. The shutdown state completely shuts down the radio to
minimize current consumption. Standby/Sleep, SPI Active, Ready, TX Tune, andRX tune are available to optimize
the current consumption and response time to RX/TX for a given application. API commands START_RX,
START_TX, and CHANGE_STATE control the operating state with the exception of shutdown which is controlled
by SDN, pin 1. Table 9 shows each of the operating modes with the time required to reach either RX or TX mode as)