LoRa

1 Key Concepts

Static configuration registers can only be accessed in Sleep, Standby or FSTX mode
The LoRa FIFO can only be filled in Standby mode
Data TX is initiated by sending TX mode request
Upon completion the TxDone interrupt is issued and the radio returns to Standby mode
Following transmission the radio can be manually placed in Sleep mode or the FIFO refilled for subsequent TX operation

LoRa TX data FIFO filling:

Reg_Fifo 是 FIFO 的统一读写口，SPI 读写 Reg_Fifo，就会去 FIFO 内部地址为 Reg_FifoAddrPtr 的位置取放数据

TX_Modem 直接去 FIFO 地址为 Reg_FifoTxBaseAddr 的位置，取 PayloadLength 字节的数据