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RFM95 Datasheet(HTML) 37 Page - HOPE Microelectronics CO., Ltd.

Part No. RFM95
Description  Low Power Long Range Transceiver Module
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Maker  HOPE [HOPE Microelectronics CO., Ltd.]
Homepage  https://www.hoperf.com/
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RFM95 Datasheet(HTML) 37 Page - HOPE Microelectronics CO., Ltd.

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Page 37
RFM95/96/97/98(W)
Tel: + 86-755-82973805
Fax: + 86-755-82973550
E-mail: sales@hoperf.com http:/ / www.hoperf.com
WIRELESS & SENSING
PRELIMINARY
DATASHEET
Each time the RxDone interrupt is received, latch the RegFifoRxByteAddr[7:0] register content in a variable , this
variable will be called start_address. The RegFifoRxByteAddr[7:0] register of the RFM95/96/97/98(W) gives in real
time the address of the last byte written in the data buffer + 1 (or the address at which the next byte will be written) by
the receive LoRa modem . So by doing this , we make sure that the variable start_address always contains the start
address of the next packet.
Upon reception of the interrupt ValidHeader, start polling the RegFifoRxByteAddr[7:0] register until it begins to
increment. The speed at which this register will increment depends on the Spreading factor, the error correction code
and the modulation bandwidth. (Note that this interrupt is still generated in implicit mode).
As soon as RegFifoRxByteAddr[7:0] >= start address + 4, the first 4 bytes (address) are stored in the FIFO data buffer.
These can be read and tested to see if the packet is destined for the radio and either remaining in Rx mode to receive
the packet or returning to sleep mode if not.
Receiver Timeout Operation
In either single or continuous LoRa
TM
  reception modes, a receiver timeout functionality is available that permits the receiver
to listen for a pre-determined period of time before generating an interrupt signal to indicate that no valid packets have
been received. The timer is absolute and commences as soon as the radio is placed in either single or continuous receive
mode. The interrupt itself, RxTimeout, can be found in the interrupt register RegIrqFlags. In Rx Single mode, the device will
return in Stanby mode as soon as the interrupt occurs and the interrupt needs to be cleared before to return in Rx Single
mode. In Rx Continuous mode, the interrupt will interrupt will simply be raised but the device will stay in Rx Continous
mode. It is therefore the responsability on the controller to clear the interrupt while still in Rx Continuous mode. The
programmed timeout value is expressed as a multiple of the symbol period and is given by:
TimeOut = LoraRxTimeout · Ts


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