Kai Liu / Mbed 2 deprecated Nucleo_LoRaPHY

LoRaPHY project, based upon SX1276Lib, hardware with NUCLEO-F103EB/L053R8 and other boards as well as multiple Radio modules of SX1272/1276/1278. The code contains MACRO definitions and can be configured as TX/RX only, PINGPONG and consider to be a code base of RTTY.

Dependencies:   SX1276Lib mbed

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Bugs

Table of Contents

  1. Bugs
  2. PA channels
  3. TX timer overflow
  4. RX error

Bugs

  • PA channels
  • TX timer overflow
  • RX error

PA channels

After carefully compare the schematics between official dev boards from Semtech and RF module manufacturers, we found out:

  • Semtech SX1276 use 14dBm RFO_LF/HF as RF output
  • SX1278 RF modules usually use 20dBm PA_BOOST pin as RF output

Therefore, if we reuse SX1276Lib, the receiver will get very weak signal around -120dBm, since it has no matching antenna at all.

TX timer overflow

If system timer to used to trigger TX mode, the system time must be reset, and keep it running after that reset. Otherwise the system timer will overflow about 30 minutes.

RX error

The STM32L053R8/mbed5 port shows up RX_TIMEOUT_OR_ERROR on terminal, while STM32F103RB/mbed2 doesn't show up such error at very beginning. And we found it is caused by CRC ERROR，something wrong with register setup. Homepage

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