How to Set Up Point-to-Point Communication Between Two LoRa-E5 Mini Modules?

Products & Technology LoRa
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Since it seems that the standby() function cannot return, I added Serial.print() inside the standby() function. Please check which line it executes and stops at.

Oren_SX126x_PingPong.ino.zip (45.8 KB)

int16_t SX126x::standby() {
  Serial.print("    standby() standbyXOSC="); Serial.println(standbyXOSC);	
  return(SX126x::standby(this->standbyXOSC ? RADIOLIB_SX126X_STANDBY_XOSC : RADIOLIB_SX126X_STANDBY_RC));
}

int16_t SX126x::standby(uint8_t mode, bool wakeup) {
  Serial.print("    standby() mode="); Serial.print(mode); Serial.print("  wakeup="); Serial.println(wakeup);	
  Serial.println("    // set RF switch (if present)");
  this->mod->setRfSwitchState(Module::MODE_IDLE);

  if(wakeup) {
    Serial.println("    // pull NSS low to wake up");
    this->mod->hal->digitalWrite(this->mod->getCs(), this->mod->hal->GpioLevelLow);
  }
  uint8_t data[] = { mode };
  Serial.println("    SPIwriteStream RADIOLIB_SX126X_CMD_SET_STANDBY");
  return(this->mod->SPIwriteStream(RADIOLIB_SX126X_CMD_SET_STANDBY, data, 1));
}

08:49:22.792 → Master UID 535EE2F
08:49:22.792 → ******** verify=1
08:49:22.792 → // run the reset sequence
08:49:22.792 → // return immediately when verification is disabled
08:49:22.792 → // set mode to standby - SX126x often refuses first few commands after reset
08:49:22.792 → // try to set mode to standby
08:49:22.792 → standby() standbyXOSC=0
08:49:22.792 → standby() mode=0 wakeup=1
08:49:22.792 → // set RF switch (if present)
08:49:22.792 → // pull NSS low to wake up
08:49:22.792 → SPIwriteStream RADIOLIB_SX126X_CMD_SET_STANDBY
08:49:22.824 → // standby command failed, check timeout and try again
08:49:22.824 → // wait a bit to not spam the module
08:49:22.824 → while
08:49:22.824 → // try to set mode to standby
08:49:22.824 → standby() standbyXOSC=0
08:49:22.824 → standby() mode=0 wakeup=1
08:49:22.824 → // set RF switch (if present)
08:49:22.824 → // pull NSS low to wake up
08:49:22.824 → SPIwriteStream RADIOLIB_SX126X_CMD_SET_STANDBY
08:49:22.857 → // standby command successful
08:49:22.857 → **** return state
08:49:22.857 →
08:49:22.857 → ******** verify=1
08:49:22.857 → // run the reset sequence
08:49:22.857 → // return immediately when verification is disabled
08:49:22.857 → // set mode to standby - SX126x often refuses first few commands after reset
08:49:22.857 → // try to set mode to standby
08:49:22.857 → standby() standbyXOSC=0
08:49:22.857 → standby() mode=0 wakeup=1
08:49:22.857 → // set RF switch (if present)
08:49:22.857 → // pull NSS low to wake up
08:49:22.889 → SPIwriteStream RADIOLIB_SX126X_CMD_SET_STANDBY
08:49:22.889 → // standby command failed, check timeout and try again
08:49:22.889 → // wait a bit to not spam the module
08:49:22.889 → while
08:49:22.889 → // try to set mode to standby
08:49:22.889 → standby() standbyXOSC=0
08:49:22.889 → standby() mode=0 wakeup=1
08:49:22.889 → // set RF switch (if present)
08:49:22.889 → // pull NSS low to wake up
08:49:22.921 → SPIwriteStream RADIOLIB_SX126X_CMD_SET_STANDBY
08:49:22.921 → // standby command successful
08:49:22.921 → **** return state
08:49:22.921 →
08:49:22.921 → standby() standbyXOSC=0
08:49:22.921 → standby() mode=0 wakeup=1
08:49:22.921 → // set RF switch (if present)
08:49:22.921 → // pull NSS low to wake up
08:49:22.921 → SPIwriteStream RADIOLIB_SX126X_CMD_SET_STANDBY
08:49:22.921 → standby() standbyXOSC=0
08:49:22.921 → standby() mode=0 wakeup=1
08:49:22.921 → // set RF switch (if present)
08:49:22.954 → // pull NSS low to wake up
08:49:22.954 → SPIwriteStream RADIOLIB_SX126X_CMD_SET_STANDBY
08:49:22.987 → radio.begin() success!
08:49:22.987 → END of setup()

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