Need help about LoRa IQ INVERSION

nueng.mao · May 7, 2020, 9:53am

I need to made cube cell broad to receive Request command in LoRa normal mode (inversion IQ is flase) and send data back in LoRa inversion IQ mode (inversion IQ= true) by change parameter in Radio.SetRxConfig and Radio.SetTxConfig like this

Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
LORA_SPREADING_FACTOR, LORA_CODINGRATE,
LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
true, 0, 0, true, 3000 );

Radio.SetRxConfig( MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD_ON,
0, true, 0, 0, false, true );

But it receive and transmit data in LoRa normal mode. I don’t know do something wrong or have other way to set LoRa Rx and Tx work in different inversion mode.

Supporter · May 12, 2020, 7:21am

Here is a LoRa normal mode receiver example:

github.com

HelTecAutomation/ASR650x-Arduino/blob/master/libraries/LoRa/examples/LoRaBasic/LoRaReceiver/LoRaReceiver.ino

/* Heltec Automation Receive communication test example
 *
 * Function:
 * 1. Receive the same frequency band lora signal program
 * 
 * 
 * this project also realess in GitHub:
 * https://github.com/HelTecAutomation/ASR650x-Arduino
 * */

#include "LoRaWan_APP.h"
#include "Arduino.h"

/*
 * set LoraWan_RGB to 1,the RGB active in loraWan
 * RGB red means sending;
 * RGB green means received done;
 */
#ifndef LoraWan_RGB
#define LoraWan_RGB 0

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And here is the key to success node-to-node communication:
https://heltec-automation-docs.readthedocs.io/en/latest/esp32/frequently_asked_questions.html#node-to-node-communication