Radiolib with RP2040-Lora Waveshare module

Using Arduino Networking, Protocols, and Devices
1

Hello,

I'm trying to use the Waveshare RP2040-Lora module with the RadioLib library GitHub - jgromes/RadioLib: Universal wireless communication library for embedded devices. This module uses the Lora SX1262 chip on the RP2040 SPI1. During Radiolib initialization I have a return code « 707 » indicating a problem with the TCXO reference. If I'm not mistaken, is not used by default ; I tried to force the TCX0 to 0v without success via the call to the “setTCXO(0)” function. Do you have any idea of ​​the problem? Have you already used the waveshare RP2040-Lora successfully?

Tristan.

#include <SPI.h>
#include <RadioLib.h>

// SPI definition
#define LORA_SCK     14  // GP10
#define LORA_MISO    24   // GP8
#define LORA_MOSI    15  // GP11
#define LORA_SS      13  // GP9
#define LORA_RST     23  // GP23
#define LORA_DIO1    16  // GP16
#define LORA_BUSY    18  // GP18
#define LORA_ANT_SW  17  // GP17


SX1262 radio = new Module(LORA_SS, LORA_DIO1, LORA_RST, LORA_BUSY, SPI1);


//----------------------------------
void setup() {
  Serial.begin(9600);
  while (!Serial);

  // SPI configuration
  SPI1.setRX(LORA_MISO);
  SPI1.setTX(LORA_MOSI);
  SPI1.setSCK(LORA_SCK);
  SPI1.begin();
  
 
  // SX1262 init ------
  int state = radio.begin(868.0, 125.0, 12, 5, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, 17, 14);
  if (state != RADIOLIB_ERR_NONE) {
    Serial.print("LoRa init failed, Error code : ");
    Serial.println(state);
    while (true);
  }

  radio.setTCXO(1.8);

  Serial.println("LoRa Ok.");
}

void loop() {
  Serial.println("Send message...");
  int state = radio.transmit("Hello, LoRa!");
  
  if (state == RADIOLIB_ERR_NONE) {
    Serial.println("Transmission ok.");
  } else {
    Serial.print("Transmission error: ");
    Serial.println(state);
  }

  delay(5000);
}
1 Like
2

Hi,
This module doesn't have a TCXO and they don't even mention it on the wiki so i'm not sure how you're supposed to know that. In any case, you need to remove the radio.setTCXO(1.8);
line and modify this line int state = radio.begin(868.0, 125.0, 12, 5, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, 17, 14); to int state = radio.begin(868.0, 125.0, 12, 5, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, 17, 14, 0); By the way i was having problems with SPI on my module and your code helped me fix it so thank you for posting it.