SX1262 LoRa module error -707 and -5 when transmitting

[FloTec508]

Hello!

I am using this module here on a ESP32: https://www.waveshare.com/wiki/Pico-LoRa-SX1262

I have connected all the pins accordingly to the ESP32. The configuration is the following:

LoRa Pin	ESP32 Pin
Sck	GPIO18
LoRa MISO	GPIO19
LoRa MOSI	GPIO 23
LoRa CS	GPIO5
LoRa DIO1	GPIO26
LoRa RESET	GPIO27
LoRa BUSY	GPIO14

The problem is the following: The initialization of the module works without any errors. No problems there. But as soon as I call the .transmit() function, I get the errors -707 and -5 repeatingly. I already checked the wiring and redid all of it. But still, the error persists. This is the code-snippet:

SX1262 lora = new Module(5, 26, 27, 14);

void setup(){
int state = lora.begin(868.0, 125.0, 9, 7, 0x12, 10, 8, 1.6, false);
  if (state == RADIOLIB_ERR_NONE) {
    Serial.println("LoRa module initialized successfully!");
  } else {
    Serial.print("Initialization failed, code: ");
    Serial.println(state);
    while (true);
  }
}

//inside my function:

int state = lora.transmit(data);
        
        if (state == RADIOLIB_ERR_NONE) {
        Serial.println(">LoRa:Okay|t");
        } else {
        Serial.print(">LoRa: ");
        Serial.print(state);
        Serial.println("|t");
        }

I have spent many hours trying to debug this, but I couldn't find any solution. I hope somebody can help me here.

[weekroom]

Try setting the TCXO reference voltage to 0
lora.begin(868.0, 125.0, 9, 7, 0x12, 10, 8, 0, false)

[FloTec508]

I have already tried this. Then the function throws error -707 and setup does not complete

[jgromes]

Issues after calling transmit are usually caused by insufficient power supply - check the Troubleshooting guide. You can also enable SPI debug to see where exactly does this problem manifest.

[GUVWAF]

I've had a similar issue when connecting this hat to a Raspberry Pi (not Pico), until I connected both the 3.3V and 5V pins. Do you have those already?

[FloTec508]

No, I will try it...

[GUVWAF]

It's a bit misleading that the page you linked doesn't specify the 3.3V as power supply (but rather as OUT), but this page does: https://www.waveshare.com/pico-lora-sx1262-868m.htm

[jgromes]

Thanks! I edited the header file and initialized the Serial port before initializing the lora module

You have to rebuild the sketch and then upload it again. If you enabled debug correctly, you will se debug information being printed during build.

[FloTec508]

Thank you so much! That fixed it! Wasted 3 days of my life and now fixed it in 30s.