LoRa LR1120 module embedded in a custom prototype.

[Mcz1025]

GNSS communication with esp32-s3-mini and LoRa LR1120 module embedded in a custom prototype.
Hello everyone I hope you are very well, I am writing because I need help in GNSS satellite communication as I am implementing the radiolib library but for some reason the function (int state = radio.gnssScan(&gnssResult;) is not running I understand that it is a custom design and can also hardware errors but I have reviewed and measured voltages in the modules and all is well working at 3. 3 v I have the satellite trace is fine I want you to help me with the communication please the only different thing is that for some reason the IRQ pin does not connect it to the LR1120 module with the esp32 for that reason I do not use the IRQ I am totally grateful for any help you can give me thank you very much and greetings.

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

// Definición de pines según tus conexiones
#define NSS 34
#define RESET 39
#define BUSY 26
#define SCK 36
#define MOSI 35
#define MISO 37
#define DIO1 2
#define LNA 33

// Inicializa el módulo LR1120 con los pines configurados
LR1120 radio = new Module(NSS,RADIOLIB_NC,RESET, BUSY);

// Tabla de configuración del switch RF (puedes ajustarla según tu hardware)
static const uint32_t rfswitch_dio_pins[] = {
RADIOLIB_LR11X0_DIO5, RADIOLIB_LR11X0_DIO6,
RADIOLIB_NC, RADIOLIB_NC, RADIOLIB_NC
};

static const Module::RfSwitchMode_t rfswitch_table[] = {
{ LR11x0::MODE_STBY, { LOW, LOW } },
{ LR11x0::MODE_RX, { HIGH, LOW } },
{ LR11x0::MODE_TX, { HIGH, HIGH } },
{ LR11x0::MODE_TX_HP, { LOW, HIGH } },
{ LR11x0::MODE_TX_HF, { LOW, LOW } },
{ LR11x0::MODE_GNSS, { LOW, LOW } },
{ LR11x0::MODE_WIFI, { LOW, LOW } },
END_OF_MODE_TABLE,
};

// Estructuras para guardar los resultados de la GNSS
LR11x0GnssResult_t gnssResult;
LR11x0GnssPosition_t gnssPosition;

// Variables de temporización
unsigned long previousMillis = 0; // Almacena el tiempo previo
const unsigned long interval = 10000; // Intervalo de tiempo (10 segundos)

void setup() {
Serial.begin(115200);

// Configuración de pines
pinMode(RESET, OUTPUT);
pinMode(BUSY, INPUT);
pinMode(NSS, OUTPUT);
digitalWrite(NSS, LOW); // Asegúrate de liberar el pin NSS antes de comenzar

pinMode(LNA, OUTPUT);
digitalWrite(LNA, HIGH);

// Configuración del bus SPI
SPI.begin(SCK, MISO, MOSI, NSS);
//SPI.setFrequency(1000000); // 1 MHz
// Reiniciar módulo GNSS
radio.reset();
delay(100);
// Inicialización del LR1120
Serial.println(F("[LR1120] Comprobando comunicación SPI..."));
int state = radio.begin(433.0, 125.0, 9, 7, RADIOLIB_LR11X0_LORA_SYNC_WORD_PRIVATE, 10, 8, 1.6);
if (state != RADIOLIB_ERR_NONE) {
Serial.print(F("Error en la comunicación SPI, código "));
Serial.println(state);
while (true) { delay(10); }
}

Serial.println(F("[LR1120] Iniciando GNSS..."));
state = radio.beginGNSS(RADIOLIB_LR11X0_GNSS_CONSTELLATION_GPS, 1.6);
if (state != RADIOLIB_ERR_NONE) {
Serial.print(F("Error al inicializar GNSS, código "));
Serial.println(state);
while (true) { delay(10); }
}

Serial.println(F("Inicialización completa."));
}

void loop() {
unsigned long currentMillis = millis(); // Obtén el tiempo actual
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis; // Actualiza el tiempo previo

// Ejecuta un escaneo GNSS
Serial.println(F("Ejecutando escaneo GNSS..."));
int state = radio.gnssScan(&gnssResult);

Serial.print(F("Estado del escaneo GNSS: "));
Serial.println(state);

if (state == RADIOLIB_ERR_NONE) {
  Serial.print(gnssResult.demodStat);
  Serial.print("\t\t| ");
  
  // Obtiene los datos GNSS
  state = radio.getGnssPosition(&gnssPosition);

  Serial.print(F("Estado de obtención de posición GNSS: "));
  Serial.println(state);

  if (state == RADIOLIB_ERR_NONE) {
    // Imprime los resultados
    Serial.print(F("Latitud: "));
    Serial.print(gnssPosition.latitude, 6);
    Serial.print("\t| Longitud: ");
    Serial.print(gnssPosition.longitude, 6);
    Serial.print("\t| Precisión: ");
    Serial.print(gnssPosition.accuracy);
    Serial.print(F("\t\t| Satélites usados: "));
    Serial.println(gnssPosition.numSatsUsed);
  } else {
    Serial.print(F("Error al leer resultados, código "));
    Serial.println(state);
  }
} else {
  Serial.print(F("Falló el escaneo, código "));
  Serial.println(state);
}

}
}

[jgromes]

You have provided us nearly zero information - no serial output, no hardware description, and the code you have is so wrong it's not worth fixing. Use the default GNSS examples and reads the device documentation. Unless you can give us more information there's nothing we can do.

• What on Earth does "not running" mean?
• You can't just remove IRQ and expect it to work, it will not
• Your RF switch configuration is most likely wrong - you seem to have copy-pasted something from the examples without understanding what it actually does.

You seem to have to have started a project that is way above your experience.

[Mcz1025]

[StevenCellist]

Please edit your post to make your code look just like Mr Gromes did to your first post - without the formatting, your post is pretty much unreadable. Also, this new code is definitely not the code you used to upgrade the firmware, as you used a completely different pin layout. Also, you didn't answer the questions of Mr Gromes. While the SPI lines themselves may be functional (assuming that upgrading the firmware did actually work even though this is not the sketch you used), the IRQ and RF switch are not part of those functions. Nor did you provide any output. A good question will result in good answers, a very incomplete question will result in a very incomplete answer as we just can't help you.

[HeadBoffin]

Also, does the bare minimum code work, ie, Blinky? Does standard LoRaWAN work? Have you used the LR11x0 on any other platform to have something to compare with - this module is too complex to knock out on a first pass so being pretty familiar with it before making your own design would be more appropriate. Did you prototype with the ESP32-S3 and the LR1120 dev boards? And lastly, have you got a working satellite system going so you can compare transmissions. Satellite comms is just a whole new level of excitement, Mr Gromes knows, he did FOSSA, I know, I've done Lacuna as has Mr Cellist!

[Mcz1025]

[HeadBoffin]

What a mess of answers, there are facilities for formatting which would help you to help us to help you, so trying to pick through, I understand:

The board doesn't do normal (terrestrial) LoRaWAN.

You didn't prototype with development boards because "you don't really trust the design provided by the manufacturer" - you may want to consider that if you were better than the manufacturer, you wouldn't be asking questions on here. And it would instantly solve the answer of if you need DIO1 because you could wire it up - bit harder on a PCB.

You don't know if you have a device that already talks to the satellite.

one of my questions is if for a satellite communication it is necessary to use the DIO1

If you look at the code you are using and it uses DIO1, then yes. What's the harm in wiring it up anyway? Most LW implementations need BUSY (DIO0 of old) and one other interrupt line but can get away with just one.

You'd need to provide a whole heap more information for any real help - which satellite system, what is the firmware, manufacturer's reference design etc etc. If you took a colleague out for a coffee to ask for help on this, put yourself in their place and imagine what supporting information they'd need. And that's for someone who knows you, knows if you do hardware or can do software too, whereas we are starting from nothing.

[Mcz1025]

[HeadBoffin]

I don't know, my screen reader can't do images ...

[Mcz1025]

[jgromes]

Again, I had to format your code for you, mainly to keep my own sanity.

What you have posted seems to be a mix of different versions and your own attempts to randomly change stuff. Nothing in what you have posted is correct - delete it all and start with the examples, as I have written before.

1. Edit the SPI and pins. Verify that the ESP32 can talk to the radio.
2. Examine the RF switch - where is it connected to and how do you power your LNA (if you have one).
3. If you get an error, try to understand what it means. There are many resources here that will help you, even an online decoder. Search first, ask questions after.

If you choose to ignore these steps, and continue posting code mashed together without much thought, combined with screenshots of serial output (seemingly purpose-built to irritate @HeadBoffin specifically), then I will lock this thread since it is not a particularly productive use of anybody's time :)

[Mcz1025]

I know it could be due to several variables such as problems with the clock, the satellite synchronisation, but I have checked them both and I can't find any errors, what recommendation can you give me?

[Mcz1025]

Finally thanks to GOD I got communication and update of 30 satellites, I am doing the example of autopositioning but I can see that the Longitude response gives me an erroneous value, could you help me understand why and how I could fix it please

[StevenCellist]

If I do my calculations right, I guess it's supposed to be roughly -76° longitude, is that right?

[Mcz1025]

yes, this is correct how did you arrive at the value of -76° what calculations did you use? yes, I live in Colombia.

[StevenCellist]

Semtech's LoRa Basics Modem and thus RadioLib does not account for negative latitude/longitude. It calculated the longitude using a uint16_t but it should be cast to int16_t first. Cc @jgromes.

[Mcz1025]

Great, could you help me to make the algorithm please I would be totally grateful.

[StevenCellist]

This should now be resolved in the latest two commits. Note that this is not in a release: you will have to manually download the source and replace the files in project / library with the newest ones.

[HeadBoffin]

@Mcz1025, you appear to have removed your original issue from the top of this thread along with your comments, leaving the efforts by the volunteers to assist you out of context. You should not expect too much enthusiasm from people to help if you show such disrespect.