Problem starting the sim7600 module and the gps

[manuelcm15]

Greetings, I recently bought a lilygo T-SIM7600G-H 16MB card and I have been experimenting with it, but on many occasions a problem happens to me when I initialize the sim7600 and if I go through that stage, the start of the GPS gives me an initial problem

I am using the tinyGSM library and copying the code of interest from the AllFunctions.ino example

void setupModem(){
// Set GSM module baud rate
  sim7000G.begin(UART_BAUD, SERIAL_8N1, PIN_RX, PIN_TX);
  setupPin();
  delay(300);
  modemPowerOn();
  delay(500);
  connectToNet();
}

void setupPin(){
  pinMode(PWR_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
}

void modemPowerOn(){
  digitalWrite(PWR_PIN, HIGH);
  delay(300); //Need delay
  digitalWrite(PWR_PIN, LOW);

  delay(300);

  if (!modem.init()) {
    Serial.println("Failed to init modem, delaying 10s and retrying");
    delay(10000);
    if(!modem.restart()){
       Serial.println("Failed to restart modem, delaying 10s and retrying");
       resetDevice();
      return;
    }
  }
}

void setupGPS(){
  if(!modem.enableGPS()){
    log("[ERROR] GPS no iniciado");
    w++;
  }
  else{
     log("[INFO] GPS Encendido");
     isGPSInit = true;
  }
  light_sleep(2);
}

When I get false in modem.init() I proceed to print in the terminal and then execute modem.restart() but both methods give me false.

If luckily the modem starts correctly when it's time to start the GPS I get false and I don't know exactly the problem.

This problem happens very frequently when I use the USB cable and when I use a 3.7V 18650 battery.

[lewisxhe]

please start here

https://github.com/Xinyuan-LilyGO/T-SIM7600X/blob/master/examples/AllFunctions/AllFunctions.ino

[manuelcm15]

UPDATE: I have reviewed the example that you mention but I still have the same problem but I have noticed the following:

When connecting the card for the first time everything works fine but if I touch the reset button and start again the sim7600 does not respond it is as if it were stuck with some bad configuration of the restart, if I disconnected the power source and connected it again the sim7600 responds

The problem is when I restart and it generates this strange error, it happens the same when I restart the esp32 with the following code:

       void resetDevice(){
        Serial.flush(); 
        ESP.restart(); 
      }

If there is a problem and I need to reboot the device, how should I reboot the sim7600 modem?

[antonio-emilio]

I'm having the same problem. Did you solved?

[dimadolgopolovn]

For me it was a slightly different problem where the buffer wasn't emptied after crashing. Running AT+CRESET helped in my case.