I can't save data on SD

[ivan321pum]

The problem comes when mixing scripts, it might be because in one script i am using 9600 bits per second and other value in the other script

#include <Arduino.h>

#include <SPI.h>
#include <SD.h>

#include "calidad_aire.h"
#include "hora.h"

//SD
const int chipSelect = 4;  // Pin CS del módulo lector de tarjetas microSD

File dataAire;
File dataMetano;

//Calidad Aire
int calidad_aire;

//Reloj
String hora;
String fecha;

void datos_setup() {
  delay(300);
  Serial.begin(9600);
  
  // Inicializar la comunicación con la tarjeta microSD
  if (!SD.begin(chipSelect)) {
    Serial.println("¡Error al inicializar la tarjeta microSD!");
    return;
  }

  Serial.println("Tarjeta microSD inicializada correctamente.");
}

void datos_loop(){
  calidad_aire = CalidadAire();

  dataAire = SD.open("calidad_aire.txt", FILE_WRITE);

  hora = getCurrentTime();
  fecha = getCurrentDate();

  if(!dataAire){
    Serial.println("Error en apertura de archivo");
    dataAire.close();
  }else{
        dataAire.print(hora + ", ");
    dataAire.print(fecha + ", ");
    dataAire.println(calidad_aire);
    dataAire.close();
    Serial.println("Dato guardado");
  }
}

[b707]

What is the issue with the code?

[HazardsMind]

Have you confirmed the wiring to the SDCard module is correct and if so, have you confirmed the module even works using the example sketch (if it has one)?

[xfpd]

Your sketch has neither of the required functions: setup() nor loop() Rename your datos_setup() and datos_loop() to setup() and loop()