ESP32CAM: I can't use Serial port

Hello everyone, I’m still using platformIO to develop ESP32 but, I have a lot of problems with ESP32CAM.

In this case, I have a problem with serial port communcation, but no a problem like something knew, is like… I don’t see anything.

I know that my code works, because I uploaded it by arduino IDE and it gave me all the output that should give, but, when I wanna see it by platformio IDE I don’t see anything, I see the port empty.

This es the code

#include <Arduino.h>

// Definición de los pines para la SD
#include "FS.h"
#include "SD_MMC.h"
#include "SPI.h"

/*
    Esta función acepta como argumentos el sistema de archivos, el nombre del directorio principal
    y los niveles para entrar en el directorio
*/

const int chipSelect = 16; // Pin CS de la tarjeta SD

//--------------------------------------------------------------- Funciones de manejo de SD
// Función para la enumeración de los deirectorios de la SD
void listDir(fs::FS &fs, const char * dirname, uint8_t levels){

  // Listado de directorios
  Serial.printf("Listing directory: %s\n", dirname);
 
  // Intentamos abrir un drectorio
  File root = fs.open(dirname);
  if(!root){
    Serial.println("Failed to open directory");
    return;
  }
  if(!root.isDirectory()){
    Serial.println("Not a directory");
    return;
  }

  // Listamos los contenidos de los directorios
  File file = root.openNextFile();
  while(file){
    if(file.isDirectory()){
      Serial.print("  DIR : ");
      Serial.println(file.name());
      if(levels){
        listDir(fs, file.name(), levels -1);
      }
    } else {
      Serial.print("  FILE: ");
      Serial.print(file.name());
      Serial.print("  SIZE: ");
      Serial.println(file.size());
    }
    file = root.openNextFile();
  }

  // Un ejemplo de uso de esta función ::: 	listDir(SD, "/", 0);
}

// Función para crear un directorio
void createDir(fs::FS &fs, const char * path){

  // Creamos un direcotorio 
  Serial.printf("Creating Dir: %s\n", path);
  if(fs.mkdir(path)){
    Serial.println("Dir created");
  } else {
    Serial.println("mkdir failed");
  }

  // Un ejemplo del uso de esta función es ::: createDir(SD, "/mydir");
}

// Función para eliminar un directorio
void removeDir(fs::FS &fs, const char * path){

  // Eliminamos el directorio definido
  Serial.printf("Removing Dir: %s\n", path);
  if(fs.rmdir(path)){
    Serial.println("Dir removed");
  } else {
    Serial.println("rmdir failed");
  }

  // Un ejemplo del uso de esta función es ::: removeDir(SD, "/mydir");
}

// Función para leer el contenido del archivo
void readFile(fs::FS &fs, const char * path){

  // Leemos un determinado archivo de una deteminada ruta
  Serial.printf("Reading file: %s\n", path);
 
  File file = fs.open(path);
  if(!file){
    Serial.println("Failed to open file for reading");
    return;
  }
 
  Serial.print("Read from file: ");
  while(file.available()){
    Serial.write(file.read());
  }
  file.close();

  // Un ejemplo de uso de esta función es ::: readFile(SD, "/hello.txt")
}

// Función para escribir cosas en un archivo
void writeFile(fs::FS &fs, const char * path, const char * message){

  // Metemos conten
  Serial.printf("Writing file: %s\n", path);
 
  File file = fs.open(path, FILE_WRITE);
  if(!file){
    Serial.println("Failed to open file for writing");
    return;
  }
  if(file.print(message)){
    Serial.println("File written");
  } else {
    Serial.println("Write failed");
  }
  file.close();

  // Un ejemplo de uso de esta función es ::: writeFile(SD, "/hello.txt", "Hello ");
}

// Función para añadir contenido a un archivo
void appendFile(fs::FS &fs, const char * path, const char * message){
  Serial.printf("Appending to file: %s\n", path);
 
  File file = fs.open(path, FILE_APPEND);
  if(!file){
    Serial.println("Failed to open file for appending");
    return;
  }
  if(file.print(message)){
    Serial.println("Message appended");
  } else {
    Serial.println("Append failed");
  }
  file.close();
}

// Función para cambiar nombre a un archivo
void renameFile(fs::FS &fs, const char * path1, const char * path2){
  Serial.printf("Renaming file %s to %s\n", path1, path2);
  if (fs.rename(path1, path2)) {
    Serial.println("File renamed");
  } else {
    Serial.println("Rename failed");
  }
}

// Función para eliminar un archivo
void deleteFile(fs::FS &fs, const char * path){
  Serial.printf("Deleting file: %s\n", path);
  if(fs.remove(path)){
    Serial.println("File deleted");
  } else {
    Serial.println("Delete failed");
  }
}

// Función para probar un archivo, cuanto tiempo le llega
void testFileIO(fs::FS &fs, const char * path){
  File file = fs.open(path);
  static uint8_t buf[512];
  size_t len = 0;
  uint32_t start = millis();
  uint32_t end = start;
  if(file){
    len = file.size();
    size_t flen = len;
    start = millis();
    while(len){
      size_t toRead = len;
      if(toRead > 512){
        toRead = 512;
      }
      file.read(buf, toRead);
      len -= toRead;
    }
    end = millis() - start;
    Serial.printf("%u bytes read for %u ms\n", flen, end);
    file.close();
  } 
  else {
    Serial.println("Failed to open file for reading");
  }
 
  file = fs.open(path, FILE_WRITE);
  if(!file){
    Serial.println("Failed to open file for writing");
    return;
  }
 
  size_t i;
  start = millis();
  for(i=0; i<2048; i++){
    file.write(buf, 512);
  }
  end = millis() - start;
  Serial.printf("%u bytes written for %u ms\n", 2048 * 512, end);
  file.close();
}

void setup(){
  Serial.begin(115200);
  delay(2000);

  if(!SD_MMC.begin()){
    Serial.println("Card Mount Failed");
    return;
  }

  uint8_t cardType = SD_MMC.cardType();
  if(cardType == CARD_NONE){
    Serial.println("No SD card attached");
    return;
  }

  Serial.println("TIPO DE TARJETA...");
  if(cardType == CARD_MMC){
    Serial.println("MMC");
  } else if(cardType == CARD_SD){
    Serial.println("SDSC");
  } else if(cardType == CARD_SDHC){
    Serial.println("SDHC");
  } else {
    Serial.println("UNKNOWN");
  }

  uint64_t cardSize = SD_MMC.cardSize() / (1024 * 1024);
  Serial.printf("SD Card Size: %lluMB\n", cardSize);

  listDir(SD_MMC, "/", 0);
  createDir(SD_MMC, "/mydir");
  listDir(SD_MMC, "/", 0);
  removeDir(SD_MMC, "/mydir");
  listDir(SD_MMC, "/", 2);
  writeFile(SD_MMC, "/hello.txt", "Hello ");
  appendFile(SD_MMC, "/hello.txt", "World!\n");
  readFile(SD_MMC, "/hello.txt");
  deleteFile(SD_MMC, "/foo.txt");
  renameFile(SD_MMC, "/hello.txt", "/foo.txt");
  readFile(SD_MMC, "/foo.txt");
  testFileIO(SD_MMC, "/test.txt");
}

void loop(){
  // No hay nada que hacer en el bucle principal
}

and I the expectation is the output of functions so… Thats so easy, the problem is that by platformIO i don’t see nothing, and by arduino IDE I see all.

This is the expected output (arduino’s IDE output)

And this is the… “nothing” of platformIO

My platformio.ini is this

[env:esp32cam]
platform = espressif32
board = esp32cam
framework = arduino
monitor_speed = 115200
monitor_echo = yes
monitor_filters = send_on_enter

What can I do? I prefer working with platformIO instead of arduino IDE

Did you try adding

monitor_rts = 0
monitor_dtr = 0

to your platformio.ini like Noob stuck on ESP32-CAM+MB with PIO/vscode - #5 by maxgerhardt says?