Probably I'm doing something wrong. I'm writing an Arduino sketch for ESP32.

Among the others I have this function:

#define HDR_MAX_LENGHT 4
#define CMD_MAX_LENGHT 5
#define ARG_MAX_LENGHT 5
#define ARG_MAX_NUMBER 8

void ProcessLine(HardwareSerial *serial, char *line)
{
  int ret;
  int argc;
  char header[HDR_MAX_LENGHT + 1];
  char cmd[CMD_MAX_LENGHT + 1];
  char argv[ARG_MAX_NUMBER][ARG_MAX_LENGHT + 1];

  return; // for debugging
}

This is used in this way:

void loop() 
{
    static char inBuf[64];

    if (Serial.available())
    {
      size_t size = Serial.readBytes(inBuf, 64);
      inBuf[size] = '\0';
      ProcessLine(&Serial, inBuf);
    }  
}

In the last days all worked fine. After adding other code, I noticed that sometimes my program "hangs": nothing runs. Perhaps it goes in an exception trap.

Commenting out the different sections of the code, I discovered that if I remove the declarations of the variables in ProcessLine() no more hangs happen. The current RAM consumption is negligible: 0.5%.

During the tests NO serial data was received! So the function ProcessLine() was never called. Hence, only the declaration of the variables lead to the "hang".

I wonder if there are some mistakes in the code above. Otherwise, how I can further debug my code to understand what I've done wrong?

Probably I'm doing something wrong. I'm writing an Arduino sketch for ESP32. Among the others I have this function:

#define HDR_MAX_LENGHT 4
#define CMD_MAX_LENGHT 5
#define ARG_MAX_LENGHT 5
#define ARG_MAX_NUMBER 8

void ProcessLine(HardwareSerial *serial, char *line)
{
  int ret;
  int argc;
  char header[HDR_MAX_LENGHT + 1];
  char cmd[CMD_MAX_LENGHT + 1];
  char argv[ARG_MAX_NUMBER][ARG_MAX_LENGHT + 1];

  return; // for debugging
}

Usage example:

void loop() 
{
    static char inBuf[64];

    if (Serial.available())
    {
      size_t size = Serial.readBytes(inBuf, 64);
      inBuf[size] = '\0';
      ProcessLine(&Serial, inBuf);
    }  
}

In the last days all worked fine. After adding other code, I noticed that sometimes my program "hangs": nothing runs. Perhaps it goes in an exception trap.

Commenting out the different sections of the code, I discovered that if I remove the declarations of the variables in ProcessLine() no more hangs happen. The current RAM consumption is negligible: 0.5%.

During the tests NO serial data was received! So the function ProcessLine() was never called. Hence, only the declaration of the variables lead to the "hang".

I wonder if there are some mistakes in the code above. Otherwise, how I can further debug my code to understand what I've done wrong?