Ardiuno Serial RW from Tera Term

Projects Programming
1

Hi All,

I'm trying to make a program that it reads from serial and replies.

If I use Ardiuno IDE > Tools > Serial Monitor it reads line and replies to the commands.
But if I use Tera Term it only reads one character at a time.

Here's my code:

#define CMDBUFFER_SIZE 32
String readString;

void setup() 
{
  Serial.println("Ardiuno Started");
  Serial.begin(115200);
  Serial.setTimeout(3);
}

void loop() 
{
    while(Serial.available())
        {
    delay(3);
    readString = Serial.readStringUntil('\n');
  if(readString.length()>0)
  {
    Serial.print("First String is ");
    Serial.println(readString);
    if(readString == "AT" || readString == "at")
    {
      Serial.println("OK");
    }
    else if (readString == "AT+RESET" || readString == "at+reset")
    {
      Serial.println("Resetting the device");
    }
    else if(readString == "AT+RANDOM" || readString == "at+random")
    {
      for (int i = 0; i < 300; ++i)
      {
        int randInt = random(300);
        Serial.println(randInt);
        delay(50); 
      }
    }
    else
    {
      Serial.println("No Command Found");
    }
    readString = "";
    Serial.println(readString);
  }
}
}

How can I configure my code or environment to achieve communicate from Tera Term?

2

The problem lies in the fact Serial Monitor is a pretty janky 'pretend' serial terminal.
PuTTY or TeraTerm are far better options, because they let you configure the serial stream and terminal parameters individually - as well as sending each character as it's typed.

Typically, you would receive each character individually, then accumulate those into a straing - when CR or LF is received you can parse that complete string to identify your command as needed.

The benefit or processing character by character - is that you can respond to individual 'special characters' to perform 'special' actions... like BACKSPACE, ESCAPE, TAB and RETURN - among others.

3

You have two choices:

  1. Configure terminal for character echo and program simply accepts characters.
  2. Configure terminal for no echo, and have the program echo everything it receives.

An over simplification because in a mature implementation, some control characters aren't echoed.

I prefer application controlled echo because it doesn't send "blindly". The characters you see must have been received and processed.

4

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