What is the key enter's code in raw mode?

[zsdz]

The doc/keyboard.txt said the return (it return means key enter?) key's code under cook mode is ^J (is ^ means key control?)

I am trying write a simple editor with circle under rpi4 raw mode.most of work have been down.The code learned from https://viewsourcecode.org/snaptoken/kilo/ ,add I change the code use lib termiso with mConsole.SetOptions

kilo use this func got keyboard char enter:

int editorReadKey() {
  int nread;
  char c;
  while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
    if (nread == -1 && errno != EAGAIN) die("read");
  }

  if (c == '\x1b') {
    char seq[3];

    if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b';
    if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';

    if (seq[0] == '[') {
      if (seq[1] >= '0' && seq[1] <= '9') {
        if (read(STDIN_FILENO, &seq[2], 1) != 1) return '\x1b';
        if (seq[2] == '~') {
          switch (seq[1]) {
            case '1': return HOME_KEY;
            case '3': return DEL_KEY;
            case '4': return END_KEY;
            case '5': return PAGE_UP;
            case '6': return PAGE_DOWN;
            case '7': return HOME_KEY;
            case '8': return END_KEY;
          }
        }
      } else {
        switch (seq[1]) {
          case 'A': return ARROW_UP;
          case 'B': return ARROW_DOWN;
          case 'C': return ARROW_RIGHT;
          case 'D': return ARROW_LEFT;
          case 'H': return HOME_KEY;
          case 'F': return END_KEY;
        }
      }
    } else if (seq[0] == 'O') {
      switch (seq[1]) {
        case 'H': return HOME_KEY;
        case 'F': return END_KEY;
      }
    }

    return '\x1b';
  } else {
    return c;
  }
}

then deal with the key entered:

void editorProcessKeypress() {
  static int quit_times = KILO_QUIT_TIMES;

  int c = editorReadKey();

  switch (c) {
    case '\r':
      editorInsertNewline();
      break;

he first handle enter key with '\r'.I copy the same code,but when I create a new file,type a,then enter,then type b,the screen show this:

a (cursor)
b

but it should be look like this:

a
b(cursor)

which means after type enter,the cursor should be at the end of new line,but it add a 'space' in the first line

If I comment the kilo's code which handle the enter key:

\\case '\r':
      \\editorInsertNewline();
     \\ break;

then got the same error with my code on rpi4 bare metal.so I doubt maybe when I press enter,I can't catch it by \r

so how to catch the code when I press enter key if I set the raw mode:mConsole.SetOptions(0);

Thanks!

[rsta2]

The code of the Enter key in non-canonical mode is '\n' (== '\x0A').