Method get_serial_commands

Marlin/src/gcode/queue.cpp:412–559

* Get all commands waiting on the serial port and queue them. * Exit when the buffer is full or when no more characters are * left on the serial port. */

 * left on the serial port.
 */
void GCodeQueue::get_serial_commands() {
  #if ENABLED(BINARY_FILE_TRANSFER)
    if (card.flag.binary_mode) {
      /**
       * For binary stream file transfer, use serial_line_buffer as the working
       * receive buffer (which limits the packet size to MAX_CMD_SIZE).
       * The receive buffer also limits the packet size for reliable transmission.
       */
      binaryStream[card.transfer_port_index.index].receive(serial_state[card.transfer_port_index.index].line_buffer);
      return;
    }
  #endif

  // If the command buffer is empty for too long,
  // send "wait" to indicate Marlin is still waiting.
  #if NO_TIMEOUTS > 0
    const millis_t ms = millis();
    if (ring_buffer.empty() && !any_serial_data_available() && ELAPSED(ms, last_command_time, NO_TIMEOUTS)) {
      SERIAL_ECHOLNPGM(STR_WAIT);
      last_command_time = ms;
    }
  #endif

  // Loop while serial characters are incoming and the queue is not full
  for (bool hadData = true; hadData;) {
    // Unless a serial port has data, this will exit on next iteration
    hadData = false;

    for (uint8_t p = 0; p < NUM_SERIAL; ++p) {
      // Check if the queue is full and exit if it is.
      if (ring_buffer.full()) return;

      // No data for this port ? Skip it
      if (!serial_data_available(p)) continue;

      // Ok, we have some data to process, let's make progress here
      hadData = true;

      const int c = read_serial(p);
      if (c < 0) {
        // This should never happen, let's log it
        PORT_REDIRECT(SERIAL_PORTMASK(p));     // Reply to the serial port that sent the command
        // Crash here to get more information why it failed
        BUG_ON("SP available but read -1");
        SERIAL_ERROR_MSG(STR_ERR_SERIAL_MISMATCH);
        SERIAL_FLUSH();
        continue;
      }

      const char serial_char = (char)c;
      SerialState &serial = serial_state[p];

      if (ISEOL(serial_char)) {

        // Reset our state, continue if the line was empty
        if (process_line_done(serial.input_state, serial.line_buffer, serial.count))
          continue;