serial_lines.h

Go to the documentation of this file.

// Copyright (c) 2024 anabrid GmbH
// Contact: https://www.anabrid.com/licensing/
//
// SPDX-License-Identifier: MIT OR GPL-2.0-or-later
 
#include <Arduino.h>
 
namespace utils {
 
class SerialLineReader {
public:
  static constexpr int serial_buffer_size = 4096;
  char serial_buffer[serial_buffer_size];
  int serial_buffer_pos = 0;
 
  bool echo = true; 
 
  char *line_available() {
    if (Serial.available() > 0) {
      char in = Serial.read();
 
      if (echo) {
        Serial.print(in);
        Serial.flush();
      }
 
      if (in == '\n') {
        serial_buffer[serial_buffer_pos] = '\0';
        serial_buffer_pos = 0;
        return serial_buffer;
      } else if (serial_buffer_pos < serial_buffer_size - 1) { // Avoid buffer overflow
        serial_buffer[serial_buffer_pos++] = in;
      } else {
        // buffer is full, flush it anyway.
        serial_buffer[serial_buffer_pos - 2] = '\n';
        serial_buffer[serial_buffer_pos - 1] = '\0';
        serial_buffer_pos = 0;
        return serial_buffer;
      }
    }
    return NULL;
  }
};
 
} // namespace utils