text: /*
   * This file is part of RPIO.
   *
   * Copyright
   *
   *     Copyright (C) 2013 Chris Hager <chris@linuxuser.at>
   *
   * License
   *
   *     This program is free software: you can redistribute it and/or modify
   *     it under the terms of the GNU Lesser General Public License as published
   *     by the Free Software Foundation, either version 3 of the License, or
   *     (at your option) any later version.
   *
   *     This program is distributed in the hope that it will be useful,
   *     but WITHOUT ANY WARRANTY; without even the implied warranty of
   *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *     GNU Lesser General Public License for more details at
   *     <http://www.gnu.org/licenses/lgpl-3.0-standalone.html>
   *
   * Documentation
   *
   *     http://pythonhosted.org/RPIO
   */
  int setup(int pw_incr_us, int hw);
  void shutdown(void);
  void set_loglevel(int level);
  
  int init_channel(int channel, int subcycle_time_us);
  int clear_channel(int channel);
  int clear_channel_gpio(int channel, int gpio);
  int print_channel(int channel);
  
  int add_channel_pulse(int channel, int gpio, int width_start, int width);
  char* get_error_message(void);
  void set_softfatal(int enabled);
  
  int is_setup(void);
  int is_channel_initialized(int channel);
  int get_pulse_incr_us(void);
  int get_channel_subcycle_time_us(int channel);
  
  #define DELAY_VIA_PWM   0
  #define DELAY_VIA_PCM   1
  
  #define LOG_LEVEL_DEBUG 0
  #define LOG_LEVEL_ERRORS 1
  #define LOG_LEVEL_DEFAULT LOG_LEVEL_DEBUG
  
  // Default subcycle time
  #define SUBCYCLE_TIME_US_DEFAULT 20000
  
  // Subcycle minimum. We kept seeing no signals and strange behavior of the RPi
  #define SUBCYCLE_TIME_US_MIN 3000
  
  // Default pulse-width-increment-granularity
  #define PULSE_WIDTH_INCREMENT_GRANULARITY_US_DEFAULT 10
  