software/c++/ruwaicom/src/libgpio/gpio.h

   1 /*--------------------------------------------------------------------------*/
   2 // LICENSE
   3 //
   4 // This file is part of ruwai.
   5 //
   6 // If you use ruwai_parser in any program or publication, please inform and
   7 // acknowledge its author Stefan Mertl (stefan@mertl-research.at).
   8 //
   9 // ruwai is free software: you can redistribute it and/or modify
  10 // it under the terms of the GNU General Public License as published by
  11 // the Free Software Foundation, either version 3 of the License, or
  12 // (at your option) any later version.
  13 //
  14 // This program is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18 //
  19 // You should have received a copy of the GNU General Public License
  20 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 /*--------------------------------------------------------------------------*/
  22
  23 #ifndef GPIO_H
  24 #define GPIO_H
  25
  26 #define GPIO_PATH "/sys/class/gpio/"
  27
  28 #include <string>
  29
  30 typedef enum gpio_direction_e {
  31     INPUT = 0,
  32     OUTPUT = 1
  33 } gpio_direction_t;
  34
  35
  36 typedef enum gpio_value_e {
  37     LOW = 0,
  38     HIGH = 1
  39 }gpio_value_t;
  40
  41
  42 class GPIO {
  43
  44     private:
  45         int number;         // The GPIO number of the object.
  46         std::string name;        // The name of the GPIO.
  47         std::string path;        // The full path to the GPIO.
  48
  49
  50     public:
  51         GPIO(int gpio_number);
  52         virtual ~GPIO();
  53
  54         virtual int set_direction(gpio_direction_t);
  55         virtual int set_value(gpio_value_t);
  56
  57     private:
  58         int export_gpio(void);
  59         int unexport_gpio(void);
  60         int write(std::string path, std::string filename, std::string value);
  61         int write(std::string path, std::string filename, int value);
  62 };
  63
  64
  65 #endif /* GPIO_H */