c_gpio.h

/*
 * 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(void);
void setup_gpio(int gpio, int direction, int pud);
void output_gpio(int gpio, int value);
int input_gpio(int gpio);
void cleanup(void);
int gpio_function(int gpio);
void set_pullupdn(int gpio, int pud);

#define SETUP_OK          0
#define SETUP_DEVMEM_FAIL 1
#define SETUP_MALLOC_FAIL 2
#define SETUP_MMAP_FAIL   3

#define INPUT  1 // is really 0 for control register!
#define OUTPUT 0 // is really 1 for control register!
#define ALT0   4

#define HIGH 1
#define LOW  0

#define PUD_OFF  0
#define PUD_DOWN 1
#define PUD_UP   2