File content as of revision 0:fd0d7bdfcdc2:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2012 ARM Limited
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#ifndef MBED_DIGITALIN_H
#define MBED_DIGITALIN_H

#include "platform.h"

#include "gpio_api.h"

namespace mbed {

/** A digital input, used for reading the state of a pin
 *
 * Example:
 * @code
 * // Flash an LED while a DigitalIn is true
 * 
 * #include "mbed.h"
 * 
 * DigitalIn enable(p5);
 * DigitalOut led(LED1);
 * 
 * int main() {
 *     while(1) {
 *         if(enable) {
 *             led = !led;
 *         }
 *         wait(0.25);
 *     }
 * }
 * @endcode
 */
class DigitalIn {

public:
    /** Create a DigitalIn connected to the specified pin
     *
     *  @param pin DigitalIn pin to connect to
     *  @param name (optional) A string to identify the object
     */
    DigitalIn(PinName pin) {
        gpio_init(&gpio, pin, PIN_INPUT);
    }
    
    /** Read the input, represented as 0 or 1 (int)
     *
     *  @returns
     *    An integer representing the state of the input pin, 
     *    0 for logical 0, 1 for logical 1
     */
    int read() {
        return gpio_read(&gpio);
    }
    
    /** Set the input pin mode
     *
     *  @param mode PullUp, PullDown, PullNone, OpenDrain
     */
    void mode(PinMode pull) {
        gpio_mode(&gpio, pull);
    }
    
#ifdef MBED_OPERATORS
    /** An operator shorthand for read()
     */
    operator int() {
        return read();
    }
#endif

protected:
    gpio_t gpio;
};

} // namespace mbed

#endif