tmk_core/tool/mbed/mbed-sdk/libraries/mbed/api/DigitalInOut.h

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #ifndef MBED_DIGITALINOUT_H
  17 #define MBED_DIGITALINOUT_H
  18
  19 #include "platform.h"
  20
  21 #include "gpio_api.h"
  22
  23 namespace mbed {
  24
  25 /** A digital input/output, used for setting or reading a bi-directional pin
  26  */
  27 class DigitalInOut {
  28
  29 public:
  30     /** Create a DigitalInOut connected to the specified pin
  31      *
  32      *  @param pin DigitalInOut pin to connect to
  33      */
  34     DigitalInOut(PinName pin) : gpio() {
  35         gpio_init_in(&gpio, pin);
  36     }
  37
  38     /** Create a DigitalInOut connected to the specified pin
  39      *
  40      *  @param pin DigitalInOut pin to connect to
  41      *  @param direction the initial direction of the pin
  42      *  @param mode the initial mode of the pin
  43      *  @param value the initial value of the pin if is an output
  44      */
  45     DigitalInOut(PinName pin, PinDirection direction, PinMode mode, int value) : gpio() {
  46         gpio_init_inout(&gpio, pin, direction, mode, value);
  47     }
  48
  49     /** Set the output, specified as 0 or 1 (int)
  50      *
  51      *  @param value An integer specifying the pin output value,
  52      *      0 for logical 0, 1 (or any other non-zero value) for logical 1
  53      */
  54     void write(int value) {
  55         gpio_write(&gpio, value);
  56     }
  57
  58     /** Return the output setting, represented as 0 or 1 (int)
  59      *
  60      *  @returns
  61      *    an integer representing the output setting of the pin if it is an output,
  62      *    or read the input if set as an input
  63      */
  64     int read() {
  65         return gpio_read(&gpio);
  66     }
  67
  68     /** Set as an output
  69      */
  70     void output() {
  71         gpio_dir(&gpio, PIN_OUTPUT);
  72     }
  73
  74     /** Set as an input
  75      */
  76     void input() {
  77         gpio_dir(&gpio, PIN_INPUT);
  78     }
  79
  80     /** Set the input pin mode
  81      *
  82      *  @param mode PullUp, PullDown, PullNone, OpenDrain
  83      */
  84     void mode(PinMode pull) {
  85         gpio_mode(&gpio, pull);
  86     }
  87
  88     /** Return the output setting, represented as 0 or 1 (int)
  89      *
  90      *  @returns
  91      *    Non zero value if pin is connected to uc GPIO
  92      *    0 if gpio object was initialized with NC
  93      */
  94     int is_connected() {
  95         return gpio_is_connected(&gpio);
  96     }
  97
  98 #ifdef MBED_OPERATORS
  99     /** A shorthand for write()
 100      */
 101     DigitalInOut& operator= (int value) {
 102         write(value);
 103         return *this;
 104     }
 105
 106     DigitalInOut& operator= (DigitalInOut& rhs) {
 107         write(rhs.read());
 108         return *this;
 109     }
 110
 111     /** A shorthand for read()
 112      */
 113     operator int() {
 114         return read();
 115     }
 116 #endif
 117
 118 protected:
 119     gpio_t gpio;
 120 };
 121
 122 } // namespace mbed
 123
 124 #endif