tmk_core/tool/mbed/mbed-sdk/libraries/mbed/api/PortInOut.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_PORTINOUT_H
  17 #define MBED_PORTINOUT_H
  18
  19 #include "platform.h"
  20
  21 #if DEVICE_PORTINOUT
  22
  23 #include "port_api.h"
  24
  25 namespace mbed {
  26
  27 /** A multiple pin digital in/out used to set/read multiple bi-directional pins
  28  */
  29 class PortInOut {
  30 public:
  31
  32     /** Create an PortInOut, connected to the specified port
  33      *
  34      *  @param port Port to connect to (Port0-Port5)
  35      *  @param mask A bitmask to identify which bits in the port should be included (0 - ignore)
  36      */
  37     PortInOut(PortName port, int mask = 0xFFFFFFFF) {
  38         port_init(&_port, port, mask, PIN_INPUT);
  39     }
  40
  41     /** Write the value to the output port
  42      *
  43      *  @param value An integer specifying a bit to write for every corresponding port pin
  44      */
  45     void write(int value) {
  46         port_write(&_port, value);
  47     }
  48
  49     /** Read the value currently output on the port
  50      *
  51      *  @returns
  52      *    An integer with each bit corresponding to associated port pin setting
  53      */
  54     int read() {
  55         return port_read(&_port);
  56     }
  57
  58     /** Set as an output
  59      */
  60     void output() {
  61         port_dir(&_port, PIN_OUTPUT);
  62     }
  63
  64     /** Set as an input
  65      */
  66     void input() {
  67         port_dir(&_port, PIN_INPUT);
  68     }
  69
  70     /** Set the input pin mode
  71      *
  72      *  @param mode PullUp, PullDown, PullNone, OpenDrain
  73      */
  74     void mode(PinMode mode) {
  75         port_mode(&_port, mode);
  76     }
  77
  78     /** A shorthand for write()
  79      */
  80     PortInOut& operator= (int value) {
  81         write(value);
  82         return *this;
  83     }
  84
  85     PortInOut& operator= (PortInOut& rhs) {
  86         write(rhs.read());
  87         return *this;
  88     }
  89
  90     /** A shorthand for read()
  91      */
  92     operator int() {
  93         return read();
  94     }
  95
  96 private:
  97     port_t _port;
  98 };
  99
 100 } // namespace mbed
 101
 102 #endif
 103
 104 #endif