tmk_core/tool/mbed/mbed-sdk/libraries/mbed/api/PortOut.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_PORTOUT_H
  17 #define MBED_PORTOUT_H
  18
  19 #include "platform.h"
  20
  21 #if DEVICE_PORTOUT
  22
  23 #include "port_api.h"
  24
  25 namespace mbed {
  26 /** A multiple pin digital out
  27  *
  28  * Example:
  29  * @code
  30  * // Toggle all four LEDs
  31  *
  32  * #include "mbed.h"
  33  *
  34  * // LED1 = P1.18  LED2 = P1.20  LED3 = P1.21  LED4 = P1.23
  35  * #define LED_MASK 0x00B40000
  36  *
  37  * PortOut ledport(Port1, LED_MASK);
  38  *
  39  * int main() {
  40  *     while(1) {
  41  *         ledport = LED_MASK;
  42  *         wait(1);
  43  *         ledport = 0;
  44  *         wait(1);
  45  *     }
  46  * }
  47  * @endcode
  48  */
  49 class PortOut {
  50 public:
  51
  52     /** Create an PortOut, connected to the specified port
  53      *
  54      *  @param port Port to connect to (Port0-Port5)
  55      *  @param mask A bitmask to identify which bits in the port should be included (0 - ignore)
  56      */
  57     PortOut(PortName port, int mask = 0xFFFFFFFF) {
  58         port_init(&_port, port, mask, PIN_OUTPUT);
  59     }
  60
  61     /** Write the value to the output port
  62      *
  63      *  @param value An integer specifying a bit to write for every corresponding PortOut pin
  64      */
  65     void write(int value) {
  66         port_write(&_port, value);
  67     }
  68
  69     /** Read the value currently output on the port
  70      *
  71      *  @returns
  72      *    An integer with each bit corresponding to associated PortOut pin setting
  73      */
  74     int read() {
  75         return port_read(&_port);
  76     }
  77
  78     /** A shorthand for write()
  79      */
  80     PortOut& operator= (int value) {
  81         write(value);
  82         return *this;
  83     }
  84
  85     PortOut& operator= (PortOut& 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