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PortOut.h
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 #ifndef MBED_PORTOUT_H 00017 #define MBED_PORTOUT_H 00018 00019 #include "platform/platform.h" 00020 00021 #if defined (DEVICE_PORTOUT) || defined(DOXYGEN_ONLY) 00022 00023 #include "hal/port_api.h" 00024 #include "platform/mbed_critical.h" 00025 00026 namespace mbed { 00027 /** \addtogroup drivers */ 00028 /** A multiple pin digital out 00029 * 00030 * @note Synchronization level: Interrupt safe 00031 * 00032 * Example: 00033 * @code 00034 * // Toggle all four LEDs 00035 * 00036 * #include "mbed.h" 00037 * 00038 * // LED1 = P1.18 LED2 = P1.20 LED3 = P1.21 LED4 = P1.23 00039 * #define LED_MASK 0x00B40000 00040 * 00041 * PortOut ledport(Port1, LED_MASK); 00042 * 00043 * int main() { 00044 * while(1) { 00045 * ledport = LED_MASK; 00046 * wait(1); 00047 * ledport = 0; 00048 * wait(1); 00049 * } 00050 * } 00051 * @endcode 00052 * @ingroup drivers 00053 */ 00054 class PortOut { 00055 public: 00056 00057 /** Create an PortOut, connected to the specified port 00058 * 00059 * @param port Port to connect to (Port0-Port5) 00060 * @param mask A bitmask to identify which bits in the port should be included (0 - ignore) 00061 */ 00062 PortOut(PortName port, int mask = 0xFFFFFFFF) 00063 { 00064 core_util_critical_section_enter(); 00065 port_init(&_port, port, mask, PIN_OUTPUT); 00066 core_util_critical_section_exit(); 00067 } 00068 00069 /** Write the value to the output port 00070 * 00071 * @param value An integer specifying a bit to write for every corresponding PortOut pin 00072 */ 00073 void write(int value) 00074 { 00075 port_write(&_port, value); 00076 } 00077 00078 /** Read the value currently output on the port 00079 * 00080 * @returns 00081 * An integer with each bit corresponding to associated PortOut pin setting 00082 */ 00083 int read() 00084 { 00085 return port_read(&_port); 00086 } 00087 00088 /** A shorthand for write() 00089 * \sa PortOut::write() 00090 */ 00091 PortOut &operator= (int value) 00092 { 00093 write(value); 00094 return *this; 00095 } 00096 00097 /** A shorthand for read() 00098 * \sa PortOut::read() 00099 */ 00100 PortOut &operator= (PortOut &rhs) 00101 { 00102 write(rhs.read()); 00103 return *this; 00104 } 00105 00106 /** A shorthand for read() 00107 * \sa PortOut::read() 00108 */ 00109 operator int() 00110 { 00111 return read(); 00112 } 00113 00114 private: 00115 port_t _port; 00116 }; 00117 00118 } // namespace mbed 00119 00120 #endif 00121 00122 #endif
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