Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

drivers/PortOut.h@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #ifndef MBED_PORTOUT_H
elessair 0:f269e3021894 17 #define MBED_PORTOUT_H
elessair 0:f269e3021894 18
elessair 0:f269e3021894 19 #include "platform/platform.h"
elessair 0:f269e3021894 20
elessair 0:f269e3021894 21 #if DEVICE_PORTOUT
elessair 0:f269e3021894 22
elessair 0:f269e3021894 23 #include "hal/port_api.h"
elessair 0:f269e3021894 24 #include "platform/critical.h"
elessair 0:f269e3021894 25
elessair 0:f269e3021894 26 namespace mbed {
elessair 0:f269e3021894 27 /** \addtogroup drivers */
elessair 0:f269e3021894 28 /** @{*/
elessair 0:f269e3021894 29 /** A multiple pin digital out
elessair 0:f269e3021894 30 *
elessair 0:f269e3021894 31 * @Note Synchronization level: Interrupt safe
elessair 0:f269e3021894 32 *
elessair 0:f269e3021894 33 * Example:
elessair 0:f269e3021894 34 * @code
elessair 0:f269e3021894 35 * // Toggle all four LEDs
elessair 0:f269e3021894 36 *
elessair 0:f269e3021894 37 * #include "mbed.h"
elessair 0:f269e3021894 38 *
elessair 0:f269e3021894 39 * // LED1 = P1.18 LED2 = P1.20 LED3 = P1.21 LED4 = P1.23
elessair 0:f269e3021894 40 * #define LED_MASK 0x00B40000
elessair 0:f269e3021894 41 *
elessair 0:f269e3021894 42 * PortOut ledport(Port1, LED_MASK);
elessair 0:f269e3021894 43 *
elessair 0:f269e3021894 44 * int main() {
elessair 0:f269e3021894 45 * while(1) {
elessair 0:f269e3021894 46 * ledport = LED_MASK;
elessair 0:f269e3021894 47 * wait(1);
elessair 0:f269e3021894 48 * ledport = 0;
elessair 0:f269e3021894 49 * wait(1);
elessair 0:f269e3021894 50 * }
elessair 0:f269e3021894 51 * }
elessair 0:f269e3021894 52 * @endcode
elessair 0:f269e3021894 53 */
elessair 0:f269e3021894 54 class PortOut {
elessair 0:f269e3021894 55 public:
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 /** Create an PortOut, connected to the specified port
elessair 0:f269e3021894 58 *
elessair 0:f269e3021894 59 * @param port Port to connect to (Port0-Port5)
elessair 0:f269e3021894 60 * @param mask A bitmask to identify which bits in the port should be included (0 - ignore)
elessair 0:f269e3021894 61 */
elessair 0:f269e3021894 62 PortOut(PortName port, int mask = 0xFFFFFFFF) {
elessair 0:f269e3021894 63 core_util_critical_section_enter();
elessair 0:f269e3021894 64 port_init(&_port, port, mask, PIN_OUTPUT);
elessair 0:f269e3021894 65 core_util_critical_section_exit();
elessair 0:f269e3021894 66 }
elessair 0:f269e3021894 67
elessair 0:f269e3021894 68 /** Write the value to the output port
elessair 0:f269e3021894 69 *
elessair 0:f269e3021894 70 * @param value An integer specifying a bit to write for every corresponding PortOut pin
elessair 0:f269e3021894 71 */
elessair 0:f269e3021894 72 void write(int value) {
elessair 0:f269e3021894 73 port_write(&_port, value);
elessair 0:f269e3021894 74 }
elessair 0:f269e3021894 75
elessair 0:f269e3021894 76 /** Read the value currently output on the port
elessair 0:f269e3021894 77 *
elessair 0:f269e3021894 78 * @returns
elessair 0:f269e3021894 79 * An integer with each bit corresponding to associated PortOut pin setting
elessair 0:f269e3021894 80 */
elessair 0:f269e3021894 81 int read() {
elessair 0:f269e3021894 82 return port_read(&_port);
elessair 0:f269e3021894 83 }
elessair 0:f269e3021894 84
elessair 0:f269e3021894 85 /** A shorthand for write()
elessair 0:f269e3021894 86 */
elessair 0:f269e3021894 87 PortOut& operator= (int value) {
elessair 0:f269e3021894 88 write(value);
elessair 0:f269e3021894 89 return *this;
elessair 0:f269e3021894 90 }
elessair 0:f269e3021894 91
elessair 0:f269e3021894 92 PortOut& operator= (PortOut& rhs) {
elessair 0:f269e3021894 93 write(rhs.read());
elessair 0:f269e3021894 94 return *this;
elessair 0:f269e3021894 95 }
elessair 0:f269e3021894 96
elessair 0:f269e3021894 97 /** A shorthand for read()
elessair 0:f269e3021894 98 */
elessair 0:f269e3021894 99 operator int() {
elessair 0:f269e3021894 100 return read();
elessair 0:f269e3021894 101 }
elessair 0:f269e3021894 102
elessair 0:f269e3021894 103 private:
elessair 0:f269e3021894 104 port_t _port;
elessair 0:f269e3021894 105 };
elessair 0:f269e3021894 106
elessair 0:f269e3021894 107 } // namespace mbed
elessair 0:f269e3021894 108
elessair 0:f269e3021894 109 #endif
elessair 0:f269e3021894 110
elessair 0:f269e3021894 111 #endif
elessair 0:f269e3021894 112
elessair 0:f269e3021894 113 /** @}*/