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mbed 2

This is the mbed 2 library. If you'd like to learn about Mbed OS please see the mbed-os docs.

drivers/DigitalInOut.h@157:e7ca05fa8600, 2017-11-09 (annotated)

Committer:
AnnaBridge
Date:
Thu Nov 09 11:14:10 2017 +0000
Revision:
157:e7ca05fa8600
Parent:
156:ff21514d8981
Child:
170:e95d10626187
Release 155 of the mbed library.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 156:ff21514d8981 1 /* mbed Microcontroller Library
AnnaBridge 156:ff21514d8981 2 * Copyright (c) 2006-2013 ARM Limited
AnnaBridge 156:ff21514d8981 3 *
AnnaBridge 156:ff21514d8981 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 156:ff21514d8981 5 * you may not use this file except in compliance with the License.
AnnaBridge 156:ff21514d8981 6 * You may obtain a copy of the License at
AnnaBridge 156:ff21514d8981 7 *
AnnaBridge 156:ff21514d8981 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 156:ff21514d8981 9 *
AnnaBridge 156:ff21514d8981 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 156:ff21514d8981 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 156:ff21514d8981 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 156:ff21514d8981 13 * See the License for the specific language governing permissions and
AnnaBridge 156:ff21514d8981 14 * limitations under the License.
AnnaBridge 156:ff21514d8981 15 */
AnnaBridge 156:ff21514d8981 16 #ifndef MBED_DIGITALINOUT_H
AnnaBridge 156:ff21514d8981 17 #define MBED_DIGITALINOUT_H
AnnaBridge 156:ff21514d8981 18
AnnaBridge 156:ff21514d8981 19 #include "platform/platform.h"
AnnaBridge 156:ff21514d8981 20
AnnaBridge 156:ff21514d8981 21 #include "hal/gpio_api.h"
AnnaBridge 156:ff21514d8981 22 #include "platform/mbed_critical.h"
AnnaBridge 156:ff21514d8981 23
AnnaBridge 156:ff21514d8981 24 namespace mbed {
AnnaBridge 156:ff21514d8981 25 /** \addtogroup drivers */
AnnaBridge 156:ff21514d8981 26
AnnaBridge 156:ff21514d8981 27 /** A digital input/output, used for setting or reading a bi-directional pin
AnnaBridge 156:ff21514d8981 28 *
AnnaBridge 156:ff21514d8981 29 * @note Synchronization level: Interrupt safe
AnnaBridge 156:ff21514d8981 30 * @ingroup drivers
AnnaBridge 156:ff21514d8981 31 */
AnnaBridge 156:ff21514d8981 32 class DigitalInOut {
AnnaBridge 156:ff21514d8981 33
AnnaBridge 156:ff21514d8981 34 public:
AnnaBridge 156:ff21514d8981 35 /** Create a DigitalInOut connected to the specified pin
AnnaBridge 156:ff21514d8981 36 *
AnnaBridge 156:ff21514d8981 37 * @param pin DigitalInOut pin to connect to
AnnaBridge 156:ff21514d8981 38 */
AnnaBridge 156:ff21514d8981 39 DigitalInOut(PinName pin) : gpio() {
AnnaBridge 156:ff21514d8981 40 // No lock needed in the constructor
AnnaBridge 156:ff21514d8981 41 gpio_init_in(&gpio, pin);
AnnaBridge 156:ff21514d8981 42 }
AnnaBridge 156:ff21514d8981 43
AnnaBridge 156:ff21514d8981 44 /** Create a DigitalInOut connected to the specified pin
AnnaBridge 156:ff21514d8981 45 *
AnnaBridge 156:ff21514d8981 46 * @param pin DigitalInOut pin to connect to
AnnaBridge 156:ff21514d8981 47 * @param direction the initial direction of the pin
AnnaBridge 156:ff21514d8981 48 * @param mode the initial mode of the pin
AnnaBridge 156:ff21514d8981 49 * @param value the initial value of the pin if is an output
AnnaBridge 156:ff21514d8981 50 */
AnnaBridge 156:ff21514d8981 51 DigitalInOut(PinName pin, PinDirection direction, PinMode mode, int value) : gpio() {
AnnaBridge 156:ff21514d8981 52 // No lock needed in the constructor
AnnaBridge 156:ff21514d8981 53 gpio_init_inout(&gpio, pin, direction, mode, value);
AnnaBridge 156:ff21514d8981 54 }
AnnaBridge 156:ff21514d8981 55
AnnaBridge 156:ff21514d8981 56 /** Set the output, specified as 0 or 1 (int)
AnnaBridge 156:ff21514d8981 57 *
AnnaBridge 156:ff21514d8981 58 * @param value An integer specifying the pin output value,
AnnaBridge 156:ff21514d8981 59 * 0 for logical 0, 1 (or any other non-zero value) for logical 1
AnnaBridge 156:ff21514d8981 60 */
AnnaBridge 156:ff21514d8981 61 void write(int value) {
AnnaBridge 156:ff21514d8981 62 // Thread safe / atomic HAL call
AnnaBridge 156:ff21514d8981 63 gpio_write(&gpio, value);
AnnaBridge 156:ff21514d8981 64 }
AnnaBridge 156:ff21514d8981 65
AnnaBridge 156:ff21514d8981 66 /** Return the output setting, represented as 0 or 1 (int)
AnnaBridge 156:ff21514d8981 67 *
AnnaBridge 156:ff21514d8981 68 * @returns
AnnaBridge 156:ff21514d8981 69 * an integer representing the output setting of the pin if it is an output,
AnnaBridge 156:ff21514d8981 70 * or read the input if set as an input
AnnaBridge 156:ff21514d8981 71 */
AnnaBridge 156:ff21514d8981 72 int read() {
AnnaBridge 156:ff21514d8981 73 // Thread safe / atomic HAL call
AnnaBridge 156:ff21514d8981 74 return gpio_read(&gpio);
AnnaBridge 156:ff21514d8981 75 }
AnnaBridge 156:ff21514d8981 76
AnnaBridge 156:ff21514d8981 77 /** Set as an output
AnnaBridge 156:ff21514d8981 78 */
AnnaBridge 156:ff21514d8981 79 void output() {
AnnaBridge 156:ff21514d8981 80 core_util_critical_section_enter();
AnnaBridge 156:ff21514d8981 81 gpio_dir(&gpio, PIN_OUTPUT);
AnnaBridge 156:ff21514d8981 82 core_util_critical_section_exit();
AnnaBridge 156:ff21514d8981 83 }
AnnaBridge 156:ff21514d8981 84
AnnaBridge 156:ff21514d8981 85 /** Set as an input
AnnaBridge 156:ff21514d8981 86 */
AnnaBridge 156:ff21514d8981 87 void input() {
AnnaBridge 156:ff21514d8981 88 core_util_critical_section_enter();
AnnaBridge 156:ff21514d8981 89 gpio_dir(&gpio, PIN_INPUT);
AnnaBridge 156:ff21514d8981 90 core_util_critical_section_exit();
AnnaBridge 156:ff21514d8981 91 }
AnnaBridge 156:ff21514d8981 92
AnnaBridge 156:ff21514d8981 93 /** Set the input pin mode
AnnaBridge 156:ff21514d8981 94 *
AnnaBridge 156:ff21514d8981 95 * @param pull PullUp, PullDown, PullNone, OpenDrain
AnnaBridge 156:ff21514d8981 96 */
AnnaBridge 156:ff21514d8981 97 void mode(PinMode pull) {
AnnaBridge 156:ff21514d8981 98 core_util_critical_section_enter();
AnnaBridge 156:ff21514d8981 99 gpio_mode(&gpio, pull);
AnnaBridge 156:ff21514d8981 100 core_util_critical_section_exit();
AnnaBridge 156:ff21514d8981 101 }
AnnaBridge 156:ff21514d8981 102
AnnaBridge 156:ff21514d8981 103 /** Return the output setting, represented as 0 or 1 (int)
AnnaBridge 156:ff21514d8981 104 *
AnnaBridge 156:ff21514d8981 105 * @returns
AnnaBridge 156:ff21514d8981 106 * Non zero value if pin is connected to uc GPIO
AnnaBridge 156:ff21514d8981 107 * 0 if gpio object was initialized with NC
AnnaBridge 156:ff21514d8981 108 */
AnnaBridge 156:ff21514d8981 109 int is_connected() {
AnnaBridge 156:ff21514d8981 110 // Thread safe / atomic HAL call
AnnaBridge 156:ff21514d8981 111 return gpio_is_connected(&gpio);
AnnaBridge 156:ff21514d8981 112 }
AnnaBridge 156:ff21514d8981 113
AnnaBridge 156:ff21514d8981 114 /** A shorthand for write()
AnnaBridge 156:ff21514d8981 115 * \sa DigitalInOut::write()
AnnaBridge 156:ff21514d8981 116 */
AnnaBridge 156:ff21514d8981 117 DigitalInOut& operator= (int value) {
AnnaBridge 156:ff21514d8981 118 // Underlying write is thread safe
AnnaBridge 156:ff21514d8981 119 write(value);
AnnaBridge 156:ff21514d8981 120 return *this;
AnnaBridge 156:ff21514d8981 121 }
AnnaBridge 156:ff21514d8981 122
AnnaBridge 156:ff21514d8981 123 /** A shorthand for write()
AnnaBridge 156:ff21514d8981 124 * \sa DigitalInOut::write()
AnnaBridge 156:ff21514d8981 125 */
AnnaBridge 156:ff21514d8981 126 DigitalInOut& operator= (DigitalInOut& rhs) {
AnnaBridge 156:ff21514d8981 127 core_util_critical_section_enter();
AnnaBridge 156:ff21514d8981 128 write(rhs.read());
AnnaBridge 156:ff21514d8981 129 core_util_critical_section_exit();
AnnaBridge 156:ff21514d8981 130 return *this;
AnnaBridge 156:ff21514d8981 131 }
AnnaBridge 156:ff21514d8981 132
AnnaBridge 156:ff21514d8981 133 /** A shorthand for read()
AnnaBridge 156:ff21514d8981 134 * \sa DigitalInOut::read()
AnnaBridge 156:ff21514d8981 135 */
AnnaBridge 156:ff21514d8981 136 operator int() {
AnnaBridge 156:ff21514d8981 137 // Underlying call is thread safe
AnnaBridge 156:ff21514d8981 138 return read();
AnnaBridge 156:ff21514d8981 139 }
AnnaBridge 156:ff21514d8981 140
AnnaBridge 156:ff21514d8981 141 protected:
AnnaBridge 156:ff21514d8981 142 gpio_t gpio;
AnnaBridge 156:ff21514d8981 143 };
AnnaBridge 156:ff21514d8981 144
AnnaBridge 156:ff21514d8981 145 } // namespace mbed
AnnaBridge 156:ff21514d8981 146
AnnaBridge 156:ff21514d8981 147 #endif