Iftikhar Aziz / mbed-dev

4545

Dependents:   LSS_Rev_1

Fork of mbed-dev by Umar Naeem

drivers/DigitalInOut.h@166:33361e55dd8c, 2017-08-23 (annotated)

Committer:
iftaziz
Date:
Wed Aug 23 10:32:38 2017 +0000
Revision:
166:33361e55dd8c
Parent:
160:d5399cc887bb 
r1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2013 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #ifndef MBED_DIGITALINOUT_H
<> 149:156823d33999 17 #define MBED_DIGITALINOUT_H
<> 149:156823d33999 18
<> 149:156823d33999 19 #include "platform/platform.h"
<> 149:156823d33999 20
<> 149:156823d33999 21 #include "hal/gpio_api.h"
<> 160:d5399cc887bb 22 #include "platform/mbed_critical.h"
<> 149:156823d33999 23
<> 149:156823d33999 24 namespace mbed {
<> 149:156823d33999 25 /** \addtogroup drivers */
<> 149:156823d33999 26 /** @{*/
<> 149:156823d33999 27
<> 149:156823d33999 28 /** A digital input/output, used for setting or reading a bi-directional pin
<> 149:156823d33999 29 *
<> 149:156823d33999 30 * @Note Synchronization level: Interrupt safe
<> 149:156823d33999 31 */
<> 149:156823d33999 32 class DigitalInOut {
<> 149:156823d33999 33
<> 149:156823d33999 34 public:
<> 149:156823d33999 35 /** Create a DigitalInOut connected to the specified pin
<> 149:156823d33999 36 *
<> 149:156823d33999 37 * @param pin DigitalInOut pin to connect to
<> 149:156823d33999 38 */
<> 149:156823d33999 39 DigitalInOut(PinName pin) : gpio() {
<> 149:156823d33999 40 // No lock needed in the constructor
<> 149:156823d33999 41 gpio_init_in(&gpio, pin);
<> 149:156823d33999 42 }
<> 149:156823d33999 43
<> 149:156823d33999 44 /** Create a DigitalInOut connected to the specified pin
<> 149:156823d33999 45 *
<> 149:156823d33999 46 * @param pin DigitalInOut pin to connect to
<> 149:156823d33999 47 * @param direction the initial direction of the pin
<> 149:156823d33999 48 * @param mode the initial mode of the pin
<> 149:156823d33999 49 * @param value the initial value of the pin if is an output
<> 149:156823d33999 50 */
<> 149:156823d33999 51 DigitalInOut(PinName pin, PinDirection direction, PinMode mode, int value) : gpio() {
<> 149:156823d33999 52 // No lock needed in the constructor
<> 149:156823d33999 53 gpio_init_inout(&gpio, pin, direction, mode, value);
<> 149:156823d33999 54 }
<> 149:156823d33999 55
<> 149:156823d33999 56 /** Set the output, specified as 0 or 1 (int)
<> 149:156823d33999 57 *
<> 149:156823d33999 58 * @param value An integer specifying the pin output value,
<> 149:156823d33999 59 * 0 for logical 0, 1 (or any other non-zero value) for logical 1
<> 149:156823d33999 60 */
<> 149:156823d33999 61 void write(int value) {
<> 149:156823d33999 62 // Thread safe / atomic HAL call
<> 149:156823d33999 63 gpio_write(&gpio, value);
<> 149:156823d33999 64 }
<> 149:156823d33999 65
<> 149:156823d33999 66 /** Return the output setting, represented as 0 or 1 (int)
<> 149:156823d33999 67 *
<> 149:156823d33999 68 * @returns
<> 149:156823d33999 69 * an integer representing the output setting of the pin if it is an output,
<> 149:156823d33999 70 * or read the input if set as an input
<> 149:156823d33999 71 */
<> 149:156823d33999 72 int read() {
<> 149:156823d33999 73 // Thread safe / atomic HAL call
<> 149:156823d33999 74 return gpio_read(&gpio);
<> 149:156823d33999 75 }
<> 149:156823d33999 76
<> 149:156823d33999 77 /** Set as an output
<> 149:156823d33999 78 */
<> 149:156823d33999 79 void output() {
<> 149:156823d33999 80 core_util_critical_section_enter();
<> 149:156823d33999 81 gpio_dir(&gpio, PIN_OUTPUT);
<> 149:156823d33999 82 core_util_critical_section_exit();
<> 149:156823d33999 83 }
<> 149:156823d33999 84
<> 149:156823d33999 85 /** Set as an input
<> 149:156823d33999 86 */
<> 149:156823d33999 87 void input() {
<> 149:156823d33999 88 core_util_critical_section_enter();
<> 149:156823d33999 89 gpio_dir(&gpio, PIN_INPUT);
<> 149:156823d33999 90 core_util_critical_section_exit();
<> 149:156823d33999 91 }
<> 149:156823d33999 92
<> 149:156823d33999 93 /** Set the input pin mode
<> 149:156823d33999 94 *
<> 149:156823d33999 95 * @param mode PullUp, PullDown, PullNone, OpenDrain
<> 149:156823d33999 96 */
<> 149:156823d33999 97 void mode(PinMode pull) {
<> 149:156823d33999 98 core_util_critical_section_enter();
<> 149:156823d33999 99 gpio_mode(&gpio, pull);
<> 149:156823d33999 100 core_util_critical_section_exit();
<> 149:156823d33999 101 }
<> 149:156823d33999 102
<> 149:156823d33999 103 /** Return the output setting, represented as 0 or 1 (int)
<> 149:156823d33999 104 *
<> 149:156823d33999 105 * @returns
<> 149:156823d33999 106 * Non zero value if pin is connected to uc GPIO
<> 149:156823d33999 107 * 0 if gpio object was initialized with NC
<> 149:156823d33999 108 */
<> 149:156823d33999 109 int is_connected() {
<> 149:156823d33999 110 // Thread safe / atomic HAL call
<> 149:156823d33999 111 return gpio_is_connected(&gpio);
<> 149:156823d33999 112 }
<> 149:156823d33999 113
<> 149:156823d33999 114 /** A shorthand for write()
<> 149:156823d33999 115 */
<> 149:156823d33999 116 DigitalInOut& operator= (int value) {
<> 149:156823d33999 117 // Underlying write is thread safe
<> 149:156823d33999 118 write(value);
<> 149:156823d33999 119 return *this;
<> 149:156823d33999 120 }
<> 149:156823d33999 121
<> 149:156823d33999 122 DigitalInOut& operator= (DigitalInOut& rhs) {
<> 149:156823d33999 123 core_util_critical_section_enter();
<> 149:156823d33999 124 write(rhs.read());
<> 149:156823d33999 125 core_util_critical_section_exit();
<> 149:156823d33999 126 return *this;
<> 149:156823d33999 127 }
<> 149:156823d33999 128
<> 149:156823d33999 129 /** A shorthand for read()
<> 149:156823d33999 130 */
<> 149:156823d33999 131 operator int() {
<> 149:156823d33999 132 // Underlying call is thread safe
<> 149:156823d33999 133 return read();
<> 149:156823d33999 134 }
<> 149:156823d33999 135
<> 149:156823d33999 136 protected:
<> 149:156823d33999 137 gpio_t gpio;
<> 149:156823d33999 138 };
<> 149:156823d33999 139
<> 149:156823d33999 140 } // namespace mbed
<> 149:156823d33999 141
<> 149:156823d33999 142 #endif
<> 149:156823d33999 143
<> 149:156823d33999 144 /** @}*/