John Karatka / mbed

mbed

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drivers/DigitalOut.h@182:57724642e740, 2018-02-16 (annotated)

Committer:
AnnaBridge
Date:
Fri Feb 16 16:09:33 2018 +0000
Revision:
182:57724642e740
Parent:
167:e84263d55307 
mbed-dev library. Release version 159.

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_DIGITALOUT_H
<> 149:156823d33999 17 #define MBED_DIGITALOUT_H
<> 149:156823d33999 18
<> 149:156823d33999 19 #include "platform/platform.h"
<> 149:156823d33999 20 #include "hal/gpio_api.h"
<> 160:d5399cc887bb 21 #include "platform/mbed_critical.h"
<> 149:156823d33999 22
<> 149:156823d33999 23 namespace mbed {
<> 149:156823d33999 24 /** \addtogroup drivers */
<> 149:156823d33999 25
<> 149:156823d33999 26 /** A digital output, used for setting the state of a pin
<> 149:156823d33999 27 *
AnnaBridge 167:e84263d55307 28 * @note Synchronization level: Interrupt safe
<> 149:156823d33999 29 *
<> 149:156823d33999 30 * Example:
<> 149:156823d33999 31 * @code
<> 149:156823d33999 32 * // Toggle a LED
<> 149:156823d33999 33 * #include "mbed.h"
<> 149:156823d33999 34 *
<> 149:156823d33999 35 * DigitalOut led(LED1);
<> 149:156823d33999 36 *
<> 149:156823d33999 37 * int main() {
<> 149:156823d33999 38 * while(1) {
<> 149:156823d33999 39 * led = !led;
<> 149:156823d33999 40 * wait(0.2);
<> 149:156823d33999 41 * }
<> 149:156823d33999 42 * }
<> 149:156823d33999 43 * @endcode
AnnaBridge 167:e84263d55307 44 * @ingroup drivers
<> 149:156823d33999 45 */
<> 149:156823d33999 46 class DigitalOut {
<> 149:156823d33999 47
<> 149:156823d33999 48 public:
<> 149:156823d33999 49 /** Create a DigitalOut connected to the specified pin
<> 149:156823d33999 50 *
<> 149:156823d33999 51 * @param pin DigitalOut pin to connect to
<> 149:156823d33999 52 */
<> 149:156823d33999 53 DigitalOut(PinName pin) : gpio() {
<> 149:156823d33999 54 // No lock needed in the constructor
<> 149:156823d33999 55 gpio_init_out(&gpio, pin);
<> 149:156823d33999 56 }
<> 149:156823d33999 57
<> 149:156823d33999 58 /** Create a DigitalOut connected to the specified pin
<> 149:156823d33999 59 *
<> 149:156823d33999 60 * @param pin DigitalOut pin to connect to
<> 149:156823d33999 61 * @param value the initial pin value
<> 149:156823d33999 62 */
<> 149:156823d33999 63 DigitalOut(PinName pin, int value) : gpio() {
<> 149:156823d33999 64 // No lock needed in the constructor
<> 149:156823d33999 65 gpio_init_out_ex(&gpio, pin, value);
<> 149:156823d33999 66 }
<> 149:156823d33999 67
<> 149:156823d33999 68 /** Set the output, specified as 0 or 1 (int)
<> 149:156823d33999 69 *
<> 149:156823d33999 70 * @param value An integer specifying the pin output value,
<> 149:156823d33999 71 * 0 for logical 0, 1 (or any other non-zero value) for logical 1
<> 149:156823d33999 72 */
<> 149:156823d33999 73 void write(int value) {
<> 149:156823d33999 74 // Thread safe / atomic HAL call
<> 149:156823d33999 75 gpio_write(&gpio, value);
<> 149:156823d33999 76 }
<> 149:156823d33999 77
<> 149:156823d33999 78 /** Return the output setting, represented as 0 or 1 (int)
<> 149:156823d33999 79 *
<> 149:156823d33999 80 * @returns
<> 149:156823d33999 81 * an integer representing the output setting of the pin,
<> 149:156823d33999 82 * 0 for logical 0, 1 for logical 1
<> 149:156823d33999 83 */
<> 149:156823d33999 84 int read() {
<> 149:156823d33999 85 // Thread safe / atomic HAL call
<> 149:156823d33999 86 return gpio_read(&gpio);
<> 149:156823d33999 87 }
<> 149:156823d33999 88
<> 149:156823d33999 89 /** Return the output setting, represented as 0 or 1 (int)
<> 149:156823d33999 90 *
<> 149:156823d33999 91 * @returns
<> 149:156823d33999 92 * Non zero value if pin is connected to uc GPIO
<> 149:156823d33999 93 * 0 if gpio object was initialized with NC
<> 149:156823d33999 94 */
<> 149:156823d33999 95 int is_connected() {
<> 149:156823d33999 96 // Thread safe / atomic HAL call
<> 149:156823d33999 97 return gpio_is_connected(&gpio);
<> 149:156823d33999 98 }
<> 149:156823d33999 99
<> 149:156823d33999 100 /** A shorthand for write()
AnnaBridge 167:e84263d55307 101 * \sa DigitalOut::write()
<> 149:156823d33999 102 */
<> 149:156823d33999 103 DigitalOut& operator= (int value) {
<> 149:156823d33999 104 // Underlying write is thread safe
<> 149:156823d33999 105 write(value);
<> 149:156823d33999 106 return *this;
<> 149:156823d33999 107 }
<> 149:156823d33999 108
AnnaBridge 167:e84263d55307 109 /** A shorthand for write()
AnnaBridge 167:e84263d55307 110 * \sa DigitalOut::write()
AnnaBridge 167:e84263d55307 111 */
<> 149:156823d33999 112 DigitalOut& operator= (DigitalOut& rhs) {
<> 149:156823d33999 113 core_util_critical_section_enter();
<> 149:156823d33999 114 write(rhs.read());
<> 149:156823d33999 115 core_util_critical_section_exit();
<> 149:156823d33999 116 return *this;
<> 149:156823d33999 117 }
<> 149:156823d33999 118
<> 149:156823d33999 119 /** A shorthand for read()
AnnaBridge 167:e84263d55307 120 * \sa DigitalOut::read()
<> 149:156823d33999 121 */
<> 149:156823d33999 122 operator int() {
<> 149:156823d33999 123 // Underlying call is thread safe
<> 149:156823d33999 124 return read();
<> 149:156823d33999 125 }
<> 149:156823d33999 126
<> 149:156823d33999 127 protected:
<> 149:156823d33999 128 gpio_t gpio;
<> 149:156823d33999 129 };
<> 149:156823d33999 130
<> 149:156823d33999 131 } // namespace mbed
<> 149:156823d33999 132
<> 149:156823d33999 133 #endif