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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

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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.

DigitalOut.h@123:b0220dba8be7, 2016-08-12 (annotated)

Committer:
Kojto
Date:
Fri Aug 12 13:04:35 2016 +0200
Revision:
123:b0220dba8be7
Parent:
122:f9eeca106725 
Release 123 of the mbed library



Changes:

- new targets: nucleo_f207zg, beetle, nrf51_dk, hexiwear,

 nuvoton nuc472, vk rz a1h

- ST - fix timer interrupt handler, sleep api fix

- NXP - lpc15xx us ticker fix

- Nordic - analogin fixes, LF clock init addition, enable i2c async

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 65:5798e58a58b1 1 /* mbed Microcontroller Library
bogdanm 65:5798e58a58b1 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 65:5798e58a58b1 3 *
bogdanm 65:5798e58a58b1 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 65:5798e58a58b1 5 * you may not use this file except in compliance with the License.
bogdanm 65:5798e58a58b1 6 * You may obtain a copy of the License at
bogdanm 65:5798e58a58b1 7 *
bogdanm 65:5798e58a58b1 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 65:5798e58a58b1 9 *
bogdanm 65:5798e58a58b1 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 65:5798e58a58b1 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 65:5798e58a58b1 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 65:5798e58a58b1 13 * See the License for the specific language governing permissions and
bogdanm 65:5798e58a58b1 14 * limitations under the License.
bogdanm 65:5798e58a58b1 15 */
bogdanm 65:5798e58a58b1 16 #ifndef MBED_DIGITALOUT_H
bogdanm 65:5798e58a58b1 17 #define MBED_DIGITALOUT_H
bogdanm 65:5798e58a58b1 18
bogdanm 65:5798e58a58b1 19 #include "platform.h"
bogdanm 65:5798e58a58b1 20 #include "gpio_api.h"
Kojto 122:f9eeca106725 21 #include "critical.h"
bogdanm 65:5798e58a58b1 22
bogdanm 65:5798e58a58b1 23 namespace mbed {
bogdanm 65:5798e58a58b1 24
bogdanm 65:5798e58a58b1 25 /** A digital output, used for setting the state of a pin
bogdanm 65:5798e58a58b1 26 *
Kojto 122:f9eeca106725 27 * @Note Synchronization level: Interrupt safe
Kojto 122:f9eeca106725 28 *
bogdanm 65:5798e58a58b1 29 * Example:
bogdanm 65:5798e58a58b1 30 * @code
bogdanm 65:5798e58a58b1 31 * // Toggle a LED
bogdanm 65:5798e58a58b1 32 * #include "mbed.h"
bogdanm 65:5798e58a58b1 33 *
bogdanm 65:5798e58a58b1 34 * DigitalOut led(LED1);
bogdanm 65:5798e58a58b1 35 *
bogdanm 65:5798e58a58b1 36 * int main() {
bogdanm 65:5798e58a58b1 37 * while(1) {
bogdanm 65:5798e58a58b1 38 * led = !led;
bogdanm 65:5798e58a58b1 39 * wait(0.2);
bogdanm 65:5798e58a58b1 40 * }
bogdanm 65:5798e58a58b1 41 * }
bogdanm 65:5798e58a58b1 42 * @endcode
bogdanm 65:5798e58a58b1 43 */
bogdanm 65:5798e58a58b1 44 class DigitalOut {
bogdanm 65:5798e58a58b1 45
bogdanm 65:5798e58a58b1 46 public:
bogdanm 65:5798e58a58b1 47 /** Create a DigitalOut connected to the specified pin
bogdanm 65:5798e58a58b1 48 *
bogdanm 65:5798e58a58b1 49 * @param pin DigitalOut pin to connect to
bogdanm 65:5798e58a58b1 50 */
bogdanm 85:024bf7f99721 51 DigitalOut(PinName pin) : gpio() {
Kojto 122:f9eeca106725 52 // No lock needed in the constructor
bogdanm 81:7d30d6019079 53 gpio_init_out(&gpio, pin);
bogdanm 81:7d30d6019079 54 }
bogdanm 81:7d30d6019079 55
bogdanm 81:7d30d6019079 56 /** Create a DigitalOut connected to the specified pin
bogdanm 81:7d30d6019079 57 *
bogdanm 81:7d30d6019079 58 * @param pin DigitalOut pin to connect to
bogdanm 81:7d30d6019079 59 * @param value the initial pin value
bogdanm 81:7d30d6019079 60 */
bogdanm 85:024bf7f99721 61 DigitalOut(PinName pin, int value) : gpio() {
Kojto 122:f9eeca106725 62 // No lock needed in the constructor
bogdanm 81:7d30d6019079 63 gpio_init_out_ex(&gpio, pin, value);
bogdanm 65:5798e58a58b1 64 }
bogdanm 65:5798e58a58b1 65
bogdanm 65:5798e58a58b1 66 /** Set the output, specified as 0 or 1 (int)
bogdanm 65:5798e58a58b1 67 *
bogdanm 65:5798e58a58b1 68 * @param value An integer specifying the pin output value,
bogdanm 65:5798e58a58b1 69 * 0 for logical 0, 1 (or any other non-zero value) for logical 1
bogdanm 65:5798e58a58b1 70 */
bogdanm 65:5798e58a58b1 71 void write(int value) {
Kojto 122:f9eeca106725 72 // Thread safe / atomic HAL call
bogdanm 65:5798e58a58b1 73 gpio_write(&gpio, value);
bogdanm 65:5798e58a58b1 74 }
bogdanm 65:5798e58a58b1 75
bogdanm 65:5798e58a58b1 76 /** Return the output setting, represented as 0 or 1 (int)
bogdanm 65:5798e58a58b1 77 *
bogdanm 65:5798e58a58b1 78 * @returns
bogdanm 65:5798e58a58b1 79 * an integer representing the output setting of the pin,
bogdanm 65:5798e58a58b1 80 * 0 for logical 0, 1 for logical 1
bogdanm 65:5798e58a58b1 81 */
bogdanm 65:5798e58a58b1 82 int read() {
Kojto 122:f9eeca106725 83 // Thread safe / atomic HAL call
bogdanm 65:5798e58a58b1 84 return gpio_read(&gpio);
bogdanm 65:5798e58a58b1 85 }
bogdanm 65:5798e58a58b1 86
Kojto 93:e188a91d3eaa 87 /** Return the output setting, represented as 0 or 1 (int)
Kojto 93:e188a91d3eaa 88 *
Kojto 93:e188a91d3eaa 89 * @returns
Kojto 93:e188a91d3eaa 90 * Non zero value if pin is connected to uc GPIO
Kojto 93:e188a91d3eaa 91 * 0 if gpio object was initialized with NC
Kojto 93:e188a91d3eaa 92 */
Kojto 93:e188a91d3eaa 93 int is_connected() {
Kojto 122:f9eeca106725 94 // Thread safe / atomic HAL call
Kojto 93:e188a91d3eaa 95 return gpio_is_connected(&gpio);
Kojto 93:e188a91d3eaa 96 }
Kojto 93:e188a91d3eaa 97
bogdanm 65:5798e58a58b1 98 /** A shorthand for write()
bogdanm 65:5798e58a58b1 99 */
bogdanm 65:5798e58a58b1 100 DigitalOut& operator= (int value) {
Kojto 122:f9eeca106725 101 // Underlying write is thread safe
bogdanm 65:5798e58a58b1 102 write(value);
bogdanm 65:5798e58a58b1 103 return *this;
bogdanm 65:5798e58a58b1 104 }
bogdanm 65:5798e58a58b1 105
bogdanm 65:5798e58a58b1 106 DigitalOut& operator= (DigitalOut& rhs) {
Kojto 122:f9eeca106725 107 core_util_critical_section_enter();
bogdanm 65:5798e58a58b1 108 write(rhs.read());
Kojto 122:f9eeca106725 109 core_util_critical_section_exit();
bogdanm 65:5798e58a58b1 110 return *this;
bogdanm 65:5798e58a58b1 111 }
bogdanm 65:5798e58a58b1 112
bogdanm 65:5798e58a58b1 113 /** A shorthand for read()
bogdanm 65:5798e58a58b1 114 */
bogdanm 65:5798e58a58b1 115 operator int() {
Kojto 122:f9eeca106725 116 // Underlying call is thread safe
bogdanm 65:5798e58a58b1 117 return read();
bogdanm 65:5798e58a58b1 118 }
bogdanm 65:5798e58a58b1 119
bogdanm 65:5798e58a58b1 120 protected:
bogdanm 65:5798e58a58b1 121 gpio_t gpio;
bogdanm 65:5798e58a58b1 122 };
bogdanm 65:5798e58a58b1 123
bogdanm 65:5798e58a58b1 124 } // namespace mbed
bogdanm 65:5798e58a58b1 125
bogdanm 65:5798e58a58b1 126 #endif