Gan likun / mbed-dev11

1232

drivers/DigitalIn.h@0:06036f8bee2d, 23 months ago (annotated)

Committer:
ganlikun
Date:
Mon Oct 24 15:19:39 2022 +0000
Revision:
0:06036f8bee2d
11

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ganlikun 0:06036f8bee2d 1 /* mbed Microcontroller Library
ganlikun 0:06036f8bee2d 2 * Copyright (c) 2006-2013 ARM Limited
ganlikun 0:06036f8bee2d 3 *
ganlikun 0:06036f8bee2d 4 * Licensed under the Apache License, Version 2.0 (the "License");
ganlikun 0:06036f8bee2d 5 * you may not use this file except in compliance with the License.
ganlikun 0:06036f8bee2d 6 * You may obtain a copy of the License at
ganlikun 0:06036f8bee2d 7 *
ganlikun 0:06036f8bee2d 8 * http://www.apache.org/licenses/LICENSE-2.0
ganlikun 0:06036f8bee2d 9 *
ganlikun 0:06036f8bee2d 10 * Unless required by applicable law or agreed to in writing, software
ganlikun 0:06036f8bee2d 11 * distributed under the License is distributed on an "AS IS" BASIS,
ganlikun 0:06036f8bee2d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ganlikun 0:06036f8bee2d 13 * See the License for the specific language governing permissions and
ganlikun 0:06036f8bee2d 14 * limitations under the License.
ganlikun 0:06036f8bee2d 15 */
ganlikun 0:06036f8bee2d 16 #ifndef MBED_DIGITALIN_H
ganlikun 0:06036f8bee2d 17 #define MBED_DIGITALIN_H
ganlikun 0:06036f8bee2d 18
ganlikun 0:06036f8bee2d 19 #include "platform/platform.h"
ganlikun 0:06036f8bee2d 20
ganlikun 0:06036f8bee2d 21 #include "hal/gpio_api.h"
ganlikun 0:06036f8bee2d 22 #include "platform/mbed_critical.h"
ganlikun 0:06036f8bee2d 23
ganlikun 0:06036f8bee2d 24 namespace mbed {
ganlikun 0:06036f8bee2d 25 /** \addtogroup drivers */
ganlikun 0:06036f8bee2d 26
ganlikun 0:06036f8bee2d 27 /** A digital input, used for reading the state of a pin
ganlikun 0:06036f8bee2d 28 *
ganlikun 0:06036f8bee2d 29 * @note Synchronization level: Interrupt safe
ganlikun 0:06036f8bee2d 30 *
ganlikun 0:06036f8bee2d 31 * Example:
ganlikun 0:06036f8bee2d 32 * @code
ganlikun 0:06036f8bee2d 33 * // Flash an LED while a DigitalIn is true
ganlikun 0:06036f8bee2d 34 *
ganlikun 0:06036f8bee2d 35 * #include "mbed.h"
ganlikun 0:06036f8bee2d 36 *
ganlikun 0:06036f8bee2d 37 * DigitalIn enable(p5);
ganlikun 0:06036f8bee2d 38 * DigitalOut led(LED1);
ganlikun 0:06036f8bee2d 39 *
ganlikun 0:06036f8bee2d 40 * int main() {
ganlikun 0:06036f8bee2d 41 * while(1) {
ganlikun 0:06036f8bee2d 42 * if(enable) {
ganlikun 0:06036f8bee2d 43 * led = !led;
ganlikun 0:06036f8bee2d 44 * }
ganlikun 0:06036f8bee2d 45 * wait(0.25);
ganlikun 0:06036f8bee2d 46 * }
ganlikun 0:06036f8bee2d 47 * }
ganlikun 0:06036f8bee2d 48 * @endcode
ganlikun 0:06036f8bee2d 49 * @ingroup drivers
ganlikun 0:06036f8bee2d 50 */
ganlikun 0:06036f8bee2d 51 class DigitalIn {
ganlikun 0:06036f8bee2d 52
ganlikun 0:06036f8bee2d 53 public:
ganlikun 0:06036f8bee2d 54 /** Create a DigitalIn connected to the specified pin
ganlikun 0:06036f8bee2d 55 *
ganlikun 0:06036f8bee2d 56 * @param pin DigitalIn pin to connect to
ganlikun 0:06036f8bee2d 57 */
ganlikun 0:06036f8bee2d 58 DigitalIn(PinName pin) : gpio() {
ganlikun 0:06036f8bee2d 59 // No lock needed in the constructor
ganlikun 0:06036f8bee2d 60 gpio_init_in(&gpio, pin);
ganlikun 0:06036f8bee2d 61 }
ganlikun 0:06036f8bee2d 62
ganlikun 0:06036f8bee2d 63 /** Create a DigitalIn connected to the specified pin
ganlikun 0:06036f8bee2d 64 *
ganlikun 0:06036f8bee2d 65 * @param pin DigitalIn pin to connect to
ganlikun 0:06036f8bee2d 66 * @param mode the initial mode of the pin
ganlikun 0:06036f8bee2d 67 */
ganlikun 0:06036f8bee2d 68 DigitalIn(PinName pin, PinMode mode) : gpio() {
ganlikun 0:06036f8bee2d 69 // No lock needed in the constructor
ganlikun 0:06036f8bee2d 70 gpio_init_in_ex(&gpio, pin, mode);
ganlikun 0:06036f8bee2d 71 }
ganlikun 0:06036f8bee2d 72 /** Read the input, represented as 0 or 1 (int)
ganlikun 0:06036f8bee2d 73 *
ganlikun 0:06036f8bee2d 74 * @returns
ganlikun 0:06036f8bee2d 75 * An integer representing the state of the input pin,
ganlikun 0:06036f8bee2d 76 * 0 for logical 0, 1 for logical 1
ganlikun 0:06036f8bee2d 77 */
ganlikun 0:06036f8bee2d 78 int read() {
ganlikun 0:06036f8bee2d 79 // Thread safe / atomic HAL call
ganlikun 0:06036f8bee2d 80 return gpio_read(&gpio);
ganlikun 0:06036f8bee2d 81 }
ganlikun 0:06036f8bee2d 82
ganlikun 0:06036f8bee2d 83 /** Set the input pin mode
ganlikun 0:06036f8bee2d 84 *
ganlikun 0:06036f8bee2d 85 * @param pull PullUp, PullDown, PullNone, OpenDrain
ganlikun 0:06036f8bee2d 86 */
ganlikun 0:06036f8bee2d 87 void mode(PinMode pull) {
ganlikun 0:06036f8bee2d 88 core_util_critical_section_enter();
ganlikun 0:06036f8bee2d 89 gpio_mode(&gpio, pull);
ganlikun 0:06036f8bee2d 90 core_util_critical_section_exit();
ganlikun 0:06036f8bee2d 91 }
ganlikun 0:06036f8bee2d 92
ganlikun 0:06036f8bee2d 93 /** Return the output setting, represented as 0 or 1 (int)
ganlikun 0:06036f8bee2d 94 *
ganlikun 0:06036f8bee2d 95 * @returns
ganlikun 0:06036f8bee2d 96 * Non zero value if pin is connected to uc GPIO
ganlikun 0:06036f8bee2d 97 * 0 if gpio object was initialized with NC
ganlikun 0:06036f8bee2d 98 */
ganlikun 0:06036f8bee2d 99 int is_connected() {
ganlikun 0:06036f8bee2d 100 // Thread safe / atomic HAL call
ganlikun 0:06036f8bee2d 101 return gpio_is_connected(&gpio);
ganlikun 0:06036f8bee2d 102 }
ganlikun 0:06036f8bee2d 103
ganlikun 0:06036f8bee2d 104 /** An operator shorthand for read()
ganlikun 0:06036f8bee2d 105 * \sa DigitalIn::read()
ganlikun 0:06036f8bee2d 106 */
ganlikun 0:06036f8bee2d 107 operator int() {
ganlikun 0:06036f8bee2d 108 // Underlying read is thread safe
ganlikun 0:06036f8bee2d 109 return read();
ganlikun 0:06036f8bee2d 110 }
ganlikun 0:06036f8bee2d 111
ganlikun 0:06036f8bee2d 112 protected:
ganlikun 0:06036f8bee2d 113 gpio_t gpio;
ganlikun 0:06036f8bee2d 114 };
ganlikun 0:06036f8bee2d 115
ganlikun 0:06036f8bee2d 116 } // namespace mbed
ganlikun 0:06036f8bee2d 117
ganlikun 0:06036f8bee2d 118 #endif
ganlikun 0:06036f8bee2d 119