FFT LED Display / 4180_EditThis_copy_Demo_Test

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mbed/drivers/DigitalIn.h@0:d6c9b09b4042, 2020-12-02 (annotated)

Committer:
annieluo2
Date:
Wed Dec 02 18:02:03 2020 +0000
Revision:
0:d6c9b09b4042
boo

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annieluo2 0:d6c9b09b4042 1 /* mbed Microcontroller Library
annieluo2 0:d6c9b09b4042 2 * Copyright (c) 2006-2013 ARM Limited
annieluo2 0:d6c9b09b4042 3 *
annieluo2 0:d6c9b09b4042 4 * Licensed under the Apache License, Version 2.0 (the "License");
annieluo2 0:d6c9b09b4042 5 * you may not use this file except in compliance with the License.
annieluo2 0:d6c9b09b4042 6 * You may obtain a copy of the License at
annieluo2 0:d6c9b09b4042 7 *
annieluo2 0:d6c9b09b4042 8 * http://www.apache.org/licenses/LICENSE-2.0
annieluo2 0:d6c9b09b4042 9 *
annieluo2 0:d6c9b09b4042 10 * Unless required by applicable law or agreed to in writing, software
annieluo2 0:d6c9b09b4042 11 * distributed under the License is distributed on an "AS IS" BASIS,
annieluo2 0:d6c9b09b4042 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
annieluo2 0:d6c9b09b4042 13 * See the License for the specific language governing permissions and
annieluo2 0:d6c9b09b4042 14 * limitations under the License.
annieluo2 0:d6c9b09b4042 15 */
annieluo2 0:d6c9b09b4042 16 #ifndef MBED_DIGITALIN_H
annieluo2 0:d6c9b09b4042 17 #define MBED_DIGITALIN_H
annieluo2 0:d6c9b09b4042 18
annieluo2 0:d6c9b09b4042 19 #include "platform/platform.h"
annieluo2 0:d6c9b09b4042 20
annieluo2 0:d6c9b09b4042 21 #include "hal/gpio_api.h"
annieluo2 0:d6c9b09b4042 22 #include "platform/critical.h"
annieluo2 0:d6c9b09b4042 23
annieluo2 0:d6c9b09b4042 24 namespace mbed {
annieluo2 0:d6c9b09b4042 25 /** \addtogroup drivers */
annieluo2 0:d6c9b09b4042 26 /** @{*/
annieluo2 0:d6c9b09b4042 27
annieluo2 0:d6c9b09b4042 28 /** A digital input, used for reading the state of a pin
annieluo2 0:d6c9b09b4042 29 *
annieluo2 0:d6c9b09b4042 30 * @Note Synchronization level: Interrupt safe
annieluo2 0:d6c9b09b4042 31 *
annieluo2 0:d6c9b09b4042 32 * Example:
annieluo2 0:d6c9b09b4042 33 * @code
annieluo2 0:d6c9b09b4042 34 * // Flash an LED while a DigitalIn is true
annieluo2 0:d6c9b09b4042 35 *
annieluo2 0:d6c9b09b4042 36 * #include "mbed.h"
annieluo2 0:d6c9b09b4042 37 *
annieluo2 0:d6c9b09b4042 38 * DigitalIn enable(p5);
annieluo2 0:d6c9b09b4042 39 * DigitalOut led(LED1);
annieluo2 0:d6c9b09b4042 40 *
annieluo2 0:d6c9b09b4042 41 * int main() {
annieluo2 0:d6c9b09b4042 42 * while(1) {
annieluo2 0:d6c9b09b4042 43 * if(enable) {
annieluo2 0:d6c9b09b4042 44 * led = !led;
annieluo2 0:d6c9b09b4042 45 * }
annieluo2 0:d6c9b09b4042 46 * wait(0.25);
annieluo2 0:d6c9b09b4042 47 * }
annieluo2 0:d6c9b09b4042 48 * }
annieluo2 0:d6c9b09b4042 49 * @endcode
annieluo2 0:d6c9b09b4042 50 */
annieluo2 0:d6c9b09b4042 51 class DigitalIn {
annieluo2 0:d6c9b09b4042 52
annieluo2 0:d6c9b09b4042 53 public:
annieluo2 0:d6c9b09b4042 54 /** Create a DigitalIn connected to the specified pin
annieluo2 0:d6c9b09b4042 55 *
annieluo2 0:d6c9b09b4042 56 * @param pin DigitalIn pin to connect to
annieluo2 0:d6c9b09b4042 57 */
annieluo2 0:d6c9b09b4042 58 DigitalIn(PinName pin) : gpio() {
annieluo2 0:d6c9b09b4042 59 // No lock needed in the constructor
annieluo2 0:d6c9b09b4042 60 gpio_init_in(&gpio, pin);
annieluo2 0:d6c9b09b4042 61 }
annieluo2 0:d6c9b09b4042 62
annieluo2 0:d6c9b09b4042 63 /** Create a DigitalIn connected to the specified pin
annieluo2 0:d6c9b09b4042 64 *
annieluo2 0:d6c9b09b4042 65 * @param pin DigitalIn pin to connect to
annieluo2 0:d6c9b09b4042 66 * @param mode the initial mode of the pin
annieluo2 0:d6c9b09b4042 67 */
annieluo2 0:d6c9b09b4042 68 DigitalIn(PinName pin, PinMode mode) : gpio() {
annieluo2 0:d6c9b09b4042 69 // No lock needed in the constructor
annieluo2 0:d6c9b09b4042 70 gpio_init_in_ex(&gpio, pin, mode);
annieluo2 0:d6c9b09b4042 71 }
annieluo2 0:d6c9b09b4042 72 /** Read the input, represented as 0 or 1 (int)
annieluo2 0:d6c9b09b4042 73 *
annieluo2 0:d6c9b09b4042 74 * @returns
annieluo2 0:d6c9b09b4042 75 * An integer representing the state of the input pin,
annieluo2 0:d6c9b09b4042 76 * 0 for logical 0, 1 for logical 1
annieluo2 0:d6c9b09b4042 77 */
annieluo2 0:d6c9b09b4042 78 int read() {
annieluo2 0:d6c9b09b4042 79 // Thread safe / atomic HAL call
annieluo2 0:d6c9b09b4042 80 return gpio_read(&gpio);
annieluo2 0:d6c9b09b4042 81 }
annieluo2 0:d6c9b09b4042 82
annieluo2 0:d6c9b09b4042 83 /** Set the input pin mode
annieluo2 0:d6c9b09b4042 84 *
annieluo2 0:d6c9b09b4042 85 * @param mode PullUp, PullDown, PullNone, OpenDrain
annieluo2 0:d6c9b09b4042 86 */
annieluo2 0:d6c9b09b4042 87 void mode(PinMode pull) {
annieluo2 0:d6c9b09b4042 88 core_util_critical_section_enter();
annieluo2 0:d6c9b09b4042 89 gpio_mode(&gpio, pull);
annieluo2 0:d6c9b09b4042 90 core_util_critical_section_exit();
annieluo2 0:d6c9b09b4042 91 }
annieluo2 0:d6c9b09b4042 92
annieluo2 0:d6c9b09b4042 93 /** Return the output setting, represented as 0 or 1 (int)
annieluo2 0:d6c9b09b4042 94 *
annieluo2 0:d6c9b09b4042 95 * @returns
annieluo2 0:d6c9b09b4042 96 * Non zero value if pin is connected to uc GPIO
annieluo2 0:d6c9b09b4042 97 * 0 if gpio object was initialized with NC
annieluo2 0:d6c9b09b4042 98 */
annieluo2 0:d6c9b09b4042 99 int is_connected() {
annieluo2 0:d6c9b09b4042 100 // Thread safe / atomic HAL call
annieluo2 0:d6c9b09b4042 101 return gpio_is_connected(&gpio);
annieluo2 0:d6c9b09b4042 102 }
annieluo2 0:d6c9b09b4042 103
annieluo2 0:d6c9b09b4042 104 /** An operator shorthand for read()
annieluo2 0:d6c9b09b4042 105 */
annieluo2 0:d6c9b09b4042 106 operator int() {
annieluo2 0:d6c9b09b4042 107 // Underlying read is thread safe
annieluo2 0:d6c9b09b4042 108 return read();
annieluo2 0:d6c9b09b4042 109 }
annieluo2 0:d6c9b09b4042 110
annieluo2 0:d6c9b09b4042 111 protected:
annieluo2 0:d6c9b09b4042 112 gpio_t gpio;
annieluo2 0:d6c9b09b4042 113 };
annieluo2 0:d6c9b09b4042 114
annieluo2 0:d6c9b09b4042 115 } // namespace mbed
annieluo2 0:d6c9b09b4042 116
annieluo2 0:d6c9b09b4042 117 #endif
annieluo2 0:d6c9b09b4042 118
annieluo2 0:d6c9b09b4042 119 /** @}*/