FFT LED Display / 4180_EditThis_copy_Demo_Test

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mbed/drivers/AnalogIn.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_ANALOGIN_H
annieluo2 0:d6c9b09b4042 17 #define MBED_ANALOGIN_H
annieluo2 0:d6c9b09b4042 18
annieluo2 0:d6c9b09b4042 19 #include "platform/platform.h"
annieluo2 0:d6c9b09b4042 20
annieluo2 0:d6c9b09b4042 21 #if DEVICE_ANALOGIN
annieluo2 0:d6c9b09b4042 22
annieluo2 0:d6c9b09b4042 23 #include "hal/analogin_api.h"
annieluo2 0:d6c9b09b4042 24 #include "platform/SingletonPtr.h"
annieluo2 0:d6c9b09b4042 25 #include "platform/PlatformMutex.h"
annieluo2 0:d6c9b09b4042 26
annieluo2 0:d6c9b09b4042 27 namespace mbed {
annieluo2 0:d6c9b09b4042 28 /** \addtogroup drivers */
annieluo2 0:d6c9b09b4042 29 /** @{*/
annieluo2 0:d6c9b09b4042 30
annieluo2 0:d6c9b09b4042 31 /** An analog input, used for reading the voltage on a pin
annieluo2 0:d6c9b09b4042 32 *
annieluo2 0:d6c9b09b4042 33 * @Note Synchronization level: Thread safe
annieluo2 0:d6c9b09b4042 34 *
annieluo2 0:d6c9b09b4042 35 * Example:
annieluo2 0:d6c9b09b4042 36 * @code
annieluo2 0:d6c9b09b4042 37 * // Print messages when the AnalogIn is greater than 50%
annieluo2 0:d6c9b09b4042 38 *
annieluo2 0:d6c9b09b4042 39 * #include "mbed.h"
annieluo2 0:d6c9b09b4042 40 *
annieluo2 0:d6c9b09b4042 41 * AnalogIn temperature(p20);
annieluo2 0:d6c9b09b4042 42 *
annieluo2 0:d6c9b09b4042 43 * int main() {
annieluo2 0:d6c9b09b4042 44 * while(1) {
annieluo2 0:d6c9b09b4042 45 * if(temperature > 0.5) {
annieluo2 0:d6c9b09b4042 46 * printf("Too hot! (%f)", temperature.read());
annieluo2 0:d6c9b09b4042 47 * }
annieluo2 0:d6c9b09b4042 48 * }
annieluo2 0:d6c9b09b4042 49 * }
annieluo2 0:d6c9b09b4042 50 * @endcode
annieluo2 0:d6c9b09b4042 51 */
annieluo2 0:d6c9b09b4042 52 class AnalogIn {
annieluo2 0:d6c9b09b4042 53
annieluo2 0:d6c9b09b4042 54 public:
annieluo2 0:d6c9b09b4042 55
annieluo2 0:d6c9b09b4042 56 /** Create an AnalogIn, connected to the specified pin
annieluo2 0:d6c9b09b4042 57 *
annieluo2 0:d6c9b09b4042 58 * @param pin AnalogIn pin to connect to
annieluo2 0:d6c9b09b4042 59 * @param name (optional) A string to identify the object
annieluo2 0:d6c9b09b4042 60 */
annieluo2 0:d6c9b09b4042 61 AnalogIn(PinName pin) {
annieluo2 0:d6c9b09b4042 62 lock();
annieluo2 0:d6c9b09b4042 63 analogin_init(&_adc, pin);
annieluo2 0:d6c9b09b4042 64 unlock();
annieluo2 0:d6c9b09b4042 65 }
annieluo2 0:d6c9b09b4042 66
annieluo2 0:d6c9b09b4042 67 /** Read the input voltage, represented as a float in the range [0.0, 1.0]
annieluo2 0:d6c9b09b4042 68 *
annieluo2 0:d6c9b09b4042 69 * @returns A floating-point value representing the current input voltage, measured as a percentage
annieluo2 0:d6c9b09b4042 70 */
annieluo2 0:d6c9b09b4042 71 float read() {
annieluo2 0:d6c9b09b4042 72 lock();
annieluo2 0:d6c9b09b4042 73 float ret = analogin_read(&_adc);
annieluo2 0:d6c9b09b4042 74 unlock();
annieluo2 0:d6c9b09b4042 75 return ret;
annieluo2 0:d6c9b09b4042 76 }
annieluo2 0:d6c9b09b4042 77
annieluo2 0:d6c9b09b4042 78 /** Read the input voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
annieluo2 0:d6c9b09b4042 79 *
annieluo2 0:d6c9b09b4042 80 * @returns
annieluo2 0:d6c9b09b4042 81 * 16-bit unsigned short representing the current input voltage, normalised to a 16-bit value
annieluo2 0:d6c9b09b4042 82 */
annieluo2 0:d6c9b09b4042 83 unsigned short read_u16() {
annieluo2 0:d6c9b09b4042 84 lock();
annieluo2 0:d6c9b09b4042 85 unsigned short ret = analogin_read_u16(&_adc);
annieluo2 0:d6c9b09b4042 86 unlock();
annieluo2 0:d6c9b09b4042 87 return ret;
annieluo2 0:d6c9b09b4042 88 }
annieluo2 0:d6c9b09b4042 89
annieluo2 0:d6c9b09b4042 90 /** An operator shorthand for read()
annieluo2 0:d6c9b09b4042 91 *
annieluo2 0:d6c9b09b4042 92 * The float() operator can be used as a shorthand for read() to simplify common code sequences
annieluo2 0:d6c9b09b4042 93 *
annieluo2 0:d6c9b09b4042 94 * Example:
annieluo2 0:d6c9b09b4042 95 * @code
annieluo2 0:d6c9b09b4042 96 * float x = volume.read();
annieluo2 0:d6c9b09b4042 97 * float x = volume;
annieluo2 0:d6c9b09b4042 98 *
annieluo2 0:d6c9b09b4042 99 * if(volume.read() > 0.25) { ... }
annieluo2 0:d6c9b09b4042 100 * if(volume > 0.25) { ... }
annieluo2 0:d6c9b09b4042 101 * @endcode
annieluo2 0:d6c9b09b4042 102 */
annieluo2 0:d6c9b09b4042 103 operator float() {
annieluo2 0:d6c9b09b4042 104 // Underlying call is thread safe
annieluo2 0:d6c9b09b4042 105 return read();
annieluo2 0:d6c9b09b4042 106 }
annieluo2 0:d6c9b09b4042 107
annieluo2 0:d6c9b09b4042 108 virtual ~AnalogIn() {
annieluo2 0:d6c9b09b4042 109 // Do nothing
annieluo2 0:d6c9b09b4042 110 }
annieluo2 0:d6c9b09b4042 111
annieluo2 0:d6c9b09b4042 112 protected:
annieluo2 0:d6c9b09b4042 113
annieluo2 0:d6c9b09b4042 114 virtual void lock() {
annieluo2 0:d6c9b09b4042 115 _mutex->lock();
annieluo2 0:d6c9b09b4042 116 }
annieluo2 0:d6c9b09b4042 117
annieluo2 0:d6c9b09b4042 118 virtual void unlock() {
annieluo2 0:d6c9b09b4042 119 _mutex->unlock();
annieluo2 0:d6c9b09b4042 120 }
annieluo2 0:d6c9b09b4042 121
annieluo2 0:d6c9b09b4042 122 analogin_t _adc;
annieluo2 0:d6c9b09b4042 123 static SingletonPtr<PlatformMutex> _mutex;
annieluo2 0:d6c9b09b4042 124 };
annieluo2 0:d6c9b09b4042 125
annieluo2 0:d6c9b09b4042 126 } // namespace mbed
annieluo2 0:d6c9b09b4042 127
annieluo2 0:d6c9b09b4042 128 #endif
annieluo2 0:d6c9b09b4042 129
annieluo2 0:d6c9b09b4042 130 #endif
annieluo2 0:d6c9b09b4042 131
annieluo2 0:d6c9b09b4042 132 /** @}*/