Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/AnalogIn.h@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #ifndef MBED_ANALOGIN_H
<> 144:ef7eb2e8f9f7 17 #define MBED_ANALOGIN_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "platform.h"
<> 144:ef7eb2e8f9f7 20
<> 144:ef7eb2e8f9f7 21 #if DEVICE_ANALOGIN
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 #include "analogin_api.h"
<> 144:ef7eb2e8f9f7 24 #include "SingletonPtr.h"
<> 144:ef7eb2e8f9f7 25 #include "PlatformMutex.h"
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 namespace mbed {
<> 144:ef7eb2e8f9f7 28
<> 144:ef7eb2e8f9f7 29 /** An analog input, used for reading the voltage on a pin
<> 144:ef7eb2e8f9f7 30 *
<> 144:ef7eb2e8f9f7 31 * @Note Synchronization level: Thread safe
<> 144:ef7eb2e8f9f7 32 *
<> 144:ef7eb2e8f9f7 33 * Example:
<> 144:ef7eb2e8f9f7 34 * @code
<> 144:ef7eb2e8f9f7 35 * // Print messages when the AnalogIn is greater than 50%
<> 144:ef7eb2e8f9f7 36 *
<> 144:ef7eb2e8f9f7 37 * #include "mbed.h"
<> 144:ef7eb2e8f9f7 38 *
<> 144:ef7eb2e8f9f7 39 * AnalogIn temperature(p20);
<> 144:ef7eb2e8f9f7 40 *
<> 144:ef7eb2e8f9f7 41 * int main() {
<> 144:ef7eb2e8f9f7 42 * while(1) {
<> 144:ef7eb2e8f9f7 43 * if(temperature > 0.5) {
<> 144:ef7eb2e8f9f7 44 * printf("Too hot! (%f)", temperature.read());
<> 144:ef7eb2e8f9f7 45 * }
<> 144:ef7eb2e8f9f7 46 * }
<> 144:ef7eb2e8f9f7 47 * }
<> 144:ef7eb2e8f9f7 48 * @endcode
<> 144:ef7eb2e8f9f7 49 */
<> 144:ef7eb2e8f9f7 50 class AnalogIn {
<> 144:ef7eb2e8f9f7 51
<> 144:ef7eb2e8f9f7 52 public:
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 /** Create an AnalogIn, connected to the specified pin
<> 144:ef7eb2e8f9f7 55 *
<> 144:ef7eb2e8f9f7 56 * @param pin AnalogIn pin to connect to
<> 144:ef7eb2e8f9f7 57 * @param name (optional) A string to identify the object
<> 144:ef7eb2e8f9f7 58 */
<> 144:ef7eb2e8f9f7 59 AnalogIn(PinName pin) {
<> 144:ef7eb2e8f9f7 60 lock();
<> 144:ef7eb2e8f9f7 61 analogin_init(&_adc, pin);
<> 144:ef7eb2e8f9f7 62 unlock();
<> 144:ef7eb2e8f9f7 63 }
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 /** Read the input voltage, represented as a float in the range [0.0, 1.0]
<> 144:ef7eb2e8f9f7 66 *
<> 144:ef7eb2e8f9f7 67 * @returns A floating-point value representing the current input voltage, measured as a percentage
<> 144:ef7eb2e8f9f7 68 */
<> 144:ef7eb2e8f9f7 69 float read() {
<> 144:ef7eb2e8f9f7 70 lock();
<> 144:ef7eb2e8f9f7 71 float ret = analogin_read(&_adc);
<> 144:ef7eb2e8f9f7 72 unlock();
<> 144:ef7eb2e8f9f7 73 return ret;
<> 144:ef7eb2e8f9f7 74 }
<> 144:ef7eb2e8f9f7 75
<> 144:ef7eb2e8f9f7 76 /** Read the input voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
<> 144:ef7eb2e8f9f7 77 *
<> 144:ef7eb2e8f9f7 78 * @returns
<> 144:ef7eb2e8f9f7 79 * 16-bit unsigned short representing the current input voltage, normalised to a 16-bit value
<> 144:ef7eb2e8f9f7 80 */
<> 144:ef7eb2e8f9f7 81 unsigned short read_u16() {
<> 144:ef7eb2e8f9f7 82 lock();
<> 144:ef7eb2e8f9f7 83 unsigned short ret = analogin_read_u16(&_adc);
<> 144:ef7eb2e8f9f7 84 unlock();
<> 144:ef7eb2e8f9f7 85 return ret;
<> 144:ef7eb2e8f9f7 86 }
<> 144:ef7eb2e8f9f7 87
<> 144:ef7eb2e8f9f7 88 /** An operator shorthand for read()
<> 144:ef7eb2e8f9f7 89 *
<> 144:ef7eb2e8f9f7 90 * The float() operator can be used as a shorthand for read() to simplify common code sequences
<> 144:ef7eb2e8f9f7 91 *
<> 144:ef7eb2e8f9f7 92 * Example:
<> 144:ef7eb2e8f9f7 93 * @code
<> 144:ef7eb2e8f9f7 94 * float x = volume.read();
<> 144:ef7eb2e8f9f7 95 * float x = volume;
<> 144:ef7eb2e8f9f7 96 *
<> 144:ef7eb2e8f9f7 97 * if(volume.read() > 0.25) { ... }
<> 144:ef7eb2e8f9f7 98 * if(volume > 0.25) { ... }
<> 144:ef7eb2e8f9f7 99 * @endcode
<> 144:ef7eb2e8f9f7 100 */
<> 144:ef7eb2e8f9f7 101 operator float() {
<> 144:ef7eb2e8f9f7 102 // Underlying call is thread safe
<> 144:ef7eb2e8f9f7 103 return read();
<> 144:ef7eb2e8f9f7 104 }
<> 144:ef7eb2e8f9f7 105
<> 144:ef7eb2e8f9f7 106 virtual ~AnalogIn() {
<> 144:ef7eb2e8f9f7 107 // Do nothing
<> 144:ef7eb2e8f9f7 108 }
<> 144:ef7eb2e8f9f7 109
<> 144:ef7eb2e8f9f7 110 protected:
<> 144:ef7eb2e8f9f7 111
<> 144:ef7eb2e8f9f7 112 virtual void lock() {
<> 144:ef7eb2e8f9f7 113 _mutex->lock();
<> 144:ef7eb2e8f9f7 114 }
<> 144:ef7eb2e8f9f7 115
<> 144:ef7eb2e8f9f7 116 virtual void unlock() {
<> 144:ef7eb2e8f9f7 117 _mutex->unlock();
<> 144:ef7eb2e8f9f7 118 }
<> 144:ef7eb2e8f9f7 119
<> 144:ef7eb2e8f9f7 120 analogin_t _adc;
<> 144:ef7eb2e8f9f7 121 static SingletonPtr<PlatformMutex> _mutex;
<> 144:ef7eb2e8f9f7 122 };
<> 144:ef7eb2e8f9f7 123
<> 144:ef7eb2e8f9f7 124 } // namespace mbed
<> 144:ef7eb2e8f9f7 125
<> 144:ef7eb2e8f9f7 126 #endif
<> 144:ef7eb2e8f9f7 127
<> 144:ef7eb2e8f9f7 128 #endif