Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/Ticker.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_TICKER_H
<> 144:ef7eb2e8f9f7 17 #define MBED_TICKER_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "TimerEvent.h"
<> 144:ef7eb2e8f9f7 20 #include "Callback.h"
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 namespace mbed {
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 /** A Ticker is used to call a function at a recurring interval
<> 144:ef7eb2e8f9f7 25 *
<> 144:ef7eb2e8f9f7 26 * You can use as many seperate Ticker objects as you require.
<> 144:ef7eb2e8f9f7 27 *
<> 144:ef7eb2e8f9f7 28 * @Note Synchronization level: Interrupt safe
<> 144:ef7eb2e8f9f7 29 *
<> 144:ef7eb2e8f9f7 30 * Example:
<> 144:ef7eb2e8f9f7 31 * @code
<> 144:ef7eb2e8f9f7 32 * // Toggle the blinking led after 5 seconds
<> 144:ef7eb2e8f9f7 33 *
<> 144:ef7eb2e8f9f7 34 * #include "mbed.h"
<> 144:ef7eb2e8f9f7 35 *
<> 144:ef7eb2e8f9f7 36 * Ticker timer;
<> 144:ef7eb2e8f9f7 37 * DigitalOut led1(LED1);
<> 144:ef7eb2e8f9f7 38 * DigitalOut led2(LED2);
<> 144:ef7eb2e8f9f7 39 *
<> 144:ef7eb2e8f9f7 40 * int flip = 0;
<> 144:ef7eb2e8f9f7 41 *
<> 144:ef7eb2e8f9f7 42 * void attime() {
<> 144:ef7eb2e8f9f7 43 * flip = !flip;
<> 144:ef7eb2e8f9f7 44 * }
<> 144:ef7eb2e8f9f7 45 *
<> 144:ef7eb2e8f9f7 46 * int main() {
<> 144:ef7eb2e8f9f7 47 * timer.attach(&attime, 5);
<> 144:ef7eb2e8f9f7 48 * while(1) {
<> 144:ef7eb2e8f9f7 49 * if(flip == 0) {
<> 144:ef7eb2e8f9f7 50 * led1 = !led1;
<> 144:ef7eb2e8f9f7 51 * } else {
<> 144:ef7eb2e8f9f7 52 * led2 = !led2;
<> 144:ef7eb2e8f9f7 53 * }
<> 144:ef7eb2e8f9f7 54 * wait(0.2);
<> 144:ef7eb2e8f9f7 55 * }
<> 144:ef7eb2e8f9f7 56 * }
<> 144:ef7eb2e8f9f7 57 * @endcode
<> 144:ef7eb2e8f9f7 58 */
<> 144:ef7eb2e8f9f7 59 class Ticker : public TimerEvent {
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 public:
<> 144:ef7eb2e8f9f7 62 Ticker() : TimerEvent() {
<> 144:ef7eb2e8f9f7 63 }
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 Ticker(const ticker_data_t *data) : TimerEvent(data) {
<> 144:ef7eb2e8f9f7 66 data->interface->init();
<> 144:ef7eb2e8f9f7 67 }
<> 144:ef7eb2e8f9f7 68
<> 144:ef7eb2e8f9f7 69 /** Attach a function to be called by the Ticker, specifiying the interval in seconds
<> 144:ef7eb2e8f9f7 70 *
<> 144:ef7eb2e8f9f7 71 * @param func pointer to the function to be called
<> 144:ef7eb2e8f9f7 72 * @param t the time between calls in seconds
<> 144:ef7eb2e8f9f7 73 */
<> 144:ef7eb2e8f9f7 74 void attach(Callback<void()> func, float t) {
<> 144:ef7eb2e8f9f7 75 attach_us(func, t * 1000000.0f);
<> 144:ef7eb2e8f9f7 76 }
<> 144:ef7eb2e8f9f7 77
<> 144:ef7eb2e8f9f7 78 /** Attach a member function to be called by the Ticker, specifiying the interval in seconds
<> 144:ef7eb2e8f9f7 79 *
<> 144:ef7eb2e8f9f7 80 * @param obj pointer to the object to call the member function on
<> 144:ef7eb2e8f9f7 81 * @param method pointer to the member function to be called
<> 144:ef7eb2e8f9f7 82 * @param t the time between calls in seconds
<> 144:ef7eb2e8f9f7 83 */
<> 144:ef7eb2e8f9f7 84 template<typename T, typename M>
<> 144:ef7eb2e8f9f7 85 void attach(T *obj, M method, float t) {
<> 144:ef7eb2e8f9f7 86 attach(Callback<void()>(obj, method), t);
<> 144:ef7eb2e8f9f7 87 }
<> 144:ef7eb2e8f9f7 88
<> 144:ef7eb2e8f9f7 89 /** Attach a function to be called by the Ticker, specifiying the interval in micro-seconds
<> 144:ef7eb2e8f9f7 90 *
<> 144:ef7eb2e8f9f7 91 * @param fptr pointer to the function to be called
<> 144:ef7eb2e8f9f7 92 * @param t the time between calls in micro-seconds
<> 144:ef7eb2e8f9f7 93 */
<> 144:ef7eb2e8f9f7 94 void attach_us(Callback<void()> func, timestamp_t t) {
<> 144:ef7eb2e8f9f7 95 _function.attach(func);
<> 144:ef7eb2e8f9f7 96 setup(t);
<> 144:ef7eb2e8f9f7 97 }
<> 144:ef7eb2e8f9f7 98
<> 144:ef7eb2e8f9f7 99 /** Attach a member function to be called by the Ticker, specifiying the interval in micro-seconds
<> 144:ef7eb2e8f9f7 100 *
<> 144:ef7eb2e8f9f7 101 * @param tptr pointer to the object to call the member function on
<> 144:ef7eb2e8f9f7 102 * @param mptr pointer to the member function to be called
<> 144:ef7eb2e8f9f7 103 * @param t the time between calls in micro-seconds
<> 144:ef7eb2e8f9f7 104 */
<> 144:ef7eb2e8f9f7 105 template<typename T, typename M>
<> 144:ef7eb2e8f9f7 106 void attach_us(T *obj, M method, timestamp_t t) {
<> 144:ef7eb2e8f9f7 107 attach_us(Callback<void()>(obj, method), t);
<> 144:ef7eb2e8f9f7 108 }
<> 144:ef7eb2e8f9f7 109
<> 144:ef7eb2e8f9f7 110 virtual ~Ticker() {
<> 144:ef7eb2e8f9f7 111 detach();
<> 144:ef7eb2e8f9f7 112 }
<> 144:ef7eb2e8f9f7 113
<> 144:ef7eb2e8f9f7 114 /** Detach the function
<> 144:ef7eb2e8f9f7 115 */
<> 144:ef7eb2e8f9f7 116 void detach();
<> 144:ef7eb2e8f9f7 117
<> 144:ef7eb2e8f9f7 118 protected:
<> 144:ef7eb2e8f9f7 119 void setup(timestamp_t t);
<> 144:ef7eb2e8f9f7 120 virtual void handler();
<> 144:ef7eb2e8f9f7 121
<> 144:ef7eb2e8f9f7 122 protected:
<> 144:ef7eb2e8f9f7 123 timestamp_t _delay; /**< Time delay (in microseconds) for re-setting the multi-shot callback. */
<> 144:ef7eb2e8f9f7 124 Callback<void()> _function; /**< Callback. */
<> 144:ef7eb2e8f9f7 125 };
<> 144:ef7eb2e8f9f7 126
<> 144:ef7eb2e8f9f7 127 } // namespace mbed
<> 144:ef7eb2e8f9f7 128
<> 144:ef7eb2e8f9f7 129 #endif