Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/Timer.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_TIMER_H
<> 144:ef7eb2e8f9f7 17 #define MBED_TIMER_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "platform.h"
<> 144:ef7eb2e8f9f7 20 #include "ticker_api.h"
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 namespace mbed {
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 /** A general purpose timer
<> 144:ef7eb2e8f9f7 25 *
<> 144:ef7eb2e8f9f7 26 * @Note Synchronization level: Interrupt safe
<> 144:ef7eb2e8f9f7 27 *
<> 144:ef7eb2e8f9f7 28 * Example:
<> 144:ef7eb2e8f9f7 29 * @code
<> 144:ef7eb2e8f9f7 30 * // Count the time to toggle a LED
<> 144:ef7eb2e8f9f7 31 *
<> 144:ef7eb2e8f9f7 32 * #include "mbed.h"
<> 144:ef7eb2e8f9f7 33 *
<> 144:ef7eb2e8f9f7 34 * Timer timer;
<> 144:ef7eb2e8f9f7 35 * DigitalOut led(LED1);
<> 144:ef7eb2e8f9f7 36 * int begin, end;
<> 144:ef7eb2e8f9f7 37 *
<> 144:ef7eb2e8f9f7 38 * int main() {
<> 144:ef7eb2e8f9f7 39 * timer.start();
<> 144:ef7eb2e8f9f7 40 * begin = timer.read_us();
<> 144:ef7eb2e8f9f7 41 * led = !led;
<> 144:ef7eb2e8f9f7 42 * end = timer.read_us();
<> 144:ef7eb2e8f9f7 43 * printf("Toggle the led takes %d us", end - begin);
<> 144:ef7eb2e8f9f7 44 * }
<> 144:ef7eb2e8f9f7 45 * @endcode
<> 144:ef7eb2e8f9f7 46 */
<> 144:ef7eb2e8f9f7 47 class Timer {
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 public:
<> 144:ef7eb2e8f9f7 50 Timer();
<> 144:ef7eb2e8f9f7 51 Timer(const ticker_data_t *data);
<> 144:ef7eb2e8f9f7 52
<> 144:ef7eb2e8f9f7 53 /** Start the timer
<> 144:ef7eb2e8f9f7 54 */
<> 144:ef7eb2e8f9f7 55 void start();
<> 144:ef7eb2e8f9f7 56
<> 144:ef7eb2e8f9f7 57 /** Stop the timer
<> 144:ef7eb2e8f9f7 58 */
<> 144:ef7eb2e8f9f7 59 void stop();
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 /** Reset the timer to 0.
<> 144:ef7eb2e8f9f7 62 *
<> 144:ef7eb2e8f9f7 63 * If it was already counting, it will continue
<> 144:ef7eb2e8f9f7 64 */
<> 144:ef7eb2e8f9f7 65 void reset();
<> 144:ef7eb2e8f9f7 66
<> 144:ef7eb2e8f9f7 67 /** Get the time passed in seconds
<> 144:ef7eb2e8f9f7 68 */
<> 144:ef7eb2e8f9f7 69 float read();
<> 144:ef7eb2e8f9f7 70
<> 144:ef7eb2e8f9f7 71 /** Get the time passed in mili-seconds
<> 144:ef7eb2e8f9f7 72 */
<> 144:ef7eb2e8f9f7 73 int read_ms();
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 /** Get the time passed in micro-seconds
<> 144:ef7eb2e8f9f7 76 */
<> 144:ef7eb2e8f9f7 77 int read_us();
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 /** An operator shorthand for read()
<> 144:ef7eb2e8f9f7 80 */
<> 144:ef7eb2e8f9f7 81 operator float();
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 protected:
<> 144:ef7eb2e8f9f7 84 int slicetime();
<> 144:ef7eb2e8f9f7 85 int _running; // whether the timer is running
<> 144:ef7eb2e8f9f7 86 unsigned int _start; // the start time of the latest slice
<> 144:ef7eb2e8f9f7 87 int _time; // any accumulated time from previous slices
<> 144:ef7eb2e8f9f7 88 const ticker_data_t *_ticker_data;
<> 144:ef7eb2e8f9f7 89 };
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 } // namespace mbed
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 #endif