Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/BusIn.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_BUSIN_H
<> 144:ef7eb2e8f9f7 17 #define MBED_BUSIN_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "platform.h"
<> 144:ef7eb2e8f9f7 20 #include "DigitalIn.h"
<> 144:ef7eb2e8f9f7 21 #include "PlatformMutex.h"
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 namespace mbed {
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 /** A digital input bus, used for reading the state of a collection of pins
<> 144:ef7eb2e8f9f7 26 *
<> 144:ef7eb2e8f9f7 27 * @Note Synchronization level: Thread safe
<> 144:ef7eb2e8f9f7 28 */
<> 144:ef7eb2e8f9f7 29 class BusIn {
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 public:
<> 144:ef7eb2e8f9f7 32 /* Group: Configuration Methods */
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 /** Create an BusIn, connected to the specified pins
<> 144:ef7eb2e8f9f7 35 *
<> 144:ef7eb2e8f9f7 36 * @param <n> DigitalIn pin to connect to bus bit <n> (p5-p30, NC)
<> 144:ef7eb2e8f9f7 37 *
<> 144:ef7eb2e8f9f7 38 * @note
<> 144:ef7eb2e8f9f7 39 * It is only required to specify as many pin variables as is required
<> 144:ef7eb2e8f9f7 40 * for the bus; the rest will default to NC (not connected)
<> 144:ef7eb2e8f9f7 41 */
<> 144:ef7eb2e8f9f7 42 BusIn(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
<> 144:ef7eb2e8f9f7 43 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
<> 144:ef7eb2e8f9f7 44 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
<> 144:ef7eb2e8f9f7 45 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 BusIn(PinName pins[16]);
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 virtual ~BusIn();
<> 144:ef7eb2e8f9f7 50
<> 144:ef7eb2e8f9f7 51 /** Read the value of the input bus
<> 144:ef7eb2e8f9f7 52 *
<> 144:ef7eb2e8f9f7 53 * @returns
<> 144:ef7eb2e8f9f7 54 * An integer with each bit corresponding to the value read from the associated DigitalIn pin
<> 144:ef7eb2e8f9f7 55 */
<> 144:ef7eb2e8f9f7 56 int read();
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 /** Set the input pin mode
<> 144:ef7eb2e8f9f7 59 *
<> 144:ef7eb2e8f9f7 60 * @param mode PullUp, PullDown, PullNone
<> 144:ef7eb2e8f9f7 61 */
<> 144:ef7eb2e8f9f7 62 void mode(PinMode pull);
<> 144:ef7eb2e8f9f7 63
<> 144:ef7eb2e8f9f7 64 /** Binary mask of bus pins connected to actual pins (not NC pins)
<> 144:ef7eb2e8f9f7 65 * If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
<> 144:ef7eb2e8f9f7 66 *
<> 144:ef7eb2e8f9f7 67 * @returns
<> 144:ef7eb2e8f9f7 68 * Binary mask of connected pins
<> 144:ef7eb2e8f9f7 69 */
<> 144:ef7eb2e8f9f7 70 int mask() {
<> 144:ef7eb2e8f9f7 71 // No lock needed since _nc_mask is not modified outside the constructor
<> 144:ef7eb2e8f9f7 72 return _nc_mask;
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 /** A shorthand for read()
<> 144:ef7eb2e8f9f7 76 */
<> 144:ef7eb2e8f9f7 77 operator int();
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 /** Access to particular bit in random-iterator fashion
<> 144:ef7eb2e8f9f7 80 */
<> 144:ef7eb2e8f9f7 81 DigitalIn & operator[] (int index);
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 protected:
<> 144:ef7eb2e8f9f7 84 DigitalIn* _pin[16];
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 /** Mask of bus's NC pins
<> 144:ef7eb2e8f9f7 87 * If bit[n] is set to 1 - pin is connected
<> 144:ef7eb2e8f9f7 88 * if bit[n] is cleared - pin is not connected (NC)
<> 144:ef7eb2e8f9f7 89 */
<> 144:ef7eb2e8f9f7 90 int _nc_mask;
<> 144:ef7eb2e8f9f7 91
<> 144:ef7eb2e8f9f7 92 PlatformMutex _mutex;
<> 144:ef7eb2e8f9f7 93
<> 144:ef7eb2e8f9f7 94 /* disallow copy constructor and assignment operators */
<> 144:ef7eb2e8f9f7 95 private:
<> 144:ef7eb2e8f9f7 96 virtual void lock();
<> 144:ef7eb2e8f9f7 97 virtual void unlock();
<> 144:ef7eb2e8f9f7 98 BusIn(const BusIn&);
<> 144:ef7eb2e8f9f7 99 BusIn & operator = (const BusIn&);
<> 144:ef7eb2e8f9f7 100 };
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 } // namespace mbed
<> 144:ef7eb2e8f9f7 103
<> 144:ef7eb2e8f9f7 104 #endif