Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/BusOut.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_BUSOUT_H
<> 144:ef7eb2e8f9f7 17 #define MBED_BUSOUT_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "DigitalOut.h"
<> 144:ef7eb2e8f9f7 20 #include "PlatformMutex.h"
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 namespace mbed {
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 /** A digital output bus, used for setting the state of a collection of pins
<> 144:ef7eb2e8f9f7 25 */
<> 144:ef7eb2e8f9f7 26 class BusOut {
<> 144:ef7eb2e8f9f7 27
<> 144:ef7eb2e8f9f7 28 public:
<> 144:ef7eb2e8f9f7 29
<> 144:ef7eb2e8f9f7 30 /** Create an BusOut, connected to the specified pins
<> 144:ef7eb2e8f9f7 31 *
<> 144:ef7eb2e8f9f7 32 * @param p<n> DigitalOut pin to connect to bus bit <n> (p5-p30, NC)
<> 144:ef7eb2e8f9f7 33 *
<> 144:ef7eb2e8f9f7 34 * @Note Synchronization level: Thread safe
<> 144:ef7eb2e8f9f7 35 *
<> 144:ef7eb2e8f9f7 36 * @note
<> 144:ef7eb2e8f9f7 37 * It is only required to specify as many pin variables as is required
<> 144:ef7eb2e8f9f7 38 * for the bus; the rest will default to NC (not connected)
<> 144:ef7eb2e8f9f7 39 */
<> 144:ef7eb2e8f9f7 40 BusOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
<> 144:ef7eb2e8f9f7 41 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
<> 144:ef7eb2e8f9f7 42 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
<> 144:ef7eb2e8f9f7 43 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
<> 144:ef7eb2e8f9f7 44
<> 144:ef7eb2e8f9f7 45 BusOut(PinName pins[16]);
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 virtual ~BusOut();
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 /** Write the value to the output bus
<> 144:ef7eb2e8f9f7 50 *
<> 144:ef7eb2e8f9f7 51 * @param value An integer specifying a bit to write for every corresponding DigitalOut pin
<> 144:ef7eb2e8f9f7 52 */
<> 144:ef7eb2e8f9f7 53 void write(int value);
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55 /** Read the value currently output on the bus
<> 144:ef7eb2e8f9f7 56 *
<> 144:ef7eb2e8f9f7 57 * @returns
<> 144:ef7eb2e8f9f7 58 * An integer with each bit corresponding to associated DigitalOut pin setting
<> 144:ef7eb2e8f9f7 59 */
<> 144:ef7eb2e8f9f7 60 int read();
<> 144:ef7eb2e8f9f7 61
<> 144:ef7eb2e8f9f7 62 /** Binary mask of bus pins connected to actual pins (not NC pins)
<> 144:ef7eb2e8f9f7 63 * 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 64 *
<> 144:ef7eb2e8f9f7 65 * @returns
<> 144:ef7eb2e8f9f7 66 * Binary mask of connected pins
<> 144:ef7eb2e8f9f7 67 */
<> 144:ef7eb2e8f9f7 68 int mask() {
<> 144:ef7eb2e8f9f7 69 // No lock needed since _nc_mask is not modified outside the constructor
<> 144:ef7eb2e8f9f7 70 return _nc_mask;
<> 144:ef7eb2e8f9f7 71 }
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 /** A shorthand for write()
<> 144:ef7eb2e8f9f7 74 */
<> 144:ef7eb2e8f9f7 75 BusOut& operator= (int v);
<> 144:ef7eb2e8f9f7 76 BusOut& operator= (BusOut& rhs);
<> 144:ef7eb2e8f9f7 77
<> 144:ef7eb2e8f9f7 78 /** Access to particular bit in random-iterator fashion
<> 144:ef7eb2e8f9f7 79 */
<> 144:ef7eb2e8f9f7 80 DigitalOut& operator[] (int index);
<> 144:ef7eb2e8f9f7 81
<> 144:ef7eb2e8f9f7 82 /** A shorthand for read()
<> 144:ef7eb2e8f9f7 83 */
<> 144:ef7eb2e8f9f7 84 operator int();
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 protected:
<> 144:ef7eb2e8f9f7 87 virtual void lock();
<> 144:ef7eb2e8f9f7 88 virtual void unlock();
<> 144:ef7eb2e8f9f7 89 DigitalOut* _pin[16];
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 /** Mask of bus's NC pins
<> 144:ef7eb2e8f9f7 92 * If bit[n] is set to 1 - pin is connected
<> 144:ef7eb2e8f9f7 93 * if bit[n] is cleared - pin is not connected (NC)
<> 144:ef7eb2e8f9f7 94 */
<> 144:ef7eb2e8f9f7 95 int _nc_mask;
<> 144:ef7eb2e8f9f7 96
<> 144:ef7eb2e8f9f7 97 PlatformMutex _mutex;
<> 144:ef7eb2e8f9f7 98
<> 144:ef7eb2e8f9f7 99 /* disallow copy constructor and assignment operators */
<> 144:ef7eb2e8f9f7 100 private:
<> 144:ef7eb2e8f9f7 101 BusOut(const BusOut&);
<> 144:ef7eb2e8f9f7 102 BusOut & operator = (const BusOut&);
<> 144:ef7eb2e8f9f7 103 };
<> 144:ef7eb2e8f9f7 104
<> 144:ef7eb2e8f9f7 105 } // namespace mbed
<> 144:ef7eb2e8f9f7 106
<> 144:ef7eb2e8f9f7 107 #endif