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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

api/PwmOut.h@9:0ce32e54c9a7, 2013-06-10 (annotated)

Committer:
emilmont
Date:
Mon Jun 10 16:03:00 2013 +0100
Revision:
9:0ce32e54c9a7
Parent:
cpp/PwmOut.h@2:143cac498751
Child:
10:3bc89ef62ce7
Refactoring of the mbed SDK:

- Provide a well defined HAL and API

- Keep separated the HAL implementations for the different targets

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:fd0d7bdfcdc2 1 /* mbed Microcontroller Library
emilmont 2:143cac498751 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 0:fd0d7bdfcdc2 3 *
emilmont 2:143cac498751 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 2:143cac498751 5 * you may not use this file except in compliance with the License.
emilmont 2:143cac498751 6 * You may obtain a copy of the License at
mbed_official 0:fd0d7bdfcdc2 7 *
emilmont 2:143cac498751 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 0:fd0d7bdfcdc2 9 *
emilmont 2:143cac498751 10 * Unless required by applicable law or agreed to in writing, software
emilmont 2:143cac498751 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 2:143cac498751 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 2:143cac498751 13 * See the License for the specific language governing permissions and
emilmont 2:143cac498751 14 * limitations under the License.
mbed_official 0:fd0d7bdfcdc2 15 */
mbed_official 0:fd0d7bdfcdc2 16 #ifndef MBED_PWMOUT_H
mbed_official 0:fd0d7bdfcdc2 17 #define MBED_PWMOUT_H
mbed_official 0:fd0d7bdfcdc2 18
mbed_official 0:fd0d7bdfcdc2 19 #include "platform.h"
mbed_official 0:fd0d7bdfcdc2 20
mbed_official 0:fd0d7bdfcdc2 21 #if DEVICE_PWMOUT
mbed_official 0:fd0d7bdfcdc2 22 #include "pwmout_api.h"
mbed_official 0:fd0d7bdfcdc2 23
mbed_official 0:fd0d7bdfcdc2 24 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 25
mbed_official 0:fd0d7bdfcdc2 26 /** A pulse-width modulation digital output
mbed_official 0:fd0d7bdfcdc2 27 *
mbed_official 0:fd0d7bdfcdc2 28 * Example
mbed_official 0:fd0d7bdfcdc2 29 * @code
mbed_official 0:fd0d7bdfcdc2 30 * // Fade a led on.
mbed_official 0:fd0d7bdfcdc2 31 * #include "mbed.h"
mbed_official 0:fd0d7bdfcdc2 32 *
mbed_official 0:fd0d7bdfcdc2 33 * PwmOut led(LED1);
emilmont 2:143cac498751 34 *
mbed_official 0:fd0d7bdfcdc2 35 * int main() {
mbed_official 0:fd0d7bdfcdc2 36 * while(1) {
mbed_official 0:fd0d7bdfcdc2 37 * led = led + 0.01;
mbed_official 0:fd0d7bdfcdc2 38 * wait(0.2);
mbed_official 0:fd0d7bdfcdc2 39 * if(led == 1.0) {
mbed_official 0:fd0d7bdfcdc2 40 * led = 0;
mbed_official 0:fd0d7bdfcdc2 41 * }
mbed_official 0:fd0d7bdfcdc2 42 * }
mbed_official 0:fd0d7bdfcdc2 43 * }
mbed_official 0:fd0d7bdfcdc2 44 * @endcode
mbed_official 0:fd0d7bdfcdc2 45 *
mbed_official 0:fd0d7bdfcdc2 46 * @note
mbed_official 0:fd0d7bdfcdc2 47 * On the LPC1768 and LPC2368, the PWMs all share the same
mbed_official 0:fd0d7bdfcdc2 48 * period - if you change the period for one, you change it for all.
mbed_official 0:fd0d7bdfcdc2 49 * Although routines that change the period maintain the duty cycle
mbed_official 0:fd0d7bdfcdc2 50 * for its PWM, all other PWMs will require their duty cycle to be
mbed_official 0:fd0d7bdfcdc2 51 * refreshed.
mbed_official 0:fd0d7bdfcdc2 52 */
mbed_official 0:fd0d7bdfcdc2 53 class PwmOut {
mbed_official 0:fd0d7bdfcdc2 54
mbed_official 0:fd0d7bdfcdc2 55 public:
mbed_official 0:fd0d7bdfcdc2 56
mbed_official 0:fd0d7bdfcdc2 57 /** Create a PwmOut connected to the specified pin
mbed_official 0:fd0d7bdfcdc2 58 *
mbed_official 0:fd0d7bdfcdc2 59 * @param pin PwmOut pin to connect to
mbed_official 0:fd0d7bdfcdc2 60 */
mbed_official 0:fd0d7bdfcdc2 61 PwmOut(PinName pin) {
mbed_official 0:fd0d7bdfcdc2 62 pwmout_init(&_pwm, pin);
mbed_official 0:fd0d7bdfcdc2 63 }
mbed_official 0:fd0d7bdfcdc2 64
mbed_official 0:fd0d7bdfcdc2 65 /** Set the ouput duty-cycle, specified as a percentage (float)
mbed_official 0:fd0d7bdfcdc2 66 *
emilmont 2:143cac498751 67 * @param value A floating-point value representing the output duty-cycle,
mbed_official 0:fd0d7bdfcdc2 68 * specified as a percentage. The value should lie between
mbed_official 0:fd0d7bdfcdc2 69 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
mbed_official 0:fd0d7bdfcdc2 70 * Values outside this range will be saturated to 0.0f or 1.0f.
mbed_official 0:fd0d7bdfcdc2 71 */
mbed_official 0:fd0d7bdfcdc2 72 void write(float value) {
mbed_official 0:fd0d7bdfcdc2 73 pwmout_write(&_pwm, value);
mbed_official 0:fd0d7bdfcdc2 74 }
mbed_official 0:fd0d7bdfcdc2 75
mbed_official 0:fd0d7bdfcdc2 76 /** Return the current output duty-cycle setting, measured as a percentage (float)
mbed_official 0:fd0d7bdfcdc2 77 *
mbed_official 0:fd0d7bdfcdc2 78 * @returns
emilmont 2:143cac498751 79 * A floating-point value representing the current duty-cycle being output on the pin,
mbed_official 0:fd0d7bdfcdc2 80 * measured as a percentage. The returned value will lie between
mbed_official 0:fd0d7bdfcdc2 81 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
mbed_official 0:fd0d7bdfcdc2 82 *
mbed_official 0:fd0d7bdfcdc2 83 * @note
mbed_official 0:fd0d7bdfcdc2 84 * This value may not match exactly the value set by a previous <write>.
mbed_official 0:fd0d7bdfcdc2 85 */
mbed_official 0:fd0d7bdfcdc2 86 float read() {
mbed_official 0:fd0d7bdfcdc2 87 return pwmout_read(&_pwm);
mbed_official 0:fd0d7bdfcdc2 88 }
emilmont 2:143cac498751 89
mbed_official 0:fd0d7bdfcdc2 90 /** Set the PWM period, specified in seconds (float), keeping the duty cycle the same.
mbed_official 0:fd0d7bdfcdc2 91 *
mbed_official 0:fd0d7bdfcdc2 92 * @note
mbed_official 0:fd0d7bdfcdc2 93 * The resolution is currently in microseconds; periods smaller than this
mbed_official 0:fd0d7bdfcdc2 94 * will be set to zero.
mbed_official 0:fd0d7bdfcdc2 95 */
mbed_official 0:fd0d7bdfcdc2 96 void period(float seconds) {
mbed_official 0:fd0d7bdfcdc2 97 pwmout_period(&_pwm, seconds);
mbed_official 0:fd0d7bdfcdc2 98 }
mbed_official 0:fd0d7bdfcdc2 99
mbed_official 0:fd0d7bdfcdc2 100 /** Set the PWM period, specified in milli-seconds (int), keeping the duty cycle the same.
mbed_official 0:fd0d7bdfcdc2 101 */
mbed_official 0:fd0d7bdfcdc2 102 void period_ms(int ms) {
mbed_official 0:fd0d7bdfcdc2 103 pwmout_period_ms(&_pwm, ms);
mbed_official 0:fd0d7bdfcdc2 104 }
mbed_official 0:fd0d7bdfcdc2 105
mbed_official 0:fd0d7bdfcdc2 106 /** Set the PWM period, specified in micro-seconds (int), keeping the duty cycle the same.
mbed_official 0:fd0d7bdfcdc2 107 */
mbed_official 0:fd0d7bdfcdc2 108 void period_us(int us) {
mbed_official 0:fd0d7bdfcdc2 109 pwmout_period_us(&_pwm, us);
mbed_official 0:fd0d7bdfcdc2 110 }
mbed_official 0:fd0d7bdfcdc2 111
mbed_official 0:fd0d7bdfcdc2 112 /** Set the PWM pulsewidth, specified in seconds (float), keeping the period the same.
mbed_official 0:fd0d7bdfcdc2 113 */
mbed_official 0:fd0d7bdfcdc2 114 void pulsewidth(float seconds) {
mbed_official 0:fd0d7bdfcdc2 115 pwmout_pulsewidth(&_pwm, seconds);
mbed_official 0:fd0d7bdfcdc2 116 }
mbed_official 0:fd0d7bdfcdc2 117
mbed_official 0:fd0d7bdfcdc2 118 /** Set the PWM pulsewidth, specified in milli-seconds (int), keeping the period the same.
mbed_official 0:fd0d7bdfcdc2 119 */
mbed_official 0:fd0d7bdfcdc2 120 void pulsewidth_ms(int ms) {
mbed_official 0:fd0d7bdfcdc2 121 pwmout_pulsewidth_ms(&_pwm, ms);
mbed_official 0:fd0d7bdfcdc2 122 }
mbed_official 0:fd0d7bdfcdc2 123
mbed_official 0:fd0d7bdfcdc2 124 /** Set the PWM pulsewidth, specified in micro-seconds (int), keeping the period the same.
mbed_official 0:fd0d7bdfcdc2 125 */
mbed_official 0:fd0d7bdfcdc2 126 void pulsewidth_us(int us) {
mbed_official 0:fd0d7bdfcdc2 127 pwmout_pulsewidth_us(&_pwm, us);
mbed_official 0:fd0d7bdfcdc2 128 }
mbed_official 0:fd0d7bdfcdc2 129
mbed_official 0:fd0d7bdfcdc2 130 #ifdef MBED_OPERATORS
mbed_official 0:fd0d7bdfcdc2 131 /** A operator shorthand for write()
mbed_official 0:fd0d7bdfcdc2 132 */
mbed_official 0:fd0d7bdfcdc2 133 PwmOut& operator= (float value) {
mbed_official 0:fd0d7bdfcdc2 134 write(value);
mbed_official 0:fd0d7bdfcdc2 135 return *this;
mbed_official 0:fd0d7bdfcdc2 136 }
emilmont 2:143cac498751 137
mbed_official 0:fd0d7bdfcdc2 138 PwmOut& operator= (PwmOut& rhs) {
mbed_official 0:fd0d7bdfcdc2 139 write(rhs.read());
mbed_official 0:fd0d7bdfcdc2 140 return *this;
mbed_official 0:fd0d7bdfcdc2 141 }
emilmont 2:143cac498751 142
mbed_official 0:fd0d7bdfcdc2 143 /** An operator shorthand for read()
mbed_official 0:fd0d7bdfcdc2 144 */
mbed_official 0:fd0d7bdfcdc2 145 operator float() {
mbed_official 0:fd0d7bdfcdc2 146 return read();
mbed_official 0:fd0d7bdfcdc2 147 }
mbed_official 0:fd0d7bdfcdc2 148 #endif
mbed_official 0:fd0d7bdfcdc2 149
mbed_official 0:fd0d7bdfcdc2 150 protected:
mbed_official 0:fd0d7bdfcdc2 151 pwmout_t _pwm;
mbed_official 0:fd0d7bdfcdc2 152 };
mbed_official 0:fd0d7bdfcdc2 153
mbed_official 0:fd0d7bdfcdc2 154 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 155
mbed_official 0:fd0d7bdfcdc2 156 #endif
mbed_official 0:fd0d7bdfcdc2 157
mbed_official 0:fd0d7bdfcdc2 158 #endif