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mbed SDK library sources

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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

cpp/PwmOut.h@0:fd0d7bdfcdc2, 2012-11-20 (annotated)

Committer:
mbed_official
Date:
Tue Nov 20 17:24:08 2012 +0000
Revision:
0:fd0d7bdfcdc2
Child:
2:143cac498751
mbed sources

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:fd0d7bdfcdc2 1 /* mbed Microcontroller Library
mbed_official 0:fd0d7bdfcdc2 2 * Copyright (c) 2006-2012 ARM Limited
mbed_official 0:fd0d7bdfcdc2 3 *
mbed_official 0:fd0d7bdfcdc2 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mbed_official 0:fd0d7bdfcdc2 5 * of this software and associated documentation files (the "Software"), to deal
mbed_official 0:fd0d7bdfcdc2 6 * in the Software without restriction, including without limitation the rights
mbed_official 0:fd0d7bdfcdc2 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mbed_official 0:fd0d7bdfcdc2 8 * copies of the Software, and to permit persons to whom the Software is
mbed_official 0:fd0d7bdfcdc2 9 * furnished to do so, subject to the following conditions:
mbed_official 0:fd0d7bdfcdc2 10 *
mbed_official 0:fd0d7bdfcdc2 11 * The above copyright notice and this permission notice shall be included in
mbed_official 0:fd0d7bdfcdc2 12 * all copies or substantial portions of the Software.
mbed_official 0:fd0d7bdfcdc2 13 *
mbed_official 0:fd0d7bdfcdc2 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mbed_official 0:fd0d7bdfcdc2 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mbed_official 0:fd0d7bdfcdc2 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mbed_official 0:fd0d7bdfcdc2 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mbed_official 0:fd0d7bdfcdc2 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mbed_official 0:fd0d7bdfcdc2 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
mbed_official 0:fd0d7bdfcdc2 20 * SOFTWARE.
mbed_official 0:fd0d7bdfcdc2 21 */
mbed_official 0:fd0d7bdfcdc2 22 #ifndef MBED_PWMOUT_H
mbed_official 0:fd0d7bdfcdc2 23 #define MBED_PWMOUT_H
mbed_official 0:fd0d7bdfcdc2 24
mbed_official 0:fd0d7bdfcdc2 25 #include "platform.h"
mbed_official 0:fd0d7bdfcdc2 26
mbed_official 0:fd0d7bdfcdc2 27 #if DEVICE_PWMOUT
mbed_official 0:fd0d7bdfcdc2 28 #include "pwmout_api.h"
mbed_official 0:fd0d7bdfcdc2 29
mbed_official 0:fd0d7bdfcdc2 30 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 31
mbed_official 0:fd0d7bdfcdc2 32 /** A pulse-width modulation digital output
mbed_official 0:fd0d7bdfcdc2 33 *
mbed_official 0:fd0d7bdfcdc2 34 * Example
mbed_official 0:fd0d7bdfcdc2 35 * @code
mbed_official 0:fd0d7bdfcdc2 36 * // Fade a led on.
mbed_official 0:fd0d7bdfcdc2 37 * #include "mbed.h"
mbed_official 0:fd0d7bdfcdc2 38 *
mbed_official 0:fd0d7bdfcdc2 39 * PwmOut led(LED1);
mbed_official 0:fd0d7bdfcdc2 40 *
mbed_official 0:fd0d7bdfcdc2 41 * int main() {
mbed_official 0:fd0d7bdfcdc2 42 * while(1) {
mbed_official 0:fd0d7bdfcdc2 43 * led = led + 0.01;
mbed_official 0:fd0d7bdfcdc2 44 * wait(0.2);
mbed_official 0:fd0d7bdfcdc2 45 * if(led == 1.0) {
mbed_official 0:fd0d7bdfcdc2 46 * led = 0;
mbed_official 0:fd0d7bdfcdc2 47 * }
mbed_official 0:fd0d7bdfcdc2 48 * }
mbed_official 0:fd0d7bdfcdc2 49 * }
mbed_official 0:fd0d7bdfcdc2 50 * @endcode
mbed_official 0:fd0d7bdfcdc2 51 *
mbed_official 0:fd0d7bdfcdc2 52 * @note
mbed_official 0:fd0d7bdfcdc2 53 * On the LPC1768 and LPC2368, the PWMs all share the same
mbed_official 0:fd0d7bdfcdc2 54 * period - if you change the period for one, you change it for all.
mbed_official 0:fd0d7bdfcdc2 55 * Although routines that change the period maintain the duty cycle
mbed_official 0:fd0d7bdfcdc2 56 * for its PWM, all other PWMs will require their duty cycle to be
mbed_official 0:fd0d7bdfcdc2 57 * refreshed.
mbed_official 0:fd0d7bdfcdc2 58 */
mbed_official 0:fd0d7bdfcdc2 59 class PwmOut {
mbed_official 0:fd0d7bdfcdc2 60
mbed_official 0:fd0d7bdfcdc2 61 public:
mbed_official 0:fd0d7bdfcdc2 62
mbed_official 0:fd0d7bdfcdc2 63 /** Create a PwmOut connected to the specified pin
mbed_official 0:fd0d7bdfcdc2 64 *
mbed_official 0:fd0d7bdfcdc2 65 * @param pin PwmOut pin to connect to
mbed_official 0:fd0d7bdfcdc2 66 */
mbed_official 0:fd0d7bdfcdc2 67 PwmOut(PinName pin) {
mbed_official 0:fd0d7bdfcdc2 68 pwmout_init(&_pwm, pin);
mbed_official 0:fd0d7bdfcdc2 69 }
mbed_official 0:fd0d7bdfcdc2 70
mbed_official 0:fd0d7bdfcdc2 71 /** Set the ouput duty-cycle, specified as a percentage (float)
mbed_official 0:fd0d7bdfcdc2 72 *
mbed_official 0:fd0d7bdfcdc2 73 * @param value A floating-point value representing the output duty-cycle,
mbed_official 0:fd0d7bdfcdc2 74 * specified as a percentage. The value should lie between
mbed_official 0:fd0d7bdfcdc2 75 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
mbed_official 0:fd0d7bdfcdc2 76 * Values outside this range will be saturated to 0.0f or 1.0f.
mbed_official 0:fd0d7bdfcdc2 77 */
mbed_official 0:fd0d7bdfcdc2 78 void write(float value) {
mbed_official 0:fd0d7bdfcdc2 79 pwmout_write(&_pwm, value);
mbed_official 0:fd0d7bdfcdc2 80 }
mbed_official 0:fd0d7bdfcdc2 81
mbed_official 0:fd0d7bdfcdc2 82 /** Return the current output duty-cycle setting, measured as a percentage (float)
mbed_official 0:fd0d7bdfcdc2 83 *
mbed_official 0:fd0d7bdfcdc2 84 * @returns
mbed_official 0:fd0d7bdfcdc2 85 * A floating-point value representing the current duty-cycle being output on the pin,
mbed_official 0:fd0d7bdfcdc2 86 * measured as a percentage. The returned value will lie between
mbed_official 0:fd0d7bdfcdc2 87 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
mbed_official 0:fd0d7bdfcdc2 88 *
mbed_official 0:fd0d7bdfcdc2 89 * @note
mbed_official 0:fd0d7bdfcdc2 90 * This value may not match exactly the value set by a previous <write>.
mbed_official 0:fd0d7bdfcdc2 91 */
mbed_official 0:fd0d7bdfcdc2 92 float read() {
mbed_official 0:fd0d7bdfcdc2 93 return pwmout_read(&_pwm);
mbed_official 0:fd0d7bdfcdc2 94 }
mbed_official 0:fd0d7bdfcdc2 95
mbed_official 0:fd0d7bdfcdc2 96 /** Set the PWM period, specified in seconds (float), keeping the duty cycle the same.
mbed_official 0:fd0d7bdfcdc2 97 *
mbed_official 0:fd0d7bdfcdc2 98 * @note
mbed_official 0:fd0d7bdfcdc2 99 * The resolution is currently in microseconds; periods smaller than this
mbed_official 0:fd0d7bdfcdc2 100 * will be set to zero.
mbed_official 0:fd0d7bdfcdc2 101 */
mbed_official 0:fd0d7bdfcdc2 102 void period(float seconds) {
mbed_official 0:fd0d7bdfcdc2 103 pwmout_period(&_pwm, seconds);
mbed_official 0:fd0d7bdfcdc2 104 }
mbed_official 0:fd0d7bdfcdc2 105
mbed_official 0:fd0d7bdfcdc2 106 /** Set the PWM period, specified in milli-seconds (int), keeping the duty cycle the same.
mbed_official 0:fd0d7bdfcdc2 107 */
mbed_official 0:fd0d7bdfcdc2 108 void period_ms(int ms) {
mbed_official 0:fd0d7bdfcdc2 109 pwmout_period_ms(&_pwm, ms);
mbed_official 0:fd0d7bdfcdc2 110 }
mbed_official 0:fd0d7bdfcdc2 111
mbed_official 0:fd0d7bdfcdc2 112 /** Set the PWM period, specified in micro-seconds (int), keeping the duty cycle the same.
mbed_official 0:fd0d7bdfcdc2 113 */
mbed_official 0:fd0d7bdfcdc2 114 void period_us(int us) {
mbed_official 0:fd0d7bdfcdc2 115 pwmout_period_us(&_pwm, us);
mbed_official 0:fd0d7bdfcdc2 116 }
mbed_official 0:fd0d7bdfcdc2 117
mbed_official 0:fd0d7bdfcdc2 118 /** Set the PWM pulsewidth, specified in seconds (float), keeping the period the same.
mbed_official 0:fd0d7bdfcdc2 119 */
mbed_official 0:fd0d7bdfcdc2 120 void pulsewidth(float seconds) {
mbed_official 0:fd0d7bdfcdc2 121 pwmout_pulsewidth(&_pwm, seconds);
mbed_official 0:fd0d7bdfcdc2 122 }
mbed_official 0:fd0d7bdfcdc2 123
mbed_official 0:fd0d7bdfcdc2 124 /** Set the PWM pulsewidth, specified in milli-seconds (int), keeping the period the same.
mbed_official 0:fd0d7bdfcdc2 125 */
mbed_official 0:fd0d7bdfcdc2 126 void pulsewidth_ms(int ms) {
mbed_official 0:fd0d7bdfcdc2 127 pwmout_pulsewidth_ms(&_pwm, ms);
mbed_official 0:fd0d7bdfcdc2 128 }
mbed_official 0:fd0d7bdfcdc2 129
mbed_official 0:fd0d7bdfcdc2 130 /** Set the PWM pulsewidth, specified in micro-seconds (int), keeping the period the same.
mbed_official 0:fd0d7bdfcdc2 131 */
mbed_official 0:fd0d7bdfcdc2 132 void pulsewidth_us(int us) {
mbed_official 0:fd0d7bdfcdc2 133 pwmout_pulsewidth_us(&_pwm, us);
mbed_official 0:fd0d7bdfcdc2 134 }
mbed_official 0:fd0d7bdfcdc2 135
mbed_official 0:fd0d7bdfcdc2 136 #ifdef MBED_OPERATORS
mbed_official 0:fd0d7bdfcdc2 137 /** A operator shorthand for write()
mbed_official 0:fd0d7bdfcdc2 138 */
mbed_official 0:fd0d7bdfcdc2 139 PwmOut& operator= (float value) {
mbed_official 0:fd0d7bdfcdc2 140 write(value);
mbed_official 0:fd0d7bdfcdc2 141 return *this;
mbed_official 0:fd0d7bdfcdc2 142 }
mbed_official 0:fd0d7bdfcdc2 143
mbed_official 0:fd0d7bdfcdc2 144 PwmOut& operator= (PwmOut& rhs) {
mbed_official 0:fd0d7bdfcdc2 145 write(rhs.read());
mbed_official 0:fd0d7bdfcdc2 146 return *this;
mbed_official 0:fd0d7bdfcdc2 147 }
mbed_official 0:fd0d7bdfcdc2 148
mbed_official 0:fd0d7bdfcdc2 149 /** An operator shorthand for read()
mbed_official 0:fd0d7bdfcdc2 150 */
mbed_official 0:fd0d7bdfcdc2 151 operator float() {
mbed_official 0:fd0d7bdfcdc2 152 return read();
mbed_official 0:fd0d7bdfcdc2 153 }
mbed_official 0:fd0d7bdfcdc2 154 #endif
mbed_official 0:fd0d7bdfcdc2 155
mbed_official 0:fd0d7bdfcdc2 156 protected:
mbed_official 0:fd0d7bdfcdc2 157 pwmout_t _pwm;
mbed_official 0:fd0d7bdfcdc2 158 };
mbed_official 0:fd0d7bdfcdc2 159
mbed_official 0:fd0d7bdfcdc2 160 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 161
mbed_official 0:fd0d7bdfcdc2 162 #endif
mbed_official 0:fd0d7bdfcdc2 163
mbed_official 0:fd0d7bdfcdc2 164 #endif