Bernhard Filzmaier / mbed-src

mbed library sources

Fork of mbed-src by mbed official

cpp/PwmOut.h@2:143cac498751, 2013-02-18 (annotated)

Committer:
emilmont
Date:
Mon Feb 18 11:44:18 2013 +0000
Revision:
2:143cac498751
Parent:
0:fd0d7bdfcdc2 
Update mbed sources to Rev 59

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