Gordon Craig / mbed-dev

Forked.

Fork of mbed-dev by mbed official

drivers/PwmOut.h@174:ed647f63e28d, 2017-12-19 (annotated)

Committer:
Dollyparton
Date:
Tue Dec 19 12:50:13 2017 +0000
Revision:
174:ed647f63e28d
Parent:
167:e84263d55307 
Added RAW socket.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2013 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #ifndef MBED_PWMOUT_H
<> 149:156823d33999 17 #define MBED_PWMOUT_H
<> 149:156823d33999 18
<> 149:156823d33999 19 #include "platform/platform.h"
<> 149:156823d33999 20
AnnaBridge 167:e84263d55307 21 #if defined (DEVICE_PWMOUT) || defined(DOXYGEN_ONLY)
<> 149:156823d33999 22 #include "hal/pwmout_api.h"
<> 160:d5399cc887bb 23 #include "platform/mbed_critical.h"
<> 149:156823d33999 24
<> 149:156823d33999 25 namespace mbed {
<> 149:156823d33999 26 /** \addtogroup drivers */
<> 149:156823d33999 27
<> 149:156823d33999 28 /** A pulse-width modulation digital output
<> 149:156823d33999 29 *
AnnaBridge 167:e84263d55307 30 * @note Synchronization level: Interrupt safe
<> 149:156823d33999 31 *
<> 149:156823d33999 32 * Example
<> 149:156823d33999 33 * @code
<> 149:156823d33999 34 * // Fade a led on.
<> 149:156823d33999 35 * #include "mbed.h"
<> 149:156823d33999 36 *
<> 149:156823d33999 37 * PwmOut led(LED1);
<> 149:156823d33999 38 *
<> 149:156823d33999 39 * int main() {
<> 149:156823d33999 40 * while(1) {
<> 149:156823d33999 41 * led = led + 0.01;
<> 149:156823d33999 42 * wait(0.2);
<> 149:156823d33999 43 * if(led == 1.0) {
<> 149:156823d33999 44 * led = 0;
<> 149:156823d33999 45 * }
<> 149:156823d33999 46 * }
<> 149:156823d33999 47 * }
<> 149:156823d33999 48 * @endcode
AnnaBridge 167:e84263d55307 49 * @ingroup drivers
<> 149:156823d33999 50 */
<> 149:156823d33999 51 class PwmOut {
<> 149:156823d33999 52
<> 149:156823d33999 53 public:
<> 149:156823d33999 54
<> 149:156823d33999 55 /** Create a PwmOut connected to the specified pin
<> 149:156823d33999 56 *
<> 149:156823d33999 57 * @param pin PwmOut pin to connect to
<> 149:156823d33999 58 */
<> 149:156823d33999 59 PwmOut(PinName pin) {
<> 149:156823d33999 60 core_util_critical_section_enter();
<> 149:156823d33999 61 pwmout_init(&_pwm, pin);
<> 149:156823d33999 62 core_util_critical_section_exit();
<> 149:156823d33999 63 }
<> 149:156823d33999 64
<> 149:156823d33999 65 /** Set the ouput duty-cycle, specified as a percentage (float)
<> 149:156823d33999 66 *
<> 149:156823d33999 67 * @param value A floating-point value representing the output duty-cycle,
<> 149:156823d33999 68 * specified as a percentage. The value should lie between
<> 149:156823d33999 69 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
<> 149:156823d33999 70 * Values outside this range will be saturated to 0.0f or 1.0f.
<> 149:156823d33999 71 */
<> 149:156823d33999 72 void write(float value) {
<> 149:156823d33999 73 core_util_critical_section_enter();
<> 149:156823d33999 74 pwmout_write(&_pwm, value);
<> 149:156823d33999 75 core_util_critical_section_exit();
<> 149:156823d33999 76 }
<> 149:156823d33999 77
<> 149:156823d33999 78 /** Return the current output duty-cycle setting, measured as a percentage (float)
<> 149:156823d33999 79 *
<> 149:156823d33999 80 * @returns
<> 149:156823d33999 81 * A floating-point value representing the current duty-cycle being output on the pin,
<> 149:156823d33999 82 * measured as a percentage. The returned value will lie between
<> 149:156823d33999 83 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
<> 149:156823d33999 84 *
<> 149:156823d33999 85 * @note
AnnaBridge 167:e84263d55307 86 * This value may not match exactly the value set by a previous write().
<> 149:156823d33999 87 */
<> 149:156823d33999 88 float read() {
<> 149:156823d33999 89 core_util_critical_section_enter();
<> 149:156823d33999 90 float val = pwmout_read(&_pwm);
<> 149:156823d33999 91 core_util_critical_section_exit();
<> 149:156823d33999 92 return val;
<> 149:156823d33999 93 }
<> 149:156823d33999 94
<> 149:156823d33999 95 /** Set the PWM period, specified in seconds (float), keeping the duty cycle the same.
<> 149:156823d33999 96 *
AnnaBridge 167:e84263d55307 97 * @param seconds Change the period of a PWM signal in seconds (float) without modifying the duty cycle
<> 149:156823d33999 98 * @note
<> 149:156823d33999 99 * The resolution is currently in microseconds; periods smaller than this
<> 149:156823d33999 100 * will be set to zero.
<> 149:156823d33999 101 */
<> 149:156823d33999 102 void period(float seconds) {
<> 149:156823d33999 103 core_util_critical_section_enter();
<> 149:156823d33999 104 pwmout_period(&_pwm, seconds);
<> 149:156823d33999 105 core_util_critical_section_exit();
<> 149:156823d33999 106 }
<> 149:156823d33999 107
<> 149:156823d33999 108 /** Set the PWM period, specified in milli-seconds (int), keeping the duty cycle the same.
AnnaBridge 167:e84263d55307 109 * @param ms Change the period of a PWM signal in milli-seconds without modifying the duty cycle
<> 149:156823d33999 110 */
<> 149:156823d33999 111 void period_ms(int ms) {
<> 149:156823d33999 112 core_util_critical_section_enter();
<> 149:156823d33999 113 pwmout_period_ms(&_pwm, ms);
<> 149:156823d33999 114 core_util_critical_section_exit();
<> 149:156823d33999 115 }
<> 149:156823d33999 116
<> 149:156823d33999 117 /** Set the PWM period, specified in micro-seconds (int), keeping the duty cycle the same.
AnnaBridge 167:e84263d55307 118 * @param us Change the period of a PWM signal in micro-seconds without modifying the duty cycle
<> 149:156823d33999 119 */
<> 149:156823d33999 120 void period_us(int us) {
<> 149:156823d33999 121 core_util_critical_section_enter();
<> 149:156823d33999 122 pwmout_period_us(&_pwm, us);
<> 149:156823d33999 123 core_util_critical_section_exit();
<> 149:156823d33999 124 }
<> 149:156823d33999 125
<> 149:156823d33999 126 /** Set the PWM pulsewidth, specified in seconds (float), keeping the period the same.
AnnaBridge 167:e84263d55307 127 * @param seconds Change the pulse width of a PWM signal specified in seconds (float)
<> 149:156823d33999 128 */
<> 149:156823d33999 129 void pulsewidth(float seconds) {
<> 149:156823d33999 130 core_util_critical_section_enter();
<> 149:156823d33999 131 pwmout_pulsewidth(&_pwm, seconds);
<> 149:156823d33999 132 core_util_critical_section_exit();
<> 149:156823d33999 133 }
<> 149:156823d33999 134
<> 149:156823d33999 135 /** Set the PWM pulsewidth, specified in milli-seconds (int), keeping the period the same.
AnnaBridge 167:e84263d55307 136 * @param ms Change the pulse width of a PWM signal specified in milli-seconds
<> 149:156823d33999 137 */
<> 149:156823d33999 138 void pulsewidth_ms(int ms) {
<> 149:156823d33999 139 core_util_critical_section_enter();
<> 149:156823d33999 140 pwmout_pulsewidth_ms(&_pwm, ms);
<> 149:156823d33999 141 core_util_critical_section_exit();
<> 149:156823d33999 142 }
<> 149:156823d33999 143
<> 149:156823d33999 144 /** Set the PWM pulsewidth, specified in micro-seconds (int), keeping the period the same.
AnnaBridge 167:e84263d55307 145 * @param us Change the pulse width of a PWM signal specified in micro-seconds
<> 149:156823d33999 146 */
<> 149:156823d33999 147 void pulsewidth_us(int us) {
<> 149:156823d33999 148 core_util_critical_section_enter();
<> 149:156823d33999 149 pwmout_pulsewidth_us(&_pwm, us);
<> 149:156823d33999 150 core_util_critical_section_exit();
<> 149:156823d33999 151 }
<> 149:156823d33999 152
<> 149:156823d33999 153 /** A operator shorthand for write()
AnnaBridge 167:e84263d55307 154 * \sa PwmOut::write()
<> 149:156823d33999 155 */
<> 149:156823d33999 156 PwmOut& operator= (float value) {
<> 149:156823d33999 157 // Underlying call is thread safe
<> 149:156823d33999 158 write(value);
<> 149:156823d33999 159 return *this;
<> 149:156823d33999 160 }
<> 149:156823d33999 161
AnnaBridge 167:e84263d55307 162 /** A operator shorthand for write()
AnnaBridge 167:e84263d55307 163 * \sa PwmOut::write()
AnnaBridge 167:e84263d55307 164 */
<> 149:156823d33999 165 PwmOut& operator= (PwmOut& rhs) {
<> 149:156823d33999 166 // Underlying call is thread safe
<> 149:156823d33999 167 write(rhs.read());
<> 149:156823d33999 168 return *this;
<> 149:156823d33999 169 }
<> 149:156823d33999 170
<> 149:156823d33999 171 /** An operator shorthand for read()
AnnaBridge 167:e84263d55307 172 * \sa PwmOut::read()
<> 149:156823d33999 173 */
<> 149:156823d33999 174 operator float() {
<> 149:156823d33999 175 // Underlying call is thread safe
<> 149:156823d33999 176 return read();
<> 149:156823d33999 177 }
<> 149:156823d33999 178
<> 149:156823d33999 179 protected:
<> 149:156823d33999 180 pwmout_t _pwm;
<> 149:156823d33999 181 };
<> 149:156823d33999 182
<> 149:156823d33999 183 } // namespace mbed
<> 149:156823d33999 184
<> 149:156823d33999 185 #endif
<> 149:156823d33999 186
<> 149:156823d33999 187 #endif