Aravind Vadali / mbed-src-AV

mbed.h library with any bug fixes AV finds.

Dependents:   micromouse4_encoder_testing PID_Test Lab1_Test WorkingPID ... more

api/PwmOut.h@1:ebce2ad32f95, 2015-11-02 (annotated)

Committer:
aravindsv
Date:
Mon Nov 02 03:07:12 2015 +0000
Revision:
1:ebce2ad32f95
Parent:
0:ba7650f404af 
Changed the RCC timeout value to 500 ms, so total code startup time before program starts running is ~1s. Hopefully no side-effects from lower startup timeouts

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aravindsv 0:ba7650f404af 1 /* mbed Microcontroller Library
aravindsv 0:ba7650f404af 2 * Copyright (c) 2006-2013 ARM Limited
aravindsv 0:ba7650f404af 3 *
aravindsv 0:ba7650f404af 4 * Licensed under the Apache License, Version 2.0 (the "License");
aravindsv 0:ba7650f404af 5 * you may not use this file except in compliance with the License.
aravindsv 0:ba7650f404af 6 * You may obtain a copy of the License at
aravindsv 0:ba7650f404af 7 *
aravindsv 0:ba7650f404af 8 * http://www.apache.org/licenses/LICENSE-2.0
aravindsv 0:ba7650f404af 9 *
aravindsv 0:ba7650f404af 10 * Unless required by applicable law or agreed to in writing, software
aravindsv 0:ba7650f404af 11 * distributed under the License is distributed on an "AS IS" BASIS,
aravindsv 0:ba7650f404af 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
aravindsv 0:ba7650f404af 13 * See the License for the specific language governing permissions and
aravindsv 0:ba7650f404af 14 * limitations under the License.
aravindsv 0:ba7650f404af 15 */
aravindsv 0:ba7650f404af 16 #ifndef MBED_PWMOUT_H
aravindsv 0:ba7650f404af 17 #define MBED_PWMOUT_H
aravindsv 0:ba7650f404af 18
aravindsv 0:ba7650f404af 19 #include "platform.h"
aravindsv 0:ba7650f404af 20
aravindsv 0:ba7650f404af 21 #if DEVICE_PWMOUT
aravindsv 0:ba7650f404af 22 #include "pwmout_api.h"
aravindsv 0:ba7650f404af 23
aravindsv 0:ba7650f404af 24 namespace mbed {
aravindsv 0:ba7650f404af 25
aravindsv 0:ba7650f404af 26 /** A pulse-width modulation digital output
aravindsv 0:ba7650f404af 27 *
aravindsv 0:ba7650f404af 28 * Example
aravindsv 0:ba7650f404af 29 * @code
aravindsv 0:ba7650f404af 30 * // Fade a led on.
aravindsv 0:ba7650f404af 31 * #include "mbed.h"
aravindsv 0:ba7650f404af 32 *
aravindsv 0:ba7650f404af 33 * PwmOut led(LED1);
aravindsv 0:ba7650f404af 34 *
aravindsv 0:ba7650f404af 35 * int main() {
aravindsv 0:ba7650f404af 36 * while(1) {
aravindsv 0:ba7650f404af 37 * led = led + 0.01;
aravindsv 0:ba7650f404af 38 * wait(0.2);
aravindsv 0:ba7650f404af 39 * if(led == 1.0) {
aravindsv 0:ba7650f404af 40 * led = 0;
aravindsv 0:ba7650f404af 41 * }
aravindsv 0:ba7650f404af 42 * }
aravindsv 0:ba7650f404af 43 * }
aravindsv 0:ba7650f404af 44 * @endcode
aravindsv 0:ba7650f404af 45 *
aravindsv 0:ba7650f404af 46 * @note
aravindsv 0:ba7650f404af 47 * On the LPC1768 and LPC2368, the PWMs all share the same
aravindsv 0:ba7650f404af 48 * period - if you change the period for one, you change it for all.
aravindsv 0:ba7650f404af 49 * Although routines that change the period maintain the duty cycle
aravindsv 0:ba7650f404af 50 * for its PWM, all other PWMs will require their duty cycle to be
aravindsv 0:ba7650f404af 51 * refreshed.
aravindsv 0:ba7650f404af 52 */
aravindsv 0:ba7650f404af 53 class PwmOut {
aravindsv 0:ba7650f404af 54
aravindsv 0:ba7650f404af 55 public:
aravindsv 0:ba7650f404af 56
aravindsv 0:ba7650f404af 57 /** Create a PwmOut connected to the specified pin
aravindsv 0:ba7650f404af 58 *
aravindsv 0:ba7650f404af 59 * @param pin PwmOut pin to connect to
aravindsv 0:ba7650f404af 60 */
aravindsv 0:ba7650f404af 61 PwmOut(PinName pin) {
aravindsv 0:ba7650f404af 62 pwmout_init(&_pwm, pin);
aravindsv 0:ba7650f404af 63 }
aravindsv 0:ba7650f404af 64
aravindsv 0:ba7650f404af 65 /** Set the ouput duty-cycle, specified as a percentage (float)
aravindsv 0:ba7650f404af 66 *
aravindsv 0:ba7650f404af 67 * @param value A floating-point value representing the output duty-cycle,
aravindsv 0:ba7650f404af 68 * specified as a percentage. The value should lie between
aravindsv 0:ba7650f404af 69 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
aravindsv 0:ba7650f404af 70 * Values outside this range will be saturated to 0.0f or 1.0f.
aravindsv 0:ba7650f404af 71 */
aravindsv 0:ba7650f404af 72 void write(float value) {
aravindsv 0:ba7650f404af 73 pwmout_write(&_pwm, value);
aravindsv 0:ba7650f404af 74 }
aravindsv 0:ba7650f404af 75
aravindsv 0:ba7650f404af 76 /** Return the current output duty-cycle setting, measured as a percentage (float)
aravindsv 0:ba7650f404af 77 *
aravindsv 0:ba7650f404af 78 * @returns
aravindsv 0:ba7650f404af 79 * A floating-point value representing the current duty-cycle being output on the pin,
aravindsv 0:ba7650f404af 80 * measured as a percentage. The returned value will lie between
aravindsv 0:ba7650f404af 81 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
aravindsv 0:ba7650f404af 82 *
aravindsv 0:ba7650f404af 83 * @note
aravindsv 0:ba7650f404af 84 * This value may not match exactly the value set by a previous <write>.
aravindsv 0:ba7650f404af 85 */
aravindsv 0:ba7650f404af 86 float read() {
aravindsv 0:ba7650f404af 87 return pwmout_read(&_pwm);
aravindsv 0:ba7650f404af 88 }
aravindsv 0:ba7650f404af 89
aravindsv 0:ba7650f404af 90 /** Set the PWM period, specified in seconds (float), keeping the duty cycle the same.
aravindsv 0:ba7650f404af 91 *
aravindsv 0:ba7650f404af 92 * @note
aravindsv 0:ba7650f404af 93 * The resolution is currently in microseconds; periods smaller than this
aravindsv 0:ba7650f404af 94 * will be set to zero.
aravindsv 0:ba7650f404af 95 */
aravindsv 0:ba7650f404af 96 void period(float seconds) {
aravindsv 0:ba7650f404af 97 pwmout_period(&_pwm, seconds);
aravindsv 0:ba7650f404af 98 }
aravindsv 0:ba7650f404af 99
aravindsv 0:ba7650f404af 100 /** Set the PWM period, specified in milli-seconds (int), keeping the duty cycle the same.
aravindsv 0:ba7650f404af 101 */
aravindsv 0:ba7650f404af 102 void period_ms(int ms) {
aravindsv 0:ba7650f404af 103 pwmout_period_ms(&_pwm, ms);
aravindsv 0:ba7650f404af 104 }
aravindsv 0:ba7650f404af 105
aravindsv 0:ba7650f404af 106 /** Set the PWM period, specified in micro-seconds (int), keeping the duty cycle the same.
aravindsv 0:ba7650f404af 107 */
aravindsv 0:ba7650f404af 108 void period_us(int us) {
aravindsv 0:ba7650f404af 109 pwmout_period_us(&_pwm, us);
aravindsv 0:ba7650f404af 110 }
aravindsv 0:ba7650f404af 111
aravindsv 0:ba7650f404af 112 /** Set the PWM pulsewidth, specified in seconds (float), keeping the period the same.
aravindsv 0:ba7650f404af 113 */
aravindsv 0:ba7650f404af 114 void pulsewidth(float seconds) {
aravindsv 0:ba7650f404af 115 pwmout_pulsewidth(&_pwm, seconds);
aravindsv 0:ba7650f404af 116 }
aravindsv 0:ba7650f404af 117
aravindsv 0:ba7650f404af 118 /** Set the PWM pulsewidth, specified in milli-seconds (int), keeping the period the same.
aravindsv 0:ba7650f404af 119 */
aravindsv 0:ba7650f404af 120 void pulsewidth_ms(int ms) {
aravindsv 0:ba7650f404af 121 pwmout_pulsewidth_ms(&_pwm, ms);
aravindsv 0:ba7650f404af 122 }
aravindsv 0:ba7650f404af 123
aravindsv 0:ba7650f404af 124 /** Set the PWM pulsewidth, specified in micro-seconds (int), keeping the period the same.
aravindsv 0:ba7650f404af 125 */
aravindsv 0:ba7650f404af 126 void pulsewidth_us(int us) {
aravindsv 0:ba7650f404af 127 pwmout_pulsewidth_us(&_pwm, us);
aravindsv 0:ba7650f404af 128 }
aravindsv 0:ba7650f404af 129
aravindsv 0:ba7650f404af 130 #ifdef MBED_OPERATORS
aravindsv 0:ba7650f404af 131 /** A operator shorthand for write()
aravindsv 0:ba7650f404af 132 */
aravindsv 0:ba7650f404af 133 PwmOut& operator= (float value) {
aravindsv 0:ba7650f404af 134 write(value);
aravindsv 0:ba7650f404af 135 return *this;
aravindsv 0:ba7650f404af 136 }
aravindsv 0:ba7650f404af 137
aravindsv 0:ba7650f404af 138 PwmOut& operator= (PwmOut& rhs) {
aravindsv 0:ba7650f404af 139 write(rhs.read());
aravindsv 0:ba7650f404af 140 return *this;
aravindsv 0:ba7650f404af 141 }
aravindsv 0:ba7650f404af 142
aravindsv 0:ba7650f404af 143 /** An operator shorthand for read()
aravindsv 0:ba7650f404af 144 */
aravindsv 0:ba7650f404af 145 operator float() {
aravindsv 0:ba7650f404af 146 return read();
aravindsv 0:ba7650f404af 147 }
aravindsv 0:ba7650f404af 148 #endif
aravindsv 0:ba7650f404af 149
aravindsv 0:ba7650f404af 150 protected:
aravindsv 0:ba7650f404af 151 pwmout_t _pwm;
aravindsv 0:ba7650f404af 152 };
aravindsv 0:ba7650f404af 153
aravindsv 0:ba7650f404af 154 } // namespace mbed
aravindsv 0:ba7650f404af 155
aravindsv 0:ba7650f404af 156 #endif
aravindsv 0:ba7650f404af 157
aravindsv 0:ba7650f404af 158 #endif