Jing Qiu / mbed

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Fork of mbed by gokmen ascioglu

PwmOut.h@1:27d81db81dd7, 2015-03-03 (annotated)

Committer:
Jing_Qiu
Date:
Tue Mar 03 00:55:57 2015 +0000
Revision:
1:27d81db81dd7
Parent:
0:a8fa94490a0a 
revise

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gokmenascioglu 0:a8fa94490a0a 1 /* mbed Microcontroller Library - PwmOut
gokmenascioglu 0:a8fa94490a0a 2 * Copyright (c) 2007-2011 ARM Limited. All rights reserved.
gokmenascioglu 0:a8fa94490a0a 3 */
gokmenascioglu 0:a8fa94490a0a 4
gokmenascioglu 0:a8fa94490a0a 5 #ifndef MBED_PWMOUT_H
gokmenascioglu 0:a8fa94490a0a 6 #define MBED_PWMOUT_H
gokmenascioglu 0:a8fa94490a0a 7
gokmenascioglu 0:a8fa94490a0a 8 #include "device.h"
gokmenascioglu 0:a8fa94490a0a 9
gokmenascioglu 0:a8fa94490a0a 10 #if DEVICE_PWMOUT
gokmenascioglu 0:a8fa94490a0a 11
gokmenascioglu 0:a8fa94490a0a 12 #include "platform.h"
gokmenascioglu 0:a8fa94490a0a 13 #include "PinNames.h"
gokmenascioglu 0:a8fa94490a0a 14 #include "PeripheralNames.h"
gokmenascioglu 0:a8fa94490a0a 15 #include "Base.h"
gokmenascioglu 0:a8fa94490a0a 16
gokmenascioglu 0:a8fa94490a0a 17 namespace mbed {
gokmenascioglu 0:a8fa94490a0a 18
gokmenascioglu 0:a8fa94490a0a 19 /* Class: PwmOut
gokmenascioglu 0:a8fa94490a0a 20 * A pulse-width modulation digital output
gokmenascioglu 0:a8fa94490a0a 21 *
gokmenascioglu 0:a8fa94490a0a 22 * Example
gokmenascioglu 0:a8fa94490a0a 23 * > // Fade a led on.
gokmenascioglu 0:a8fa94490a0a 24 * > #include "mbed.h"
gokmenascioglu 0:a8fa94490a0a 25 * >
gokmenascioglu 0:a8fa94490a0a 26 * > PwmOut led(LED1);
gokmenascioglu 0:a8fa94490a0a 27 * >
gokmenascioglu 0:a8fa94490a0a 28 * > int main() {
gokmenascioglu 0:a8fa94490a0a 29 * > while(1) {
gokmenascioglu 0:a8fa94490a0a 30 * > led = led + 0.01;
gokmenascioglu 0:a8fa94490a0a 31 * > wait(0.2);
gokmenascioglu 0:a8fa94490a0a 32 * > if(led == 1.0) {
gokmenascioglu 0:a8fa94490a0a 33 * > led = 0;
gokmenascioglu 0:a8fa94490a0a 34 * > }
gokmenascioglu 0:a8fa94490a0a 35 * > }
gokmenascioglu 0:a8fa94490a0a 36 * > }
gokmenascioglu 0:a8fa94490a0a 37 *
gokmenascioglu 0:a8fa94490a0a 38 * Note that on the LPC1768 and LPC2368, the PWMs all share the same
gokmenascioglu 0:a8fa94490a0a 39 * period - if you change the period for one, you change it for all.
gokmenascioglu 0:a8fa94490a0a 40 * Although routines that change the period maintain the duty cycle
gokmenascioglu 0:a8fa94490a0a 41 * for its PWM, all other PWMs will require their duty cycle to be
gokmenascioglu 0:a8fa94490a0a 42 * refreshed.
gokmenascioglu 0:a8fa94490a0a 43 */
gokmenascioglu 0:a8fa94490a0a 44 class PwmOut : public Base {
gokmenascioglu 0:a8fa94490a0a 45
gokmenascioglu 0:a8fa94490a0a 46 public:
gokmenascioglu 0:a8fa94490a0a 47
gokmenascioglu 0:a8fa94490a0a 48 /* Constructor: PwmOut
gokmenascioglu 0:a8fa94490a0a 49 * Create a PwmOut connected to the specified pin
gokmenascioglu 0:a8fa94490a0a 50 *
gokmenascioglu 0:a8fa94490a0a 51 * Variables:
gokmenascioglu 0:a8fa94490a0a 52 * pin - PwmOut pin to connect to
gokmenascioglu 0:a8fa94490a0a 53 */
gokmenascioglu 0:a8fa94490a0a 54 PwmOut(PinName pin, const char *name = NULL);
gokmenascioglu 0:a8fa94490a0a 55
gokmenascioglu 0:a8fa94490a0a 56 /* Function: write
gokmenascioglu 0:a8fa94490a0a 57 * Set the ouput duty-cycle, specified as a percentage (float)
gokmenascioglu 0:a8fa94490a0a 58 *
gokmenascioglu 0:a8fa94490a0a 59 * Variables:
gokmenascioglu 0:a8fa94490a0a 60 * value - A floating-point value representing the output duty-cycle,
gokmenascioglu 0:a8fa94490a0a 61 * specified as a percentage. The value should lie between
gokmenascioglu 0:a8fa94490a0a 62 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
gokmenascioglu 0:a8fa94490a0a 63 * Values outside this range will be saturated to 0.0f or 1.0f.
gokmenascioglu 0:a8fa94490a0a 64 */
gokmenascioglu 0:a8fa94490a0a 65 void write(float value);
gokmenascioglu 0:a8fa94490a0a 66
gokmenascioglu 0:a8fa94490a0a 67 /* Function: read
gokmenascioglu 0:a8fa94490a0a 68 * Return the current output duty-cycle setting, measured as a percentage (float)
gokmenascioglu 0:a8fa94490a0a 69 *
gokmenascioglu 0:a8fa94490a0a 70 * Variables:
gokmenascioglu 0:a8fa94490a0a 71 * returns - A floating-point value representing the current duty-cycle being output on the pin,
gokmenascioglu 0:a8fa94490a0a 72 * measured as a percentage. The returned value will lie between
gokmenascioglu 0:a8fa94490a0a 73 * 0.0f (representing on 0%) and 1.0f (representing on 100%).
gokmenascioglu 0:a8fa94490a0a 74 *
gokmenascioglu 0:a8fa94490a0a 75 * Note:
gokmenascioglu 0:a8fa94490a0a 76 * This value may not match exactly the value set by a previous <write>.
gokmenascioglu 0:a8fa94490a0a 77 */
gokmenascioglu 0:a8fa94490a0a 78 float read();
gokmenascioglu 0:a8fa94490a0a 79
gokmenascioglu 0:a8fa94490a0a 80 /* Function: period
gokmenascioglu 0:a8fa94490a0a 81 * Set the PWM period, specified in seconds (float), keeping the
gokmenascioglu 0:a8fa94490a0a 82 * duty cycle the same.
gokmenascioglu 0:a8fa94490a0a 83 *
gokmenascioglu 0:a8fa94490a0a 84 * Note:
gokmenascioglu 0:a8fa94490a0a 85 * The resolution is currently in microseconds; periods smaller than this
gokmenascioglu 0:a8fa94490a0a 86 * will be set to zero.
gokmenascioglu 0:a8fa94490a0a 87 */
gokmenascioglu 0:a8fa94490a0a 88 void period(float seconds);
gokmenascioglu 0:a8fa94490a0a 89
gokmenascioglu 0:a8fa94490a0a 90 /* Function: period_ms
gokmenascioglu 0:a8fa94490a0a 91 * Set the PWM period, specified in milli-seconds (int), keeping the
gokmenascioglu 0:a8fa94490a0a 92 * duty cycle the same.
gokmenascioglu 0:a8fa94490a0a 93 */
gokmenascioglu 0:a8fa94490a0a 94 void period_ms(int ms);
gokmenascioglu 0:a8fa94490a0a 95
gokmenascioglu 0:a8fa94490a0a 96 /* Function: period_us
gokmenascioglu 0:a8fa94490a0a 97 * Set the PWM period, specified in micro-seconds (int), keeping the
gokmenascioglu 0:a8fa94490a0a 98 * duty cycle the same.
gokmenascioglu 0:a8fa94490a0a 99 */
gokmenascioglu 0:a8fa94490a0a 100 void period_us(int us);
gokmenascioglu 0:a8fa94490a0a 101
gokmenascioglu 0:a8fa94490a0a 102 /* Function: pulsewidth
gokmenascioglu 0:a8fa94490a0a 103 * Set the PWM pulsewidth, specified in seconds (float), keeping the
gokmenascioglu 0:a8fa94490a0a 104 * period the same.
gokmenascioglu 0:a8fa94490a0a 105 */
gokmenascioglu 0:a8fa94490a0a 106 void pulsewidth(float seconds);
gokmenascioglu 0:a8fa94490a0a 107
gokmenascioglu 0:a8fa94490a0a 108 /* Function: pulsewidth_ms
gokmenascioglu 0:a8fa94490a0a 109 * Set the PWM pulsewidth, specified in milli-seconds (int), keeping
gokmenascioglu 0:a8fa94490a0a 110 * the period the same.
gokmenascioglu 0:a8fa94490a0a 111 */
gokmenascioglu 0:a8fa94490a0a 112 void pulsewidth_ms(int ms);
gokmenascioglu 0:a8fa94490a0a 113
gokmenascioglu 0:a8fa94490a0a 114 /* Function: pulsewidth_us
gokmenascioglu 0:a8fa94490a0a 115 * Set the PWM pulsewidth, specified in micro-seconds (int), keeping
gokmenascioglu 0:a8fa94490a0a 116 * the period the same.
gokmenascioglu 0:a8fa94490a0a 117 */
gokmenascioglu 0:a8fa94490a0a 118 void pulsewidth_us(int us);
gokmenascioglu 0:a8fa94490a0a 119
gokmenascioglu 0:a8fa94490a0a 120 #ifdef MBED_OPERATORS
gokmenascioglu 0:a8fa94490a0a 121 /* Function: operator=
gokmenascioglu 0:a8fa94490a0a 122 * A operator shorthand for <write()>
gokmenascioglu 0:a8fa94490a0a 123 */
gokmenascioglu 0:a8fa94490a0a 124 PwmOut& operator= (float value);
gokmenascioglu 0:a8fa94490a0a 125 PwmOut& operator= (PwmOut& rhs);
gokmenascioglu 0:a8fa94490a0a 126
gokmenascioglu 0:a8fa94490a0a 127 /* Function: operator float()
gokmenascioglu 0:a8fa94490a0a 128 * An operator shorthand for <read()>
gokmenascioglu 0:a8fa94490a0a 129 */
gokmenascioglu 0:a8fa94490a0a 130 operator float();
gokmenascioglu 0:a8fa94490a0a 131 #endif
gokmenascioglu 0:a8fa94490a0a 132
gokmenascioglu 0:a8fa94490a0a 133 #ifdef MBED_RPC
gokmenascioglu 0:a8fa94490a0a 134 virtual const struct rpc_method *get_rpc_methods();
gokmenascioglu 0:a8fa94490a0a 135 static struct rpc_class *get_rpc_class();
gokmenascioglu 0:a8fa94490a0a 136 #endif
gokmenascioglu 0:a8fa94490a0a 137
gokmenascioglu 0:a8fa94490a0a 138 protected:
gokmenascioglu 0:a8fa94490a0a 139
gokmenascioglu 0:a8fa94490a0a 140 PWMName _pwm;
gokmenascioglu 0:a8fa94490a0a 141
gokmenascioglu 0:a8fa94490a0a 142 };
gokmenascioglu 0:a8fa94490a0a 143
gokmenascioglu 0:a8fa94490a0a 144 } // namespace mbed
gokmenascioglu 0:a8fa94490a0a 145
gokmenascioglu 0:a8fa94490a0a 146 #endif
gokmenascioglu 0:a8fa94490a0a 147
gokmenascioglu 0:a8fa94490a0a 148 #endif