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Diff: mbed/PwmOut.h
- Revision:
- 0:ad97421fb1fb
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed/PwmOut.h Wed Apr 13 22:04:54 2016 +0000 @@ -0,0 +1,148 @@ +/* mbed Microcontroller Library - PwmOut + * Copyright (c) 2007-2011 ARM Limited. All rights reserved. + */ + +#ifndef MBED_PWMOUT_H +#define MBED_PWMOUT_H + +#include "device.h" + +#if DEVICE_PWMOUT + +#include "platform.h" +#include "PinNames.h" +#include "PeripheralNames.h" +#include "Base.h" + +namespace mbed { + +/* Class: PwmOut + * A pulse-width modulation digital output + * + * Example + * > // Fade a led on. + * > #include "mbed.h" + * > + * > PwmOut led(LED1); + * > + * > int main() { + * > while(1) { + * > led = led + 0.01; + * > wait(0.2); + * > if(led == 1.0) { + * > led = 0; + * > } + * > } + * > } + * + * Note that on the LPC1768 and LPC2368, the PWMs all share the same + * period - if you change the period for one, you change it for all. + * Although routines that change the period maintain the duty cycle + * for its PWM, all other PWMs will require their duty cycle to be + * refreshed. + */ +class PwmOut : public Base { + +public: + + /* Constructor: PwmOut + * Create a PwmOut connected to the specified pin + * + * Variables: + * pin - PwmOut pin to connect to + */ + PwmOut(PinName pin, const char *name = NULL); + + /* Function: write + * Set the ouput duty-cycle, specified as a percentage (float) + * + * Variables: + * value - A floating-point value representing the output duty-cycle, + * specified as a percentage. The value should lie between + * 0.0f (representing on 0%) and 1.0f (representing on 100%). + * Values outside this range will be saturated to 0.0f or 1.0f. + */ + void write(float value); + + /* Function: read + * Return the current output duty-cycle setting, measured as a percentage (float) + * + * Variables: + * returns - A floating-point value representing the current duty-cycle being output on the pin, + * measured as a percentage. The returned value will lie between + * 0.0f (representing on 0%) and 1.0f (representing on 100%). + * + * Note: + * This value may not match exactly the value set by a previous <write>. + */ + float read(); + + /* Function: period + * Set the PWM period, specified in seconds (float), keeping the + * duty cycle the same. + * + * Note: + * The resolution is currently in microseconds; periods smaller than this + * will be set to zero. + */ + void period(float seconds); + + /* Function: period_ms + * Set the PWM period, specified in milli-seconds (int), keeping the + * duty cycle the same. + */ + void period_ms(int ms); + + /* Function: period_us + * Set the PWM period, specified in micro-seconds (int), keeping the + * duty cycle the same. + */ + void period_us(int us); + + /* Function: pulsewidth + * Set the PWM pulsewidth, specified in seconds (float), keeping the + * period the same. + */ + void pulsewidth(float seconds); + + /* Function: pulsewidth_ms + * Set the PWM pulsewidth, specified in milli-seconds (int), keeping + * the period the same. + */ + void pulsewidth_ms(int ms); + + /* Function: pulsewidth_us + * Set the PWM pulsewidth, specified in micro-seconds (int), keeping + * the period the same. + */ + void pulsewidth_us(int us); + +#ifdef MBED_OPERATORS + /* Function: operator= + * A operator shorthand for <write()> + */ + PwmOut& operator= (float value); + PwmOut& operator= (PwmOut& rhs); + + /* Function: operator float() + * An operator shorthand for <read()> + */ + operator float(); +#endif + +#ifdef MBED_RPC + virtual const struct rpc_method *get_rpc_methods(); + static struct rpc_class *get_rpc_class(); +#endif + +protected: + + PWMName _pwm; + +}; + +} // namespace mbed + +#endif + +#endif