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PwmOut Class Reference
Public Member Functions | Protected Member Functions

PwmOut Class Reference
[Drivers]

A pulse-width modulation digital output. More...

#include <PwmOut.h>

Public Member Functions

 PwmOut (PinName pin)
 Create a PwmOut connected to the specified pin.
void write (float value)
 Set the ouput duty-cycle, specified as a percentage (float)
float read ()
 Return the current output duty-cycle setting, measured as a percentage (float)
void period (float seconds)
 Set the PWM period, specified in seconds (float), keeping the duty cycle the same.
void period_ms (int ms)
 Set the PWM period, specified in milli-seconds (int), keeping the duty cycle the same.
void period_us (int us)
 Set the PWM period, specified in micro-seconds (int), keeping the duty cycle the same.
void pulsewidth (float seconds)
 Set the PWM pulsewidth, specified in seconds (float), keeping the period the same.
void pulsewidth_ms (int ms)
 Set the PWM pulsewidth, specified in milli-seconds (int), keeping the period the same.
void pulsewidth_us (int us)
 Set the PWM pulsewidth, specified in micro-seconds (int), keeping the period the same.
PwmOut & operator= (float value)
 A operator shorthand for write()
PwmOut & operator= (PwmOut &rhs)
 A operator shorthand for write()
 operator float ()
 An operator shorthand for read()

Protected Member Functions

void lock_deep_sleep ()
 Lock deep sleep only if it is not yet locked.
void unlock_deep_sleep ()
 Unlock deep sleep in case it is locked.

Detailed Description

A pulse-width modulation digital output.

Note:
Synchronization level: Interrupt safe

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;
         }
     }
 }

Definition at line 52 of file PwmOut.h.

Constructor & Destructor Documentation

PwmOut ( PinName  pin )

Create a PwmOut connected to the specified pin.

Parameters:
pinPwmOut pin to connect to

Definition at line 60 of file PwmOut.h.

Member Function Documentation

void lock_deep_sleep (  ) [protected]

Lock deep sleep only if it is not yet locked.

Definition at line 189 of file PwmOut.h.

operator float (  )

An operator shorthand for read()

See also:
PwmOut::read()

Definition at line 182 of file PwmOut.h.

PwmOut& operator= ( float  value )

A operator shorthand for write()

See also:
PwmOut::write()

Definition at line 164 of file PwmOut.h.

PwmOut& operator= ( PwmOut &  rhs )

A operator shorthand for write()

See also:
PwmOut::write()

Definition at line 173 of file PwmOut.h.

void period ( float  seconds )

Set the PWM period, specified in seconds (float), keeping the duty cycle the same.

Parameters:
secondsChange the period of a PWM signal in seconds (float) without modifying the duty cycle
Note:
The resolution is currently in microseconds; periods smaller than this will be set to zero.

Definition at line 110 of file PwmOut.h.

void period_ms ( int  ms )

Set the PWM period, specified in milli-seconds (int), keeping the duty cycle the same.

Parameters:
msChange the period of a PWM signal in milli-seconds without modifying the duty cycle

Definition at line 119 of file PwmOut.h.

void period_us ( int  us )

Set the PWM period, specified in micro-seconds (int), keeping the duty cycle the same.

Parameters:
usChange the period of a PWM signal in micro-seconds without modifying the duty cycle

Definition at line 128 of file PwmOut.h.

void pulsewidth ( float  seconds )

Set the PWM pulsewidth, specified in seconds (float), keeping the period the same.

Parameters:
secondsChange the pulse width of a PWM signal specified in seconds (float)

Definition at line 137 of file PwmOut.h.

void pulsewidth_ms ( int  ms )

Set the PWM pulsewidth, specified in milli-seconds (int), keeping the period the same.

Parameters:
msChange the pulse width of a PWM signal specified in milli-seconds

Definition at line 146 of file PwmOut.h.

void pulsewidth_us ( int  us )

Set the PWM pulsewidth, specified in micro-seconds (int), keeping the period the same.

Parameters:
usChange the pulse width of a PWM signal specified in micro-seconds

Definition at line 155 of file PwmOut.h.

float read ( void   )

Return the current output duty-cycle setting, measured as a percentage (float)

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().

Definition at line 96 of file PwmOut.h.

void unlock_deep_sleep (  ) [protected]

Unlock deep sleep in case it is locked.

Definition at line 197 of file PwmOut.h.

void write ( float  value )

Set the ouput duty-cycle, specified as a percentage (float)

Parameters:
valueA 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.

Definition at line 79 of file PwmOut.h.

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