Test code for Grove Node BLE
Dependencies: BLE_API nRF51822
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PwmOut Class Reference
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() | |
operator float () | |
An operator shorthand for read() |
Detailed Description
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:
- 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.
Definition at line 53 of file PwmOut.h.
Constructor & Destructor Documentation
PwmOut | ( | PinName | pin ) |
Member Function Documentation
PwmOut& operator= | ( | float | value ) |
void period | ( | float | seconds ) |
void period_ms | ( | int | ms ) |
void period_us | ( | int | us ) |
void pulsewidth | ( | float | seconds ) |
void pulsewidth_ms | ( | int | ms ) |
void pulsewidth_us | ( | int | us ) |
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>.
void write | ( | float | value ) |
Set the ouput duty-cycle, specified as a percentage (float)
- Parameters:
-
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.
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