The PWM output by software. Can be output to any pin. It can be used to replace the Pwmout.

Dependents:   RC_Servo

Fork of SoftPWM by syouichi imamori

Files at this revision

API Documentation at this revision

Comitter:
haarkon
Date:
Tue Jun 05 12:21:14 2018 +0000
Parent:
0:7918ce37626c
Commit message:
Lightly modified to correct multiple dumb warning

Changed in this revision

SoftPWM.cpp Show annotated file Show diff for this revision Revisions of this file
SoftPWM.h Show annotated file Show diff for this revision Revisions of this file
diff -r 7918ce37626c -r 9aba3dc9cd97 SoftPWM.cpp
--- a/SoftPWM.cpp	Wed Oct 23 19:31:14 2013 +0000
+++ b/SoftPWM.cpp	Tue Jun 05 12:21:14 2018 +0000
@@ -14,14 +14,14 @@
     start(); 
 }
 
-float SoftPWM::read()
+double SoftPWM::read()
 {
     if ( width <= 0.0 ) return 0.0;
     if ( width > 1.0 )  return 1.0;
     return width / interval;    
 }
 
-void SoftPWM::write(float duty)
+void SoftPWM::write(double duty)
 {
     width = interval * duty;
     if ( duty <= 0.0 ) width =  0.0;
@@ -30,7 +30,7 @@
 
 void SoftPWM::start()
 {
-    _ticker.attach(this,&SoftPWM::TickerInterrapt,interval);
+    _ticker.attach(callback(this,&SoftPWM::TickerInterrapt),interval);
 }
 
 void SoftPWM::stop()
@@ -43,7 +43,7 @@
     wait(width);
 }
 
-void SoftPWM::period(float _period)
+void SoftPWM::period(double _period)
 {
     interval = _period;
     start();
@@ -51,17 +51,17 @@
 
 void SoftPWM::period_ms(int _period)
 {
-    period((float)_period / 1000);
+    period((double)_period / 1000);
     start();
 }
 
 void SoftPWM::period_us(int _period)
 {
-    period((float)_period / 1000000);
+    period((double)_period / 1000000);
     start();
 }
 
-void SoftPWM::pulsewidth(float _width)
+void SoftPWM::pulsewidth(double _width)
 {
     width = _width;
    if ( width < 0.0 ) width = 0.0;
@@ -69,18 +69,18 @@
 
 void SoftPWM::pulsewidth_ms(int _width)
 {
-     pulsewidth((float)_width / 1000);
+     pulsewidth((double)_width / 1000);
 }
 
 void SoftPWM::pulsewidth_us(int _width)
 {
-    pulsewidth((float)_width / 1000000);
+    pulsewidth((double)_width / 1000000);
 }
 
 void SoftPWM::TickerInterrapt()
 { 
     if ( width <= 0 ) return;
-    _timeout.attach(this,&SoftPWM::end,width);
+    _timeout.attach(callback(this,&SoftPWM::end),width);
     if ( positive )
         pulse = 1;
     else
diff -r 7918ce37626c -r 9aba3dc9cd97 SoftPWM.h
--- a/SoftPWM.h	Wed Oct 23 19:31:14 2013 +0000
+++ b/SoftPWM.h	Tue Jun 05 12:21:14 2018 +0000
@@ -14,29 +14,29 @@
     DigitalOut pulse;
     bool positive;
     void TickerInterrapt();
-    float width;
-    float interval;
+    double width;
+    double interval;
 public:
     SoftPWM(PinName,bool mode=true); 
 //    void attach_us(int);
     void start();
-    void write(float);
-    float read();
-    void pulsewidth(float);
+    void write(double);
+    double read();
+    void pulsewidth(double);
     void pulsewidth_ms(int);
     void pulsewidth_us(int);
-    void period(float);
+    void period(double);
     void period_ms(int);
     void period_us(int);
     void stop();
-    operator float()  { 
+    operator double()  { 
         if ( width <= 0.0 ) return 0.0;
         if ( width > 1.0 )  return 1.0;
         return width / interval;
     }
-    SoftPWM& operator=(float duty)  {
+    SoftPWM& operator=(double duty)  {
         width = interval * duty;
-        if ( duty <= 0.0 ) width =  0.0;
+        if ( duty <= 0.0 ) width =  0.0f;
         if ( duty > 1.0 )  width =  interval;
         return *this;
     }