Ben Katz / FastPWM3

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Dependents:   qonly_controller foc-ed_in_the_bot_compact foc-ed_in_the_bot_compact CurrentModeSine ... more

Fork of FastPWM by Erik -

Files at this revision

API Documentation at this revision

Revision 3:3094d3806cfc, committed 2012-07-25

Comitter:
Sissors
Date:
Wed Jul 25 07:14:39 2012 +0000
Parent:
2:4b8de6ae5885
Child:
4:a7b9f778c4b4
Commit message:
Fixed clk_sel, latch registers and constant duty when changing period

Changed in this revision

FastPWM.cpp Show annotated file Show diff for this revision Revisions of this file
FastPWM.h Show annotated file Show diff for this revision Revisions of this file 
--- a/FastPWM.cpp	Thu Jul 12 19:26:43 2012 +0000
+++ b/FastPWM.cpp	Wed Jul 25 07:14:39 2012 +0000
@@ -1,20 +1,35 @@
 #include "FastPWM.h"
 
 FastPWM::FastPWM(PinName pin) : PWMObject(pin){
+    //Set clock source
+    LPC_SC->PCLKSEL0|=1<<12;
+    
     _duty=0;
     _period=0.02;
-    if (pin==p26||pin==LED1)
+    if (pin==p26||pin==LED1) {
+        PWMUnit=1;
         MR=&LPC_PWM1->MR1;
-    else if (pin==p25||pin==LED2)
+        }
+    else if (pin==p25||pin==LED2){
+        PWMUnit=2;
         MR=&LPC_PWM1->MR2;
-    else if (pin==p24||pin==LED3)
+        }
+    else if (pin==p24||pin==LED3){
+        PWMUnit=3;
         MR=&LPC_PWM1->MR3;
-    else if (pin==p23||pin==LED4)
+        }
+    else if (pin==p23||pin==LED4){
+        PWMUnit=4;
         MR=&LPC_PWM1->MR4;
-    else if (pin==p22)
+        }
+    else if (pin==p22){
+        PWMUnit=5;
         MR=&LPC_PWM1->MR5;
-    else if (pin==p21)
+        }
+    else if (pin==p21){
+        PWMUnit=6;
         MR=&LPC_PWM1->MR6;
+        }
     else
         error("No hardware PWM pin\n\r");
     
@@ -23,8 +38,9 @@
 
 void FastPWM::period(double seconds) {
     LPC_PWM1->MR0 = (unsigned int) (seconds * (double)F_CLK);
-    pulsewidth(_duty*seconds);
+    LPC_PWM1->LER |= 1;
     _period = seconds;
+    pulsewidth(_duty*_period);
 }
 
 void FastPWM::period_ms(int ms) {
@@ -41,6 +57,8 @@
 
 void FastPWM::pulsewidth(double seconds) {
     *MR=(unsigned int) (seconds * (double)F_CLK);
+    LPC_PWM1->LER |= 1<<PWMUnit;
+    _duty=seconds/_period;
 }
 
 void FastPWM::pulsewidth_ms(int ms) {

--- a/FastPWM.h	Thu Jul 12 19:26:43 2012 +0000
+++ b/FastPWM.h	Wed Jul 25 07:14:39 2012 +0000
@@ -115,6 +115,7 @@
     PwmOut PWMObject;
     double _duty;
     double _period;
+    unsigned int PWMUnit;
     
     __IO uint32_t *MR;