Geofrey Marcel / FastPWM

Fork of Erik Olieman's FastPWM library created to add the targets I need.

Fork of FastPWM by Erik -

FastPWM_common.cpp@6:0f57969697b6, 2014-03-17 (annotated)

Committer:
Sissors
Date:
Mon Mar 17 22:12:58 2014 +0000
Revision:
6:0f57969697b6
Parent:
4:a7b9f778c4b4
Child:
12:4600daab8a83
Changing period now keeps pulsewidth the same instead of duty cycle

;

; KLXX now doesn't give glitches when changing pulsewidth

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Sissors 4:a7b9f778c4b4 1 #include "FastPWM.h"
Sissors 4:a7b9f778c4b4 2
Sissors 4:a7b9f778c4b4 3 FastPWM::FastPWM(PinName pin, int prescaler) : PwmOut(pin) {
Sissors 4:a7b9f778c4b4 4 initFastPWM();
Sissors 4:a7b9f778c4b4 5 this->prescaler(prescaler);
Sissors 4:a7b9f778c4b4 6
Sissors 4:a7b9f778c4b4 7 //Set duty cycle on 0%, period on 20ms
Sissors 4:a7b9f778c4b4 8 period(0.02);
Sissors 6:0f57969697b6 9 write(0);
Sissors 4:a7b9f778c4b4 10
Sissors 4:a7b9f778c4b4 11
Sissors 4:a7b9f778c4b4 12 }
Sissors 4:a7b9f778c4b4 13
Sissors 4:a7b9f778c4b4 14 void FastPWM::period(double seconds) {
Sissors 4:a7b9f778c4b4 15 if (dynamicPrescaler)
Sissors 4:a7b9f778c4b4 16 calcPrescaler((uint64_t)(seconds * (double) SystemCoreClock));
Sissors 4:a7b9f778c4b4 17
Sissors 4:a7b9f778c4b4 18 period_ticks(seconds * dticks + 0.5);
Sissors 4:a7b9f778c4b4 19 }
Sissors 4:a7b9f778c4b4 20
Sissors 4:a7b9f778c4b4 21 void FastPWM::period_ms(int ms) {
Sissors 4:a7b9f778c4b4 22 if (dynamicPrescaler)
Sissors 4:a7b9f778c4b4 23 calcPrescaler(ms * (SystemCoreClock / 1000));
Sissors 4:a7b9f778c4b4 24
Sissors 4:a7b9f778c4b4 25 period_ticks(ms * iticks_ms);
Sissors 4:a7b9f778c4b4 26 }
Sissors 4:a7b9f778c4b4 27
Sissors 4:a7b9f778c4b4 28 void FastPWM::period_us(int us) {
Sissors 4:a7b9f778c4b4 29 if (dynamicPrescaler)
Sissors 4:a7b9f778c4b4 30 calcPrescaler(us * (SystemCoreClock / 1000000));
Sissors 4:a7b9f778c4b4 31
Sissors 4:a7b9f778c4b4 32 period_ticks(us * iticks_us);
Sissors 4:a7b9f778c4b4 33 }
Sissors 4:a7b9f778c4b4 34
Sissors 4:a7b9f778c4b4 35 void FastPWM::period_us(double us) {
Sissors 4:a7b9f778c4b4 36 if (dynamicPrescaler)
Sissors 4:a7b9f778c4b4 37 calcPrescaler((uint64_t)(us * (double)(SystemCoreClock / 1000000)));
Sissors 4:a7b9f778c4b4 38
Sissors 4:a7b9f778c4b4 39 period_ticks(us * dticks_us + 0.5);
Sissors 4:a7b9f778c4b4 40 }
Sissors 4:a7b9f778c4b4 41
Sissors 4:a7b9f778c4b4 42 void FastPWM::pulsewidth(double seconds) {
Sissors 4:a7b9f778c4b4 43 pulsewidth_ticks(seconds * dticks + 0.5);
Sissors 4:a7b9f778c4b4 44 }
Sissors 4:a7b9f778c4b4 45
Sissors 4:a7b9f778c4b4 46 void FastPWM::pulsewidth_ms(int ms) {
Sissors 4:a7b9f778c4b4 47 pulsewidth_ticks(ms * iticks_ms);
Sissors 4:a7b9f778c4b4 48 }
Sissors 4:a7b9f778c4b4 49
Sissors 4:a7b9f778c4b4 50 void FastPWM::pulsewidth_us(int us) {
Sissors 4:a7b9f778c4b4 51 pulsewidth_ticks(us * iticks_us);
Sissors 4:a7b9f778c4b4 52 }
Sissors 4:a7b9f778c4b4 53
Sissors 4:a7b9f778c4b4 54 void FastPWM::pulsewidth_us(double us) {
Sissors 4:a7b9f778c4b4 55 pulsewidth_ticks(us * dticks_us + 0.5);
Sissors 4:a7b9f778c4b4 56 }
Sissors 4:a7b9f778c4b4 57
Sissors 4:a7b9f778c4b4 58 void FastPWM::write(double duty) {
Sissors 4:a7b9f778c4b4 59 _duty=duty;
Sissors 4:a7b9f778c4b4 60 pulsewidth_ticks(duty*getPeriod());
Sissors 4:a7b9f778c4b4 61 }
Sissors 4:a7b9f778c4b4 62
Sissors 4:a7b9f778c4b4 63 double FastPWM::read( void ) {
Sissors 4:a7b9f778c4b4 64 return _duty;
Sissors 4:a7b9f778c4b4 65 }
Sissors 4:a7b9f778c4b4 66
Sissors 4:a7b9f778c4b4 67 FastPWM & FastPWM::operator= (double value) {
Sissors 4:a7b9f778c4b4 68 write(value);
Sissors 4:a7b9f778c4b4 69 return(*this);
Sissors 4:a7b9f778c4b4 70 }
Sissors 4:a7b9f778c4b4 71
Sissors 4:a7b9f778c4b4 72 FastPWM::operator double() {
Sissors 4:a7b9f778c4b4 73 return _duty;
Sissors 4:a7b9f778c4b4 74 }
Sissors 4:a7b9f778c4b4 75
Sissors 4:a7b9f778c4b4 76 int FastPWM::prescaler(int value) {
Sissors 4:a7b9f778c4b4 77 int retval;
Sissors 4:a7b9f778c4b4 78 if (value == -1) {
Sissors 4:a7b9f778c4b4 79 dynamicPrescaler = true;
Sissors 4:a7b9f778c4b4 80 value = 0;
Sissors 4:a7b9f778c4b4 81 }
Sissors 4:a7b9f778c4b4 82 else
Sissors 4:a7b9f778c4b4 83 dynamicPrescaler = false;
Sissors 4:a7b9f778c4b4 84
Sissors 4:a7b9f778c4b4 85 retval = setPrescaler(value);
Sissors 4:a7b9f778c4b4 86 updateTicks(retval);
Sissors 4:a7b9f778c4b4 87 return retval;
Sissors 4:a7b9f778c4b4 88 }
Sissors 4:a7b9f778c4b4 89
Sissors 4:a7b9f778c4b4 90 void FastPWM::updateTicks( uint32_t prescaler ) {
Sissors 4:a7b9f778c4b4 91 dticks = SystemCoreClock / (double)prescaler;
Sissors 4:a7b9f778c4b4 92 dticks_us = SystemCoreClock / (double)prescaler / 1000000.0f;
Sissors 4:a7b9f778c4b4 93 iticks_ms = SystemCoreClock / prescaler / 1000;
Sissors 4:a7b9f778c4b4 94 iticks_us = SystemCoreClock / prescaler / 1000000;
Sissors 4:a7b9f778c4b4 95 }
Sissors 4:a7b9f778c4b4 96
Sissors 4:a7b9f778c4b4 97 int FastPWM::calcPrescaler(uint64_t clocks) {
Sissors 4:a7b9f778c4b4 98 uint32_t scale = (clocks >> bits) + 1;
Sissors 4:a7b9f778c4b4 99 uint32_t retval = setPrescaler(scale);
Sissors 4:a7b9f778c4b4 100 updateTicks(retval);
Sissors 4:a7b9f778c4b4 101 return retval;
Sissors 4:a7b9f778c4b4 102 }