V D / Mbed 2 deprecated di19sept2017

Potmeter FastPWM.h

Dependencies:   mbed

FastPWM_common.cpp@0:16be67f4d9ac, 2017-09-19 (annotated)

Committer:
vd
Date:
Tue Sep 19 16:52:01 2017 +0000
Revision:
0:16be67f4d9ac
Potmeter FastPWM.h

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vd 0:16be67f4d9ac 1 #include "FastPWM.h"
vd 0:16be67f4d9ac 2
vd 0:16be67f4d9ac 3 FastPWM::FastPWM(PinName pin, int prescaler) : PwmOut(pin) {
vd 0:16be67f4d9ac 4 fast_obj = NULL;
vd 0:16be67f4d9ac 5 initFastPWM();
vd 0:16be67f4d9ac 6 this->prescaler(prescaler);
vd 0:16be67f4d9ac 7
vd 0:16be67f4d9ac 8 //Set duty cycle on 0%, period on 20ms
vd 0:16be67f4d9ac 9 period(0.02);
vd 0:16be67f4d9ac 10 write(0);
vd 0:16be67f4d9ac 11
vd 0:16be67f4d9ac 12
vd 0:16be67f4d9ac 13 }
vd 0:16be67f4d9ac 14
vd 0:16be67f4d9ac 15 FastPWM::~FastPWM( void ) {
vd 0:16be67f4d9ac 16 if (fast_obj != NULL)
vd 0:16be67f4d9ac 17 delete(fast_obj);
vd 0:16be67f4d9ac 18 }
vd 0:16be67f4d9ac 19
vd 0:16be67f4d9ac 20 void FastPWM::period(double seconds) {
vd 0:16be67f4d9ac 21 if (dynamicPrescaler)
vd 0:16be67f4d9ac 22 calcPrescaler((uint64_t)(seconds * (double) SystemCoreClock));
vd 0:16be67f4d9ac 23
vd 0:16be67f4d9ac 24 period_ticks(seconds * dticks + 0.5);
vd 0:16be67f4d9ac 25 }
vd 0:16be67f4d9ac 26
vd 0:16be67f4d9ac 27 void FastPWM::period_ms(int ms) {
vd 0:16be67f4d9ac 28 if (dynamicPrescaler)
vd 0:16be67f4d9ac 29 calcPrescaler(ms * (SystemCoreClock / 1000));
vd 0:16be67f4d9ac 30
vd 0:16be67f4d9ac 31 period_ticks(ms * iticks_ms);
vd 0:16be67f4d9ac 32 }
vd 0:16be67f4d9ac 33
vd 0:16be67f4d9ac 34 void FastPWM::period_us(int us) {
vd 0:16be67f4d9ac 35 if (dynamicPrescaler)
vd 0:16be67f4d9ac 36 calcPrescaler(us * (SystemCoreClock / 1000000));
vd 0:16be67f4d9ac 37
vd 0:16be67f4d9ac 38 period_ticks(us * iticks_us);
vd 0:16be67f4d9ac 39 }
vd 0:16be67f4d9ac 40
vd 0:16be67f4d9ac 41 void FastPWM::period_us(double us) {
vd 0:16be67f4d9ac 42 if (dynamicPrescaler)
vd 0:16be67f4d9ac 43 calcPrescaler((uint64_t)(us * (double)(SystemCoreClock / 1000000)));
vd 0:16be67f4d9ac 44
vd 0:16be67f4d9ac 45 period_ticks(us * dticks_us + 0.5);
vd 0:16be67f4d9ac 46 }
vd 0:16be67f4d9ac 47
vd 0:16be67f4d9ac 48 void FastPWM::pulsewidth(double seconds) {
vd 0:16be67f4d9ac 49 pulsewidth_ticks(seconds * dticks + 0.5);
vd 0:16be67f4d9ac 50 }
vd 0:16be67f4d9ac 51
vd 0:16be67f4d9ac 52 void FastPWM::pulsewidth_ms(int ms) {
vd 0:16be67f4d9ac 53 pulsewidth_ticks(ms * iticks_ms);
vd 0:16be67f4d9ac 54 }
vd 0:16be67f4d9ac 55
vd 0:16be67f4d9ac 56 void FastPWM::pulsewidth_us(int us) {
vd 0:16be67f4d9ac 57 pulsewidth_ticks(us * iticks_us);
vd 0:16be67f4d9ac 58 }
vd 0:16be67f4d9ac 59
vd 0:16be67f4d9ac 60 void FastPWM::pulsewidth_us(double us) {
vd 0:16be67f4d9ac 61 pulsewidth_ticks(us * dticks_us + 0.5);
vd 0:16be67f4d9ac 62 }
vd 0:16be67f4d9ac 63
vd 0:16be67f4d9ac 64 void FastPWM::write(double duty) {
vd 0:16be67f4d9ac 65 _duty=duty;
vd 0:16be67f4d9ac 66 pulsewidth_ticks(duty*getPeriod());
vd 0:16be67f4d9ac 67 }
vd 0:16be67f4d9ac 68
vd 0:16be67f4d9ac 69 double FastPWM::read( void ) {
vd 0:16be67f4d9ac 70 return _duty;
vd 0:16be67f4d9ac 71 }
vd 0:16be67f4d9ac 72
vd 0:16be67f4d9ac 73 FastPWM & FastPWM::operator= (double value) {
vd 0:16be67f4d9ac 74 write(value);
vd 0:16be67f4d9ac 75 return(*this);
vd 0:16be67f4d9ac 76 }
vd 0:16be67f4d9ac 77
vd 0:16be67f4d9ac 78 FastPWM::operator double() {
vd 0:16be67f4d9ac 79 return _duty;
vd 0:16be67f4d9ac 80 }
vd 0:16be67f4d9ac 81
vd 0:16be67f4d9ac 82 int FastPWM::prescaler(int value) {
vd 0:16be67f4d9ac 83 int retval;
vd 0:16be67f4d9ac 84 if (value == -1) {
vd 0:16be67f4d9ac 85 dynamicPrescaler = true;
vd 0:16be67f4d9ac 86 value = 0;
vd 0:16be67f4d9ac 87 }
vd 0:16be67f4d9ac 88 else
vd 0:16be67f4d9ac 89 dynamicPrescaler = false;
vd 0:16be67f4d9ac 90
vd 0:16be67f4d9ac 91 retval = setPrescaler(value);
vd 0:16be67f4d9ac 92 updateTicks(retval);
vd 0:16be67f4d9ac 93 return retval;
vd 0:16be67f4d9ac 94 }
vd 0:16be67f4d9ac 95
vd 0:16be67f4d9ac 96 void FastPWM::updateTicks( uint32_t prescaler ) {
vd 0:16be67f4d9ac 97 dticks = SystemCoreClock / (double)prescaler;
vd 0:16be67f4d9ac 98 dticks_us = dticks / 1000000.0f;
vd 0:16be67f4d9ac 99 iticks_us = (int)(dticks_us + 0.5);
vd 0:16be67f4d9ac 100 iticks_ms = (int)(dticks_us * 1000.0 + 0.5);
vd 0:16be67f4d9ac 101 }
vd 0:16be67f4d9ac 102
vd 0:16be67f4d9ac 103 int FastPWM::calcPrescaler(uint64_t clocks) {
vd 0:16be67f4d9ac 104 uint32_t scale = (clocks >> bits) + 1;
vd 0:16be67f4d9ac 105 uint32_t retval = setPrescaler(scale);
vd 0:16be67f4d9ac 106 updateTicks(retval);
vd 0:16be67f4d9ac 107 return retval;
vd 0:16be67f4d9ac 108 }