Michael Ernst Peter / FastPWM

Fork of original FastPWM libary from Sissors.

Dependents:   PM2_Libary PM2_Libary

FastPWM_common.cpp@37:0ca2cf9a1437, 2022-03-21 (annotated)

Committer:
pmic
Date:
Mon Mar 21 13:31:01 2022 +0000
Revision:
37:0ca2cf9a1437
Parent:
36:1cc92cba9e04
Child:
38:b83caa1bcbc7
Added write fcn for float inputs in FastPWM.

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 12:4600daab8a83 4 fast_obj = NULL;
Sissors 4:a7b9f778c4b4 5 initFastPWM();
Sissors 4:a7b9f778c4b4 6 this->prescaler(prescaler);
Sissors 4:a7b9f778c4b4 7
Sissors 4:a7b9f778c4b4 8 //Set duty cycle on 0%, period on 20ms
Sissors 4:a7b9f778c4b4 9 period(0.02);
Sissors 6:0f57969697b6 10 write(0);
Sissors 4:a7b9f778c4b4 11
Sissors 4:a7b9f778c4b4 12
Sissors 4:a7b9f778c4b4 13 }
Sissors 4:a7b9f778c4b4 14
Sissors 12:4600daab8a83 15 FastPWM::~FastPWM( void ) {
Sissors 12:4600daab8a83 16 if (fast_obj != NULL)
blaze 35:d6c2b73d71f5 17 free(fast_obj);
Sissors 12:4600daab8a83 18 }
Sissors 12:4600daab8a83 19
Sissors 4:a7b9f778c4b4 20 void FastPWM::period(double seconds) {
Sissors 4:a7b9f778c4b4 21 if (dynamicPrescaler)
Sissors 4:a7b9f778c4b4 22 calcPrescaler((uint64_t)(seconds * (double) SystemCoreClock));
Sissors 4:a7b9f778c4b4 23
Sissors 4:a7b9f778c4b4 24 period_ticks(seconds * dticks + 0.5);
Sissors 4:a7b9f778c4b4 25 }
Sissors 4:a7b9f778c4b4 26
pmic 36:1cc92cba9e04 27 void FastPWM::period(float seconds) {
pmic 36:1cc92cba9e04 28 period( static_cast<double>(seconds) );
pmic 36:1cc92cba9e04 29 }
pmic 36:1cc92cba9e04 30
Sissors 4:a7b9f778c4b4 31 void FastPWM::period_ms(int ms) {
Sissors 4:a7b9f778c4b4 32 if (dynamicPrescaler)
Sissors 4:a7b9f778c4b4 33 calcPrescaler(ms * (SystemCoreClock / 1000));
Sissors 4:a7b9f778c4b4 34
Sissors 4:a7b9f778c4b4 35 period_ticks(ms * iticks_ms);
Sissors 4:a7b9f778c4b4 36 }
Sissors 4:a7b9f778c4b4 37
Sissors 4:a7b9f778c4b4 38 void FastPWM::period_us(int us) {
Sissors 4:a7b9f778c4b4 39 if (dynamicPrescaler)
Sissors 4:a7b9f778c4b4 40 calcPrescaler(us * (SystemCoreClock / 1000000));
Sissors 4:a7b9f778c4b4 41
Sissors 4:a7b9f778c4b4 42 period_ticks(us * iticks_us);
Sissors 4:a7b9f778c4b4 43 }
Sissors 4:a7b9f778c4b4 44
Sissors 4:a7b9f778c4b4 45 void FastPWM::period_us(double us) {
Sissors 4:a7b9f778c4b4 46 if (dynamicPrescaler)
Sissors 4:a7b9f778c4b4 47 calcPrescaler((uint64_t)(us * (double)(SystemCoreClock / 1000000)));
Sissors 4:a7b9f778c4b4 48
Sissors 4:a7b9f778c4b4 49 period_ticks(us * dticks_us + 0.5);
Sissors 4:a7b9f778c4b4 50 }
Sissors 4:a7b9f778c4b4 51
Sissors 4:a7b9f778c4b4 52 void FastPWM::pulsewidth(double seconds) {
Sissors 4:a7b9f778c4b4 53 pulsewidth_ticks(seconds * dticks + 0.5);
Sissors 4:a7b9f778c4b4 54 }
Sissors 4:a7b9f778c4b4 55
Sissors 4:a7b9f778c4b4 56 void FastPWM::pulsewidth_ms(int ms) {
Sissors 4:a7b9f778c4b4 57 pulsewidth_ticks(ms * iticks_ms);
Sissors 4:a7b9f778c4b4 58 }
Sissors 4:a7b9f778c4b4 59
Sissors 4:a7b9f778c4b4 60 void FastPWM::pulsewidth_us(int us) {
Sissors 4:a7b9f778c4b4 61 pulsewidth_ticks(us * iticks_us);
Sissors 4:a7b9f778c4b4 62 }
Sissors 4:a7b9f778c4b4 63
Sissors 4:a7b9f778c4b4 64 void FastPWM::pulsewidth_us(double us) {
Sissors 4:a7b9f778c4b4 65 pulsewidth_ticks(us * dticks_us + 0.5);
Sissors 4:a7b9f778c4b4 66 }
Sissors 4:a7b9f778c4b4 67
Sissors 4:a7b9f778c4b4 68 void FastPWM::write(double duty) {
Sissors 4:a7b9f778c4b4 69 _duty=duty;
Sissors 4:a7b9f778c4b4 70 pulsewidth_ticks(duty*getPeriod());
Sissors 4:a7b9f778c4b4 71 }
Sissors 4:a7b9f778c4b4 72
pmic 37:0ca2cf9a1437 73 void FastPWM::write(float duty) {
pmic 37:0ca2cf9a1437 74 write(static_cast<double>(duty));
pmic 37:0ca2cf9a1437 75 }
pmic 37:0ca2cf9a1437 76
Sissors 4:a7b9f778c4b4 77 double FastPWM::read( void ) {
Sissors 4:a7b9f778c4b4 78 return _duty;
Sissors 4:a7b9f778c4b4 79 }
Sissors 4:a7b9f778c4b4 80
Sissors 4:a7b9f778c4b4 81 FastPWM & FastPWM::operator= (double value) {
Sissors 4:a7b9f778c4b4 82 write(value);
Sissors 4:a7b9f778c4b4 83 return(*this);
Sissors 4:a7b9f778c4b4 84 }
Sissors 4:a7b9f778c4b4 85
Sissors 4:a7b9f778c4b4 86 FastPWM::operator double() {
Sissors 4:a7b9f778c4b4 87 return _duty;
Sissors 4:a7b9f778c4b4 88 }
Sissors 4:a7b9f778c4b4 89
Sissors 4:a7b9f778c4b4 90 int FastPWM::prescaler(int value) {
Sissors 4:a7b9f778c4b4 91 int retval;
Sissors 4:a7b9f778c4b4 92 if (value == -1) {
Sissors 4:a7b9f778c4b4 93 dynamicPrescaler = true;
Sissors 4:a7b9f778c4b4 94 value = 0;
Sissors 4:a7b9f778c4b4 95 }
Sissors 4:a7b9f778c4b4 96 else
Sissors 4:a7b9f778c4b4 97 dynamicPrescaler = false;
Sissors 4:a7b9f778c4b4 98
Sissors 4:a7b9f778c4b4 99 retval = setPrescaler(value);
Sissors 4:a7b9f778c4b4 100 updateTicks(retval);
Sissors 4:a7b9f778c4b4 101 return retval;
Sissors 4:a7b9f778c4b4 102 }
Sissors 4:a7b9f778c4b4 103
Sissors 4:a7b9f778c4b4 104 void FastPWM::updateTicks( uint32_t prescaler ) {
Sissors 4:a7b9f778c4b4 105 dticks = SystemCoreClock / (double)prescaler;
jocis 18:d91c0629e4e6 106 dticks_us = dticks / 1000000.0f;
jocis 18:d91c0629e4e6 107 iticks_us = (int)(dticks_us + 0.5);
jocis 18:d91c0629e4e6 108 iticks_ms = (int)(dticks_us * 1000.0 + 0.5);
Sissors 4:a7b9f778c4b4 109 }
Sissors 4:a7b9f778c4b4 110
Sissors 4:a7b9f778c4b4 111 int FastPWM::calcPrescaler(uint64_t clocks) {
Sissors 4:a7b9f778c4b4 112 uint32_t scale = (clocks >> bits) + 1;
Sissors 4:a7b9f778c4b4 113 uint32_t retval = setPrescaler(scale);
Sissors 4:a7b9f778c4b4 114 updateTicks(retval);
Sissors 4:a7b9f778c4b4 115 return retval;
Sissors 4:a7b9f778c4b4 116 }