Michael Ernst Peter / FastPWM

Fork of original FastPWM libary from Sissors.

Dependents:   PM2_Libary PM2_Libary

FastPWM_common.cpp@36:1cc92cba9e04, 2022-01-24 (annotated)

Committer:
pmic
Date:
Mon Jan 24 10:07:25 2022 +0000
Revision:
36:1cc92cba9e04
Parent:
35:d6c2b73d71f5
Child:
37:0ca2cf9a1437
Added overloaded pulse function so it can be used with float values.

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
Sissors 4:a7b9f778c4b4 73 double FastPWM::read( void ) {
Sissors 4:a7b9f778c4b4 74 return _duty;
Sissors 4:a7b9f778c4b4 75 }
Sissors 4:a7b9f778c4b4 76
Sissors 4:a7b9f778c4b4 77 FastPWM & FastPWM::operator= (double value) {
Sissors 4:a7b9f778c4b4 78 write(value);
Sissors 4:a7b9f778c4b4 79 return(*this);
Sissors 4:a7b9f778c4b4 80 }
Sissors 4:a7b9f778c4b4 81
Sissors 4:a7b9f778c4b4 82 FastPWM::operator double() {
Sissors 4:a7b9f778c4b4 83 return _duty;
Sissors 4:a7b9f778c4b4 84 }
Sissors 4:a7b9f778c4b4 85
Sissors 4:a7b9f778c4b4 86 int FastPWM::prescaler(int value) {
Sissors 4:a7b9f778c4b4 87 int retval;
Sissors 4:a7b9f778c4b4 88 if (value == -1) {
Sissors 4:a7b9f778c4b4 89 dynamicPrescaler = true;
Sissors 4:a7b9f778c4b4 90 value = 0;
Sissors 4:a7b9f778c4b4 91 }
Sissors 4:a7b9f778c4b4 92 else
Sissors 4:a7b9f778c4b4 93 dynamicPrescaler = false;
Sissors 4:a7b9f778c4b4 94
Sissors 4:a7b9f778c4b4 95 retval = setPrescaler(value);
Sissors 4:a7b9f778c4b4 96 updateTicks(retval);
Sissors 4:a7b9f778c4b4 97 return retval;
Sissors 4:a7b9f778c4b4 98 }
Sissors 4:a7b9f778c4b4 99
Sissors 4:a7b9f778c4b4 100 void FastPWM::updateTicks( uint32_t prescaler ) {
Sissors 4:a7b9f778c4b4 101 dticks = SystemCoreClock / (double)prescaler;
jocis 18:d91c0629e4e6 102 dticks_us = dticks / 1000000.0f;
jocis 18:d91c0629e4e6 103 iticks_us = (int)(dticks_us + 0.5);
jocis 18:d91c0629e4e6 104 iticks_ms = (int)(dticks_us * 1000.0 + 0.5);
Sissors 4:a7b9f778c4b4 105 }
Sissors 4:a7b9f778c4b4 106
Sissors 4:a7b9f778c4b4 107 int FastPWM::calcPrescaler(uint64_t clocks) {
Sissors 4:a7b9f778c4b4 108 uint32_t scale = (clocks >> bits) + 1;
Sissors 4:a7b9f778c4b4 109 uint32_t retval = setPrescaler(scale);
Sissors 4:a7b9f778c4b4 110 updateTicks(retval);
Sissors 4:a7b9f778c4b4 111 return retval;
Sissors 4:a7b9f778c4b4 112 }