272 lines
8.4 KiB
C++
272 lines
8.4 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifdef __AVR__
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#include "../../inc/MarlinConfigPre.h"
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#if ENABLED(FAST_PWM_FAN)
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#include "HAL.h"
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struct Timer {
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volatile uint8_t* TCCRnQ[3]; // max 3 TCCR registers per timer
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volatile uint16_t* OCRnQ[3]; // max 3 OCR registers per timer
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volatile uint16_t* ICRn; // max 1 ICR register per timer
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uint8_t n; // the timer number [0->5]
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uint8_t q; // the timer output [0->2] (A->C)
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};
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/**
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* get_pwm_timer
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* Get the timer information and register of the provided pin.
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* Return a Timer struct containing this information.
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* Used by set_pwm_frequency, set_pwm_duty
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*/
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Timer get_pwm_timer(const pin_t pin) {
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uint8_t q = 0;
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switch (digitalPinToTimer(pin)) {
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// Protect reserved timers (TIMER0 & TIMER1)
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#ifdef TCCR0A
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#if !AVR_AT90USB1286_FAMILY
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case TIMER0A:
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#endif
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case TIMER0B:
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#endif
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#ifdef TCCR1A
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case TIMER1A: case TIMER1B:
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#endif
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break;
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#if defined(TCCR2) || defined(TCCR2A)
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#ifdef TCCR2
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case TIMER2: {
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Timer timer = {
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/*TCCRnQ*/ { &TCCR2, nullptr, nullptr},
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/*OCRnQ*/ { (uint16_t*)&OCR2, nullptr, nullptr},
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/*ICRn*/ nullptr,
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/*n, q*/ 2, 0
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};
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}
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#elif defined TCCR2A
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#if ENABLED(USE_OCR2A_AS_TOP)
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case TIMER2A: break; // protect TIMER2A
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case TIMER2B: {
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Timer timer = {
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/*TCCRnQ*/ { &TCCR2A, &TCCR2B, nullptr},
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/*OCRnQ*/ { (uint16_t*)&OCR2A, (uint16_t*)&OCR2B, nullptr},
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/*ICRn*/ nullptr,
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/*n, q*/ 2, 1
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};
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return timer;
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}
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#else
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case TIMER2B: ++q;
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case TIMER2A: {
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Timer timer = {
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/*TCCRnQ*/ { &TCCR2A, &TCCR2B, nullptr},
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/*OCRnQ*/ { (uint16_t*)&OCR2A, (uint16_t*)&OCR2B, nullptr},
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/*ICRn*/ nullptr,
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2, q
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};
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return timer;
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}
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#endif
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#endif
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#endif
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#ifdef TCCR3A
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case TIMER3C: ++q;
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case TIMER3B: ++q;
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case TIMER3A: {
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Timer timer = {
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/*TCCRnQ*/ { &TCCR3A, &TCCR3B, &TCCR3C},
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/*OCRnQ*/ { &OCR3A, &OCR3B, &OCR3C},
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/*ICRn*/ &ICR3,
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/*n, q*/ 3, q
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};
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return timer;
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}
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#endif
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#ifdef TCCR4A
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case TIMER4C: ++q;
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case TIMER4B: ++q;
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case TIMER4A: {
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Timer timer = {
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/*TCCRnQ*/ { &TCCR4A, &TCCR4B, &TCCR4C},
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/*OCRnQ*/ { &OCR4A, &OCR4B, &OCR4C},
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/*ICRn*/ &ICR4,
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/*n, q*/ 4, q
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};
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return timer;
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}
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#endif
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#ifdef TCCR5A
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case TIMER5C: ++q;
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case TIMER5B: ++q;
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case TIMER5A: {
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Timer timer = {
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/*TCCRnQ*/ { &TCCR5A, &TCCR5B, &TCCR5C},
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/*OCRnQ*/ { &OCR5A, &OCR5B, &OCR5C },
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/*ICRn*/ &ICR5,
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/*n, q*/ 5, q
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};
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return timer;
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}
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#endif
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}
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Timer timer = {
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/*TCCRnQ*/ { nullptr, nullptr, nullptr},
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/*OCRnQ*/ { nullptr, nullptr, nullptr},
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/*ICRn*/ nullptr,
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0, 0
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};
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return timer;
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}
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void set_pwm_frequency(const pin_t pin, int f_desired) {
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Timer timer = get_pwm_timer(pin);
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if (timer.n == 0) return; // Don't proceed if protected timer or not recognised
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uint16_t size;
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if (timer.n == 2) size = 255; else size = 65535;
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uint16_t res = 255; // resolution (TOP value)
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uint8_t j = 0; // prescaler index
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uint8_t wgm = 1; // waveform generation mode
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// Calculating the prescaler and resolution to use to achieve closest frequency
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if (f_desired != 0) {
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int f = (F_CPU) / (2 * 1024 * size) + 1; // Initialize frequency as lowest (non-zero) achievable
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uint16_t prescaler[] = { 0, 1, 8, /*TIMER2 ONLY*/32, 64, /*TIMER2 ONLY*/128, 256, 1024 };
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// loop over prescaler values
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for (uint8_t i = 1; i < 8; i++) {
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uint16_t res_temp_fast = 255, res_temp_phase_correct = 255;
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if (timer.n == 2) {
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// No resolution calculation for TIMER2 unless enabled USE_OCR2A_AS_TOP
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#if ENABLED(USE_OCR2A_AS_TOP)
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const uint16_t rtf = (F_CPU) / (prescaler[i] * f_desired);
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res_temp_fast = rtf - 1;
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res_temp_phase_correct = rtf / 2;
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#endif
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}
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else {
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// Skip TIMER2 specific prescalers when not TIMER2
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if (i == 3 || i == 5) continue;
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const uint16_t rtf = (F_CPU) / (prescaler[i] * f_desired);
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res_temp_fast = rtf - 1;
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res_temp_phase_correct = rtf / 2;
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}
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LIMIT(res_temp_fast, 1u, size);
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LIMIT(res_temp_phase_correct, 1u, size);
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// Calculate frequencies of test prescaler and resolution values
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const int f_temp_fast = (F_CPU) / (prescaler[i] * (1 + res_temp_fast)),
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f_temp_phase_correct = (F_CPU) / (2 * prescaler[i] * res_temp_phase_correct),
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f_diff = ABS(f - f_desired),
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f_fast_diff = ABS(f_temp_fast - f_desired),
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f_phase_diff = ABS(f_temp_phase_correct - f_desired);
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// If FAST values are closest to desired f
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if (f_fast_diff < f_diff && f_fast_diff <= f_phase_diff) {
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// Remember this combination
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f = f_temp_fast;
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res = res_temp_fast;
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j = i;
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// Set the Wave Generation Mode to FAST PWM
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if (timer.n == 2) {
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wgm = (
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#if ENABLED(USE_OCR2A_AS_TOP)
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WGM2_FAST_PWM_OCR2A
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#else
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WGM2_FAST_PWM
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#endif
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);
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}
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else wgm = WGM_FAST_PWM_ICRn;
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}
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// If PHASE CORRECT values are closes to desired f
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else if (f_phase_diff < f_diff) {
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f = f_temp_phase_correct;
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res = res_temp_phase_correct;
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j = i;
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// Set the Wave Generation Mode to PWM PHASE CORRECT
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if (timer.n == 2) {
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wgm = (
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#if ENABLED(USE_OCR2A_AS_TOP)
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WGM2_PWM_PC_OCR2A
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#else
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WGM2_PWM_PC
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#endif
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);
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}
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else wgm = WGM_PWM_PC_ICRn;
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}
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}
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}
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_SET_WGMnQ(timer.TCCRnQ, wgm);
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_SET_CSn(timer.TCCRnQ, j);
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if (timer.n == 2) {
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#if ENABLED(USE_OCR2A_AS_TOP)
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_SET_OCRnQ(timer.OCRnQ, 0, res); // Set OCR2A value (TOP) = res
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#endif
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}
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else
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_SET_ICRn(timer.ICRn, res); // Set ICRn value (TOP) = res
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}
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void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) {
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// If v is 0 or v_size (max), digitalWrite to LOW or HIGH.
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// Note that digitalWrite also disables pwm output for us (sets COM bit to 0)
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if (v == 0)
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digitalWrite(pin, invert);
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else if (v == v_size)
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digitalWrite(pin, !invert);
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else {
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Timer timer = get_pwm_timer(pin);
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if (timer.n == 0) return; // Don't proceed if protected timer or not recognised
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// Set compare output mode to CLEAR -> SET or SET -> CLEAR (if inverted)
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_SET_COMnQ(timer.TCCRnQ, (timer.q
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#ifdef TCCR2
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+ (timer.q == 2) // COM20 is on bit 4 of TCCR2, thus requires q + 1 in the macro
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#endif
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), COM_CLEAR_SET + invert
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);
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uint16_t top;
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if (timer.n == 2) { // if TIMER2
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top = (
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#if ENABLED(USE_OCR2A_AS_TOP)
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*timer.OCRnQ[0] // top = OCR2A
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#else
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255 // top = 0xFF (max)
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#endif
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);
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}
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else
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top = *timer.ICRn; // top = ICRn
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_SET_OCRnQ(timer.OCRnQ, timer.q, v * float(top / v_size)); // Scale 8/16-bit v to top value
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}
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}
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#endif // FAST_PWM_FAN
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#endif // __AVR__
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