88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
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*
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*/
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#ifdef __STM32F1__
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#include "../../inc/MarlinConfigPre.h"
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#include <pwm.h>
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#include "HAL.h"
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#include "timers.h"
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#define NR_TIMERS TERN(STM32_XL_DENSITY, 14, 8) // Maple timers, 14 for STM32_XL_DENSITY (F/G chips), 8 for HIGH density (C D E)
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static uint16_t timer_freq[NR_TIMERS];
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inline uint8_t timer_and_index_for_pin(const pin_t pin, timer_dev **timer_ptr) {
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*timer_ptr = PIN_MAP[pin].timer_device;
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for (uint8_t i = 0; i < NR_TIMERS; i++) if (*timer_ptr == HAL_get_timer_dev(i))
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return i;
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return 0;
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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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const uint16_t duty = invert ? v_size - v : v;
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if (PWM_PIN(pin)) {
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timer_dev *timer; UNUSED(timer);
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if (timer_freq[timer_and_index_for_pin(pin, &timer)] == 0)
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set_pwm_frequency(pin, PWM_FREQUENCY);
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const uint8_t channel = PIN_MAP[pin].timer_channel;
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timer_set_compare(timer, channel, duty);
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timer_set_mode(timer, channel, TIMER_PWM); // PWM Output Mode
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}
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else {
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pinMode(pin, OUTPUT);
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digitalWrite(pin, duty < v_size / 2 ? LOW : HIGH);
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}
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}
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void set_pwm_frequency(const pin_t pin, const uint16_t f_desired) {
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if (!PWM_PIN(pin)) return; // Don't proceed if no hardware timer
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timer_dev *timer; UNUSED(timer);
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timer_freq[timer_and_index_for_pin(pin, &timer)] = f_desired;
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// Protect used timers
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if (timer == HAL_get_timer_dev(MF_TIMER_TEMP)) return;
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if (timer == HAL_get_timer_dev(MF_TIMER_STEP)) return;
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#if MF_TIMER_PULSE != MF_TIMER_STEP
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if (timer == HAL_get_timer_dev(MF_TIMER_PULSE)) return;
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#endif
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if (!(timer->regs.bas->SR & TIMER_CR1_CEN)) // Ensure the timer is enabled
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timer_init(timer);
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const uint8_t channel = PIN_MAP[pin].timer_channel;
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timer_set_mode(timer, channel, TIMER_PWM);
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// Preload (resolution) cannot be equal to duty of 255 otherwise it may not result in digital off or on.
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uint16_t preload = 254;
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int32_t prescaler = (HAL_TIMER_RATE) / (preload + 1) / f_desired - 1;
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if (prescaler > 65535) { // For low frequencies increase prescaler
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prescaler = 65535;
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preload = (HAL_TIMER_RATE) / (prescaler + 1) / f_desired - 1;
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}
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if (prescaler < 0) return; // Too high frequency
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timer_set_reload(timer, preload);
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timer_set_prescaler(timer, prescaler);
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}
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#endif // __STM32F1__
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