69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
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/**
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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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#if NEEDS_HARDWARE_PWM
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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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void set_pwm_frequency(const pin_t pin, int 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 = PIN_MAP[pin].timer_device;
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uint8_t channel = PIN_MAP[pin].timer_channel;
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// Protect used timers
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if (timer == get_timer_dev(TEMP_TIMER_NUM)) return;
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if (timer == get_timer_dev(STEP_TIMER_NUM)) return;
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#if PULSE_TIMER_NUM != STEP_TIMER_NUM
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if (timer == get_timer_dev(PULSE_TIMER_NUM)) 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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timer_set_mode(timer, channel, TIMER_PWM);
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uint16_t preload = 255; // Lock 255 PWM resolution for high frequencies
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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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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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timer_dev *timer = PIN_MAP[pin].timer_device;
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uint16_t max_val = timer->regs.bas->ARR * v / v_size;
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if (invert) max_val = v_size - max_val;
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pwmWrite(pin, max_val);
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}
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#endif // NEEDS_HARDWARE_PWM
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#endif // __STM32F1__
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