Victor
4 years ago
committed by
Scott Lahteine
4 changed files with 87 additions and 8 deletions
@ -0,0 +1,68 @@ |
|||
/**
|
|||
* Marlin 3D Printer Firmware |
|||
* Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
|
|||
* |
|||
* Based on Sprinter and grbl. |
|||
* Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm |
|||
* |
|||
* This program is free software: you can redistribute it and/or modify |
|||
* it under the terms of the GNU General Public License as published by |
|||
* the Free Software Foundation, either version 3 of the License, or |
|||
* (at your option) any later version. |
|||
* |
|||
* This program is distributed in the hope that it will be useful, |
|||
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|||
* GNU General Public License for more details. |
|||
* |
|||
* You should have received a copy of the GNU General Public License |
|||
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|||
* |
|||
*/ |
|||
#ifdef __STM32F1__ |
|||
|
|||
#include "../../inc/MarlinConfigPre.h" |
|||
|
|||
#if NEEDS_HARDWARE_PWM |
|||
|
|||
#include <pwm.h> |
|||
#include "HAL.h" |
|||
#include "timers.h" |
|||
|
|||
void set_pwm_frequency(const pin_t pin, int f_desired) { |
|||
if (!PWM_PIN(pin)) return; // Don't proceed if no hardware timer
|
|||
|
|||
timer_dev *timer = PIN_MAP[pin].timer_device; |
|||
uint8_t channel = PIN_MAP[pin].timer_channel; |
|||
|
|||
// Protect used timers
|
|||
if (timer == get_timer_dev(TEMP_TIMER_NUM)) return; |
|||
if (timer == get_timer_dev(STEP_TIMER_NUM)) return; |
|||
#if PULSE_TIMER_NUM != STEP_TIMER_NUM |
|||
if (timer == get_timer_dev(PULSE_TIMER_NUM)) return; |
|||
#endif |
|||
|
|||
if (!(timer->regs.bas->SR & TIMER_CR1_CEN)) // Ensure the timer is enabled
|
|||
timer_init(timer); |
|||
|
|||
timer_set_mode(timer, channel, TIMER_PWM); |
|||
uint16_t preload = 255; // Lock 255 PWM resolution for high frequencies
|
|||
int32_t prescaler = (HAL_TIMER_RATE) / (preload + 1) / f_desired - 1; |
|||
if (prescaler > 65535) { // For low frequencies increase prescaler
|
|||
prescaler = 65535; |
|||
preload = (HAL_TIMER_RATE) / (prescaler + 1) / f_desired - 1; |
|||
} |
|||
if (prescaler < 0) return; // Too high frequency
|
|||
timer_set_reload(timer, preload); |
|||
timer_set_prescaler(timer, prescaler); |
|||
} |
|||
|
|||
void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size/*=255*/, const bool invert/*=false*/) { |
|||
timer_dev *timer = PIN_MAP[pin].timer_device; |
|||
uint16_t max_val = timer->regs.bas->ARR * v / v_size; |
|||
if (invert) max_val = v_size - max_val; |
|||
pwmWrite(pin, max_val); |
|||
} |
|||
|
|||
#endif // NEEDS_HARDWARE_PWM
|
|||
#endif // __STM32F1__
|
Loading…
Reference in new issue