Firmware2/Marlin/src/HAL/HAL_ESP32/HAL_Servo_ESP32.cpp

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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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*
* Based on Sprinter and grbl.
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* Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
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*
* 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 <http://www.gnu.org/licenses/>.
*
*/
#ifdef ARDUINO_ARCH_ESP32
#include "../../inc/MarlinConfig.h"
#if HAS_SERVOS
#include "HAL_Servo_ESP32.h"
// Adjacent channels (0/1, 2/3 etc.) share the same timer and therefore the same frequency and resolution settings on ESP32,
// so we only allocate servo channels up high to avoid side effects with regards to analogWrite (fans, leds, laser pwm etc.)
int Servo::channel_next_free = 12;
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Servo::Servo() {
this->channel = channel_next_free++;
}
int8_t Servo::attach(const int pin) {
if (this->channel >= CHANNEL_MAX_NUM) return -1;
if (pin > 0) this->pin = pin;
ledcSetup(this->channel, 50, 16); // channel X, 50 Hz, 16-bit depth
ledcAttachPin(this->pin, this->channel);
return true;
}
void Servo::detach() { ledcDetachPin(this->pin); }
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int Servo::read() { return this->degrees; }
void Servo::write(int degrees) {
this->degrees = constrain(degrees, MIN_ANGLE, MAX_ANGLE);
int us = map(this->degrees, MIN_ANGLE, MAX_ANGLE, MIN_PULSE_WIDTH, MAX_PULSE_WIDTH);
int duty = map(us, 0, TAU_USEC, 0, MAX_COMPARE);
ledcWrite(channel, duty);
}
void Servo::move(const int value) {
constexpr uint16_t servo_delay[] = SERVO_DELAY;
static_assert(COUNT(servo_delay) == NUM_SERVOS, "SERVO_DELAY must be an array NUM_SERVOS long.");
if (this->attach(0) >= 0) {
this->write(value);
safe_delay(servo_delay[this->channel]);
#if ENABLED(DEACTIVATE_SERVOS_AFTER_MOVE)
this->detach();
#endif
}
}
#endif // HAS_SERVOS
#endif // ARDUINO_ARCH_ESP32