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321 lines
12 KiB
321 lines
12 KiB
/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016 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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/**
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* servo.cpp - Interrupt driven Servo library for Arduino using 16 bit timers- Version 2
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* Copyright (c) 2009 Michael Margolis. All right reserved.
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*/
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/**
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* A servo is activated by creating an instance of the Servo class passing the desired pin to the attach() method.
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* The servos are pulsed in the background using the value most recently written using the write() method
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*
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* Note that analogWrite of PWM on pins associated with the timer are disabled when the first servo is attached.
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* Timers are seized as needed in groups of 12 servos - 24 servos use two timers, 48 servos will use four.
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*
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* The methods are:
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*
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* Servo - Class for manipulating servo motors connected to Arduino pins.
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*
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* attach(pin) - Attach a servo motor to an i/o pin.
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* attach(pin, min, max) - Attach to a pin, setting min and max values in microseconds
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* Default min is 544, max is 2400
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*
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* write() - Set the servo angle in degrees. (Invalid angles —over MIN_PULSE_WIDTH— are treated as µs.)
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* writeMicroseconds() - Set the servo pulse width in microseconds.
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* move(pin, angle) - Sequence of attach(pin), write(angle), delay(SERVO_DELAY).
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* With DEACTIVATE_SERVOS_AFTER_MOVE it detaches after SERVO_DELAY.
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* read() - Get the last-written servo pulse width as an angle between 0 and 180.
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* readMicroseconds() - Get the last-written servo pulse width in microseconds.
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* attached() - Return true if a servo is attached.
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* detach() - Stop an attached servo from pulsing its i/o pin.
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*
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*/
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#include "MarlinConfig.h"
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#if HAS_SERVOS
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#include <avr/interrupt.h>
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#include <Arduino.h>
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#include "servo.h"
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#define usToTicks(_us) (( clockCyclesPerMicrosecond()* _us) / 8) // converts microseconds to tick (assumes prescale of 8) // 12 Aug 2009
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#define ticksToUs(_ticks) (( (unsigned)_ticks * 8)/ clockCyclesPerMicrosecond() ) // converts from ticks back to microseconds
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#define TRIM_DURATION 2 // compensation ticks to trim adjust for digitalWrite delays // 12 August 2009
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//#define NBR_TIMERS ((MAX_SERVOS) / (SERVOS_PER_TIMER))
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static ServoInfo_t servo_info[MAX_SERVOS]; // static array of servo info structures
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static volatile int8_t Channel[_Nbr_16timers ]; // counter for the servo being pulsed for each timer (or -1 if refresh interval)
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uint8_t ServoCount = 0; // the total number of attached servos
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// convenience macros
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#define SERVO_INDEX_TO_TIMER(_servo_nbr) ((timer16_Sequence_t)(_servo_nbr / (SERVOS_PER_TIMER))) // returns the timer controlling this servo
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#define SERVO_INDEX_TO_CHANNEL(_servo_nbr) (_servo_nbr % (SERVOS_PER_TIMER)) // returns the index of the servo on this timer
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#define SERVO_INDEX(_timer,_channel) ((_timer*(SERVOS_PER_TIMER)) + _channel) // macro to access servo index by timer and channel
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#define SERVO(_timer,_channel) (servo_info[SERVO_INDEX(_timer,_channel)]) // macro to access servo class by timer and channel
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#define SERVO_MIN() (MIN_PULSE_WIDTH - this->min * 4) // minimum value in uS for this servo
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#define SERVO_MAX() (MAX_PULSE_WIDTH - this->max * 4) // maximum value in uS for this servo
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/************ static functions common to all instances ***********************/
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static inline void handle_interrupts(timer16_Sequence_t timer, volatile uint16_t* TCNTn, volatile uint16_t* OCRnA) {
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if (Channel[timer] < 0)
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*TCNTn = 0; // channel set to -1 indicated that refresh interval completed so reset the timer
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else {
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if (SERVO_INDEX(timer, Channel[timer]) < ServoCount && SERVO(timer, Channel[timer]).Pin.isActive)
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digitalWrite(SERVO(timer, Channel[timer]).Pin.nbr, LOW); // pulse this channel low if activated
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}
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Channel[timer]++; // increment to the next channel
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if (SERVO_INDEX(timer, Channel[timer]) < ServoCount && Channel[timer] < SERVOS_PER_TIMER) {
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*OCRnA = *TCNTn + SERVO(timer, Channel[timer]).ticks;
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if (SERVO(timer, Channel[timer]).Pin.isActive) // check if activated
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digitalWrite(SERVO(timer, Channel[timer]).Pin.nbr, HIGH); // its an active channel so pulse it high
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}
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else {
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// finished all channels so wait for the refresh period to expire before starting over
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if (((unsigned)*TCNTn) + 4 < usToTicks(REFRESH_INTERVAL)) // allow a few ticks to ensure the next OCR1A not missed
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*OCRnA = (unsigned int)usToTicks(REFRESH_INTERVAL);
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else
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*OCRnA = *TCNTn + 4; // at least REFRESH_INTERVAL has elapsed
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Channel[timer] = -1; // this will get incremented at the end of the refresh period to start again at the first channel
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}
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}
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#ifndef WIRING // Wiring pre-defines signal handlers so don't define any if compiling for the Wiring platform
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// Interrupt handlers for Arduino
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#if ENABLED(_useTimer1)
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SIGNAL (TIMER1_COMPA_vect) { handle_interrupts(_timer1, &TCNT1, &OCR1A); }
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#endif
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#if ENABLED(_useTimer3)
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SIGNAL (TIMER3_COMPA_vect) { handle_interrupts(_timer3, &TCNT3, &OCR3A); }
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#endif
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#if ENABLED(_useTimer4)
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SIGNAL (TIMER4_COMPA_vect) { handle_interrupts(_timer4, &TCNT4, &OCR4A); }
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#endif
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#if ENABLED(_useTimer5)
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SIGNAL (TIMER5_COMPA_vect) { handle_interrupts(_timer5, &TCNT5, &OCR5A); }
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#endif
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#else // WIRING
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// Interrupt handlers for Wiring
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#if ENABLED(_useTimer1)
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void Timer1Service() { handle_interrupts(_timer1, &TCNT1, &OCR1A); }
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#endif
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#if ENABLED(_useTimer3)
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void Timer3Service() { handle_interrupts(_timer3, &TCNT3, &OCR3A); }
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#endif
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#endif // WIRING
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static void initISR(timer16_Sequence_t timer) {
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#if ENABLED(_useTimer1)
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if (timer == _timer1) {
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TCCR1A = 0; // normal counting mode
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TCCR1B = _BV(CS11); // set prescaler of 8
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TCNT1 = 0; // clear the timer count
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#if defined(__AVR_ATmega8__)|| defined(__AVR_ATmega128__)
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SBI(TIFR, OCF1A); // clear any pending interrupts;
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SBI(TIMSK, OCIE1A); // enable the output compare interrupt
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#else
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// here if not ATmega8 or ATmega128
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SBI(TIFR1, OCF1A); // clear any pending interrupts;
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SBI(TIMSK1, OCIE1A); // enable the output compare interrupt
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#endif
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#ifdef WIRING
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timerAttach(TIMER1OUTCOMPAREA_INT, Timer1Service);
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#endif
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}
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#endif
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#if ENABLED(_useTimer3)
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if (timer == _timer3) {
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TCCR3A = 0; // normal counting mode
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TCCR3B = _BV(CS31); // set prescaler of 8
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TCNT3 = 0; // clear the timer count
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#ifdef __AVR_ATmega128__
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SBI(TIFR, OCF3A); // clear any pending interrupts;
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SBI(ETIMSK, OCIE3A); // enable the output compare interrupt
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#else
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TIFR3 = _BV(OCF3A); // clear any pending interrupts;
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TIMSK3 = _BV(OCIE3A) ; // enable the output compare interrupt
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#endif
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#ifdef WIRING
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timerAttach(TIMER3OUTCOMPAREA_INT, Timer3Service); // for Wiring platform only
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#endif
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}
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#endif
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#if ENABLED(_useTimer4)
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if (timer == _timer4) {
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TCCR4A = 0; // normal counting mode
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TCCR4B = _BV(CS41); // set prescaler of 8
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TCNT4 = 0; // clear the timer count
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TIFR4 = _BV(OCF4A); // clear any pending interrupts;
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TIMSK4 = _BV(OCIE4A) ; // enable the output compare interrupt
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}
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#endif
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#if ENABLED(_useTimer5)
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if (timer == _timer5) {
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TCCR5A = 0; // normal counting mode
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TCCR5B = _BV(CS51); // set prescaler of 8
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TCNT5 = 0; // clear the timer count
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TIFR5 = _BV(OCF5A); // clear any pending interrupts;
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TIMSK5 = _BV(OCIE5A) ; // enable the output compare interrupt
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}
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#endif
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}
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static void finISR(timer16_Sequence_t timer) {
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// Disable use of the given timer
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#ifdef WIRING
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if (timer == _timer1) {
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CBI(
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#if defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
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TIMSK1
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#else
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TIMSK
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#endif
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, OCIE1A); // disable timer 1 output compare interrupt
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timerDetach(TIMER1OUTCOMPAREA_INT);
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}
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else if (timer == _timer3) {
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CBI(
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#if defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
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TIMSK3
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#else
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ETIMSK
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#endif
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, OCIE3A); // disable the timer3 output compare A interrupt
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timerDetach(TIMER3OUTCOMPAREA_INT);
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}
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#else //!WIRING
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// For arduino - in future: call here to a currently undefined function to reset the timer
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UNUSED(timer);
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#endif
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}
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static bool isTimerActive(timer16_Sequence_t timer) {
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// returns true if any servo is active on this timer
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for (uint8_t channel = 0; channel < SERVOS_PER_TIMER; channel++) {
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if (SERVO(timer, channel).Pin.isActive)
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return true;
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}
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return false;
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}
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/****************** end of static functions ******************************/
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Servo::Servo() {
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if (ServoCount < MAX_SERVOS) {
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this->servoIndex = ServoCount++; // assign a servo index to this instance
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servo_info[this->servoIndex].ticks = usToTicks(DEFAULT_PULSE_WIDTH); // store default values - 12 Aug 2009
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}
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else
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this->servoIndex = INVALID_SERVO; // too many servos
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}
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int8_t Servo::attach(int pin) {
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return this->attach(pin, MIN_PULSE_WIDTH, MAX_PULSE_WIDTH);
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}
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int8_t Servo::attach(int pin, int min, int max) {
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if (this->servoIndex >= MAX_SERVOS) return -1;
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if (pin > 0) servo_info[this->servoIndex].Pin.nbr = pin;
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pinMode(servo_info[this->servoIndex].Pin.nbr, OUTPUT); // set servo pin to output
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// todo min/max check: abs(min - MIN_PULSE_WIDTH) /4 < 128
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this->min = (MIN_PULSE_WIDTH - min) / 4; //resolution of min/max is 4 uS
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this->max = (MAX_PULSE_WIDTH - max) / 4;
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// initialize the timer if it has not already been initialized
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timer16_Sequence_t timer = SERVO_INDEX_TO_TIMER(servoIndex);
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if (!isTimerActive(timer)) initISR(timer);
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servo_info[this->servoIndex].Pin.isActive = true; // this must be set after the check for isTimerActive
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return this->servoIndex;
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}
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void Servo::detach() {
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servo_info[this->servoIndex].Pin.isActive = false;
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timer16_Sequence_t timer = SERVO_INDEX_TO_TIMER(servoIndex);
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if (!isTimerActive(timer)) finISR(timer);
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}
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void Servo::write(int value) {
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if (value < MIN_PULSE_WIDTH) { // treat values less than 544 as angles in degrees (valid values in microseconds are handled as microseconds)
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value = map(constrain(value, 0, 180), 0, 180, SERVO_MIN(), SERVO_MAX());
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}
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this->writeMicroseconds(value);
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}
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void Servo::writeMicroseconds(int value) {
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// calculate and store the values for the given channel
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byte channel = this->servoIndex;
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if (channel < MAX_SERVOS) { // ensure channel is valid
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// ensure pulse width is valid
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value = constrain(value, SERVO_MIN(), SERVO_MAX()) - (TRIM_DURATION);
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value = usToTicks(value); // convert to ticks after compensating for interrupt overhead - 12 Aug 2009
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CRITICAL_SECTION_START;
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servo_info[channel].ticks = value;
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CRITICAL_SECTION_END;
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}
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}
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// return the value as degrees
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int Servo::read() { return map(this->readMicroseconds() + 1, SERVO_MIN(), SERVO_MAX(), 0, 180); }
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int Servo::readMicroseconds() {
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return (this->servoIndex == INVALID_SERVO) ? 0 : ticksToUs(servo_info[this->servoIndex].ticks) + TRIM_DURATION;
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}
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bool Servo::attached() { return servo_info[this->servoIndex].Pin.isActive; }
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void Servo::move(int value) {
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if (this->attach(0) >= 0) {
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this->write(value);
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delay(SERVO_DELAY);
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#if ENABLED(DEACTIVATE_SERVOS_AFTER_MOVE)
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this->detach();
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#endif
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}
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}
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#endif
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