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- /**
- * 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/>.
- *
- */
-
- /*
- Copyright (c) 2013 Arduino LLC. All right reserved.
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This library 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
- #ifdef ARDUINO_ARCH_SAM
-
- #include "../../inc/MarlinConfig.h"
-
- #if HAS_SERVOS
-
- #include "../shared/servo.h"
- #include "../shared/servo_private.h"
-
- static Flags<_Nbr_16timers> DisablePending; // ISR should disable the timer at the next timer reset
-
- // ------------------------
- /// Interrupt handler for the TC0 channel 1.
- // ------------------------
- void Servo_Handler(const timer16_Sequence_t, Tc*, const uint8_t);
-
- #ifdef _useTimer1
- void HANDLER_FOR_TIMER1() { Servo_Handler(_timer1, TC_FOR_TIMER1, CHANNEL_FOR_TIMER1); }
- #endif
- #ifdef _useTimer2
- void HANDLER_FOR_TIMER2() { Servo_Handler(_timer2, TC_FOR_TIMER2, CHANNEL_FOR_TIMER2); }
- #endif
- #ifdef _useTimer3
- void HANDLER_FOR_TIMER3() { Servo_Handler(_timer3, TC_FOR_TIMER3, CHANNEL_FOR_TIMER3); }
- #endif
- #ifdef _useTimer4
- void HANDLER_FOR_TIMER4() { Servo_Handler(_timer4, TC_FOR_TIMER4, CHANNEL_FOR_TIMER4); }
- #endif
- #ifdef _useTimer5
- void HANDLER_FOR_TIMER5() { Servo_Handler(_timer5, TC_FOR_TIMER5, CHANNEL_FOR_TIMER5); }
- #endif
-
- void Servo_Handler(const timer16_Sequence_t timer, Tc *tc, const uint8_t channel) {
- static int8_t Channel[_Nbr_16timers]; // Servo counters to pulse (or -1 for refresh interval)
- int8_t cho = Channel[timer]; // Handle the prior Channel[timer] first
- if (cho < 0) { // Channel -1 indicates the refresh interval completed...
- tc->TC_CHANNEL[channel].TC_CCR |= TC_CCR_SWTRG; // ...so reset the timer
- if (DisablePending[timer]) {
- // Disabling only after the full servo period expires prevents
- // pulses being too close together if immediately re-enabled.
- DisablePending.clear(timer);
- TC_Stop(tc, channel);
- tc->TC_CHANNEL[channel].TC_SR; // clear interrupt
- return;
- }
- }
- else if (SERVO_INDEX(timer, cho) < ServoCount) // prior channel handled?
- extDigitalWrite(SERVO(timer, cho).Pin.nbr, LOW); // pulse the prior channel LOW
-
- Channel[timer] = ++cho; // go to the next channel (or 0)
- if (cho < SERVOS_PER_TIMER && SERVO_INDEX(timer, cho) < ServoCount) {
- tc->TC_CHANNEL[channel].TC_RA = tc->TC_CHANNEL[channel].TC_CV + SERVO(timer, cho).ticks;
- if (SERVO(timer, cho).Pin.isActive) // activated?
- extDigitalWrite(SERVO(timer, cho).Pin.nbr, HIGH); // yes: pulse HIGH
- }
- else {
- // finished all channels so wait for the refresh period to expire before starting over
- const unsigned int cval = tc->TC_CHANNEL[channel].TC_CV + 128 / (SERVO_TIMER_PRESCALER), // allow 128 cycles to ensure the next CV not missed
- ival = (unsigned int)usToTicks(REFRESH_INTERVAL); // at least REFRESH_INTERVAL has elapsed
- tc->TC_CHANNEL[channel].TC_RA = max(cval, ival);
-
- Channel[timer] = -1; // reset the timer CCR on the next call
- }
-
- tc->TC_CHANNEL[channel].TC_SR; // clear interrupt
- }
-
- static void _initISR(Tc *tc, uint32_t channel, uint32_t id, IRQn_Type irqn) {
- pmc_enable_periph_clk(id);
- TC_Configure(tc, channel,
- TC_CMR_WAVE // Waveform mode
- | TC_CMR_WAVSEL_UP_RC // Counter running up and reset when equal to RC
- | (SERVO_TIMER_PRESCALER == 2 ? TC_CMR_TCCLKS_TIMER_CLOCK1 : 0) // MCK/2
- | (SERVO_TIMER_PRESCALER == 8 ? TC_CMR_TCCLKS_TIMER_CLOCK2 : 0) // MCK/8
- | (SERVO_TIMER_PRESCALER == 32 ? TC_CMR_TCCLKS_TIMER_CLOCK3 : 0) // MCK/32
- | (SERVO_TIMER_PRESCALER == 128 ? TC_CMR_TCCLKS_TIMER_CLOCK4 : 0) // MCK/128
- );
-
- // Wait 1ms before the first ISR
- TC_SetRA(tc, channel, (F_CPU) / (SERVO_TIMER_PRESCALER) / 1000UL); // 1ms
-
- // Configure and enable interrupt
- NVIC_EnableIRQ(irqn);
- tc->TC_CHANNEL[channel].TC_IER = TC_IER_CPAS; // TC_IER_CPAS: RA Compare
-
- // Enables the timer clock and performs a software reset to start the counting
- TC_Start(tc, channel);
- }
-
- void initISR(const timer16_Sequence_t timer_index) {
- CRITICAL_SECTION_START();
- const bool disable_soon = DisablePending[timer_index];
- DisablePending.clear(timer_index);
- CRITICAL_SECTION_END();
-
- if (!disable_soon) switch (timer_index) {
- default: break;
- #ifdef _useTimer1
- case _timer1: return _initISR(TC_FOR_TIMER1, CHANNEL_FOR_TIMER1, ID_TC_FOR_TIMER1, IRQn_FOR_TIMER1);
- #endif
- #ifdef _useTimer2
- case _timer2: return _initISR(TC_FOR_TIMER2, CHANNEL_FOR_TIMER2, ID_TC_FOR_TIMER2, IRQn_FOR_TIMER2);
- #endif
- #ifdef _useTimer3
- case _timer3: return _initISR(TC_FOR_TIMER3, CHANNEL_FOR_TIMER3, ID_TC_FOR_TIMER3, IRQn_FOR_TIMER3);
- #endif
- #ifdef _useTimer4
- case _timer4: return _initISR(TC_FOR_TIMER4, CHANNEL_FOR_TIMER4, ID_TC_FOR_TIMER4, IRQn_FOR_TIMER4);
- #endif
- #ifdef _useTimer5
- case _timer5: return _initISR(TC_FOR_TIMER5, CHANNEL_FOR_TIMER5, ID_TC_FOR_TIMER5, IRQn_FOR_TIMER5);
- #endif
- }
- }
-
- void finISR(const timer16_Sequence_t timer_index) {
- // Timer is disabled from the ISR, to ensure proper final pulse length.
- DisablePending.set(timer_index);
- }
-
- #endif // HAS_SERVOS
-
- #endif // ARDUINO_ARCH_SAM
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