58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/**
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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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* Description: Tone function for Arduino Due and compatible (SAM3X8E)
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* Derived from http://forum.arduino.cc/index.php?topic=136500.msg2903012#msg2903012
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*/
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#ifdef ARDUINO_ARCH_SAM
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#include "HAL.h"
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#include "HAL_timers_Due.h"
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static pin_t tone_pin;
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volatile static int32_t toggles;
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void tone(const pin_t _pin, const unsigned int frequency, const unsigned long duration) {
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tone_pin = _pin;
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toggles = 2 * frequency * duration / 1000;
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HAL_timer_start(TONE_TIMER_NUM, 2 * frequency);
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}
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void noTone(const pin_t _pin) {
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HAL_timer_disable_interrupt(TONE_TIMER_NUM);
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digitalWrite(_pin, LOW);
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}
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HAL_TONE_TIMER_ISR {
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static uint8_t pin_state = 0;
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HAL_timer_isr_prologue(TONE_TIMER_NUM);
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if (toggles) {
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toggles--;
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digitalWrite(tone_pin, (pin_state ^= 1));
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}
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else noTone(tone_pin); // turn off interrupt
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}
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#endif // ARDUINO_ARCH_SAM
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