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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
*
* SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
*
* 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/>.
*
*/
/**
* Description: Tone function for Arduino Due and compatible (SAM3X8E)
* Derived from https://forum.arduino.cc/index.php?topic=136500.msg2903012#msg2903012
*/
#ifdef ARDUINO_ARCH_SAM
#include "../../inc/MarlinConfig.h"
#include "HAL.h"
static pin_t tone_pin;
volatile static int32_t toggles;
void tone(const pin_t _pin, const unsigned int frequency, const unsigned long duration) {
tone_pin = _pin;
toggles = 2 * frequency * duration / 1000;
HAL_timer_start(TONE_TIMER_NUM, 2 * frequency);
}
void noTone(const pin_t _pin) {
HAL_timer_disable_interrupt(TONE_TIMER_NUM);
extDigitalWrite(_pin, LOW);
}
HAL_TONE_TIMER_ISR() {
static uint8_t pin_state = 0;
HAL_timer_isr_prologue(TONE_TIMER_NUM);
if (toggles) {
toggles--;
extDigitalWrite(tone_pin, (pin_state ^= 1));
}
else noTone(tone_pin); // turn off interrupt
}
#endif // ARDUINO_ARCH_SAM
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