63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
/**
|
|
* Marlin 3D Printer Firmware
|
|
* Copyright (C) 2016 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 <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* Description: Tone function for Arduino Due and compatible (SAM3X8E)
|
|
* Derived from http://forum.arduino.cc/index.php?topic=136500.msg2903012#msg2903012
|
|
*/
|
|
|
|
#ifdef ARDUINO_ARCH_SAM
|
|
|
|
#include "HAL_Due.h"
|
|
#include "HAL_timers_Due.h"
|
|
|
|
static pin_t tone_pin;
|
|
volatile static int32_t toggles;
|
|
|
|
void toneInit() {
|
|
HAL_timer_start(TONE_TIMER_NUM, 1); // Lowest frequency possible
|
|
}
|
|
|
|
void tone(const pin_t _pin, const unsigned int frequency, const unsigned long duration) {
|
|
tone_pin = _pin;
|
|
toggles = 2 * frequency * duration / 1000;
|
|
HAL_timer_set_compare(TONE_TIMER_NUM, VARIANT_MCK / 2 / frequency); // 84MHz / 2 prescaler / Hz
|
|
HAL_timer_enable_interrupt(TONE_TIMER_NUM);
|
|
}
|
|
|
|
void noTone(const pin_t _pin) {
|
|
HAL_timer_disable_interrupt(TONE_TIMER_NUM);
|
|
digitalWrite(_pin, LOW);
|
|
}
|
|
|
|
HAL_TONE_TIMER_ISR {
|
|
static uint8_t pin_state = 0;
|
|
HAL_timer_isr_prologue(TONE_TIMER_NUM);
|
|
if (toggles) {
|
|
toggles--;
|
|
digitalWrite(tone_pin, (pin_state ^= 1));
|
|
}
|
|
else noTone(tone_pin); // seems superfluous ?
|
|
}
|
|
|
|
#endif // ARDUINO_ARCH_SAM
|