ESP32 Tone Generator (#20704)

Marlin/src/HAL/ESP32/HAL.h

@@ -90,6 +90,13 @@ extern uint16_t HAL_adc_result;
 // Public functions
 // ------------------------
 
+//
+// Tone
+//
+void toneInit();
+void tone(const pin_t _pin, const unsigned int frequency, const unsigned long duration=0);
+void noTone(const pin_t _pin);
+
 // clear reset reason
 void HAL_clear_reset_source();
 

Marlin/src/HAL/ESP32/Tone.cpp

@@ -0,0 +1,59 @@
+/**
+ * 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
+ *
+ * Copypaste of 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 ESP32
+ * Derived from https://forum.arduino.cc/index.php?topic=136500.msg2903012#msg2903012
+ */
+
+#ifdef ARDUINO_ARCH_ESP32
+
+#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);
+  WRITE(_pin, LOW);
+}
+
+HAL_TONE_TIMER_ISR() {
+  HAL_timer_isr_prologue(TONE_TIMER_NUM);
+
+  if (toggles) {
+    toggles--;
+    TOGGLE(tone_pin);
+  }
+  else noTone(tone_pin);                         // turn off interrupt
+}
+
+#endif // ARDUINO_ARCH_ESP32

Marlin/src/HAL/ESP32/timers.cpp

@@ -45,7 +45,7 @@ const tTimerConfig TimerConfig [NUM_HARDWARE_TIMERS] = {
   { TIMER_GROUP_0, TIMER_0, STEPPER_TIMER_PRESCALE, stepTC_Handler }, // 0 - Stepper
   { TIMER_GROUP_0, TIMER_1,    TEMP_TIMER_PRESCALE, tempTC_Handler }, // 1 - Temperature
   { TIMER_GROUP_1, TIMER_0,     PWM_TIMER_PRESCALE, pwmTC_Handler  }, // 2 - PWM
-  { TIMER_GROUP_1, TIMER_1,                      1, nullptr }, // 3
+  { TIMER_GROUP_1, TIMER_1,    TONE_TIMER_PRESCALE, toneTC_Handler }, // 3 - Tone
 };
 
 // ------------------------

Marlin/src/HAL/ESP32/timers.h

@@ -44,6 +44,9 @@ typedef uint64_t hal_timer_t;
 #ifndef PWM_TIMER_NUM
   #define PWM_TIMER_NUM         2  // index of timer to use for PWM outputs
 #endif
+#ifndef TONE_TIMER_NUM
+  #define TONE_TIMER_NUM        3  // index of timer for beeper tones
+#endif
 
 #define HAL_TIMER_RATE APB_CLK_FREQ // frequency of timer peripherals
 
@@ -59,6 +62,8 @@ typedef uint64_t hal_timer_t;
 
 #define STEP_TIMER_MIN_INTERVAL   8 // minimum time in µs between stepper interrupts
 
+#define TONE_TIMER_PRESCALE    1000 // Arbitrary value, no idea what i'm doing here
+
 #define TEMP_TIMER_PRESCALE    1000 // prescaler for setting Temp timer, 72Khz
 #define TEMP_TIMER_FREQUENCY   1000 // temperature interrupt frequency
 
@@ -90,11 +95,15 @@ typedef uint64_t hal_timer_t;
 #ifndef HAL_PWM_TIMER_ISR
   #define HAL_PWM_TIMER_ISR() extern "C" void pwmTC_Handler()
 #endif
+#ifndef HAL_TONE_TIMER_ISR
+  #define HAL_TONE_TIMER_ISR() extern "C" void toneTC_Handler()
+#endif
 
 extern "C" {
   void tempTC_Handler();
   void stepTC_Handler();
   void pwmTC_Handler();
+  void toneTC_Handler();
 }
 
 // ------------------------

platformio.ini

@@ -1483,12 +1483,13 @@ build_flags       = ${stm32_flash_drive.build_flags}
 # Espressif ESP32
 #
 [env:esp32]
-platform      = espressif32@1.11.2
+platform      = espressif32@2.1.0
 board         = esp32dev
 build_flags   = ${common.build_flags} -DCORE_DEBUG_LEVEL=0
 src_filter    = ${common.default_src_filter} +<src/HAL/ESP32>
 lib_ignore    = NativeEthernet
-upload_speed  = 115200
+upload_speed  = 500000
+monitor_speed = 250000
 #upload_port   = marlinesp.local
 #board_build.flash_mode = qio