From e1d49a3632ac130bc5f46b4171202b3ce0a6c1f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20G=C3=B6ttgens?= <tgoettgens@gmail.com>
Date: Tue, 10 May 2022 11:07:49 +0200
Subject: [PATCH] Buzzer Support for M5Stack

---
 src/buzz/buzz.cpp                    | 18 +++++++++++++++
 variants/m5stack_core/Speaker.cpp    | 33 ++++++++++++++++++++++++++++
 variants/m5stack_core/Speaker.h      | 30 +++++++++++++++++++++++++
 variants/m5stack_core/platformio.ini |  5 ++++-
 variants/m5stack_core/variant.h      |  7 +++---
 5 files changed, 89 insertions(+), 4 deletions(-)
 create mode 100644 variants/m5stack_core/Speaker.cpp
 create mode 100644 variants/m5stack_core/Speaker.h

diff --git a/src/buzz/buzz.cpp b/src/buzz/buzz.cpp
index 279c6484..3253684d 100644
--- a/src/buzz/buzz.cpp
+++ b/src/buzz/buzz.cpp
@@ -8,8 +8,13 @@ void playBeep(){};
 void playStartMelody(){};
 void playShutdownMelody(){};
 
+#else
+#ifdef M5STACK
+#include "Speaker.h"
+TONE Tone;
 #else
 #include "Tone.h"
+#endif
 
 extern "C" void delay(uint32_t dwMs);
 
@@ -38,13 +43,26 @@ const int DURATION_1_4 = 250;  // 1/4 note
 void playTones(const ToneDuration *tone_durations, int size) {
   for (int i = 0; i < size; i++) {
     const auto &tone_duration = tone_durations[i];
+#ifdef M5STACK
+    Tone.tone(tone_duration.frequency_khz);
+    delay(tone_duration.duration_ms);
+    Tone.mute();
+#else
     tone(PIN_BUZZER, tone_duration.frequency_khz, tone_duration.duration_ms);
+#endif
     // to distinguish the notes, set a minimum time between them.
     delay(1.3 * tone_duration.duration_ms);
   }
 }
 
+#ifdef M5STACK
+void playBeep() {
+  ToneDuration melody[] = {{NOTE_B3, DURATION_1_4}};
+  playTones(melody, sizeof(melody) / sizeof(ToneDuration));
+}
+#else
 void playBeep() { tone(PIN_BUZZER, NOTE_B3, DURATION_1_4); }
+#endif
 
 void playStartMelody() {
   ToneDuration melody[] = {{NOTE_B3, DURATION_1_4},
diff --git a/variants/m5stack_core/Speaker.cpp b/variants/m5stack_core/Speaker.cpp
new file mode 100644
index 00000000..0aaff123
--- /dev/null
+++ b/variants/m5stack_core/Speaker.cpp
@@ -0,0 +1,33 @@
+#include "Speaker.h"
+
+TONE::TONE(void) {
+  _volume = 5;
+  _begun = false;
+}
+
+void TONE::begin() {
+  _begun = true;
+  ledcSetup(TONE_PIN_CHANNEL, 0, 13);
+  ledcAttachPin(PIN_BUZZER, TONE_PIN_CHANNEL);
+}
+
+void TONE::end() {
+  mute();
+  ledcDetachPin(PIN_BUZZER);
+  _begun = false;
+}
+
+void TONE::tone(uint16_t frequency) {
+  if(!_begun) begin();
+  ledcWriteTone(TONE_PIN_CHANNEL, frequency);
+  ledcWrite(TONE_PIN_CHANNEL, 0x400 >> _volume);
+}
+
+void TONE::setVolume(uint8_t volume) {
+  _volume = 11 - volume;
+}
+
+void TONE::mute() {
+  ledcWriteTone(TONE_PIN_CHANNEL, 0);
+  digitalWrite(PIN_BUZZER, 0);
+}
\ No newline at end of file
diff --git a/variants/m5stack_core/Speaker.h b/variants/m5stack_core/Speaker.h
new file mode 100644
index 00000000..2ab877d9
--- /dev/null
+++ b/variants/m5stack_core/Speaker.h
@@ -0,0 +1,30 @@
+#ifndef _SPEAKER_H_
+  #define _SPEAKER_H_
+
+  #include "configuration.h"
+
+  #ifdef __cplusplus
+    extern "C"
+    {
+  #endif /* __cplusplus */
+  #include "esp32-hal-dac.h"
+  #ifdef __cplusplus
+    }
+  #endif /* __cplusplus */
+
+  class TONE {
+    public:
+      TONE(void);
+
+      void begin();
+      void end();
+      void mute();
+      void tone(uint16_t frequency);
+      void setVolume(uint8_t volume);
+
+    private:
+      uint8_t _volume;
+      bool _begun;
+      bool speaker_on;
+  };
+#endif
diff --git a/variants/m5stack_core/platformio.ini b/variants/m5stack_core/platformio.ini
index dffba3d2..69b9eb92 100644
--- a/variants/m5stack_core/platformio.ini
+++ b/variants/m5stack_core/platformio.ini
@@ -4,6 +4,9 @@ board = m5stack-core-esp32
 upload_port = COM8
 monitor_port = COM8
 monitor_filters = esp32_exception_decoder
+src_filter = 
+  ${esp32_base.src_filter}
+  +<../variants/m5stack_core>
 build_flags = 
   ${esp32_base.build_flags} -D PRIVATE_HW -I variants/m5stack_core
   -DILI9341_DRIVER
@@ -24,4 +27,4 @@ lib_ignore =
   m5stack-core
 lib_deps = 
   ${esp32_base.lib_deps}
-  bodmer/TFT_eSPI@^2.4.61
+  bodmer/TFT_eSPI@^2.4.61
\ No newline at end of file
diff --git a/variants/m5stack_core/variant.h b/variants/m5stack_core/variant.h
index f8069526..0fd294c6 100644
--- a/variants/m5stack_core/variant.h
+++ b/variants/m5stack_core/variant.h
@@ -10,6 +10,9 @@
 
 #define BUTTON_PIN 38
 
+#define PIN_BUZZER 25
+#define TONE_PIN_CHANNEL 0
+
 #undef RF95_SCK
 #undef RF95_MISO
 #undef RF95_MOSI
@@ -32,11 +35,9 @@
 #define GPS_RX_PIN 16
 #define GPS_TX_PIN 17
 
-#define NO_GPS
-
 // Define if screen should be mirrored left to right
 #define SCREEN_ROTATE
 
 // LCD screens are slow, so slowdown the wipe so it looks better
 #define SCREEN_TRANSITION_MSECS 1
-#define SCREEN_TRANSITION_FRAMERATE 1 // fps
\ No newline at end of file
+#define SCREEN_TRANSITION_FRAMERATE 1 // fps