From 05762763e2b54b4d2f640575063942886bd2a46e Mon Sep 17 00:00:00 2001
From: Michael Ehrenreich <michideep@gmail.com>
Date: Fri, 24 Jun 2022 03:40:15 +0200
Subject: [PATCH] Allow controlling the buzzer from software

---
 main/CMakeLists.txt        |  2 ++
 main/buzzer.cpp            | 72 ++++++++++++++++++++++++++++++++++++++
 main/buzzer.h              |  7 ++++
 main/debuginputhandler.cpp |  4 +++
 main/main.cpp              |  3 ++
 5 files changed, 88 insertions(+)
 create mode 100644 main/buzzer.cpp
 create mode 100644 main/buzzer.h

diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 5227b44..87fed7f 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -48,6 +48,7 @@ set(headers
     bobbyschedulertask.h
     bobbytypesafeenum.h
     buildserver.h
+    buzzer.h
     can.h
     changevaluedisplay_bluetoothmode.h
     changevaluedisplay_bobbyquickactions.h
@@ -301,6 +302,7 @@ set(sources
     bobbyhupe.cpp
     bobbyquickactions.cpp
     buildserver.cpp
+    buzzer.cpp
     can.cpp
     changevaluedisplay_bluetoothmode.cpp
     changevaluedisplay_bobbyquickactions.cpp
diff --git a/main/buzzer.cpp b/main/buzzer.cpp
new file mode 100644
index 0000000..ef3b0cc
--- /dev/null
+++ b/main/buzzer.cpp
@@ -0,0 +1,72 @@
+/* LEDC (LED Controller) basic example
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+
+// esp-idf includes
+#include <esp_log.h>
+#include "driver/ledc.h"
+#include "esp_err.h"
+
+#include "buzzer.h"
+
+namespace buzzer
+{
+constexpr const char TAG[] = "BUZZER";
+
+#define LEDC_TIMER              LEDC_TIMER_0
+#define LEDC_MODE               LEDC_LOW_SPEED_MODE
+#define LEDC_OUTPUT_IO          (0) // Define the output GPIO
+#define LEDC_CHANNEL            LEDC_CHANNEL_0
+#define LEDC_DUTY_RES           LEDC_TIMER_13_BIT // Set duty resolution to 13 bits
+#define LEDC_DUTY               (4095) // Set duty to 50%. ((2 ** 13) - 1) * 50% = 4095
+#define LEDC_FREQUENCY          (4000) // Frequency in Hertz. Set frequency at 4 kHz
+
+void init()
+{
+    // Prepare and then apply the LEDC PWM timer configuration
+    ledc_timer_config_t ledc_timer = {
+        .speed_mode       = LEDC_MODE,
+        .duty_resolution  = LEDC_DUTY_RES,
+        .timer_num        = LEDC_TIMER,
+        .freq_hz          = LEDC_FREQUENCY,  // Set output frequency at 4 kHz
+        .clk_cfg          = LEDC_AUTO_CLK
+    };
+    if (auto result = ledc_timer_config(&ledc_timer) != ESP_OK) {
+        ESP_LOGW(TAG, "ledc_timer_config() failed with %s", esp_err_to_name(result));
+        return;
+    }
+
+    // Prepare and then apply the LEDC PWM channel configuration
+    ledc_channel_config_t ledc_channel = {
+        .gpio_num       = LEDC_OUTPUT_IO,
+        .speed_mode     = LEDC_MODE,
+        .channel        = LEDC_CHANNEL,
+        .intr_type      = LEDC_INTR_DISABLE,
+        .timer_sel      = LEDC_TIMER,
+        .duty           = 0, // Set duty to 0%
+        .hpoint         = 0
+    };
+    if (auto result = ledc_channel_config(&ledc_channel) != ESP_OK) {
+        ESP_LOGW(TAG, "ledc_channel_config() failed with %s", esp_err_to_name(result));
+        return;
+    }
+}
+
+void set_frequency(int frequency)
+{
+    if (frequency != 0)
+    {
+        ledc_set_freq(LEDC_MODE, LEDC_TIMER, frequency);
+        ledc_set_duty(LEDC_MODE, LEDC_CHANNEL, LEDC_DUTY);
+        ledc_update_duty(LEDC_MODE, LEDC_CHANNEL);
+    }
+    else
+    {
+        ledc_set_duty(LEDC_MODE, LEDC_CHANNEL, 0);
+        ledc_update_duty(LEDC_MODE, LEDC_CHANNEL);
+    }
+}
+}
diff --git a/main/buzzer.h b/main/buzzer.h
new file mode 100644
index 0000000..c19310e
--- /dev/null
+++ b/main/buzzer.h
@@ -0,0 +1,7 @@
+#pragma once
+
+namespace buzzer
+{
+void init();
+void set_frequency(int frequency);
+} // namespace buzzer
diff --git a/main/debuginputhandler.cpp b/main/debuginputhandler.cpp
index d82c104..79044fd 100644
--- a/main/debuginputhandler.cpp
+++ b/main/debuginputhandler.cpp
@@ -15,6 +15,7 @@
 #include <changevaluedisplay_string.h>
 
 // local includes
+#include "buzzer.h"
 #include "globals.h"
 #include "utils.h"
 #include "bobbybuttons.h"
@@ -22,6 +23,7 @@
 
 namespace {
 constexpr const char * const TAG = "DEBUG";
+constexpr int notes[] = {0, 523, 587, 659, 698, 784, 880, 988, 1047, 1175};
 
 uint8_t consoleControlCharsReceived{};
 bool uart0Initialized{};
@@ -155,6 +157,8 @@ void handleNormalChar(char c)
         case '9':
             for (Controller &controller : controllers)
                 controller.command.buzzer.freq = c-'0';
+            //buzzer::set_frequency(notes[c-'0']);
+            buzzer::set_frequency(500 * (c-'0'));
             break;
         case 'z':
         case 'Z':
diff --git a/main/main.cpp b/main/main.cpp
index ed1272a..028bd5b 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -38,6 +38,7 @@ using namespace std::chrono_literals;
 #include "displays/statusdisplay.h"
 #include "newsettings.h"
 #include "taskmanager.h"
+#include "buzzer.h"
 
 namespace {
 espchrono::millis_clock::time_point lastStatsPush;
@@ -155,6 +156,8 @@ extern "C" void app_main()
     esp_chip_info(&chip_info);
     esp_pm_get_configuration(&pm_config);
 
+    buzzer::init();
+
     while (true)
     {
         const auto now = espchrono::millis_clock::now();