init

.gitignore

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+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+# esp-idf / CMake
+# build/*
+
+# platformio
+.DS_Store
+*/.DS_Store
+.travis.yml
+.pio/
+.pio/*

.gitmodules

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+[submodule "lib/ESP32-audioI2S"]
+	path = lib/ESP32-audioI2S
+	url = https://github.com/schreibfaul1/ESP32-audioI2S.git

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/ESP32-audioI2S

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+Subproject commit e294ca0e1e030bffbd247a99b9828c0734245040

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+board_build.f_flash = 80000000L
+board_build.flash_mode = dio
+upload_speed = 921600
+
+; to enable PSRAM
+;build_flags =
+;    -DBOARD_HAS_PSRAM
+;    -mfix-esp32-psram-cache-issue
+
+lib_deps =
+  adafruit/Adafruit SSD1306@^2.4.5
+  adafruit/Adafruit BusIO@^1.7.3
+  arkhipenko/TaskScheduler@^3.3.0

src/main.cpp

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+// simple player for all
+
+//============<audioooo-param>============
+#define GAIN_MAX 1.0 // if 1.0 is too loud, give max. limit here.
+//============<audioooo-param>============
+
+//============<parameters>============
+#define SCREEN_PERIOD (200) //200ms = 5hz
+#define MONITORING_SERIAL (Serial)
+//============</parameters>===========
+
+//arduino
+#include <Arduino.h>
+
+//task
+#include <TaskScheduler.h>
+Scheduler runner;
+
+//screen
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+#define MAKEPYTHON_ESP32_SDA 4
+#define MAKEPYTHON_ESP32_SCL 5
+#define SCREEN_WIDTH 128 // OLED display width, in pixels
+#define SCREEN_HEIGHT 64 // OLED display height, in pixels
+#define OLED_RESET -1    // Reset pin # (or -1 if sharing Arduino reset pin)
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
+
+//-*-*-*-*-*-*-*-*-*-*-*-*-
+// my tasks
+// audio & sd & filesystem
+#include "Audio.h"
+#include "SPI.h"
+#include "SD.h"
+#include "FS.h"
+//sdcard
+#define SD_CS 22
+#define SPI_MOSI 23
+#define SPI_MISO 19
+#define SPI_SCK 18
+//digital i/o used (for) makerfabs audio v2.0
+#define I2S_DOUT 27
+#define I2S_BCLK 26
+#define I2S_LRC 25
+Audio audio;
+
+//screen task
+String screen_filename = "/___.mp3";
+
+//
+extern Task screen_cmd_notify_task;
+bool cmd_notify = false;
+void screen_cmd_notify() {
+  if (screen_cmd_notify_task.isFirstIteration()) cmd_notify = true;
+  else if (screen_cmd_notify_task.isLastIteration()) cmd_notify = false;
+  else cmd_notify = !cmd_notify;
+}
+Task screen_cmd_notify_task(500, 10, &screen_cmd_notify, &runner, false);
+
+//
+extern Task screen_task;
+void screen() {
+  //clear screen + a
+  int line_step = 12;
+  int line = 0;
+  display.clearDisplay();
+  display.setTextColor(SSD1306_WHITE);
+  display.setTextSize(1);
+
+  //line1 - mode line (playing / stopped) + notify mark
+  display.setCursor(0, line);
+  if (audio.isRunning()) display.println("= playing ===");
+  else display.println("* stopped !:.");
+  if (cmd_notify) {
+    display.setCursor(120, line);
+    display.println("*");
+  }
+  line += line_step;
+
+  //line2 - filename
+  display.setCursor(0, line);
+  display.println(screen_filename.c_str());
+  line += line_step;
+
+  //
+  display.display();
+  //
+}
+Task screen_task(SCREEN_PERIOD, TASK_FOREVER, &screen, &runner, true);
+
+//audio files (wav & mp3)
+String file_list[100]; //<-- later change this to be a vector (variable length)
+int file_num = 0;
+int file_index = 0;
+int get_music_list(fs::FS &fs, const char *dirname, uint8_t levels, String wavlist[100])
+{
+  Serial.printf("Listing directory: %s\n", dirname);
+  int i = 0;
+
+  File root = fs.open(dirname);
+  if (!root) {
+    Serial.println("Failed to open directory");
+    return i;
+  }
+  if (!root.isDirectory()) {
+    Serial.println("Not a directory");
+    return i;
+  }
+
+  File file = root.openNextFile();
+  while (file) {
+    if (file.isDirectory()) { }
+    else {
+      String temp = file.name();
+      if (temp.endsWith(".wav")) {
+        wavlist[i] = temp;
+        i++;
+      } else if (temp.endsWith(".mp3")) {
+        wavlist[i] = temp;
+        i++;
+      }
+    }
+    file = root.openNextFile();
+  }
+  return i;
+}
+
+//on 'audio_eof' (automatically called by I2Saudio library at certain events)
+void audio_eof_mp3(const char *info)
+{
+  //get next
+  file_index++;
+  if (file_index >= file_num) file_index = 0;
+
+  //
+  audio.connecttoSD(file_list[file_index].c_str());
+  screen_filename = file_list[file_index];
+}
+
+void lcd_text(String str) {
+  display.clearDisplay();
+  display.setTextColor(SSD1306_WHITE);
+  display.setTextSize(1);
+  display.setCursor(0, 0);
+  display.println(str.c_str());
+  display.display();
+}
+
+//
+File root;
+void setup() {
+
+  //serial
+  Serial.begin(115200);
+  delay(100);
+
+  //screen
+  Wire.begin(MAKEPYTHON_ESP32_SDA, MAKEPYTHON_ESP32_SCL);
+  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
+  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x32
+    Serial.println(F("SSD1306 allocation failed"));
+    for (;;)
+      ;         // Don't proceed, loop forever
+  }
+  display.clearDisplay();
+
+  //SD(SPI)
+  pinMode(SD_CS, OUTPUT);
+  digitalWrite(SD_CS, HIGH);
+  SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
+  SPI.setFrequency(1000000);
+  if (!SD.begin(SD_CS, SPI)) {
+    Serial.println("Card Mount Failed");
+    lcd_text("SD ERR!\nCard Mount Failed!");
+    while (1)
+      ;
+  } else {
+    // lcd_text("SD OK");
+  }
+
+  //read SD
+  file_num = get_music_list(SD, "/", 0, file_list);
+  Serial.print("Music file count:");
+  Serial.println(file_num);
+  Serial.println("All music:");
+  for (int i = 0; i < file_num; i++) {
+    Serial.println(file_list[i]);
+  }
+
+  //audio(I2S)
+  audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
+  audio.setVolume(21);   // 0...21
+
+  //start playing..
+  file_index = 0;
+  audio.connecttoSD(file_list[file_index].c_str());
+
+  //
+  display.display();
+}
+
+void loop() {
+  //
+  audio.loop();
+  //
+  // runner.execute();
+  //
+}

test/README

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+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html