Part 1: Build System

.gitignore

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+sdkconfig
+

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5)
+
+set(EXTRA_COMPONENT_DIRS "src")
+set(COMPONENTS "esptool_py src")
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+project(game)
+

LICENSE

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+MIT License
+
+Copyright (c) 2020 Austin Morlan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# Embedded Game Programming
+
+* Get the [ESP-IDF v4.0](https://github.com/espressif/esp-idf/releases/tag/v4.0)
+	* Follow Steps 1 through 3 of the [Documentation](https://docs.espressif.com/projects/esp-idf/en/v4.0/get-started/index.html#step-1-install-prerequisites)
+* Modify the `export.sh` script in this directory and fill out `IDF_PATH` and `IDF_TOOLS_PATH`
+	* `IDF_PATH` is the extracted ESP-IDF
+	* `IDF_TOOLS_PATH` is the path to the toolchain
+* `source export.sh`
+

export.sh

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+#!/usr/bin/env bash
+
+IDF_PATH=
+IDF_TOOLS_PATH=
+
+
+if [ -z "$IDF_PATH" ]
+then
+	echo "IDF_PATH not set"
+	return
+fi
+
+if [ -z "$IDF_TOOLS_PATH" ]
+then
+	echo "IDF_TOOLS_PATH not set"
+	return
+fi
+
+
+export IDF_PATH
+export IDF_TOOLS_PATH
+
+source $IDF_PATH/export.sh
+

sdkconfig.defaults

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+# Set flash size to 16MB
+CONFIG_ESPTOOLPY_FLASHSIZE_16MB=y
+
+# Set CPU frequency to 80MHz
+CONFIG_ESP32_DEFAULT_CPU_FREQ_80=y
+
+# Enable SPI RAM and allocate with heap_caps_malloc()
+CONFIG_ESP32_SPIRAM_SUPPORT=y
+CONFIG_SPIRAM_USE_CAPS_ALLOC=y
+
+# Enable optimizations
+CONFIG_COMPILER_OPTIMIZATION_LEVEL_RELEASE=y
+

src/CMakeLists.txt

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+idf_component_register(
+	SRCS "main.c"
+	INCLUDE_DIRS ""
+	PRIV_REQUIRES "")
+

src/main.c

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+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <stdio.h>
+
+
+void app_main(void)
+{
+	for (;;)
+	{
+		printf("Hello World!\n");
+		vTaskDelay(1000 / portTICK_PERIOD_MS);
+	}
+
+	// Should never get here
+	esp_restart();
+}