Initial commit.

Signed-off-by: Yilin Sun <imi415@imi.moe>

.clang-format

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+BasedOnStyle: Google
+IndentWidth: 4
+AlignConsecutiveMacros: Consecutive
+AlignConsecutiveDeclarations: Consecutive
+AlignConsecutiveAssignments: Consecutive
+AllowShortFunctionsOnASingleLine: None
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterEnum: false
+  AfterStruct: false
+  SplitEmptyFunction: false
+ColumnLimit: 120

.drone.yml

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+---
+kind: pipeline
+type: docker
+name: Build
+
+steps:
+  - name: Submodules
+    image: alpine/git
+    commands:
+      - git submodule update --init --recursive
+
+  - name: IDF Build
+    image: "espressif/idf:v5.1"
+    commands:
+      - bash -c ". $IDF_PATH/export.sh && idf.py build && idf.py size-components"

.gitignore

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+/assets/.~lock*
+/build
+/cmake-build-*
+/sdkconfig
+/sdkconfig.old

CMakeLists.txt

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+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(hello_world)

README.md

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+| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-S2 | ESP32-S3 |
+| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- |
+
+# Hello World Example
+
+Starts a FreeRTOS task to print "Hello World".
+
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
+
+## How to use example
+
+Follow detailed instructions provided specifically for this example.
+
+Select the instructions depending on Espressif chip installed on your development board:
+
+- [ESP32 Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/stable/get-started/index.html)
+- [ESP32-S2 Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/get-started/index.html)
+
+
+## Example folder contents
+
+The project **hello_world** contains one source file in C language [hello_world_main.c](main/hello_world_main.c). The file is located in folder [main](main).
+
+ESP-IDF projects are built using CMake. The project build configuration is contained in `CMakeLists.txt` files that provide set of directives and instructions describing the project's source files and targets (executable, library, or both).
+
+Below is short explanation of remaining files in the project folder.
+
+```
+├── CMakeLists.txt
+├── pytest_hello_world.py      Python script used for automated testing
+├── main
+│   ├── CMakeLists.txt
+│   └── hello_world_main.c
+└── README.md                  This is the file you are currently reading
+```
+
+For more information on structure and contents of ESP-IDF projects, please refer to Section [Build System](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/build-system.html) of the ESP-IDF Programming Guide.
+
+## Troubleshooting
+
+* Program upload failure
+
+    * Hardware connection is not correct: run `idf.py -p PORT monitor`, and reboot your board to see if there are any output logs.
+    * The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
+
+## Technical support and feedback
+
+Please use the following feedback channels:
+
+* For technical queries, go to the [esp32.com](https://esp32.com/) forum
+* For a feature request or bug report, create a [GitHub issue](https://github.com/espressif/esp-idf/issues)
+
+We will get back to you as soon as possible.

main/CMakeLists.txt

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+idf_component_register(SRCS "hello_world_main.c"
+                    INCLUDE_DIRS "")

main/hello_world_main.c

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+/* FreeRTOS */
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+/* IDF components */
+#include "esp_log.h"
+
+static const char *LOG_TAG = "MAIN";
+
+void app_main(void) {
+    ESP_LOGI(LOG_TAG, "Hello world!");
+
+    for (;;) {
+        vTaskSuspend(NULL);
+    }
+}

sdkconfig.defaults

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+# Default target type
+CONFIG_IDF_TARGET="esp32c3"
+
+# Ai-Thinker uses ECO2 chip.
+CONFIG_ESP32C3_REV_MIN_2=y
+
+# Flash: 2MB QSPI
+CONFIG_ESPTOOLPY_FLASHMODE_QIO=y