commit 71656a9584ca7983e67ef9054455b2f595b7632d
Author: Mitchell M <mitchoah@gmail.com>
Date:   Sat Mar 21 20:05:13 2026 -0500

    init

diff --git a/.clangd b/.clangd
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--- /dev/null
+++ b/.clangd
@@ -0,0 +1,2 @@
+CompileFlags:
+    Remove: [-f*, -m*]
diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
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index 0000000..dafb8ad
--- /dev/null
+++ b/.devcontainer/Dockerfile
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+ARG DOCKER_TAG=latest
+FROM espressif/idf:${DOCKER_TAG}
+
+ENV LC_ALL=C.UTF-8
+ENV LANG=C.UTF-8
+
+RUN apt-get update -y && apt-get install udev -y
+
+RUN echo "source /opt/esp/idf/export.sh > /dev/null 2>&1" >> ~/.bashrc
+
+ENTRYPOINT [ "/opt/esp/entrypoint.sh" ]
+
+CMD ["/bin/bash", "-c"]
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diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
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index 0000000..246b79f
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,19 @@
+{
+	"name": "ESP-IDF QEMU",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
+	"customizations": {
+		"vscode": {
+			"settings": {
+				"terminal.integrated.defaultProfile.linux": "bash",
+				"idf.gitPath": "/usr/bin/git"
+			},
+			"extensions": [
+				"espressif.esp-idf-extension",
+				"espressif.esp-idf-web"
+			]
+		}
+	},
+	"runArgs": ["--privileged"]
+}
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diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7805557
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,78 @@
+# macOS
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Directory metadata
+.directory
+
+# Temporary files
+*~
+*.swp
+*.swo
+*.bak
+*.tmp
+
+# Log files
+*.log
+
+# Build artifacts and directories
+**/build/
+build/
+*.o
+*.a
+*.out
+*.exe # For any host-side utilities compiled on Windows
+
+# ESP-IDF specific build outputs
+*.bin
+*.elf
+*.map
+flasher_args.json # Generated in build directory
+sdkconfig.old
+sdkconfig
+
+# ESP-IDF dependencies
+# For older versions or manual component management
+/components/.idf/
+**/components/.idf/
+# For modern ESP-IDF component manager
+managed_components/
+# If ESP-IDF tools are installed/referenced locally to the project
+.espressif/
+
+# CMake generated files
+CMakeCache.txt
+CMakeFiles/
+cmake_install.cmake
+install_manifest.txt
+CTestTestfile.cmake
+
+# Python environment files
+*.pyc
+*.pyo
+*.pyd
+__pycache__/
+*.egg-info/
+dist/
+
+# Virtual environment folders
+venv/
+.venv/
+env/
+
+# Language Servers
+.clangd/
+.ccls-cache/
+compile_commands.json
+
+# Windows specific
+Thumbs.db
+ehthumbs.db
+Desktop.ini
+
+# User-specific configuration files
+*.user
+*.workspace # General workspace files, can be from various tools
+*.suo       # Visual Studio Solution User Options
+*.sln.docstates # Visual Studio
diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
new file mode 100644
index 0000000..c56bbd1
--- /dev/null
+++ b/.vscode/c_cpp_properties.json
@@ -0,0 +1,19 @@
+{
+  "configurations": [
+    {
+      "name": "ESP-IDF",
+      "compilerPath": "/home/mitchell/.espressif/tools/xtensa-esp-elf/esp-14.2.0_20251107/xtensa-esp-elf/bin/xtensa-esp32s3-elf-gcc",
+      "compileCommands": "${config:idf.buildPath}/compile_commands.json",
+      "includePath": [
+        "${workspaceFolder}/**"
+      ],
+      "browse": {
+        "path": [
+          "${workspaceFolder}"
+        ],
+        "limitSymbolsToIncludedHeaders": true
+      }
+    }
+  ],
+  "version": 4
+}
diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..3694ae4
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,10 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "gdbtarget",
+      "request": "attach",
+      "name": "Eclipse CDT GDB Adapter"
+    }
+  ]
+}
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diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..9b252d7
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,17 @@
+{
+  "C_Cpp.intelliSenseEngine": "default",
+  "idf.openOcdConfigs": [
+    "board/esp32s3-builtin.cfg"
+  ],
+  "idf.port": "detect",
+  "idf.currentSetup": "/home/mitchell/.espressif/v6.0/esp-idf",
+  "idf.customExtraVars": {
+    "IDF_TARGET": "esp32s3"
+  },
+  "clangd.path": "/home/mitchell/.espressif/tools/esp-clang/esp-19.1.2_20250312/esp-clang/bin/clangd",
+  "clangd.arguments": [
+    "--background-index",
+    "--query-driver=**",
+    "--compile-commands-dir=/home/mitchell/cpp/blk_box_control/build"
+  ]
+}
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
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--- /dev/null
+++ b/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 3.22)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+# "Trim" the build. Include the minimal set of components, main, and anything it depends on.
+idf_build_set_property(MINIMAL_BUILD ON)
+project(blk_box_control)
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f3aa0c5
--- /dev/null
+++ b/README.md
@@ -0,0 +1,53 @@
+| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-H21 | ESP32-H4 | ESP32-P4 | ESP32-S2 | ESP32-S3 | Linux |
+| ----------------- | ----- | -------- | -------- | -------- | -------- | --------- | -------- | --------- | -------- | -------- | -------- | -------- | ----- |
+
+# 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.
diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
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index 0000000..28ab405
--- /dev/null
+++ b/main/CMakeLists.txt
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+idf_component_register(SRCS "hello_world_main.c"
+                       PRIV_REQUIRES spi_flash
+                       INCLUDE_DIRS "")
diff --git a/main/hello_world_main.c b/main/hello_world_main.c
new file mode 100644
index 0000000..7010f3e
--- /dev/null
+++ b/main/hello_world_main.c
@@ -0,0 +1,52 @@
+/*
+ * SPDX-FileCopyrightText: 2010-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+#include "sdkconfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_chip_info.h"
+#include "esp_flash.h"
+#include "esp_system.h"
+
+void app_main(void)
+{
+    printf("Hello world!\n");
+
+    /* Print chip information */
+    esp_chip_info_t chip_info;
+    uint32_t flash_size;
+    esp_chip_info(&chip_info);
+    printf("This is %s chip with %d CPU core(s), %s%s%s%s, ",
+           CONFIG_IDF_TARGET,
+           chip_info.cores,
+           (chip_info.features & CHIP_FEATURE_WIFI_BGN) ? "WiFi/" : "",
+           (chip_info.features & CHIP_FEATURE_BT) ? "BT" : "",
+           (chip_info.features & CHIP_FEATURE_BLE) ? "BLE" : "",
+           (chip_info.features & CHIP_FEATURE_IEEE802154) ? ", 802.15.4 (Zigbee/Thread)" : "");
+
+    unsigned major_rev = chip_info.revision / 100;
+    unsigned minor_rev = chip_info.revision % 100;
+    printf("silicon revision v%d.%d, ", major_rev, minor_rev);
+    if(esp_flash_get_size(NULL, &flash_size) != ESP_OK) {
+        printf("Get flash size failed");
+        return;
+    }
+
+    printf("%" PRIu32 "MB %s flash\n", flash_size / (uint32_t)(1024 * 1024),
+           (chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "embedded" : "external");
+
+    printf("Minimum free heap size: %" PRIu32 " bytes\n", esp_get_minimum_free_heap_size());
+
+    for (int i = 10; i >= 0; i--) {
+        printf("Restarting in %d seconds...\n", i);
+        vTaskDelay(1000 / portTICK_PERIOD_MS);
+    }
+    printf("Restarting now.\n");
+    fflush(stdout);
+    esp_restart();
+}
diff --git a/pytest_hello_world.py b/pytest_hello_world.py
new file mode 100644
index 0000000..64f6bb8
--- /dev/null
+++ b/pytest_hello_world.py
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+# SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: CC0-1.0
+import hashlib
+import logging
+from typing import Callable
+
+import pytest
+from pytest_embedded_idf.dut import IdfDut
+from pytest_embedded_idf.utils import idf_parametrize
+from pytest_embedded_qemu.app import QemuApp
+from pytest_embedded_qemu.dut import QemuDut
+
+
+@pytest.mark.generic
+@idf_parametrize('target', ['supported_targets', 'preview_targets'], indirect=['target'])
+def test_hello_world(dut: IdfDut, log_minimum_free_heap_size: Callable[..., None]) -> None:
+    dut.expect('Hello world!')
+    log_minimum_free_heap_size()
+
+
+@pytest.mark.host_test
+@idf_parametrize('target', ['linux'], indirect=['target'])
+def test_hello_world_linux(dut: IdfDut) -> None:
+    dut.expect('Hello world!')
+
+
+@pytest.mark.host_test
+@pytest.mark.macos
+@idf_parametrize('target', ['linux'], indirect=['target'])
+def test_hello_world_macos(dut: IdfDut) -> None:
+    dut.expect('Hello world!')
+
+
+def verify_elf_sha256_embedding(app: QemuApp, sha256_reported: str) -> None:
+    sha256 = hashlib.sha256()
+    with open(app.elf_file, 'rb') as f:
+        sha256.update(f.read())
+    sha256_expected = sha256.hexdigest()
+
+    logging.info(f'ELF file SHA256: {sha256_expected}')
+    logging.info(f'ELF file SHA256 (reported by the app): {sha256_reported}')
+
+    # the app reports only the first several hex characters of the SHA256, check that they match
+    if not sha256_expected.startswith(sha256_reported):
+        raise ValueError('ELF file SHA256 mismatch')
+
+
+@pytest.mark.host_test
+@pytest.mark.qemu
+@idf_parametrize('target', ['esp32', 'esp32c3'], indirect=['target'])
+def test_hello_world_host(app: QemuApp, dut: QemuDut) -> None:
+    sha256_reported = dut.expect(r'ELF file SHA256:\s+([a-f0-9]+)').group(1).decode('utf-8')
+    verify_elf_sha256_embedding(app, sha256_reported)
+
+    dut.expect('Hello world!')
diff --git a/sdkconfig.ci b/sdkconfig.ci
new file mode 100644
index 0000000..e69de29