init i2c

.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"]

.devcontainer/devcontainer.json

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+{
+	"name": "ESP-IDF QEMU",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
+	"customizations": {
+		"vscode": {
+			"settings": {
+				"terminal.integrated.defaultProfile.linux": "bash",
+				"idf.espIdfPath": "/opt/esp/idf",
+				"idf.toolsPath": "/opt/esp",
+				"idf.gitPath": "/usr/bin/git"
+			},
+			"extensions": [
+				"espressif.esp-idf-extension",
+				"espressif.esp-idf-web"
+			]
+		}
+	},
+	"runArgs": ["--privileged"]
+}

.gitignore

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+build/
+sdkconfig
+sdkconfig.old

.vscode/c_cpp_properties.json

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+{
+  "configurations": [
+    {
+      "name": "ESP-IDF",
+      "compilerPath": "${config:idf.toolsPath}/tools/xtensa-esp-elf/esp-14.2.0_20241119/xtensa-esp-elf/bin/xtensa-esp32-elf-gcc",
+      "compileCommands": "${config:idf.buildPath}/compile_commands.json",
+      "includePath": [
+        "${config:idf.espIdfPath}/components/**",
+        "${config:idf.espIdfPathWin}/components/**",
+        "${workspaceFolder}/**"
+      ],
+      "browse": {
+        "path": [
+          "${config:idf.espIdfPath}/components",
+          "${config:idf.espIdfPathWin}/components",
+          "${workspaceFolder}"
+        ],
+        "limitSymbolsToIncludedHeaders": true
+      }
+    }
+  ],
+  "version": 4
+}

.vscode/launch.json

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+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "gdbtarget",
+      "request": "attach",
+      "name": "Eclipse CDT GDB Adapter"
+    },
+    {
+      "type": "espidf",
+      "name": "Launch",
+      "request": "launch"
+    }
+  ]
+}

.vscode/settings.json

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+{
+  "C_Cpp.intelliSenseEngine": "default",
+  "idf.espIdfPath": "/home/sirian/esp/esp-idf",
+  "idf.pythonInstallPath": "/usr/bin/python3",
+  "idf.openOcdConfigs": [
+    "board/esp32-wrover-kit-3.3v.cfg"
+  ],
+  "idf.port": "/dev/ttyS0",
+  "idf.toolsPath": "/home/sirian/.espressif",
+  "idf.customExtraVars": {
+    "IDF_TARGET": "esp32"
+  }
+}

CMakeLists.txt

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+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(esp32_fun)

README.md

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+# _Sample project_
+
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
+
+This is the simplest buildable example. The example is used by command `idf.py create-project`
+that copies the project to user specified path and set it's name. For more information follow the [docs page](https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html#start-a-new-project)
+
+
+
+## How to use example
+We encourage the users to use the example as a template for the new projects.
+A recommended way is to follow the instructions on a [docs page](https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html#start-a-new-project).
+
+## Example folder contents
+
+The project **sample_project** contains one source file in C language [main.c](main/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
+├── main
+│   ├── CMakeLists.txt
+│   └── main.c
+└── README.md                  This is the file you are currently reading
+```
+Additionally, the sample project contains Makefile and component.mk files, used for the legacy Make based build system. 
+They are not used or needed when building with CMake and idf.py.

main/CMakeLists.txt

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

main/main.c

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+#include <stdio.h>
+#include "driver/i2c_master.h"
+
+#define I2C_SCL 1 /*FIXME*/
+#define I2C_SDA 2
+
+/* Docs: https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf */
+#define DISP_ADDRESS 0X3c
+#define I2C_FREQ 100000
+
+static i2c_master_dev_handle_t disp_handle;
+
+void init_i2c(void){
+    i2c_master_bus_config_t i2c_mst_config = {
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .i2c_port = I2C_PORT_NUM_0,
+        .scl_io_num = I2C_SCL,
+        .sda_io_num = I2C_SDA,
+        .glitch_ignore_cnt = 7,
+        .flags.enable_internal_pullup = true,
+    };
+
+    i2c_master_bus_handle_t bus_handle;
+    ESP_ERROR_CHECK(i2c_new_master_bus(&i2c_mst_config, &bus_handle));
+
+    i2c_device_config_t dev_cfg = {
+        .dev_addr_length = I2C_ADDR_BIT_LEN_7,
+        .device_address = DISP_ADDRESS,
+        .scl_speed_hz = I2C_FREQ,
+    };
+
+    ESP_ERROR_CHECK(i2c_master_bus_add_device(bus_handle, &dev_cfg, &disp_handle));
+
+
+}
+
+void i2c_disp_send_cmd(uint8_t cmd){
+    uint8_t data[2] = {0x00, cmd}; /*command mode*/
+    ESP_ERROR_CHECK(
+        i2c_master_transmit(disp_handle, data, sizeof(data), -1)
+    );
+}
+
+void init_display(void){
+
+}
+
+void app_main(void){
+    init_i2c();
+
+}