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# The following lines of boilerplate have to be in your project's
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# CMakeLists in this exact order for cmake to work correctly
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cmake_minimum_required(VERSION 3.16)
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include($ENV{IDF_PATH}/tools/cmake/project.cmake)
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project(ethernet_hello)
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| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-H4 | ESP32-S2 | ESP32-S3 |
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| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- | -------- |
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# Hello World Example
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Starts a FreeRTOS task to print "Hello World".
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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## How to use example
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Follow detailed instructions provided specifically for this example.
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Select the instructions depending on Espressif chip installed on your development board:
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- [ESP32 Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/stable/get-started/index.html)
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- [ESP32-S2 Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/get-started/index.html)
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## Example folder contents
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The project **hello_world** contains one source file in C language [hello_world_main.c](main/main.c). The file is located in folder [main](main).
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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).
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Below is short explanation of remaining files in the project folder.
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```
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├── CMakeLists.txt
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├── pytest_hello_world.py Python script used for automated testing
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├── main
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│ ├── CMakeLists.txt
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│ └── hello_world_main.c
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└── README.md This is the file you are currently reading
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```
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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.
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## Troubleshooting
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* Program upload failure
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* Hardware connection is not correct: run `idf.py -p PORT monitor`, and reboot your board to see if there are any output logs.
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* The baud rate for downloading is too high: lower your baud rate in the `menuconfig` menu, and try again.
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## Technical support and feedback
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Please use the following feedback channels:
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* For technical queries, go to the [esp32.com](https://esp32.com/) forum
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* For a feature request or bug report, create a [GitHub issue](https://github.com/espressif/esp-idf/issues)
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We will get back to you as soon as possible.
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idf_component_register(SRCS "main.c"
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INCLUDE_DIRS "")
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/*
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* SPDX-FileCopyrightText: 2010-2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: CC0-1.0
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*/
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#include <stdio.h>
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#include <inttypes.h>
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#include "sdkconfig.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_chip_info.h"
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#include "esp_flash.h"
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void app_main(void)
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{
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printf("Hello world!\n");
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/* Print chip information */
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esp_chip_info_t chip_info;
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uint32_t flash_size;
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esp_chip_info(&chip_info);
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printf("This is %s chip with %d CPU core(s), WiFi%s%s%s, ",
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CONFIG_IDF_TARGET,
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chip_info.cores,
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(chip_info.features & CHIP_FEATURE_BT) ? "/BT" : "",
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(chip_info.features & CHIP_FEATURE_BLE) ? "/BLE" : "",
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(chip_info.features & CHIP_FEATURE_IEEE802154) ? ", 802.15.4 (Zigbee/Thread)" : "");
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unsigned major_rev = chip_info.revision / 100;
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unsigned minor_rev = chip_info.revision % 100;
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printf("silicon revision v%d.%d, ", major_rev, minor_rev);
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if(esp_flash_get_size(NULL, &flash_size) != ESP_OK) {
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printf("Get flash size failed");
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return;
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}
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printf("%" PRIu32 "MB %s flash\n", flash_size / (uint32_t)(1024 * 1024),
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(chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "embedded" : "external");
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printf("Minimum free heap size: %" PRIu32 " bytes\n", esp_get_minimum_free_heap_size());
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for (int i = 10; i >= 0; i--) {
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printf("Restarting in %d seconds...\n", i);
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vTaskDelay(1000 / portTICK_PERIOD_MS);
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}
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printf("Restarting now.\n");
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fflush(stdout);
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esp_restart();
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}
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