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code/01.start/hello_world/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)
code/01.start/hello_world/README.md
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| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | 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.
code/01.start/hello_world/main/CMakeLists.txt
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idf_component_register(SRCS "hello_world_main.c"
INCLUDE_DIRS "")
code/01.start/hello_world/main/hello_world_main.c
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/*
* 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();
}
code/01.start/hello_world/pytest_hello_world.py
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# SPDX-FileCopyrightText: 2022-2023 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_qemu.app import QemuApp
from pytest_embedded_qemu.dut import QemuDut
@pytest.mark.supported_targets
@pytest.mark.preview_targets
@pytest.mark.generic
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.linux
@pytest.mark.host_test
def test_hello_world_linux(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.esp32 # we only support qemu on esp32 for now
@pytest.mark.host_test
@pytest.mark.qemu
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!')
code/01.start/hello_world/sdkconfig.ci
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code/02.idf_basic/blink/CMakeLists.txt
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# 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 3.16)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(blink)
code/02.idf_basic/blink/main/CMakeLists.txt
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idf_component_register(SRCS "blink_example_main.c"
INCLUDE_DIRS ".")
code/02.idf_basic/blink/main/Kconfig.projbuild
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menu "Example Configuration"
orsource "$IDF_PATH/examples/common_components/env_caps/$IDF_TARGET/Kconfig.env_caps"
choice BLINK_LED
prompt "Blink LED type"
default BLINK_LED_GPIO
help
Select the LED type. A normal level controlled LED or an addressable LED strip.
The default selection is based on the Espressif DevKit boards.
You can change the default selection according to your board.
config BLINK_LED_GPIO
bool "GPIO"
config BLINK_LED_STRIP
bool "LED strip"
endchoice
choice BLINK_LED_STRIP_BACKEND
depends on BLINK_LED_STRIP
prompt "LED strip backend peripheral"
default BLINK_LED_STRIP_BACKEND_RMT if SOC_RMT_SUPPORTED
default BLINK_LED_STRIP_BACKEND_SPI
help
Select the backend peripheral to drive the LED strip.
config BLINK_LED_STRIP_BACKEND_RMT
depends on SOC_RMT_SUPPORTED
bool "RMT"
config BLINK_LED_STRIP_BACKEND_SPI
bool "SPI"
endchoice
config BLINK_GPIO
int "Blink GPIO number"
range ENV_GPIO_RANGE_MIN ENV_GPIO_OUT_RANGE_MAX
default 8
help
GPIO number (IOxx) to blink on and off the LED.
Some GPIOs are used for other purposes (flash connections, etc.) and cannot be used to blink.
config BLINK_PERIOD
int "Blink period in ms"
range 10 3600000
default 1000
help
Define the blinking period in milliseconds.
endmenu
code/02.idf_basic/blink/main/blink_example_main.c
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/* Blink Example
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "led_strip.h"
#include "sdkconfig.h"
static const char *TAG = "example";
/* Use project configuration menu (idf.py menuconfig) to choose the GPIO to blink,
or you can edit the following line and set a number here.
*/
#define BLINK_GPIO CONFIG_BLINK_GPIO
static uint8_t s_led_state = 0;
#ifdef CONFIG_BLINK_LED_STRIP
static led_strip_handle_t led_strip;
static void blink_led(void)
{
/* If the addressable LED is enabled */
if (s_led_state) {
/* Set the LED pixel using RGB from 0 (0%) to 255 (100%) for each color */
led_strip_set_pixel(led_strip, 0, 16, 16, 16);
/* Refresh the strip to send data */
led_strip_refresh(led_strip);
} else {
/* Set all LED off to clear all pixels */
led_strip_clear(led_strip);
}
}
static void configure_led(void)
{
ESP_LOGI(TAG, "Example configured to blink addressable LED!");
/* LED strip initialization with the GPIO and pixels number*/
led_strip_config_t strip_config = {
.strip_gpio_num = BLINK_GPIO,
.max_leds = 1, // at least one LED on board
};
#if CONFIG_BLINK_LED_STRIP_BACKEND_RMT
led_strip_rmt_config_t rmt_config = {
.resolution_hz = 10 * 1000 * 1000, // 10MHz
.flags.with_dma = false,
};
ESP_ERROR_CHECK(led_strip_new_rmt_device(&strip_config, &rmt_config, &led_strip));
#elif CONFIG_BLINK_LED_STRIP_BACKEND_SPI
led_strip_spi_config_t spi_config = {
.spi_bus = SPI2_HOST,
.flags.with_dma = true,
};
ESP_ERROR_CHECK(led_strip_new_spi_device(&strip_config, &spi_config, &led_strip));
#else
#error "unsupported LED strip backend"
#endif
/* Set all LED off to clear all pixels */
led_strip_clear(led_strip);
}
#elif CONFIG_BLINK_LED_GPIO
static void blink_led(void)
{
/* Set the GPIO level according to the state (LOW or HIGH)*/
gpio_set_level(BLINK_GPIO, s_led_state);
}
static void configure_led(void)
{
ESP_LOGI(TAG, "Example configured to blink GPIO LED!");
gpio_reset_pin(BLINK_GPIO);
/* Set the GPIO as a push/pull output */
gpio_set_direction(BLINK_GPIO, GPIO_MODE_OUTPUT);
}
#else
#error "unsupported LED type"
#endif
void app_main(void)
{
/* Configure the peripheral according to the LED type */
configure_led();
while (1) {
ESP_LOGI(TAG, "Turning the LED %s!", s_led_state == true ? "ON" : "OFF");
blink_led();
/* Toggle the LED state */
s_led_state = !s_led_state;
vTaskDelay(CONFIG_BLINK_PERIOD / portTICK_PERIOD_MS);
}
}
code/02.idf_basic/blink/main/idf_component.yml
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dependencies:
espressif/led_strip: "^2.4.1"
code/02.idf_basic/blink/sdkconfig.defaults
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CONFIG_BLINK_LED_GPIO=y
CONFIG_BLINK_GPIO=8
code/02.idf_basic/sample_project/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 3.16)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(main)
code/02.idf_basic/sample_project/README.md
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| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- | -------- |
# _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.
code/02.idf_basic/sample_project/main/CMakeLists.txt
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idf_component_register(SRCS "main.c"
INCLUDE_DIRS ".")
code/02.idf_basic/sample_project/main/main.c
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#include <stdio.h>
void app_main(void)
{
}