ESP-IDFでESP32の開発をはじめよう！

$ brew install cmake

$ mkdir esp
$ cd ~/esp 
$ git clone https://github.com/espressif/esp-idf.git

$ cd ~/esp/esp-idf
$ ./install.sh

Installing collected packages: six, MarkupSafe, Werkzeug, urllib3, python-engineio, Jinja2, itsdangerous, idna, click, charset-normalizer, certifi, requests, python-socketio, pycparser, greenlet, Flask, contextlib2, brotli, tqdm, semantic-version, schema, requests-toolbelt, pyyaml, Pygments, pygdbmi, gevent, future, Flask-SocketIO, Flask-Compress, cffi, reedsolo, pyserial, pyparsing, pyelftools, kconfiglib, idf-component-manager, gdbgui, ecdsa, cryptography, construct, bitstring
Successfully installed Flask-0.12.5 Flask-Compress-1.10.1 Flask-SocketIO-2.9.6 Jinja2-3.0.1 MarkupSafe-2.0.1 Pygments-2.10.0 Werkzeug-0.16.1 bitstring-3.1.9 brotli-1.0.9 certifi-2021.5.30 cffi-1.14.6 charset-normalizer-2.0.4 click-8.0.1 construct-2.10.54 contextlib2-21.6.0 cryptography-3.4.8 ecdsa-0.17.0 future-0.18.2 gdbgui-0.13.2.0 gevent-1.5.0 greenlet-1.1.1 idf-component-manager-0.2.100b0 idna-3.2 itsdangerous-2.0.1 kconfiglib-13.7.1 pycparser-2.20 pyelftools-0.27 pygdbmi-0.9.0.2 pyparsing-2.3.1 pyserial-3.5 python-engineio-3.14.2 python-socketio-4.6.1 pyyaml-5.4.1 reedsolo-1.5.4 requests-2.26.0 requests-toolbelt-0.9.1 schema-0.7.4 semantic-version-2.8.5 six-1.16.0 tqdm-4.62.2 urllib3-1.26.6
All done! You can now run:

  . ./export.sh

$ . ./export.sh

Setting IDF_PATH to '/Users/xxxxx/esp/esp-idf'
Detecting the Python interpreter
Checking "python" ...
Checking "python3" ...
Python 3.9.4
"python3" has been detected
Adding ESP-IDF tools to PATH...
Using Python interpreter in /Users/xxxxx/.espressif/python_env/idf4.4_py3.9_env/bin/python
Checking if Python packages are up to date...
Python requirements from /Users/xxxxx/esp/esp-idf/requirements.txt are satisfied.
Updated PATH variable:

...

Done! You can now compile ESP-IDF projects.
Go to the project directory and run:

  idf.py build

$ cd ~/esp
$ cp -r $IDF_PATH/examples/get-started/hello_world .

/* Hello World 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 "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_spi_flash.h"

void app_main(void)
{
    printf("Hello world!\n");

    /* Print chip information */
    esp_chip_info_t chip_info;
    esp_chip_info(&chip_info);
    printf("This is %s chip with %d CPU core(s), WiFi%s%s, ",
            CONFIG_IDF_TARGET,
            chip_info.cores,
            (chip_info.features & CHIP_FEATURE_BT) ? "/BT" : "",
            (chip_info.features & CHIP_FEATURE_BLE) ? "/BLE" : "");

    printf("silicon revision %d, ", chip_info.revision);

    printf("%dMB %s flash\n", spi_flash_get_chip_size() / (1024 * 1024),
            (chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "embedded" : "external");

    printf("Minimum free heap size: %d 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();
}

$ ls /dev/cu.*

$ cd ~/esp/hello_world
$ idf.py set-target esp32

$ idf.py build

$ idf.py -p /dev/cu.usbserial-0001 flash

$ idf.py -p /dev/cu.usbserial-0001 monitor

Hello world!
This is esp32 chip with 2 CPU core(s), WiFi/BT/BLE, silicon revision 1, 2MB external flash
Minimum free heap size: 294448 bytes
Restarting in 10 seconds...
Restarting in 9 seconds...
Restarting in 8 seconds...