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This article will explain in detail how to build a RT-Thread development environment on the ESP32 development board under the Linux system. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

1. Building steps

The following steps take the English version of Ubuntu 16.04 LTS 32bit as an example, other Linux systems are similar, but do not rule out minor differences (such as package management software yum, etc.).

Download ESP32 need to use USB serial port tool, please make sure your own open board (ESP-DevkitC, NodeMCU-32S) integrated with USB serial port function, or use USB to serial port tool, Linux serial port descriptor default is / dev/ttyUSB0, if you are not using the serial port is / dev/ttyUSB0, please modify the path when burning.

In the following example, the name of the linux user is ss. Replace it with the user name of your own linux. In addition, the project and compilation tools are placed in the user's root directory, and you can set them to the appropriate location according to your actual situation.

It has been tested in the following git project versions of Xiong Da, and it is not ruled out that the latest version has been improved:

Commit a8504d523214ee872ae480106e31cd1db138b74f

Author: Bernard Xiong

Date: Fri Aug 25 15 2936 2017 + 0800

1.1. Download the cross compilation tool

Cd ~

Wget https://dl.espressif.com/dl/xtensa-esp32-elf-linux32-1.22.0-61-gab8375a-5.2.0.tar.gz

1.2. Decompression cross-compilation tool

Tar-xzf xtensa-esp32-elf-linux32-1.22.0-61-gab8375a-5.2.0.tar.gz

1.3. Install the necessary software

Sudo apt-get install git wget make libncurses-devflex bison gperf python python-serial scons

1.4. Get the code

Cd ~

Git clone https://github.com/BernardXiong/rtthread-esp-idf

Cd rtthread-esp-idf

Git submodule init

Git submodule update

Cd esp-idf-port/esp-idf

Git submodule init

Git submodule update

Git apply.. / 0001-cpu_start-patch.patch

Git apply.. / 0002-add-esp_task.h.patch

Git apply.. / 0003-add-memset-to-0.patch

1.5. Modify the path of the cross-compilation tool in the project

Modify the path of exec_path in ~ / rtthread-esp-idf/rtconfig.py to:

EXEC_PATH = "homebank", "homebank", "xtensaure", "esp32", "Murelfbin'".

Note the ss in the path is the user name of the current user of linux

1.6. Compile

First, modify a small error in Makefile. The command path of the python line needs to be modified:

Pythonesp-idf-port/esp-idf/components/esptool_py/esptool/esptool.py-chip esp32elf2image-flash_mode "dio"-flash_freq "40m"-flash_size "4MB"-ortthread.bin rtthread-esp32.elf

Then go to the root directory of the project to compile

Cd ~ / rtthread-esp-idf

Make all

1.7. download

1) since ordinary users under Linux do not have the permission to directly operate / dev/ttyUSB0, first add appropriate permissions to the current user, so that when burning and writing later, there is no need to use sudo permission:

Sudo usermod-aG dialout ss

Note: ss is the user name of the current user of linux

After the setup is complete, log out and log back in to the current user, after which you no longer need to execute the command.

2) modify the name of the serial port (/ dev/ttyUSB0) in ~ / rtthread-esp-idf/burn_flash.bat to the following:

Python esp-idf-port/esp-idf/components/esptool_py/esptool/esptool.py--chip esp32-port/ dev/ttyUSB0-baud 115200-before "default_reset"-after "hard_reset" write_flash-z--flash_mode "dio"-flash_freq "40m"-flash_size detect0x1000 bootloader.bin 0x10000 rtthread.bin 0x8000 partitions_singleapp.bin

3) set the execution permission for burn_flash.bat:

Chmod a+xburn_flash.bat

4) connect the development board to the computer (if it is a virtual machine, you need to connect the settings to the virtual machine). At the same time, if the development board does not support one-click write function, you generally need to press the key to put it into burn mode (press IO0 and reset at the same time, then release reset first, and then release IO0)

5) execute the command and wait for the burning to be completed:

Cd ~ / rtthread-esp-idf

. / burn_flash.bat

(Porter rate: 115200)

two。 Other instructions 2.1. Cross-compilation tools for Linux64bit, Windows and macos

For more information, see https://github.com/BernardXiong/rtthread-esp-idf, where there are download paths for other system cross-compilation tools.

Note: under windows, you need to install GNU-compatible environment software such as MSYS2.

2.2. Catalogue and document description

The following figure shows the directory structure of rttthread-esp-idf:

Where:

The application directory is the code for the rtt application, where app_main () in main.c is the application entry function. You can modify and code here to familiarize yourself with and debug rtt programs.

The build directory is the directory used to compile intermediate files, and the compiled .o. D and so on are all in this directory.

The componets directory is the directory where the rtt component code is saved, and the components you write yourself can be placed here.

Doc provides an introduction to the use and features of the project.

The drivers directory is the directory saved by rtt for the related code of the portable driver, including uart, gpio, i2C, psram and so on.

The esp-idf-port directory is the modified code directory for esp-idf migration, because rtt on esp32 is based on esp's official esp-idf migration, esp-idf code and migration patches are in this directory. At the same time, python toolkits for downloading and packaging images are also in this directory. If you need to use ESP32 more deeply (such as using a custom partition structure, using FlashEncryption, etc.), you may need to configure changes in this directory.

Rt-thread is the rtt core kernel and related components, drivers and other code saved directory, if you need in-depth understanding or debugging of rtt core functions, you can find, modify, debug in this directory.

Mirror file or its auxiliary file:

-Second stagebootloader of bootloader.bin:esp32

-partitions_singleapp.bin:esp32 partition table data. Currently, rtt defaults to non-ota images.

-object code for rttthread-esp32.bin:rtt on esp32.

-esp32.common.ld, esp32_out.ld, rtthread-esp32.elf, rtthread-esp32.map: intermediate files and scripting tools for compiling images.

Configuration header files for rtconfig.h and rtconfig_project:rtt.

Configuration file for sdkconfig.h:esp-idf

Python script compiled by rtconfig.py and rtconfig.pyc:rtt.

Burn_flash.bat: image burning to write scripts.

Kconfig, Makefile, mkbin.bat, SConscript, SConstruct: various scripts compiled by the project.

README.md: project introduction.

On the Linux system ESP32 development board how to build RT-Thread development environment to share here, I hope the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

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