Esp32 things (II): sharpening the knife without mistaking firewood - make preparations before project development

    If this is your first contact FreeRTOS and ESPRESSIF Products , For example, I , It still needs a general impression , Then deepen one by one . Everyone who works on the project knows , The bosses don't allow us to finish the research safely and then start the project .

    That doesn't prevent us from having our own rhythm , Balance the progress of the project , We should also do things according to the rules of things . This requires a quick preparation of some preparatory knowledge , The skill of sharpening a knife and cutting wood , Rush into battle , Haste makes waste .

     One 、 understand ESP32 chip

    ESP32 The basic parameters of are as follows ：

    

    A little deeper , We can see ESP32 The specifications for ：

    《esp32_datasheet_cn.pdf》

    《esp32_technical_reference_manual_cn.pdf》

    These can be downloaded from Le Xin's website .

    Two 、 A preliminary understanding FreeRTOS

    ESP32 Use FreeRTOS, And made customization based on dual core , If this is your first contact FreeRTOS, That's also a simple understanding FREERTOS. There is a detailed document , You can quickly browse some of them in the early stage ：

    《FreeRTOS_Reference_Manual_V9.0.0.pdf》

    

    3、 ... and 、 read ESP-IDF file

    To understand the FreeRTOS, Just have a look esp32 Provides those functions , Before it really starts , We need a quick look at esp32 Of sdk, The specific website is as follows ：

    https://esp-idf.readthedocs.io/en/latest/index.html,

     This document is esp32 Development is the most authoritative 、 The most complete official document , So you should always look up this official document . His wifi function

     Four 、 install ESP-IDF Environmental Science

    The next step is to experiment with real weapons , But first install ESP-IDF Environment , You can see... In the official documents Get Started chapter ,

     https://esp-idf.readthedocs.io/en/latest/get-started/index.html

     Here are the latest and most complete configuration steps , These environment configuration steps include ：

    1、 Ready to compile PC（windows/mac/linux Interface ）, Prepare the development board and USB Connecting line .

    2、 Configure cross compile toolchain .

    3、 from github Download esp-idf.

    4、 Install and configure the editing development environment , Recommended on the official website Eclipse, Can be integrated GDB debugging . This step is optional , I didn't do it myself .

    Just follow the steps in the documentation , Basically no problem .       

     5、 ... and 、ESP32 Compilation of

     This is when the most interesting work can be done , Develop and compile the application and try it out . This can be summarized into four steps ：

    1、 Configuration items , Write code .

     We all start with an example ,esp32 There are plenty of examples in the code .

    2、 compile

    3、 burning

    4、Monitor and Debug Program operation .

     We usually use the output of the serial port to Debug, Is to use the most Low Print from Debug. If the program Bug Not sure , Also available JTAG and GDB Step by step debugging , By default, the development board supports JTAG Of , Usually, the board of your own project does not necessarily support this .

    among , There are some useful commands for compiling and burning , It is not completely written in the document ：

    •make menuconfig–  Run the configuration menu , done kernel Developers will be very familiar with .

    • make defconfig -  Set default values for all configuration items

    •make all–  Compile all code .

    •make flash–  Put the compiled Bin The document burns to write ESP32 in .

    •make clean–  Clear the files generated by compilation .

    •make monitor–  Connect ESP32 A serial port , And output ESP32 Print information for .

    •make erase_flash–  erase ESP32 The whole of Flash.

    • make size -  Show Bin The size of each part of the file

    • make size-components -, size-files -  The amount of memory each module occupies , This is still useful after the expansion of project code .

    •make app–  compile app.bin

    •make app-flash–  burning app.bin

    The others can be just as the name suggests ：

    •make app-clean–

    •make bootloader–

    •make bootloader-flash–

    •make bootloader-clean–

    •make partition-table–

     6、 ... and 、 Run an example

    Okay , up to now , You can enter esp-idf/examples, Find one.   Favorite examples , And try to compile and burn .