Precautions for lvgl v8.2 string display on keil MDK (take little bear pie as an example)

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Before that LVGL Simulator CodeBlock There is a multilingual demo, For learning LVGL The application of many languages , As shown below :

Later, I transplanted it to the little bear development board , It turned out to be like this , Even the display position of the control has changed ( The specific reason for the control shift is unknown , To be analyzed later LVGL Source code )：

This is a coding problem . According to past experience , Directly find the file with Chinese string in the project directory , use notepad++ Turn it into utf-8, Then save it directly and open it again Keil MDK That's all right. , Then try it ：

Next open MDK engineering , recompile , There is 6 individual Error:

1、 Wrong pit arrangement

The cause of the error shows that there are too many parameters to call the macro , But in fact, this is just a parameter ... Should not be , I began to doubt whether the compiler supported wide character display , So search Keil MDK The help manual sees this ：

Follow the instructions in the documentation , I am here Misc Controls Add... To this configuration item --no-multibyte-chars, And then recompile the project ：

Next, download it to the development board ：

The final display is normal .

2、 The core reason

adopt STM32CubeMX The encoding format of the generated program source file is not UTF-8 perhaps UTF16, Therefore, if you write Chinese and some special national language characters under some files, you need to convert the files manually . If the source file code is UTF-8 or UTF-16, And the file begins with a byte order mark , The compiler will ignore --locale and --[no_]multibyte_chars Option and interpret the file as UTF-8 or UTF- 16.

3、 The correct approach

Usually do multi language display , We need to separate the languages of each different country into different documents , Then transcode it separately , To facilitate unified management , for example 3D Printer firmware Marlin Code , That's what it does ：

And some simulation display software , The coding environment is relatively perfect , Many pits have actually helped us eliminate them in advance , Therefore, in the face of some platforms with less perfect coding environment , Understanding the environment configuration and some coding rules is more helpful for us to locate the problem . If you have a better way , Leave a comment in the comments section , Communicate together LVGL applied technology . At present, the application routine is still being modified , Later, it will be shared to Github perhaps Gitee, The address will be given in the comments section . Next issue will share how to simulate a rotary encoder to realize keyboard input .

Past highlights

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