1. [Arduino头文件包含的注意](https://blog.csdn.net/weixin_42042056/article/details/118190017?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-1-118190017-blog-22197877.pc_relevant_3mothn_strategy_recovery&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-1-118190017-blog-22197877.pc_relevant_3mothn_strategy_recovery&utm_relevant_index=1)

2. C++和C语言冲突的问题解决相关

   C语言和C++冲突的问题:

   ```c
   error: unknown type name 'class'
   error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
   error: unknown type name 'SPIClass'
   
   ```

   解决 ：把所有的.c改成.cpp；删除 

   ```c
   #ifdef __cplusplus
   	extern "C" {
   #endif
         /*代码块*/
    #ifdef __cplusplus
   	extern "C" }
   #endif       
   ```

3. Arduino添加头文件的方法:后面添加...

