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Test enumeration types with STM32 platform running RT thread

2022-06-30 07:18:00 【liwuxing】

An enumeration type describes a collection of integer values , It is convenient to use descriptions to use corresponding values . If you need to modify an enumeration member （ Constant ） Value , You can directly modify the enumeration type definition .

About enumeration types （ Enumeration label ）、 Members of the enumeration （ Enumeration constants ）、 Enumerate variables ：

enum Example ： Enumeration members are defined as INT type (4 byte ) The number number of , The number can be repeated ; Usually from 0 Add... In sequence 1; Or define yourself .

The value range of an enumeration variable should normally be one of the enumeration members of the corresponding enumeration type .

Utilization operation rt-thread Of stm32 platform , You can test enumeration types with the following sample code .

#include <rtthread.h>
#define INT_MIN -2147483648  //80000000
#define INT_MAX 2147483647		//7FFFFFFF

enum test{m1=INT_MIN,m1_1,m2=33,m2_1,m3=INT_MAX,m4=33};


int enum_test(void) 
{     
  rt_kprintf(" Enumerate application examples \n");
  rt_kprintf("%d\n%d\n%d\n%d\n%d\n%d\n", m1,m1_1,m2,m2_1,m3,m4);
  rt_kprintf(" Enumerate application examples 2\n");
  rt_kprintf("%d\n%d\n",(int)INT_MIN,(int)INT_MAX);	
  enum test test1,test2,test3;
  test1=m2_1;
  test2=m3;
  test3=11;		// Illegal use ,MDK Compile time warnings , But I don't think it's wrong .
  rt_kprintf("%d\n%d\n%d\n",test1,test2,test3);	
  return 0;	
}
/*  Export to  msh  In the command list  */
MSH_CMD_EXPORT(enum_test, test enum app.);

Debug serial port output ：