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  1. #include <stdint.h>
  2. #include <stdio.h>
  3.  
  4. typedef struct {     
  5.   union {
  6. volatile uint32_t DR;
  7.     struct {
  8.       volatile uint32_t D0      : 1;     
  9.       volatile uint32_t D1      : 1;         
  10.       volatile uint32_t D2      : 1;           
  11.       volatile uint32_t D3      : 1;           
  12.     } DR_b;
  13.   } ;
  14. } GPIO_PRT4_Type; 
  15.  
  16.  
  17. uint32_t test = 0;
  18.  
  19. int main()
  20. {
  21. 	printf("%08X\n", test);
  22.     ((GPIO_PRT4_Type*)&test)->DR_b.D0 = 1;
  23.    	printf("%08X\n", test);
  24. }
  25.  
Success #stdin #stdout 0s 4556KB
comments (?)
stdin
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Standard input is empty
stdout
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00000000
00000001
https://ideone.com/YIBM9s
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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