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Good moorning,I am trying to create a struct of date of this style://Struct 1
union{ struct{ union{ struct{ bool interrupt_receive; bool fifo_mode; bool enable; bool bits_14_mode; bool int_source_readed; bool void6; bool void7; bool void8; }; unsigned char registro; }REG_CTRL_FLG; union{ struct{ unsigned int REG_CTRL_TIMEH; unsigned int REG_CTRL_TIMEL; }; unsigned short REG_CTRL_TIME; }; unsigned int threshold; //Para pruebas pendiente de eliminar //AXIS_STRUCT data_axis; //AXIS_EXTEND_STRUCT data_full_axis; }registros_acelerometro; unsigned int registro[3]; }ACELEROMETRO;
//Struct 2
typedef union{ struct{ unsigned char dlc_0; union{ struct{ unsigned char p15:1; unsigned char p14:1; unsigned char p13:1; unsigned char p12:1; unsigned char p11:1; unsigned char p10:1; unsigned char p9:1; unsigned char p8:1; unsigned char p7:1; unsigned char p6:1; unsigned char p5:1; unsigned char p4:1; unsigned char p3:1; unsigned char p2:1; unsigned char p1:1; unsigned char p0:1; }; unsigned short p; }pulsadores; union{ struct{ unsigned char lb0:1; unsigned char lb1:1; unsigned char ls0:1; unsigned char ls1:1; unsigned char iluminacion:1; unsigned char completo:1; unsigned char sobrecarga:1; unsigned char void7:1; }registro_cabina; unsigned char estado_cabina; }; unsigned char dlc_4; }registros_can_data; unsigned char can_data[5]; }TRESA_PULS;
The alignment of the union pulsadores is set by the alignment requirement of its member 'p'. The compiler inserts a padding byte between dlc_0 and pulsadores. You can tell it not to using type attributes __attribute__((packed)) or __packed, depending on your compiler. There are many examples of use in the compiler books included with the Keil IDE.