|
２進数表記で定数を指定するためのマクロを作る。 #define CONST_BINARY_0000 ( 0x0 ) #define CONST_BINARY_0001 ( 0x1 ) #define CONST_BINARY_0010 ( 0x2 ) #define CONST_BINARY_0011 ( 0x3 ) #define CONST_BINARY_0100 ( 0x4 ) #define CONST_BINARY_0101 ( 0x5 ) #define CONST_BINARY_0110 ( 0x6 ) #define CONST_BINARY_0111 ( 0x7 ) #define CONST_BINARY_1000 ( 0x8 ) #define CONST_BINARY_1001 ( 0x9 ) #define CONST_BINARY_1010 ( 0xA ) #define CONST_BINARY_1011 ( 0xB ) #define CONST_BINARY_1100 ( 0xC ) #define CONST_BINARY_1101 ( 0xD ) #define CONST_BINARY_1110 ( 0xE ) #define CONST_BINARY_1111 ( 0xF ) #define BIN4( a ) \ CONST_BINARY_ ## a #define BIN8( a, b ) \ ((unsigned char)( ((0x0F & (BIN4( a ))) << 4) | (0x0F & (BIN4( b ))) )) #define BIN16( a, b, c, d ) \ ((unsigned short)( ((0xFF & (BIN8( a, b ))) << 8) | (0xFF & (BIN8( c, d ))) )) #define BIN32( a, b, c, d, e, f, g, h ) \ ((unsigned long)( ((0xFFFF & (BIN16( a, b, c, d ))) << 16) | (0xFFFF & (BIN16( e, f, g, h ))) )) 使用例const unsigned int CRC16_CCITT = BIN16( 1000,1000,0001,0000 ); const unsigned int CRC16 = BIN16( 1100,0000,0000,0010 ); const unsigned int CRC32 = BIN32( 1000,0010,0110,0000,1000,1110,1101,1011 ); | |
