如何读写单个bit

如何读写单个 bit

#define BitVal(data,y) ( (data>>y) & 1)             // Return Data.Y value
#define SetBit(data,y)    data |= (1 << y)          // Set Data.Y to 1
#define ClearBit(data,y)  data &= ~(1 << y)         // Clear Data.Y to 0
#define TogleBit(data,y)     (data ^=BitVal(y))     // Togle Data.Y value
#define Togle(data)   (data =~data )                // Togle Data value

例如：

uint8_t number = 0x05; //0b00000101
uint8_t bit_2 = BitVal(number,2); // bit_2 = 1
uint8_t bit_1 = BitVal(number,1); // bit_1 = 0

SetBit(number,1); // number =  0x07 => 0b00000111
ClearBit(number,2); // number =0x03 => 0b0000011

参考与致谢

• How to read/write arbitrary bits in C/C++

原文地址：https://wiki-power.com/
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