Common Bit operations in Embedded C programming

Manipulating bits is common in embedded programming

The common operations are to set a bit, clear a bit, toggle a bit and check if a bit is set

unsigned int toggle(unsigned int x, unsigned int index)

{

x ^= 1 << index;

return x;

}

unsigned int SetBit(unsigned int x, unsigned int index)

{

unsigned int mask = 1 << index;

x = x | mask;

 

return x;

}

unsigned int ClearBit(unsigned int x, unsigned int index)

{

unsigned int mask = 1 << index;

x = x & ~mask;

return x;

}

bool IsBitSet(unsigned int x, unsigned int pos)

{

unsigned int mask = 1 << pos;

if ((x&mask))

{

return true;

}

return false;

}