reverse MSB LSB bit.

reverse_bit.c

unsigned char reverse_bit8(unsigned char x)
{
	x = ((x & 0x55) << 1) | ((x & 0xAA) >> 1);
	x = ((x & 0x33) << 2) | ((x & 0xCC) >> 2);
	return (x << 4) | (x >> 4);
}


unsigned short reverse_bit16(unsigned short x)
{
	x = ((x & 0x5555) << 1) | ((x & 0xAAAA) >> 1);
	x = ((x & 0x3333) << 2) | ((x & 0xCCCC) >> 2);
	x = ((x & 0x0F0F) << 4) | ((x & 0xF0F0) >> 4);
	return (x << 8) | (x >> 8);
}


unsigned int reverse_bit32(unsigned int x)
{
	x = ((x & 0x55555555) << 1) | ((x & 0xAAAAAAAA) >> 1);
	x = ((x & 0x33333333) << 2) | ((x & 0xCCCCCCCC) >> 2);
	x = ((x & 0x0F0F0F0F) << 4) | ((x & 0xF0F0F0F0) >> 4);
	x = ((x & 0x00FF00FF) << 8) | ((x & 0xFF00FF00) >> 8);
	return (x << 16) | (x >> 16);
}

Thanks, works like a charm

Thank you!