u8 bit_rev(u8 origin)
{
        static u8 rev_tbl[16] ={
                0x00, 0x08, 0x04, 0x0C,
                0x02, 0x0A, 0x06, 0x0E,
                0x01, 0x09, 0x05, 0x0D,
                0x03, 0x0B, 0x07, 0x0F,
        };

        u8 result = 0;

        result |= ((rev_tbl[origin & 0x0F] << 4) | rev_tbl[origin >> 4]);

        return result;
}

u8 bit_rev(u8 origin)
{
        origin = ((origin & 0x55) << 1) | ((origin >> 1) & 0x55));
        origin = ((origin & 0x33) << 2) | ((origin >> 2) & 0x33));
        origin = ((origin & 0x0F) << 4) | ((origin >> 4) & 0x0F));

        return origin;
}