常用到位操作， 共享2个常用寄存器位操作函数

static void read_interface (uint8_t addr, uint8_t *val, uint8_t MASK, uint8_t SHIFT)
{
    uint8_t tmp;
    tmp = read_reg(addr);


    tmp &= (MASK << SHIFT);
    *val = (tmp >> SHIFT);
}


static  void config_interface (uint8_t addr, uint8_t val, uint8_t MASK, uint8_t SHIFT)
{
    uint8_t tmp = 0;


    tmp = read_reg(addr);
    tmp &= ~(MASK << SHIFT);
    tmp |= (val << SHIFT);


    write_reg(addr, tmp);
}