void Delay_us(uint32_t us)
{
    uint32_t ticks = 72 * us;
    SysTick->LOAD = ticks;
    SysTick->CTRL |= 0x01;  //enable
    while (!(SysTick->CTRL&SysTick_CTRL_COUNTFLAG_Msk));
    SysTick->CTRL &= ~0x01; //disable
}

PIN_OUT_PP(One_Wire_Pin);
while (1)
{
    PIN_ON(One_Wire_Pin);
    Delay_us(500);
    PIN_OFF(One_Wire_Pin);
    Delay_us(500);
}

unsigned int One_Wire_Reset(GPIO_TypeDef * GPIOx, uint16_t PINx)
{
    unsigned int tmp;
    PIN_IN(GPIOx, PINx);
    if ((PIN_SYG(GPIOx, PINx))==0)    return One_Wire_Bus_Low_Error;

    PIN_OUT_PP(GPIOx, PINx);
    PIN_OFF(GPIOx, PINx);
    Delay_us(480);
    PIN_ON(GPIOx, PINx);
    PIN_IN(GPIOx, PINx);
    Delay_us(60);

    if ((PIN_SYG(GPIOx, PINx))==0) tmp=One_Wire_Success;
        else tmp=One_Wire_Error_No_Echo;
    Delay_us(Time_After_Reset);
    return tmp;
}