stm32 reads hx711

There is no change in the data read by the microcontroller hx711, pressure sensor has pressure change, but there is no change in the data read by the chip
code:

```c
int main(void)
{

    HX711_InIt ();
    OLED_Init();
    OLED_Clear();

    while(1)
    {
        HX711_Read();
        Delay_us (2);
        HX711_Read();
        Delay_us (2);
        HX711_Read();
        Delay_us (2);
        Get_Maopi();
        Get_Weight ();
        
        OLED_ShowString (1,1,"weight =");
        Get_Maopi ();
        Delay_us (2);
        Get_Weight ();
        OLED_ShowNum (2,1,Weight_Shiwu  ,7);    
    } 
}
unsigned long HX711_Read(void) 
{ 
    unsigned long value= 0;
    unsigned char i = 0;
    GPIO_SetBits (GPIOB ,GPIO_Pin_7);
    Delay_us (2);
    GPIO_ResetBits (GPIOB ,GPIO_Pin_6);
    Delay_us(2);

    while(GPIO_ReadInputDataBit (GPIOB,GPIO_Pin_7)==1);//dengdaiADzhuanhuanjieshu 
    for(i=0;i<24;i++)
    {

        GPIO_SetBits (GPIOB ,GPIO_Pin_6);
        value =value <<1;
        
        GPIO_ResetBits (GPIOB ,GPIO_Pin_6);
        if(GPIO_ReadInputDataBit(GPIOB ,GPIO_Pin_7)==1)
        {
            value ++;
        }
    }
    
    GPIO_SetBits(GPIOB,GPIO_Pin_6 );
    Delay_us(2);
    value=value^0x800000;
    
    GPIO_ResetBits (GPIOB ,GPIO_Pin_6);
    Delay_us(2);
    return (value);
}

void Get_Maopi()  //获取初始值
{
    Weight_Maopi = HX711_Read();
}    

```