HX117 AD转换模块在STC15F2K08S2下无法工作

unsigned long HX711_Read(void) //增益128
{
unsigned long count;
unsigned char i;
HX711_DOUT=1; //DOUT是P0^0 SCK是P0^1
Delay__hx711_us();
HX711_SCK=0;
count=0;
while(HX711_DOUT){
sprintf(buff1,"debug");
SendString(buff1);
}
sprintf(buff1,"8888");
SendString(buff1);
for(i=0;i<24;i++)
{
HX711_SCK=1;
count=count<<1;
HX711_SCK=0;
if(HX711_DOUT)
count++;
}
HX711_SCK=1;
count=count^0x800000;//第25个脉冲下降沿来时，转换数据
Delay__hx711_us();
HX711_SCK=0;
return(count);
}