char s_write_byte(unsigned char value)
//----------------------------------------------------------------------------------
// writes a byte on the Sensibus and checks the acknowledge
{
unsigned char i,error=0;
for (i=0x80;i>0;i/=2) //shift bit for masking
{ if (i & value)
DATA=1; //masking value with i , write to SENSI-BUS
else
DATA=0;
SCK=1; //clk for SENSI-BUS
_nop_();_nop_();_nop_(); //pulswith approx. 5 us
SCK=0;
}
DATA=1; //release DATA-line
SCK=1; //clk #9 for ack
error=DATA; //check ack (DATA will be pulled down by SHT11)
SCK=0;
return error; //error=1 in case of no acknowledge
}
在公司给的源程序中很多release DATA-line，这有什么用啊？我看使用手册中也没提到啊，而且我的sht芯片给他发指令后他也没响应（将数据线拉低）为什么啊，是坏掉了吗，我用的是stm32，我敢确定我的时序没问题的 |
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