老是报错warning C290: missing return value 单片机大神们，求助一波

ID:252109 · 发表于 2017-12-14 14:40

下面的单片机程序报错XIANSHI.C(67): warning C290: missing return value

unit read2543(unsigned char port)
{
unsigned int i;
unit ad_value=0;

TCL2543_CLK=0;
TCL2543_CS=0;
port<<=4;
for(i=0;i<12;i++)
{
  if(TCL2543_DOUT)
ad_value|=0x01;
  TCL2543_ADIN=(bit)(port&0x80);
  TCL2543_CLK=1;
delay(60);
  TCL2543_CLK=0;
delay(60);
port=port<<1;
  ad_value=ad_value<<1;
}
TCL2543_CS=1;
ad_value=ad_value>>1;
}

ID:155507 · 发表于 2017-12-14 18:10

试试看

unit read2543(unsigned char port)
{
unsigned int i;
unit ad_value=0;
TCL2543_CLK=0;
TCL2543_CS=0;
port<<=4;
for(i=0;i<12;i++)
{
if(TCL2543_DOUT)
ad_value|=0x01;
TCL2543_ADIN=(bit)(port&0x80);
TCL2543_CLK=1;
delay(60);
TCL2543_CLK=0;
delay(60);
port=port<<1;
ad_value=ad_value<<1;
}
TCL2543_CS=1;
ad_value=ad_value>>1;
return ad_value;
}

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