單片機(jī)串口接收中斷老是接收到00 00 00 00
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Sendstring("Receiving ............");
Sendstring("----------------------");
void revdata(void) interrupt 4
{
unsigned char temp;
while(RI==0); //if(RI==0)
//return; //
RI = 0;
temp = SBUF;
Sendchar(temp);
}
上面的程序在STC的串口上，接收的時(shí)候不會(huì)一直接收 00 00 00 00 00 ........
void revdata(void) interrupt 4
{
unsigned char temp;
if(RI)
RI = 0;
temp = SBUF;
Sendchar(temp);
}
上面的程序在STC的串口上，接收的時(shí)候會(huì)一直接收 00 00 00 00 00 ........
該中斷程序的結(jié)構(gòu)有問(wèn)題，單片機(jī)的中斷是根據(jù)SBUF中是否存在數(shù)據(jù)來(lái)中斷的，SBUF中存在“R”數(shù)據(jù)（Sendstring("Receiving ............");
void revdata(void) interrupt 4
{
unsigned char temp;
temp = SBUF;
Sendchar(temp);
} 一直在往外發(fā)送“R”
所以必須要進(jìn)行限制，如下
void revdata(void) interrupt 4
{
unsigned char temp;
if(RI)
{
RI = 0;
temp = SBUF;
Sendchar(temp);
}
}
評(píng)論