51單片機串口檢測程序

//向串口發送一個字符串，strlen為該字符串長度
void send_string_com( unsigned char *str, unsigned int strlen)
{
unsigned int k= 0 ;
do
{
send_char_com(*(str + k));
k++;
} while (k strlen);
}

//串口接收中斷函數
void serial () interrupt 4 using 3
{
if (RI)
{
unsigned char ch;
RI = 0 ;
ch=SBUF;
if (ch> 127 )
{
count3= 0 ;
inbuf1[count3]=ch;
checksum= ch- 128 ;
}
else
{
count3++;
inbuf1[count3]=ch;
checksum ^= ch;
if ( (count3==(INBUF_LEN- 1 )) (!checksum) )
{
read_flag= 1 ; //如果串口接收的數據達到INBUF_LEN個，且校驗沒錯，
//就置位取數標志
}
}
}
}

main()
{
init_serialcomm(); //初始化串口
while ( 1 )
{
if (read_flag) //如果取數標志已置位，就將讀到的數從串口發出
{
read_flag= 0 ; //取數標志清0
send_string_com(inbuf1,INBUF_LEN);
}
}

}