51单片机PC数据传输 温度 距离 监控系统设计

1 if(openport("com4"))
2     printf("open comport success\n");
3 if(setupdcb(9600))
4     printf("setupDCB success\n");
5 if(setuptimeout(0,0,0,0,0)) //如果所有写超时参数均为0，那么就不使用写超时
6     printf("setuptimeout success\n");
7 clearall();//全清

 1 while(1){
 2     scanf("%d",&a);//1表示要温度,2表示要距离,3表示距离警报关闭,4温度警报关闭,5改变距离阈值,6改变温度阈值
 3     if(a==5){ 4         m_szWriteBuffer[0]='5';
 5         WriteChar(m_szWriteBuffer,1);
 6         printf("Please enter the num:(0-100cm) \n");
 7         scanf("%d",&a);
 8         m_szWriteBuffer[0]=(BYTE)(a);
 9         WriteChar(m_szWriteBuffer,1);
10         ReceiveChar(m_szReceiveBuffer,20);
11         printf("%s\n",m_szReceiveBuffer);
12     }else if(a==6){
13         m_szWriteBuffer[0]='6';
14         WriteChar(m_szWriteBuffer,1);
15         printf("Please enter the num:(0-100℃) \n");
16         scanf("%d",&a);
17         m_szWriteBuffer[0]=(BYTE)(a);
18         WriteChar(m_szWriteBuffer,1);
19         ReceiveChar(m_szReceiveBuffer,20);
20         printf("%s\n",m_szReceiveBuffer);
21     }else{
22         m_szWriteBuffer[0]=(BYTE)(a+'0');
23         WriteChar(m_szWriteBuffer,1);
24 
25         ReceiveChar(m_szReceiveBuffer,20);
26         printf("%s\n",m_szReceiveBuffer);
27     }
28 }