1 #define XON  0x11    /*Ctrl-Q*/
 2 #define XOFF 0x13 /*Ctrl-S*/
 3 
 4 void Xon_Xoffsend(unsigned char *buf,unsigned char len)
 5 {
 6     static unsigned short int NbrDataToTransfer =len;
 7     
 8     while(USART_ReceiveData(USART1)!=XON);
 9     while(NbrDataToTransfer--) 
10     {        
11         USART_SendData(USART1,TxBuffer[TxCounter++]);
12         while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); //等待发送结
13         if (USART_ReceiveData(USART1)==XOFF) 
14         {
15             while(USART_ReceiveData(USART1)==XON); 
16         } 
17     }
18 }
19 
20 void RTS_CTS(void)
21 {
22     if (接收缓冲区为空) 
23     {
24         RTS =0 ;/*从机查询if(CTS ==0)则从机可以发送，否则停止发送*/
25     }
26     else 
27     {
28         RTS =1 ;
29     }
30     if (CTS ==0) /*由从机复位和置位*/
31     {
32         Mast_send;
33     }
34     else 
35     {
36         Mast_sendStop!;
37     }
38 }