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          PIC C18自帶串口程序
          
						
          
				作者：
				時(shí)間：2016-11-13
				來源：網(wǎng)絡(luò)
				
				
				
				
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			官方寫的串口程序，值得學(xué)習(xí)一下！
          (串口無論接收還是發(fā)送都有輪詢法和中斷法)

          讀一個(gè)字節(jié)
          #include 
          #include 
          /********************************************************************
          *  Function Name: ReadUSART                   *
          *  Return Value:  char: received data              *
          *  Parameters:   void                      *
          *  Description:  This routine reads the data from the USART   *
          *          and records the status flags for that byte   *
          *          in USART_Status (Framing and Overrun).     *
          ********************************************************************/
          #if defined (AUSART_V1) || defined (EAUSART_V3) || defined (EAUSART_V4) || defined (EAUSART_V5)
          char ReadUSART(void) //this function can be removed by macro #define ReadUSART RCREG
          {
           char data;  // Holds received data
           USART_Status.val &= 0xf2;     // Clear previous status flags
           if(RCSTAbits.RX9)         // If 9-bit mode
           {
            USART_Status.RX_NINE = 0;    // Clear the receive bit 9 for USART
            if(RCSTAbits.RX9D)        // according to the RX9D bit
             USART_Status.RX_NINE = 1;
           }
           if(RCSTAbits.FERR)         // If a framing error occured
            USART_Status.FRAME_ERROR = 1;  // Set the status bit
           if(RCSTAbits.OERR)         // If an overrun error occured
            USART_Status.OVERRUN_ERROR = 1; // Set the status bit
           data = RCREG;           // Read data
           return (data);           // Return the received data
          }
          #endif
          獲取字符串
          #include 
          #include 
          /********************************************************************
          *  Function Name: getsUSART                   *
          *  Return Value:  void                      *
          *  Parameters:   buffer: pointer to string           *
          *          len: length of characters to receive      *
          *  Description:  This routine receives a string of characters  *
          *          from the USART of length specified by len.   *
          ********************************************************************/
          #if defined (AUSART_V1) || defined (EAUSART_V3) || defined (EAUSART_V4) || defined (EAUSART_V5)
          void getsUSART(char *buffer, unsigned char len)
          {
           char i;  // Length counter
           unsigned char data;
           for(i=0;i
           {
            while(!DataRdyUSART());// Wait for data to be received
            data = getcUSART();  // Get a character from the USART      =ReadUSART(void)
                       // and save in the string
            *buffer = data;
            buffer++;       // Increment the string pointer
           }
          }
          #endif

          寫一個(gè)字符
          #include 
          #include 
          /********************************************************************
          *  Function Name: WriteUSART                   *
          *  Return Value:  none                      *
          *  Parameters:   data: data to transmit             *
          *  Description:  This routine transmits a byte out the USART.  *
          ********************************************************************/
          #if defined (AUSART_V1) || defined (EAUSART_V3) || defined (EAUSART_V4) || defined (EAUSART_V5)
          void WriteUSART(char data)
          {
           if(TXSTAbits.TX9) // 9-bit mode?
           {
            TXSTAbits.TX9D = 0;    // Set the TX9D bit according to the
            if(USART_Status.TX_NINE) // USART Tx 9th bit in status reg
             TXSTAbits.TX9D = 1;
           }
           TXREG = data;   // Write the data byte to the USART
          }
          #endif
          寫一個(gè)字符串
          #include 
          #include 
          /**********************************************************************
          *  Function Name: putsUSART                    *
          *  Return Value:  void                       *
          *  Parameters:   data: pointer to string of data         *
          *  Description:  This routine transmits a string of characters  *
          *          to the USART including the null.         *
          **********************************************************************/
          #if defined (AUSART_V1) || defined (EAUSART_V3) || defined (EAUSART_V4) || defined (EAUSART_V5)
          void putsUSART( char *data)
          {
           do
           { // Transmit a byte
            while(BusyUSART());
            putcUSART(*data);    //=WriteUSART
           } while( *data++ );
          }
          #endif

          
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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          關(guān)鍵詞：
            			            PIC串口程
                        
            
          
            
			
          
		
          	
		

	

          
	
	
          
		
          
			
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