comtest.c

用C8051F020实现的串口通信程序

//*************************************************************
//*           The RS232 program(C)version 1.0                 *
//*              By Li Huailiang 2007.10.12                   *
//*************************************************************
#pragma  REGPARMS
#include<c8051f020.h>
#include<intrins.h>
#include<absacc.h>
#include<math.h>
#include<stdio.h>
#include<stdlib.h>

#define uchar unsigned char
#define uint unsigned int
//--------------------------------------------------------------
uchar data asab[]={"this is Li \n"};
//uchar xdata RESULT[300];
//--------------------------------------------------------------
#define BAUDRATE     9600              // Baud rate of UART in bps
#define SYSCLK       11059200          // SYSCLK frequency in Hz
//--------------------------------------------------------------
void Oscillator_Init()
{
    int i = 0;
    OSCXCN    = 0x67;
    for (i = 0; i < 3000; i++);  // Wait 1ms for initialization
    while ((OSCXCN & 0x80) == 0);
    OSCICN    = 0x0C;
}

//--------------------------------------------------------------

void PORT_Init (void)
{
   	XBR0    = 0x07;  //Enable UART0      P0.0=TXD0      P0.1=RXD0
                     //Enable SPI        P0.2=SCK       P0.3=MISO 					
   	XBR1    = 0x00;                                        
	XBR2    = 0x44;  
					
  	P0MDOUT |= 0xFD;			
    P1MDOUT |= 0x40; 
    P1MDIN=0xFF;
    EMI0CF=0x3B;             


}
//--------------------------------------------------------------
void WDT()
{
  	   EA=0;
	   WDTCN = 0xde;    	// disable watchdog timer
   	   WDTCN = 0xad;
	   EA=1;
}
//-----------------------------------------------------------------------------
// Configure the UART0 using Timer1, for <baudrate> and 8-N-1.

void UART0_Init (void)
{
    SCON0 = 0x50;             //选择串口方式1,波特率9600bps
    TMOD = 0x20; 
    TH1 = 256-(SYSCLK/BAUDRATE/384); 
    CKCON |= 0x00;                      // Timer1 uses SYSCLK as time base
    PCON  |= 0x00;                      // SMOD00 = 1
	//TH1 = 0xFD;
	//TL1 = 0xFD;
    EA=1;
    ES0=1;                //UART0中断开启
    TR1=1; 
}
//-------------------------------------------------------------------------

void main()
	 {
	   uchar data i;
	   WDT();
	   Oscillator_Init();
       PORT_Init();
       UART0_Init();
       for(i=0;i<15;i++)
	   {
	    ES0=0;
		SBUF0=asab[i];
        while(!TI0);        
        TI0=0;
	   }
     while(1);
}