serial.c

Keil_C51程序,C8051实现的TCP/IP功能源码

//-----------------------------------------------------------------------------
// Net SERIAL.C
//
// This module handles RS-232 messages and associated tasks
//-----------------------------------------------------------------------------
#include "reg52.h"
#include "string.h"
#include "intrins.h"
#include "net.h"
#include "serial.h"
#include "absacc.h"

unsigned int 	CommRecLength;//串口接受数据长度，同时用作地址标注
bit				CommRecFlag;//串口接收标志，接收到后置为1
bit				CommRecBlock;
#define		REC_BLOCK0	0x4000
#define		REC_BLOCK1	0x5000
 
void init_serial(void)
{
	SCON=0x50;//将串口设置为方式1，8位数据
	PCON=0x80;//不进行2分频
	TMOD=0x20;//定时器1设为模式2，
	TL1=0xff;//设置波特率为57600=0xff,SMOD=1,51200=0x0,9600(TL1=0xFA,SMOD=1)，5760
	TH1=0xff;//设置波特率f6
	PS=1;//串行中断优先级高
	TR1=1;//启动定时器1

	RI=0;					// Clear HW_UART receive and transmit
	TI=0;					// complete indicators.
	ES=1; 					// allow the serial interrupt

	CommRecLength=0;
	CommRecFlag=0;
	CommRecBlock=0;
}

void Serial_Send_Ch(unsigned char ch)
{
//	ES=0;
	SBUF=ch;
	while(!TI){}
	TI=0;
//	ES=1;
}

void SendCommString(unsigned char *base) 
{
	unsigned char length=strlen(base);	
	unsigned char i;
	for(i=0;i<length;i++)Serial_Send_Ch(*(base+i));
}

void CommISR(void) interrupt 4
{
/*	if (TI)
	{
		return ;
	}*/
	if (RI)	
	{	 
		RI=0;
		if(CommRecBlock)XBYTE[CommRecLength+REC_BLOCK0]=SBUF;
			else XBYTE[CommRecLength+REC_BLOCK1]=SBUF;
		CommRecLength++;
		CommRecFlag=1;
   	}
}

//------------------------------------------------------------------------
// This function converts an integer to an ASCII string.  It is a 
// normally provided as a standard library function but the Keil
// libraries do not include it.  Caution: The string passed to this
// must be at least 12 bytes long
//------------------------------------------------------------------------
char * itoa(UINT value, char * buf, UCHAR radix)
{
	UINT i;
	char * ptr;
	char * temphold;

  	temphold = buf;
	ptr = buf + 12;
	*--ptr = 0;		// Insert NULL char
	do
	{
	   // First create string in reverse order
	   i = (value % radix) + 0x30;
		if(i > 0x39) i += 7;
		*--ptr = i;
      value = value / radix;
  	} while(value != 0);

	// Next, move the string 6 places to the left
	// Include NULL character
	for( ; (*buf++ = *ptr++); );	
	return(temphold);
}