serial.c

来自「一个通过8051来控制8019上网的程序 该程序已经通过并成功用于键盘」· C语言 代码 · 共 49 行

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


void init_serial(void)
{
//	ClearCommRecBuffer();
//	OpenComm();
}

//------------------------------------------------------------------------
// 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);
}