lpc_lib.c

给大家提供一个在inram/exram中调试的示例,在周公的lpc2200上调试过.

/***********************************************************************
 *         BU MMS China, Philips Semiconductor Software Support
 *         Embest info&Tech Co. Software Support
 *---------------------------------------------------------------------------
 * The software is delivered "AS IS" without warranty or condition of any
 * kind, either express, implied or statutory.  Everybody can use it as 
 * it is opened and without copyright. We will not take any law responsibility
 * for any problem produced by using this software.
 *---------------------------------------------------------------------------                                                              
 *    File name: 	LPC_Lib.c
 *    Description:	Define some common functions for LPC2000 API
 *                                                                                      
 *    History:                                                                     
 *    1. Date: 		Aug 11, 2004                                              
 *       Author: 	Shawn Zhang                                                    
 *       Description: Create 
 *
 *	$Revision: 1.0 $
 **********************************************************************/

#include "LPC_Lib.h"

/*************************************************************************
 * Function Name: BitToNum
 * Parameters: unsigned long bit
 *
 * Return: unsigned long -- number
 *
 * Description: Convert bit format to number format.  
 *			Eg. 0x10 -> 5
 *  
 *************************************************************************/
unsigned int BitToNum(unsigned long bit)
{
	unsigned int num=0;
	unsigned long temp = bit;
	
	while (temp != 1)
	{
		temp = temp>>1;
		num++;
	}
	return num;
}

/*************************************************************************
 * Function Name: strcpy
 * Parameters: char *des
 *			const char *src
 *
 * Return: char * --the destination string
 *
 * Description: Copy a string.
 *  
 *************************************************************************/
char *strcpy(char *des, const char *src)
{
	char *pChar = des;
	
	while(*src)
		*(des++)=*(src++);
	return pChar;
}

/*************************************************************************
 * Function Name: strcat
 * Parameters: char *des
 *			const char *src
 *
 * Return: char * --the destination string
 *
 * Description: Append a string
 *  
 *************************************************************************/
char *strcat(char *des, const char *src)
{
	char *pChar = des;
	
	while(*des)
		des++;

	while(*src)
		*(des++)=*(src++);
	
	return pChar;
}

/*************************************************************************
 * Function Name: itoa
 * Parameters: int value
 *			char *string
 *			int radix
 *
 * Return: char * -- returns a pointer to string
 *
 * Description: Convert an integer to a string
 *  
 *************************************************************************/
char *itoa( int value, char *string, int radix )
{
	char *head, *tail, *pChar = string, temp;
	int count = 0, x = value, i, y;
	
	while(x)
	{
		y = x % radix;
		if (y>=0 && y <=9)
			*string++ =  y + '0';
		else if (y>=0xA && y<=0xF)
			*string++ =  y + '7';
		count++;
		x = x / radix;
	}

	for(i=0, head=pChar, tail=--string; i< count /2; i++, head++, tail--)
	{
		temp=*head;
		*head = *tail;
		*tail = temp;
	}

	return pChar;
}

/*************************************************************************
 * Function Name: ultoa
 * Parameters: long value
 *			char *string
 *			int radix
 *
 * Return: char * -- returns a pointer to string
 *
 * Description: Convert a long to a string
 *  
 *************************************************************************/
char *ultoa(unsigned long value, char *string, int radix )
{
	char *head, *tail, *pChar = string, temp;
	unsigned long count = 0, x = value, i, y;
	
	while(x)
	{
		y = x % radix;
		if (y <=9)
			*string++ =  y + '0';
		else if (y>=0xA && y<=0xF)
			*string++ =  y + '7';
		count++;
		x = (x / radix);
	}

	for(i=0, head=pChar, tail=--string; i< count /2; i++, head++, tail--)
	{
		temp=*head;
		*head = *tail;
		*tail = temp;
	}

	return pChar;
}

/*************************************************************************
 * Function Name: atoi
 * Parameters: char *string
 *
 * Return: int* -- returns a integer
 *			If the string is unvalid, return -1.
 *
 * Description: Convert a string to an integer
 *  
 *************************************************************************/
int atoi(char *string )
{
	char *pch = string;
	int num=0;

	while(*pch)
	{
		if (*pch<'0' || *pch>'9')
			return -1;
		
		num *= 10;
		num += (*pch - '0');
		pch++;
	}
	return num;
}