de2_includes.h

Altera DE2开发板的LED、LCD、SEG7和按键的linux下的设备驱动程序

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/ioport.h>
#include <asm/uaccess.h>	/* for put_user */
#include <asm/io.h>

// max buffer length
#define STRING_LEN 10
#define STRING_LEN_ 1000000000 // for ltoa function

// convert string to integer
extern inline int atoi(const char *name)
{
	int val = 0;
	for (;;name++) 
	{
		switch (*name) 
		{
			case '0'...'9':
				val = 10*val+(*name-'0');
				break;
			default:	
				return val;
		}
	}
}

// convert string to long integer
extern inline long int atol(const char *name)
{
	long int val = 0;
	for (;;name++) 
	{
		switch (*name) 
		{
			case '0'...'9':
				val = 10*val+(*name-'0');
				break;		
			default:	
				return val;
		}
	}
}

// convert hexadecimal string to decimal long integer
extern inline long int atolx(const char *name)
{
	long int val = 0;
	for (;;name++) 
	{
		switch (*name) 
		{
			case '0'...'9':
				val = 16*val+(*name-'0');
				break;
			case 'A': 
			case 'a':
				val = 16*val+10;
				break;
			case 'B':
			case 'b':
				val = 16*val+11;
				break;
			case 'C':
			case 'c':
				val = 16*val+12;
				break;
			case 'D':
			case 'd':
				val = 16*val+13;
				break;
			case 'E':
			case 'e':
				val = 16*val+14;
				break;
			case 'F':
			case 'f':
				val = 16*val+15;
				break;			
			default:	
				return val;
		}
	}
}

// convert byte to string
extern inline void itoa(char *name, unsigned char value)
{
	int i,j=0;
	for(i=10000;i>0;i/=10)
	{
		name[j++]='0'+value/i;
		value=value-(value/i)*i;
		if(name[0]=='0' && i!=1)
			j=0;
	}
	name[j++]='\n';
	name[j]=0;
}

// convert long int to string
extern inline void ltoa(char *name, unsigned long value)
{
	long int i,j=0;
	for(i=STRING_LEN_;i>0;i/=10)
	{
		name[j++]='0'+value/i;
		value=value-(value/i)*i;
		if(name[0]=='0' && i!=1)
			j=0;
	}
	name[j++]='\n';
	name[j]=0;
}