44blib.c

这是一个基于ARM44B0X的键盘扫描实验程序.

#include "44b.h"
#include "44blib.h"
#include "def.h"
#include "option.h"

#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>

#define STACKSIZE    0xa00 //SVC satck size(do not use user stack)//
#define HEAPEND     (_ISR_STARTADDRESS-STACKSIZE-0x500) // = 0xc7ff000//
//SVC Stack Area:0xc(e)7ff000-0xc(e)7ffaff//

//--------------------------------SYSTEM---------------------------------//
static int delayLoopCount=400;

void Delay(int time)
// time=0: adjust the Delay function by WatchDog timer.//
// time>0: the number of loop time//
// 100us resolution.//
{
	int i,adjust=0;
	if(time==0)
	{
		time=200;
		adjust=1;
		delayLoopCount=400;
		rWTCON=((MCLK/1000000-1)<<8)|(2<<3);	// 1M/64,Watch-dog,nRESET,interrupt disable//
		rWTDAT=0xffff;
		rWTCNT=0xffff;	 
		rWTCON=((MCLK/1000000-1)<<8)|(2<<3)|(1<<5); // 1M/64,Watch-dog enable,nRESET,interrupt disable //
	}
	for(;time>0;time--)
		for(i=0;i<delayLoopCount;i++);
	if(adjust==1)
	{
		rWTCON=((MCLK/1000000-1)<<8)|(2<<3);
		i=0xffff-rWTCNT;   //  1count/16us?????????//
		delayLoopCount=8000000/(i*64);	//400*100/(i*64/200)   //
	}
}

//------------------------PORTS------------------------------//