/*********************************************************************************
The?programme?of?the?FIR?filter.
Using?INT2?to?get?the?input?signal.
Array?x?is?the?input?signal?from?A/D?the?length?is?256?32-bit?floating?point.
Array?y?is?the?signal?out?of?filter?the?length?is?256?32-bit?floating?point.
Array?h?is?the?coefficient?of?the?FIR?filter?the?length?is?51?51?order?filter.
**********************************************************************************/
#pragma?CODE_SECTION（vect“vect“）

#include?“stdio.h“
#include?“math.h“
#define?pi?3.1415927
#define?IMR???*（pmem+0x0000）??
#define?IFR???*（pmem+0x0001）??
#define?PMST??*（pmem+0x001D）??
#define?SWCR??*（pmem+0x002B）??
#define?SWWSR?*（pmem+0x0028）?
#define?AL????*（pmem+0x0008）?
#define?CLKMD??0x0058?/*?clock?mode?reg*/

#define?Len?256
#define?FLen?51

double?npassh[FLen]?x[Len]?y[Len]?xmid[FLen];
void?firdes?（double?npass）;

unsigned?int??*pmem=0;
ioport	unsigned?char	port8002;
int?in_x[Len];
int?m?=?0;
int?intnum?=?0;
double?xmean=0;
int?i=0;
int?flag?=?0;
double?fsfstoprrm;
int?ijpk=0;

void?cpu_init（）
{

	
???*（unsigned?int*）CLKMD=0x0;?????????//switch?to?DIV?mode?clkout=?1/2?clkin
?????while（（（*（unsigned?int*）CLKMD）&01）!=0）;
???*（unsigned?int*）CLKMD=0x77ff;??????//switch?to?PLL?X?10?mode
	
	PMST=0x3FA0;
	SWWSR=0x7fff;
	SWCR=0x0000;
	IMR=0;
	IFR=IFR;
}?

interrupt?void?int2（）???
{
	in_x[m]?=?port8002;
	in_x[m]?&=?0x00FF;
	m++;
	intnum?=?m;
	
	if?（intnum?==?Len）
	{
		intnum?=?0;
		
		xmean?=?0.0;
		
		for?（i=0;?i		{
			xmean?=?in_x[i]?+?xmean;
		}		
		
		xmean?=?1.0*xmean/Len;
		
		for?（i=0;?i		{
			x[i]?=?（double）（in_x[i]?-?xmean）;
		}
		
		for?（i=0;?i		{
			for?（p=0;?p???			{
???				xmid[FLen-p-1]?=?xmid[FLen-p-2];
???			}
???			
???			xmid[0]?=?x[i];
????
			r?=?0;
			rm=?0;?
			for?（j=0;?j			{	
?		?		r??=?xmid[j]?*?h[j];
				rm?=?rm?+?r;
???			}
			y[i]?=?rm;
???		}
		
		m=0;
		flag?=?1;
		
	}
}

??void?firdes（double?npass）
??{
??	int?t;
???	for?（t=0;?t??	{
??		h[t]?=?sin（（t-（FLen-1）/2.0）*npass*pi）/（pi*（t-（FLen-1）/2.0））;
??	}
??	if?（t?==?（（FLen-1）/2））?h[t]=npass;
??}
??
?
void?set_int（）????
{
	asm（“?ssbx?intm“）;
	IMR=IMR|0x0004;??
	asm（“?rsbx?intm“）;??
}

void?main（void）
{
	cpu_init（）;
	
??	fs?=?250000;
??	fstop?=?20000;
??	npass?=?fstop/fs;
??	
??	for?（i=0;?i??	{
??		xmid[i]=0;
??	}
??	
??	firdes（npass）;

	set_int（）;

	for（;;）
	{
		if?（flag?==?1）
		{
		???flag?=?0;????/*?set?breakpoint?here?*/

		}
	}
}

void?vect（）
{
???asm（“?.ref?_c_int00“）;??/*pseudoinstruction*/
???asm（“?.ref?_int2“）;

???asm（“?b?_c_int00“）;?????/*?reset?*/??
???asm（“?nop“）;
???asm（“?nop“）;
???asm（“?rete“）;????????
???asm（“?nop“）;
???asm（“?nop“）;
???asm（“?nop“）;
???asm（“?rete“）;
???asm（“?nop“）;
???asm（“?nop“）;
???asm（“?nop“）;
???asm（“?rete“）;
???asm（“?n

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????529??2005-07-18?08:36??exp02_cpu2\Exp-FIR-AD\cc_build_Debug.log

?????文件???????5259??2005-07-18?08:36??exp02_cpu2\Exp-FIR-AD\Debug\Exp-FIR-AD.map

?????文件???????6911??2005-07-18?08:36??exp02_cpu2\Exp-FIR-AD\Debug\Exp-FIR-AD.obj

?????文件???????9377??2005-07-18?08:36??exp02_cpu2\Exp-FIR-AD\Debug\Exp-FIR-AD.out

?????文件????????363??2005-07-18?08:36??exp02_cpu2\Exp-FIR-AD\Debug.lkf

?????文件????????363??2005-07-18?08:36??exp02_cpu2\Exp-FIR-AD\Debug.lkv

?????文件???????1407??2005-07-18?08:37??exp02_cpu2\Exp-FIR-AD\Exp-FIR-AD.paf

?????文件????????933??2005-07-18?08:37??exp02_cpu2\Exp-FIR-AD\Exp-FIR-AD.pjt

?????文件???????5164??2005-07-18?08:36??exp02_cpu2\Exp-FIR-AD.c

?????文件????????401??2004-03-03?09:29??exp02_cpu2\Exp-FIR-AD.cmd

?????文件???????2744??2002-07-29?22:38??exp02_cpu2\math.h

?????文件???????8397??2002-01-25?10:42??exp02_cpu2\MMRegs.h

?????文件?????154882??1999-08-24?10:51??exp02_cpu2\RTS.LIB

?????文件????????114??2001-10-06?20:15??exp02_cpu2\TYPEDEF.H

?????目錄??????????0??2009-05-13?18:32??exp02_cpu2\Exp-FIR-AD\Debug

?????目錄??????????0??2009-05-13?18:32??exp02_cpu2\Exp-FIR-AD

?????目錄??????????0??2009-05-13?18:32??exp02_cpu2

-----------?---------??----------?-----??----

???????????????196844????????????????????17