lowpass.c

低通滤波源码

#include <string.h>
#include <stdlib.h>
#include "table.h"
#include "globleio.h"
/////////////////////////////////////////////////////////////////////////////
#define first_half 0x0001
#define half_empty 0x0002
/////////////////////////////////////////////////////////////////////////////
#pragma DATA_SECTION(RxBuf,  "dmrx_sect")
signed int RxBuf[256];
#pragma DATA_SECTION(TxBuf,  "dmtx_sect")
signed int TxBuf[128];
#pragma DATA_SECTION(CirBuf,  "circle_sect")
signed int CirBuf[96];
unsigned int status;
extern void dspinit();
extern void bsp0init();
extern void bsp1init();
extern void dmainit();
extern void bspstop();
extern firloop(signed int *DestAddr);
extern firlooptest(signed int *DestAddr);
/////////////////////////////////////////////////////////////
int *RxIndex,*CirBufIndex;
unsigned int i;
unsigned int st_portc;
/////////////////////////////////////////////////////////////

void main()
{
	dspinit();
	for(i=0;i<1024;i++)
	{
		TxBuf[i]=0;
	}
	dmainit();
	bsp0init();
	bsp1init();
	
	st_portc=0xffff;
	st_portc&=~BSP_C1;
	portcfee=st_portc;
	
	
	RxIndex=TxBuf;
	CirBufIndex=CirBuf;
	status=0;
	st_portc|=DA_LDAC;
	portcfee=st_portc;
	st_portc&=~DA_LDAC;
	portcfee=st_portc;
	asm(" STM #3fffh, IFR");
	asm(" STM #3000h, IMR");
	asm(" RSBX INTM");
	while(1)
	{
		asm(" RSBX XF");
		if((status&half_empty)==half_empty)
		{
			asm(" SSBX XF");
			status&=~half_empty;
			if((status&first_half)==first_half)
			{
				firloop(TxBuf);
//				firlooptest(TxBuf);
			}
			else
			{
				firloop(&TxBuf[64]);
//				firlooptest(&TxBuf[512]);
			}
		}
	}
}


interrupt void dmtx()
{
	asm(" STM #3fffh, IFR");
	if((status&first_half)==first_half)
	{
		status&=~first_half;
		status|=half_empty;
	}
	else
	{
		status|=first_half;
		status|=half_empty;
	}
}