filter.c

合众达SEED-DTK2812 光盘内容 DSP源码 用户指南 实验手册

/******************************************************************************/
/*  Copyright 2004 by SEED Electronic Technology LTD.                         */
/*  All rights reserved. SEED Electronic Technology LTD.                      */
/*  Restricted rights to use, duplicate or disclose this code are             */
/*  granted through contract.                                                 */
/*  FILENAME...... iir_filter.c											  */
/*  PROJECT....... Read and write on-board daram memory of TMS320VC5502	      */
/*  作者: gao		                                                          */
/*  版本:1.0                                                                  */
/*  日期:06.11.10                                                             */
/******************************************************************************/
#include "DSP28_Device.h"
#include "filter.h"
#include "ext_inf.h"

/******************************************************/
unsigned int DataLong=1024;  //采样点数1024
////////////////////////////////
unsigned int adconvover = 0;
unsigned int convcount = 0;
unsigned short Ad_data[2048]={0};
short Ad_data_signed[2048];
/////////////////////////////////
short filter_result[1024];
///////////////
unsigned int i,j;
unsigned int k= 0;
/****************************************************/
interrupt void ISRTimer2(void);
interrupt void ad(void);
/*****************************************************/
void main(void)
{

/*****************************************/	
	/*初始化系统*/
	InitSysCtrl();
	/*关中断*/
	DINT;
	IER = 0x0000;
	IFR = 0x0000;

	/*初始化PIE中断*/
	InitPieCtrl();

	/*初始化PIE中断矢量表*/
	InitPieVectTable();	

    //初始化cputimer
    InitCpuTimers();

 	/*设置中断服务程序入口地址*/
	EALLOW;	// This is needed to write to EALLOW protected registers
	PieVectTable.TINT2 = &ISRTimer2;
	PieVectTable.ADCINT = &ad;
	EDIS;   // This is needed to disable write to EALLOW protected registers
	
	/*开中断*/
	IER |= M_INT1;//ADC中断
	
	EINT;   // Enable Global interrupt INTM
	ERTM;	// Enable Global realtime interrupt DBGM



	/*设置CPU*/
	DINT;
	ConfigCpuTimer(&CpuTimer2, 150, 22);	
 	StartCpuTimer2();
   		 /*开中断*/
	IER |= M_INT14;
	EINT;
	InitAdc();	
		
	for(;;)
	{					
		if (adconvover==1){
			/*AD采样结束*/				
			for(i=0;i<DataLong;i++){
	  			Ad_data_signed[i]=(short)(Ad_data[i]-0x5555);
			}	

           	iir_filter(Ad_data_signed,SOSr,G,filter_result,DataLong,ROUND_IIR);	
			adconvover=0;								
		}
	}
} 	

interrupt void ad(void)
{
	IFR=0x0000;
	PieCtrl.PIEACK.all=0xffff;
	if(adconvover==0){
		Ad_data[convcount] = AdcRegs.RESULT0;
		convcount++;
	}
	if (convcount==DataLong){
  		convcount=0;
 		adconvover=1;//接满标志	
 	}
}

interrupt void ISRTimer2(void)
{
//	AdcRegs.ADCTRL2.bit.RST_SEQ1=1;
	AdcRegs.ADC_ST_FLAG.bit.INT_SEQ1_CLR=1;
	AdcRegs.ADCTRL2.bit.SOC_SEQ1=1;	
	
}



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// No more.
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