dmac2isr.c

DSP C5402 下的DMA滤波程序利用2通道输入

#include <codec.h>
#include <firlab.h>

extern  void delay(s16 period);
extern	unsigned int channel;      /*IN: DMA channel number              */
extern	unsigned int dmsefc;       /*IN: Value to set sync & fr reg      */
extern	unsigned int dmmcr;        /*IN: Value to set mode control reg   */
extern	unsigned int dmctr;	   	  /*IN: Value to set element count reg  */
extern	unsigned int src_page;     /*IN: Value to set source page reg    */
extern	unsigned int src_addr;     /*IN: Value to set source addr reg    */
extern	unsigned int dst_page;     /*IN: Value to set dest page reg      */
extern	unsigned int dst_addr;     /*IN: Value to set dest addr reg      */

extern int inp_buffer[0x200];
extern int out_buffer[0x200];
extern int coeffs[16];
extern int delaybuff[16]; 
extern int frame; 
extern int flag;
extern int currbuff;
extern int *delayptr1;

int L=0;
void	init_dma3(void)
{
	    	while(DMPREC&0x0008) {};	//DMA3的传送是否结束
	    
	    	/* Initialize DMA channel 3 */

			dmsefc = ((DSYNC_REVT1 <<12));
    		dmmcr = 0x4141;	
       		dmctr = 0xFF;			//256 element/frame
       	    src_addr = (unsigned int) &out_buffer+((unsigned int)frame*0x100);
       		dst_addr = DXR1_ADDR(HANDSET_CODEC);

    		dma_init(DMA_CH3, dmsefc, dmmcr, dmctr, SPACE_DATA, src_addr, SPACE_DATA, dst_addr);

		/* Set number of frames for channel 3 */
    
    		DMA_FRAMECOUNT(DMA_CH3, 0);		//2 frame/block
    		
    		/* Enable channel 3 */

    		DMA_ENABLE(DMA_CH3);
}

interrupt void DMAC2ISR(void)
{
	int *p_inp,*p_out; 
    int i;
		
	p_inp=inp_buffer+frame*0x100;
	p_out=out_buffer+frame*0x100;


	
	fir(p_inp,coeffs,p_out,&delayptr1,16,256);

	
	
//	for (i=0;i<256;i++)
//		*(p_out+i)=*(p_inp+i);

   init_dma3();
	frame^=1;
 
}