www.pudn.com > lab01-UseCC.rar > volume.c

#include "DSP281x_Device.h"     // DSP281x Headerfile Include File 
#include "DSP281x_Examples.h"   // DSP281x Examples Include File 
#include "f2812a.h" 
#include "volume.h" 
 
int inp_buffer[BUF_SIZE];	/* BUF_SIZEµÄ¶¨Òå¼ûvolume.h */ 
int out_buffer[BUF_SIZE]; 
 
int *input; 
int *output; 
 
int volume = 1; 
 
struct PARMS str =  
{ 
	2934,9432,213,9432,&str 
}; 
 
/***************************************************************************/ 
/*                                                                         */ 
/* NAME: read_signals()                                                    */ 
/*                                                                         */ 
/* FUNCTION: read input signal.                                            */ 
/*                                                                         */ 
/* PARAMETERS: none.                                                       */ 
/*                                                                         */ 
/* RETURN VALUE: TRUE.                                                     */ 
/*                                                                         */ 
/***************************************************************************/ 
int read_signals(int *input) 
{ 
	/* read reference signal */ 
	/* read input signal */ 
	return(TRUE); 
} 
 
/***************************************************************************/ 
/*                                                                         */ 
/* NAME: write_buffer()                                                    */ 
/*                                                                         */ 
/* FUNCTION: write to the output buffer. Use the volume variable 		   */ 
/*			 to control the volume.						                   */ 
/*                                                                         */ 
/* PARAMETERS: input , output, num.                                        */ 
/*                                                                         */ 
/* RETURN VALUE: TRUE.                                                     */ 
/*                                                                         */ 
/***************************************************************************/ 
int write_buffer(int *input,int *output,int count) 
{ 
	while( count--) 
	{ 
		*output++ = (*input++) * volume; 
	} 
	return(TRUE); 
} 
 
/***************************************************************************/ 
/*                                                                         */ 
/* NAME: main()                                                            */ 
/*                                                                         */ 
/* FUNCTION: Volume Control: Read input buffer							   */ 
/*           multiply by volume coeficient and write to                    */ 
/*			 output buffer.												   */ 
/*                                                                         */ 
/* PARAMETERS: none.                                                       */ 
/*                                                                         */ 
/* RETURN VALUE: none.                                                     */ 
/*                                                                         */ 
/***************************************************************************/ 
void main(void) 
{   int num = BUF_SIZE; 
    InitSysCtrl(); 
    while(TRUE)  /* loop forever */ 
	{                
		input = &inp_buffer[0];  
		output = &out_buffer[0]; 
		/* read input signals from PC file */ 
		read_signals(input); 
		 
		/* write to output buffer 		*/ 
		write_buffer(input, output, num); 
	} 
    
 
}