process_data.c

基于visual dsp++开发环境

#include "Talkthrough.h"
#include "btc.h"

int nValue;
extern int BTCLeftVolume;
extern int BTCRightVolume;
extern int iChannel0LeftIn;
extern int iChannel0RightIn;
extern int iChannel0LeftOut;
extern int iChannel0RightOut;

//--------------------------------------------------------------------------//
// Function:	Process_Data()												//
//																			//
// Description: This function is called from inside the SPORT0 ISR every 	//
//				time a complete audio frame has been received. The new 		//
//				input samples can be found in the variables iChannel0LeftIn,//
//				iChannel0RightIn respectively. The processed data should be //
//				stored in iChannel0LeftOut, iChannel0RightOut respectively.	//			//			//
//--------------------------------------------------------------------------//
void Process_Data(void)
{

	nValue = ((iChannel0LeftIn << 8) >> 8);  	//preserve sign
	nValue = (nValue >> BTCLeftVolume);	//volume
	btc_write_value(0, (unsigned int*)&nValue, sizeof(nValue));

	iChannel0LeftOut = nValue;

	nValue = ((iChannel0RightIn << 8) >> 8);	//preserve sign
	nValue = (nValue >> BTCRightVolume);//volume
	btc_write_value(1, (unsigned int*)&nValue, sizeof(nValue));
	
	iChannel0RightOut = nValue;
	
}