// CCS2.1下測試通過


// 定義數據存儲結構

typedef struct
{
	int  PrevValue;  // 前一次轉換時的數據
	int  PrevIndex;  // 前一此轉換時使用的索引
	int  Length;     // 轉換數據長度
	int* pBufferIn;  // 輸入緩沖區地址
	int* pBufferOut; // 輸出緩沖區地址
}ADPCM_STRUCT;

ADPCM_STRUCT AdpcmState;
// 編碼函數申明
extern void AdpcmEncoder(int* pBufferIn,  int* pBufferOut, 
					     int* pPrevValue, int* pPrevIndex, int Length);
// 解碼函數申明					    					     
extern void AdpcmDecoder(int* pBufferIn,  int* pBufferOut, 
					     int* pPrevValue, int* pPrevIndex, int Length);

int i,BufferIn[80],BufferOut[20];


#define TEST_VALUE 100

void main(void)
{
	asm(" STM #0,SWWSR");
	
	for(i=0; i<40; i++)
	{
		BufferIn[i] = i*TEST_VALUE;
	}
	for(i=40; i<80; i++)
	{
		BufferIn[i] = (80-i)*TEST_VALUE;
	}
	for(i=0; i<20; i++)
	{
		BufferOut[i] = 0; 
	}
	
	AdpcmState.PrevValue = 0;
	AdpcmState.PrevIndex = 0;
	AdpcmState.Length = 80;
	AdpcmState.pBufferIn = BufferIn;
	AdpcmState.pBufferOut = BufferOut;
	AdpcmEncoder(AdpcmState.pBufferIn, AdpcmState.pBufferOut, 
				 &AdpcmState.PrevValue, &AdpcmState.PrevIndex,
				 AdpcmState.Length);
	AdpcmState.PrevValue = 0;
	AdpcmState.PrevIndex = 0;
	AdpcmState.Length = 20;
	AdpcmState.pBufferIn = BufferOut;
	AdpcmState.pBufferOut = BufferIn;
	AdpcmDecoder(AdpcmState.pBufferIn, AdpcmState.pBufferOut, 
				&AdpcmState.PrevValue, &AdpcmState.PrevIndex,
				AdpcmState.Length);
}