#define UART_BASE_ADDR		0x90120000 
#define OFFSET              2
#define RBR					*((short *)(UART_BASE_ADDR+0*OFFSET))	
#define THR					*((short *)(UART_BASE_ADDR+0*OFFSET))	
#define IER					*((short *)(UART_BASE_ADDR+1*OFFSET))
#define IIR					*((short *)(UART_BASE_ADDR+2*OFFSET))	
#define FCR					*((short *)(UART_BASE_ADDR+2*OFFSET))	
#define LCR					*((short *)(UART_BASE_ADDR+3*OFFSET))
#define MCR					*((short *)(UART_BASE_ADDR+4*OFFSET))
#define LSR					*((short *)(UART_BASE_ADDR+5*OFFSET))
#define MSR					*((short *)(UART_BASE_ADDR+6*OFFSET))
#define SCR					*((short *)(UART_BASE_ADDR+7*OFFSET))
#define DLL					*((short *)(UART_BASE_ADDR+0*OFFSET))
#define DLM					*((short *)(UART_BASE_ADDR+1*OFFSET))   
#define CECTL1	            *((long *)0x01800004) 
void wait(int nWait);

char cString[17]={ "Hello PC!,Over|" },cReceive,cBuffer[17],cAnswer[16]={"Oh,you say"};
int bReceive,nLen;

main()
{
	unsigned int uWork;
	int i,k;
	
	bReceive=0;
	LCR = 0x80; 
	DLL = 0x18;    
	DLM = 0x00;  
	LCR = 0x03;    
	FCR = 0x01;
	MCR = 0x20;
	IER = 0x00;      
	
	while ( 1 )
	{
		if ( bReceive==0 )
		{
			for ( i=0;i<16;i++ )
			{
				do
				{ 
					uWork=LSR;
				} while ( uWork&0x040 != 0x040 );
				THR=cString[i];
				wait(1024);		
			}
		}
		else
		{
			for ( i=0;i<10;i++ )
			{
				do
				{ 
					uWork=LSR;
				} while ( uWork&0x040 != 0x040 );
				THR=cAnswer[i];
				wait(1024);		
			}
			do
			{ 
				uWork=LSR;
			} while ( uWork&0x040 != 0x040 );
			THR='\"';
			for ( i=0;i<nLen;i++ )
			{
				do
				{ 
					uWork=LSR;
				} while ( uWork&0x040 != 0x040 );
				THR=cBuffer[i];
				wait(1024);		
			}
			do
			{ 
				uWork=LSR;
			} while ( uWork&0x040 != 0x040 );
			THR='\"';
			wait(1024);		
			for ( i=9;i<16;i++ )
			{
				do
				{ 
					uWork=LSR;
				} while ( uWork&0x040 != 0x040 );
				THR=cString[i];
				wait(1024);		
			}
		}
		k=0; bReceive=0;
		while ( 1 )
		{
			do
			{
				uWork=LSR;
			} while ( (uWork&1)==0 );
			cReceive=RBR;
			cBuffer[k]=cReceive&0x0ff; 
			if ( cReceive=='.' )
			{
				cBuffer[k+1]='\0';
				nLen=k+1;
				bReceive=1;
				break;
			}
			k++; k%=16;
		}
	}
}

void wait(int nWait)
{
	int i,j,k=0;
	for ( i=0;i<nWait;i++ )
		for ( j=0;j<64;j++ )
			k++;
}