#define	BAR	0xfff000
#define	VCP(X)	(*(volatile unsigned char *)(X))
#define	VSP(X)	(*(volatile unsigned short *)(X))
#define	VLP(X)	(*(volatile unsigned long *)(X))

#define	I_VEC	VLP(0x134)
#define	TXBD	VSP(0xfff440)
#define	TXBDL	VSP(0xfff442)

#define	RXBD	VSP(0xfff400)
#define	RXBDL	VSP(0xfff402)

#define	RBD	VCP(0xfff487)

#define	SCCE1	VCP(0xfff888)
#define	SCM1	VSP(0xfff884)

#define	ISR	VSP(0xfff818)
#define	IPR	VSP(0xfff814)

extern void isr_serial(void);

extern void int_serial(void);

char input = 'a';
char flag = 0;

char *rxbf = (char *)0xfff180;
char *txbf = (char *)0xfff000;

void start(void)
{
	int i;
		
	SCM1 = 0x01b1;

	RXBD = 0xb000;
	RXBDL = 0x0001;

	RBD = 0;

	I_VEC = (volatile unsigned long *)int_serial;

	SCM1 = 0x01bd;

	flag = 0;
	while(1) {
		if(flag == 0) continue;
		flag = 0;

		if((TXBD & 0x8000) != 0) continue;
	
		if(input == 0x0d) {
			TXBDL = 2;
			*txbf = 0x0a;
			*(txbf + 1) = 0x0d;
		} else {	
			TXBDL = 1;
			*txbf = input;
		}	

		TXBD |= 0x8000;
	}
}

void isr_serial(void)
{
	unsigned char scce;

	scce = SCCE1;

	SCCE1 = 0xff;

	if((scce & 0x01) != 0) {	/* receive */
		input = *rxbf;
		RXBD |= 0x8000;
		flag = 1;
	} 
	if((scce & 0x02) != 0) {	/* transmit */

	}

	ISR = 0x2000;
	IPR = 0x2000;
}