#include "sercom.h"

/* 
 *	initialize port 
 */

void init_port()
{
	old_com_isr=getvect(IRQ4);
	setvect(IRQ4,new_com_isr);

	/* port parameter initialze */
	bioscom(0,DATA8|STOP1|NOPA|B9600,COM1);

	/* MCR set */
	outportb(MCR,0x0b);

	/* COM Interrupt enable */
	outportb(IER,0x01);

	/* 8259 PIC mask bit set */
	outportb(PICMSK,(inportb(PICMSK)&(ONMSK)));


}

/* COM interrupt disable and restore parameters */

void close_port()
{
	/* MCR reset */
	outportb(MCR,0x0);

	/* COM Interrupt disable */
	outportb(IER,0);

	/* 8259 PIC mask bit restore */
	outportb(PICMSK,(inportb(PICMSK)|OFFMSK));

	setvect(IRQ4,old_com_isr);

}