minix/lib/sysutil/ser_putc.c
2008-12-11 15:02:44 +00:00

27 lines
727 B
C

#include "sysutil.h"
#include <timers.h>
#define COM1_BASE 0x3F8
#define COM1_THR (COM1_BASE + 0)
#define LSR_THRE 0x20
#define COM1_LSR (COM1_BASE + 5)
/*===========================================================================*
* ser_putc *
*===========================================================================*/
PUBLIC void ser_putc(char c)
{
unsigned long b;
int i;
int lsr, thr;
lsr= COM1_LSR;
thr= COM1_THR;
for (i= 0; i<10000; i++)
{
sys_inb(lsr, &b);
if (b & LSR_THRE)
break;
}
sys_outb(thr, c);
}