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This commit is contained in:
Ben Gras 2008-12-11 14:55:06 +00:00
parent 70f1f28439
commit fe3e0181d4
1 changed files with 27 additions and 0 deletions
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lib/sysutil/ser_putc.c Normal file
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#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 int 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);
}