串行I/O通信

[c]代码库

#include <bios.h>
#include <conio.h>

#define COM1       0
#define DATA_READY 0x100
#define TRUE       1
#define FALSE      0

#define SETTINGS ( 0x80 | 0x02 | 0x00 | 0x00)

int main ( void )
{
	int in, out, status, DONE = FALSE;

	bioscom ( 0, SETTINGS, COM1 );
	cprintf ( "... BIOSCOM [ESC] to exit ...\n" );
	while ( !DONE )
	{
		status = bioscom ( 3, 0, COM1 );
		if ( status & DATA_READY )
			if ( ( out = bioscom ( 2, 0, COM1 ) & 0x7F ) != 0 )
				putch ( out );
		if ( kbhit() )
		{
			if ( ( in = getch() ) == '\x1B' )
				DONE = TRUE;
			bioscom ( 1, in, COM1 );
		}
	}
	return 0;
}