Uhrzeit anzeigen

[Servus]

Hallo,

hat jemand ein Codebeispiel, wie man die Zeit anzeigen kann, ich meine eine bios-funktion, die ich in mein os einbinden könnte.also die zeit,die im bios eingestellt ist.Danke

[Patrick]

Hi,

hier was zum cmos auslesen:

/*--------------------------------------------------------------------------------------------------
File Name : cmos.h      Purpose : Declarations for accessing CMOS
--------------------------------------------------------------------------------------------------*/

#ifndef __cmos_h__
#define __cmos_h__

typedef struct time_str_tag
{
	int hour;
	int minute;
	int second;
}time_stamp;

typedef struct date_str_tag
{
	int year;
	int month;
	int date;
	int day;
}date_stamp;

class Cmos
{
	public:
		int read(unsigned char);
		int read_bcd(unsigned char address);
		void time(time_stamp &);
		void date(date_stamp &);

	private:
		bool busy();
		int bcd2bin(unsigned char);
};

#define CMOS_OUT_PORT 0x70
#define CMOS_IN_PORT 0x71

#define SECOND 0x00
#define MINUTE 0x02
#define HOUR 0x04
#define DAY 0x06
#define DATE 0x07
#define MONTH 0x08
#define YEAR 0x09
#define STATUS_A 0x0A
#define STATUS_B 0x0B
#define STATUS_C 0x0C
#define STATUS_D 0x0D

#endif

und nun die Cpp:

#include "cmos.h"

int Cmos::read(unsigned char address)		//reads a byte out of the cmos
{
	while(busy());
	outportb(CMOS_OUT_PORT, 0x80|address);	//Use 0x80 coz we need to disable NMI
	return inportb(CMOS_IN_PORT);
}

int Cmos::read_bcd(unsigned char address)
{
	return bcd2bin(read(address));
}

bool Cmos::busy()							//checks if the cmos is ready
{
	outportb(CMOS_OUT_PORT, 0x80|STATUS_A);
	if(inportb(CMOS_IN_PORT) & 0x80)		//Bit 7 is set in Status Register A if Clock is busy
		return true;
	else
		return false;
}

int Cmos::bcd2bin(unsigned char bcd)		//binary coded decimal to binary converter
{
	return((bcd & 0xF) + ((bcd >> 4) * 10));
}

void Cmos::time(time_stamp &time)			//gets the time from the cmos
{
	time.second = read_bcd(SECOND);
	time.minute = read_bcd(MINUTE);
	time.hour   = read_bcd(HOUR);
}

void Cmos::date(date_stamp &date)			//gets the date from the cmos
{
	date.year  = (read_bcd(0x32) * 100) + read_bcd(YEAR);	//0x32 is the century number in the cmos
	date.month = read_bcd(MONTH);
	date.date  = read_bcd(DATE);
	date.day   = read_bcd(DAY);
}

Ich hoffe das reicht

[Servus]

danke, aber ich wollts in assembler-code (x86)

[Patrick]

Hi,

okay nur noch die paar Funktionen dann solltest du echt keine Probleme haben das auf x86 umzuschreiben

inline static unsigned char inportb(int port)
{
	register unsigned char r;

   	asm volatile
	( 
		"inb %%dx, %%al\n\t" 
		: "=a" (r) 
		: "d" (port)
	);

   	return (r);
}

inline static void outportb(int port, unsigned char data)
{
	asm volatile
	(
		"outb %%al, %%dx\n\t" 
		:
		: "a" (data), "d" (port)
	);
}

inline static unsigned short inportw(int port)
{
	register unsigned short r;

   	asm volatile
	(
		"inw %%dx, %%ax\n\t" 
		: "=a" (r) 
		: "d" (port)
	);

   	return (r);
}

inline static void outportw(int port, unsigned short data)
{
	asm volatile
	(
		"outw %%ax, %%dx\n\t" 
		:
		: "a" (data), "d" (port)
	);
}

Alles Assembler funzt super unter GCC

[bluecode]

hi,

du kannst das ganze auch über
BIOS-Interrupt 1Ah (Funktion 0x02) machen, solange dein OS im Real-Mode arbeitet (oder im Virtual86-Mode).