devices.h

嵌入式ARM的一些源代码

/*
 * (C) Copyright 2000
 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), [e-mail]
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <lists.h>

#ifndef _DEVICES_H_
#define _DEVICES_H_

/*
** CONSOLE DEVICES
*/

#define DEV_FLAGS_INPUT		0x00000001	// The device can be used as input console
#define DEV_FLAGS_OUTPUT	0x00000002	// The device can be used as output console
#define DEV_FLAGS_SYSTEM	0x80000000	// The device is a system device
#define DEV_EXT_VIDEO		0x00000001	// Video extensions supported

// Device informations
typedef struct {
	int	flags,		// Device flags: input/output/system
		ext;		// Supported extensions
	char	name[8];	// Device name
	
// GENERAL functions

	int	(*start)(void);	// To start the device
	int	(*stop)(void);	// To stop the device

// OUTPUT functions

	void	(*putc)(const char c) ;	// To put a char
	void	(*puts)(const char *s) ;	// To put a string (accelerator)

// INPUT functions

	int	(*tstc)(void) ;		// To test if a char is ready... 
	int	(*getc)(void) ;		// To get that char
	
// Other functions

	void	*priv ;  		// Private extensions
}	device_t ;

/*
** VIDEO EXTENSIONS
*/

#define VIDEO_FORMAT_RGB_INDEXED	0x0000
#define VIDEO_FORMAT_RGB_DIRECTCOLOR	0x0001
#define VIDEO_FORMAT_YUYV_4_4_4		0x0010
#define VIDEO_FORMAT_YUYV_4_2_2		0x0011

typedef struct {
    void	*address ;	// Address of framebuffer
    unsigned short	
		width,		// Horizontal resolution
		height;		// Vertical resolution
    unsigned char 
		format,		// Format
		colors;		// Colors number or color depth

    void	(*setcolreg)(int,int,int,int);
    void	(*getcolreg)(int, void *);
} video_ext_t ;

/*
** VARIABLES
*/

extern list_t	devlist;
extern device_t	*stdio_devices[] ;
extern char *stdio_names[MAX_FILES] ;

/*
** PROTOTYPES
*/

int device_register (device_t *dev);
int devices_init(void);
int devices_done(void);

#endif	/* _DEVICES_H_ */