_NUTDEVICE Struct Reference
[Device Management]

#include <device.h>

Collaboration diagram for _NUTDEVICE:

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Detailed Description

Device structure.

Each device driver provides a global variable of this type. Applications use NutRegisterDevice() to bind the device driver to the application code. Except this call, applications refer to device drivers by the name of the device when using standard C functions like _open() or fopen().

More than one device driver may be available for the same hardware device. Typically these drivers provide the same name for the device and applications must not refer to more than one device driver with the same name.

Data Fields
NUTDEVICE *	dev_next
	Link to the next device structure.
char	dev_name [9]
	Unique device name.
u_char	dev_type
	Type of interface.
uptr_t	dev_base
	Hardware base address.
u_char	dev_irq
	Interrupt registration number.
void *	dev_icb
	Interface control block.
void *	dev_dcb
	Driver control block.
int(*	dev_init )(NUTDEVICE *)
	Driver initialization routine.
int(*	dev_ioctl )(NUTDEVICE *, int, void *)
	Driver control function.
int(*	dev_read )(NUTFILE *, void *, int)
	Read from device.
int(*	dev_write )(NUTFILE *, CONST void *, int)
	Write to device.
int(*	dev_write_P )(NUTFILE *, PGM_P, int)
	Write to device.
NUTFILE *(*	dev_open )(NUTDEVICE *, CONST char *, int, int)
	Open a device or file.
int(*	dev_close )(NUTFILE *)
	Close a device or file.
long(*	dev_size )(NUTFILE *)
	Request file size.

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Field Documentation

u_char _NUTDEVICE::dev_type

Type of interface. May be any of the following: IFTYP_RAM IFTYP_ROM IFTYP_STREAM IFTYP_NET IFTYP_TCPSOCK IFTYP_CHAR

uptr_t _NUTDEVICE::dev_base

Hardware base address. Will be set by calling NutRegisterDevice(). On some device drivers this address may be fixed.

u_char _NUTDEVICE::dev_irq

Interrupt registration number. Will be set by calling NutRegisterDevice(). On some device drivers the interrupt may be fixed.

void* _NUTDEVICE::dev_icb

Interface control block. With stream devices, this points to the IFSTREAM structure and with network devices this is a pointer to the IFNET structure.

void* _NUTDEVICE::dev_dcb

Driver control block. Points to a device specific information block. Examples: pppc/pppc.c.

int(* _NUTDEVICE::dev_init)(NUTDEVICE *)

Driver initialization routine. This routine is called during device registration.

int(* _NUTDEVICE::dev_ioctl)(NUTDEVICE *, int, void *)

Driver control function. Used to modify or query device specific settings.

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