usb_io.c File Reference

#include <string.h>
#include <usb.h>
#include "base.h"
#include "libnjb.h"
#include "ioutil.h"
#include "usb_io.h"
#include "njb_error.h"

Functions
ssize_t	usb_pipe_write (njb_t *njb, void *buf, size_t nbytes)
ssize_t	usb_pipe_read (njb_t *njb, void *buf, size_t nbytes)
int	usb_setup (njb_t *njb, int type, int request, int value, int index, int length, void *data)
Variables
int	__sub_depth

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Detailed Description

This file contain some USB-specific code that is used by all devices.

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Function Documentation

ssize_t usb_pipe_read	(	njb_t *	njb,
		void *	buf,
		size_t	nbytes
	)

This function reads a chunk of bytes to a buffer from a device's IN endpoint.

Parameters:

	njb	the jukebox object to use
	buf	the buffer to store the bytes in
	nbytes	the number of bytes to read in

Returns:

the number of bytes actually read

ssize_t usb_pipe_write	(	njb_t *	njb,
		void *	buf,
		size_t	nbytes
	)

This function writes a number of bytes from a buffer to a devices OUT endpoint.

Parameters:

	njb	the jukebox object to use
	buf	the buffer to send bytes from
	nbytes	the number of bytes to write

Returns:

the number of bytes actually written

int usb_setup	(	njb_t *	njb,
		int	type,
		int	request,
		int	value,
		int	index,
		int	length,
		void *	data
	)

This function sends a USB SETUP 8-byte command across to endpoint 0 on the device.

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Variable Documentation

int __sub_depth

The current subroutine depth for all of libnjb (global)

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