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lualibusb

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资源说明：Lua libusb binding

Lua-libusb Binding.


Authors
=======

Jorge Visca 
Andres Aguirre 

Copyright 2008 MINA Group, Facultad de Ingenieria, Universidad de la
Republica, Uruguay.

See LICENSE

	
Intro
=====

For sample usage, see test.lua	
Tested on Linux, with libusb 0.1.12


Functions
==========

The following correspond to functions in libusb.h . For reference, 
see http://libusb.sourceforge.net/doc/functions.html
 
find_busses()
	Returns a number
 
find_devices(bus)
	Returns a number
	 
get_busses()
	Returns a dirname->bus_handler map

get_devices(bus_handler)
	Returns a filename->device map

open(device)
	Returns a dev_handle

close(dev_handle)
	Returns true if success. In case of failure returns nil followed by error code.
	
set_configuration(dev_handle, configuration)
	configuration is a number
	Returns true if success. In case of failure returns nil followed by error code.

set_altinterface(dev_handle, alternative)
	configuration is a number
	Returns true if success. In case of failure returns nil followed by error code.
	
clear_halt(dev_handle, ep)
	ep is a number
	Returns true if success. In case of failure returns nil followed by error code.

reset(dev_handle)
	Returns true if success. In case of failure returns nil followed by error code.

claim_interface(dev_handle, interface)
	interface is a number
	Returns true if success. In case of failure returns nil followed by error code.

release_interface(dev_handle, interface)
	interface is a number
	Returns true if success. In case of failure returns nil followed by error code.
		
control_msg(dev_handle,requesttype,request,value,index,bytes,timeout)
	requesttype,request,value,index and timeout are numbers
	bytes is a string
	Returns a number if success. In case of failure returns nil followed by error code.


get_string_simple(dev_handle,index,buflen)
	index is a number
	buflen is a number, if missing or 0 defaults to 255
	Returns a string. In case of failure returns nil followed by error code.

TODO: usb_get_string

get_descriptor(dev_handle,type,index,size)
	type and index are numbers (0..255)
	size is a number, if missing or 0 defaults to 255
	Returns a string. In case of failure returns nil followed by error code.
	
get_descriptor_by_endpoint(dev_handle,ep,type,index,size)
	type and index are numbers (0..255)
	ep is a numbers
	size is a number, if missing or 0 defaults to 255
	Returns a string. In case of failure returns nil followed by error code.
		
bulk_write(dev_handle,ep,bytes,timeout)
	ep and timeout are numbers
	bytes is a string
	Returns a number. In case of failure returns nil followed by error code.

bulk_read(dev_handle,ep,size,timeout)
	ep, size and timeout are numbers
	Returns a string. In case of failure returns nil followed by error code.
	
interrupt_write(dev_handle,ep,bytes,timeout)
	ep and timeout are numbers
	bytes is a string
	Returns a number. In case of failure returns nil followed by error code.

interrupt_read(dev_handle,ep,size,timeout)
	ep, size and timeout are numbers
	Returns a string. In case of failure returns nil followed by error code.
 
 
Data
====

The following functions access data in libusb.h structs. For reference, 
see http://libusb.sourceforge.net/api-1.0/annotated.html . 
device_descriptor, 
device_config and endpoint_descriptor return a table that maps the name of the 
attribute to it's value. 
interface_alt_settings returns an array of tables (a table for each alternative), 
where each table maps the name of the attribute to it's value.
Most of these values are numbers, except the "extra"'s, which are strings, and 
"endpoint" and "interface" which are handlers.   

device_descriptor(device)

device_config(device)

interface_alt_settings(interface)

endpoint_descriptor(endpoint_handler)


Constants
=========

The library exports the #defined constants from libusb.h . For your convenience. 


===
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