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/* ----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support
* ----------------------------------------------------------------------------
* Copyright (c) 2008, Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ----------------------------------------------------------------------------
*/
/*
Title: USBConfigurationDescriptor implementation
About: Purpose
Implementation of the USBConfigurationDescriptor class.
*/
//-----------------------------------------------------------------------------
// Headers
//-----------------------------------------------------------------------------
#include "USBConfigurationDescriptor.h"
//-----------------------------------------------------------------------------
// Exported functions
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/// Returns the total length of a configuration, i.e. including the
/// descriptors following it.
/// \param configuration Pointer to a USBConfigurationDescriptor instance.
/// \return Total length (in bytes) of the configuration.
//-----------------------------------------------------------------------------
unsigned int USBConfigurationDescriptor_GetTotalLength(
const USBConfigurationDescriptor *configuration)
{
return configuration->wTotalLength;
}
//-----------------------------------------------------------------------------
/// Returns the number of interfaces in a configuration.
/// \param configuration Pointer to a USBConfigurationDescriptor instance.
/// \return Number of interfaces in configuration.
//-----------------------------------------------------------------------------
unsigned char USBConfigurationDescriptor_GetNumInterfaces(
const USBConfigurationDescriptor *configuration)
{
return configuration->bNumInterfaces;
}
//-----------------------------------------------------------------------------
/// Indicates if the device is self-powered when in a given configuration.
/// \param configuration Pointer to a USBConfigurationDescriptor instance.
/// \return 1 if the device is self-powered when in the given configuration;
/// otherwise 0.
//-----------------------------------------------------------------------------
unsigned char USBConfigurationDescriptor_IsSelfPowered(
const USBConfigurationDescriptor *configuration)
{
if ((configuration->bmAttributes & (1 << 6)) != 0) {
return 1;
}
else {
return 0;
}
}
//-----------------------------------------------------------------------------
/// Parses the given Configuration descriptor (followed by relevant
/// interface, endpoint and class-specific descriptors) into three arrays.
/// *Each array must have its size equal or greater to the number of
/// descriptors it stores plus one*. A null-value is inserted after the last
/// descriptor of each type to indicate the array end.
///
/// Note that if the pointer to an array is null (0), nothing is stored in
/// it.
/// \param configuration Pointer to the start of the whole Configuration
/// descriptor.
/// \param interfaces Pointer to the Interface descriptor array.
/// \param endpoints Pointer to the Endpoint descriptor array.
/// \param others Pointer to the class-specific descriptor array.
//-----------------------------------------------------------------------------
void USBConfigurationDescriptor_Parse(
const USBConfigurationDescriptor *configuration,
USBInterfaceDescriptor **interfaces,
USBEndpointDescriptor **endpoints,
USBGenericDescriptor **others)
{
// Get size of configuration to parse
int size = USBConfigurationDescriptor_GetTotalLength(configuration);
size -= sizeof(USBConfigurationDescriptor);
// Start parsing descriptors
USBGenericDescriptor *descriptor = (USBGenericDescriptor *) configuration;
while (size > 0) {
// Get next descriptor
descriptor = USBGenericDescriptor_GetNextDescriptor(descriptor);
size -= USBGenericDescriptor_GetLength(descriptor);
// Store descriptor in correponding array
if (USBGenericDescriptor_GetType(descriptor)
== USBGenericDescriptor_INTERFACE) {
if (interfaces) {
*interfaces = (USBInterfaceDescriptor *) descriptor;
interfaces++;
}
}
else if (USBGenericDescriptor_GetType(descriptor)
== USBGenericDescriptor_ENDPOINT) {
if (endpoints) {
*endpoints = (USBEndpointDescriptor *) descriptor;
endpoints++;
}
}
else if (others) {
*others = descriptor;
others++;
}
}
// Null-terminate arrays
if (interfaces) {
*interfaces = 0;
}
if (endpoints) {
*endpoints = 0;
}
if (others) {
*others = 0;
}
}
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