From 98f9d442b44dbe2e3e4b3c8296be7e78d5d05450 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Sun, 24 Jul 2011 09:39:28 +0200 Subject: initial import of the usb ccid example for the sam7s --- .../usb/common/core/USBConfigurationDescriptor.c | 162 +++++++++++++++++++++ 1 file changed, 162 insertions(+) create mode 100644 at91lib/usb/common/core/USBConfigurationDescriptor.c (limited to 'at91lib/usb/common/core/USBConfigurationDescriptor.c') diff --git a/at91lib/usb/common/core/USBConfigurationDescriptor.c b/at91lib/usb/common/core/USBConfigurationDescriptor.c new file mode 100644 index 0000000..503dceb --- /dev/null +++ b/at91lib/usb/common/core/USBConfigurationDescriptor.c @@ -0,0 +1,162 @@ +/* ---------------------------------------------------------------------------- + * 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; + } +} + -- cgit v1.2.3