diff options
Diffstat (limited to 'at91lib/usb/common/core/USBConfigurationDescriptor.c')
| -rw-r--r-- | at91lib/usb/common/core/USBConfigurationDescriptor.c | 162 |
1 files changed, 162 insertions, 0 deletions
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;
+ }
+}
+
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