You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
186 lines
7.5 KiB
186 lines
7.5 KiB
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2009.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.fourwalledcubicle.com
|
|
*/
|
|
|
|
/*
|
|
Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
|
|
|
|
Permission to use, copy, modify, distribute, and sell this
|
|
software and its documentation for any purpose is hereby granted
|
|
without fee, provided that the above copyright notice appear in
|
|
all copies and that both that the copyright notice and this
|
|
permission notice and warranty disclaimer appear in supporting
|
|
documentation, and that the name of the author not be used in
|
|
advertising or publicity pertaining to distribution of the
|
|
software without specific, written prior permission.
|
|
|
|
The author disclaim all warranties with regard to this
|
|
software, including all implied warranties of merchantability
|
|
and fitness. In no event shall the author be liable for any
|
|
special, indirect or consequential damages or any damages
|
|
whatsoever resulting from loss of use, data or profits, whether
|
|
in an action of contract, negligence or other tortious action,
|
|
arising out of or in connection with the use or performance of
|
|
this software.
|
|
*/
|
|
|
|
/** \file
|
|
*
|
|
* USB Device Configuration Descriptor processing routines, to determine the correct pipe configurations
|
|
* needed to communication with an attached USB device. Descriptors are special computer-readable structures
|
|
* which the host requests upon device enumeration, to determine the device's capabilities and functions.
|
|
*/
|
|
|
|
#include "ConfigDescriptor.h"
|
|
|
|
/** Reads and processes an attached device's descriptors, to determine compatibility and pipe configurations. This
|
|
* routine will read in the entire configuration descriptor, and configure the hosts pipes to correctly communicate
|
|
* with compatible devices.
|
|
*
|
|
* This routine searches for a SI interface descriptor containing bulk IN and OUT data endpoints.
|
|
*
|
|
* \return An error code from the \ref StillImageHost_GetConfigDescriptorDataCodes_t enum.
|
|
*/
|
|
uint8_t ProcessConfigurationDescriptor(void)
|
|
{
|
|
uint8_t ConfigDescriptorData[512];
|
|
void* CurrConfigLocation = ConfigDescriptorData;
|
|
uint16_t CurrConfigBytesRem;
|
|
uint8_t FoundEndpoints = 0;
|
|
|
|
/* Retrieve the entire configuration descriptor into the allocated buffer */
|
|
switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
|
|
{
|
|
case HOST_GETCONFIG_Successful:
|
|
break;
|
|
case HOST_GETCONFIG_InvalidData:
|
|
return InvalidConfigDataReturned;
|
|
case HOST_GETCONFIG_BuffOverflow:
|
|
return DescriptorTooLarge;
|
|
default:
|
|
return ControlError;
|
|
}
|
|
|
|
/* Get the Still Image interface from the configuration descriptor */
|
|
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
|
|
DComp_NextStillImageInterface) != DESCRIPTOR_SEARCH_COMP_Found)
|
|
{
|
|
/* Descriptor not found, error out */
|
|
return NoInterfaceFound;
|
|
}
|
|
|
|
/* Get the IN and OUT data and event endpoints for the Still Image interface */
|
|
while (FoundEndpoints != ((1 << SIMAGE_EVENTS_PIPE) | (1 << SIMAGE_DATA_IN_PIPE) | (1 << SIMAGE_DATA_OUT_PIPE)))
|
|
{
|
|
/* Fetch the next endpoint from the current Still Image interface */
|
|
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
|
|
DComp_NextStillImageInterfaceDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
|
|
{
|
|
/* Descriptor not found, error out */
|
|
return NoEndpointFound;
|
|
}
|
|
|
|
USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);
|
|
|
|
/* Check if the found endpoint is a interrupt or bulk type descriptor */
|
|
if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
|
|
{
|
|
/* If the endpoint is a IN type interrupt endpoint */
|
|
if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
|
|
{
|
|
/* Configure the events pipe */
|
|
Pipe_ConfigurePipe(SIMAGE_EVENTS_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
|
|
EndpointData->EndpointAddress, EndpointData->EndpointSize,
|
|
PIPE_BANK_DOUBLE);
|
|
|
|
Pipe_SetInterruptPeriod(EndpointData->PollingIntervalMS);
|
|
|
|
/* Set the flag indicating that the events pipe has been found */
|
|
FoundEndpoints |= (1 << SIMAGE_EVENTS_PIPE);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Check if the endpoint is a bulk IN or bulk OUT endpoint */
|
|
if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
|
|
{
|
|
/* Configure the data IN pipe */
|
|
Pipe_ConfigurePipe(SIMAGE_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN,
|
|
EndpointData->EndpointAddress, EndpointData->EndpointSize,
|
|
PIPE_BANK_DOUBLE);
|
|
|
|
/* Set the flag indicating that the data IN pipe has been found */
|
|
FoundEndpoints |= (1 << SIMAGE_DATA_IN_PIPE);
|
|
}
|
|
else
|
|
{
|
|
/* Configure the data OUT pipe */
|
|
Pipe_ConfigurePipe(SIMAGE_DATA_OUT_PIPE, EP_TYPE_BULK, PIPE_TOKEN_OUT,
|
|
EndpointData->EndpointAddress, EndpointData->EndpointSize,
|
|
PIPE_BANK_DOUBLE);
|
|
|
|
/* Set the flag indicating that the data OUT pipe has been found */
|
|
FoundEndpoints |= (1 << SIMAGE_DATA_OUT_PIPE);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Valid data found, return success */
|
|
return SuccessfulConfigRead;
|
|
}
|
|
|
|
/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
|
|
* configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
|
|
* descriptor processing if an incompatible descriptor configuration is found.
|
|
*
|
|
* This comparator searches for the next Interface descriptor of the correct Still Image Class, Subclass and Protocol values.
|
|
*
|
|
* \return A value from the DSEARCH_Return_ErrorCodes_t enum
|
|
*/
|
|
uint8_t DComp_NextStillImageInterface(void* CurrentDescriptor)
|
|
{
|
|
if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
|
|
{
|
|
/* Check the descriptor class and protocol, break out if correct class/protocol interface found */
|
|
if ((DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Class == SIMAGE_CLASS) &&
|
|
(DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).SubClass == SIMAGE_SUBCLASS) &&
|
|
(DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Protocol == SIMAGE_PROTOCOL))
|
|
{
|
|
return DESCRIPTOR_SEARCH_Found;
|
|
}
|
|
}
|
|
|
|
return DESCRIPTOR_SEARCH_NotFound;
|
|
}
|
|
|
|
/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
|
|
* configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
|
|
* descriptor processing if an incompatible descriptor configuration is found.
|
|
*
|
|
* This comparator searches for the next Interrupt or Bulk Endpoint descriptor of the current SI interface, aborting the
|
|
* search if another interface descriptor is found before the next endpoint.
|
|
*
|
|
* \return A value from the DSEARCH_Return_ErrorCodes_t enum
|
|
*/
|
|
uint8_t DComp_NextStillImageInterfaceDataEndpoint(void* CurrentDescriptor)
|
|
{
|
|
if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
|
|
{
|
|
uint8_t EndpointType = (DESCRIPTOR_CAST(CurrentDescriptor,
|
|
USB_Descriptor_Endpoint_t).Attributes & EP_TYPE_MASK);
|
|
|
|
if ((EndpointType == EP_TYPE_BULK) || (EndpointType == EP_TYPE_INTERRUPT))
|
|
return DESCRIPTOR_SEARCH_Found;
|
|
}
|
|
else if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
|
|
{
|
|
return DESCRIPTOR_SEARCH_Fail;
|
|
}
|
|
|
|
return DESCRIPTOR_SEARCH_NotFound;
|
|
}
|