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/*
LUFA Library
Copyright (C) Dean Camera, 2010.
dean [at] fourwalledcubicle [dot] com
www.fourwalledcubicle.com
*/
/*
Copyright 2010 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 BT interface descriptor containing bulk IN and OUT data endpoints.
*
* \return An error code from the \ref Bluetooth_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;
}
/* The bluetooth USB transport addendum mandates that the data (not streaming voice) endpoints
be in the first interface descriptor (interface 0) */
USB_GetNextDescriptorOfType(&CurrConfigBytesRem, &CurrConfigLocation, DTYPE_Interface);
/* Ensure that an interface was found, and the end of the descriptor was not reached */
if (!(CurrConfigBytesRem))
return NoBTInterfaceFound;
/* Get the data IN, data OUT and event notification endpoints for the bluetooth interface */
while (FoundEndpoints != ((1 << BLUETOOTH_DATA_IN_PIPE) | (1 << BLUETOOTH_DATA_OUT_PIPE) |
(1 << BLUETOOTH_EVENTS_PIPE)))
{
/* Fetch the next endpoint from the current bluetooth interface */
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
DComp_NextInterfaceBluetoothDataEndpoint))
{
/* Descriptor not found, error out */
return NoEndpointFound;
}
USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);
/* Check if the endpoint is a bulk or interrupt type endpoint */
if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
{
if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
{
/* Configure the events IN pipe */
Pipe_ConfigurePipe(BLUETOOTH_EVENTS_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
EndpointData->EndpointAddress, EndpointData->EndpointSize,
PIPE_BANK_SINGLE);
Pipe_SetInterruptPeriod(EndpointData->PollingIntervalMS);
/* Set the flag indicating that the events notification pipe has been found */
FoundEndpoints |= (1 << BLUETOOTH_EVENTS_PIPE);
}
}
else
{
if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
{
/* Configure the data IN pipe */
Pipe_ConfigurePipe(BLUETOOTH_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN,
EndpointData->EndpointAddress, EndpointData->EndpointSize,
PIPE_BANK_SINGLE);
/* Set the flag indicating that the data IN pipe has been found */
FoundEndpoints |= (1 << BLUETOOTH_DATA_IN_PIPE);
}
else
{
/* Configure the data OUT pipe */
Pipe_ConfigurePipe(BLUETOOTH_DATA_OUT_PIPE, EP_TYPE_BULK, PIPE_TOKEN_OUT,
EndpointData->EndpointAddress, EndpointData->EndpointSize,
PIPE_BANK_SINGLE);
/* Set the flag indicating that the data OUT pipe has been found */
FoundEndpoints |= (1 << BLUETOOTH_DATA_OUT_PIPE);
}
}
}
/* Valid data found, return success */
return SuccessfulConfigRead;
}
uint8_t DComp_NextInterfaceBluetoothDataEndpoint(void* CurrentDescriptor)
{
/* PURPOSE: Find next interface endpoint descriptor before next interface descriptor */
if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
return DESCRIPTOR_SEARCH_Found;
else if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
return DESCRIPTOR_SEARCH_Fail;
return DESCRIPTOR_SEARCH_NotFound;
}
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