X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/f10126a95e528a04b4ec6be1d0fc30be4fbb7e98..0ec2b55a7c9bc616ad8c78e75410dd27bae1b8b6:/Demos/Host/LowLevel/AudioOutputHost/ConfigDescriptor.c?ds=inline diff --git a/Demos/Host/LowLevel/AudioOutputHost/ConfigDescriptor.c b/Demos/Host/LowLevel/AudioOutputHost/ConfigDescriptor.c index 46a0e331f..ac1c23405 100644 --- a/Demos/Host/LowLevel/AudioOutputHost/ConfigDescriptor.c +++ b/Demos/Host/LowLevel/AudioOutputHost/ConfigDescriptor.c @@ -1,220 +1,220 @@ -/* - LUFA Library - Copyright (C) Dean Camera, 2011. - - dean [at] fourwalledcubicle [dot] com - www.lufa-lib.org -*/ - -/* - Copyright 2011 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" - -/** Index of the currently used Audio Streaming Interface within the device. */ -uint8_t StreamingInterfaceIndex = 0; - -/** Alternative Setting of the currently used Audio Streaming Interface within the device. */ -uint8_t StreamingInterfaceAltSetting = 0; - -/** Address of the streaming audio endpoint currently in use within the device. */ -uint8_t StreamingEndpointAddress = 0; - - -/** 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 Streaming Audio interface descriptor containing a valid Isochronous audio endpoint. - * - * \return An error code from the \ref AudioHost_GetConfigDescriptorDataCodes_t enum. - */ -uint8_t ProcessConfigurationDescriptor(void) -{ - uint8_t ConfigDescriptorData[512]; - void* CurrConfigLocation = ConfigDescriptorData; - uint16_t CurrConfigBytesRem; - - USB_Descriptor_Interface_t* AudioControlInterface = NULL; - USB_Descriptor_Interface_t* AudioStreamingInterface = NULL; - USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL; - - /* 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; - } - - while (!(DataOUTEndpoint)) - { - /* See if we've found a likely compatible interface, and if there is an endpoint within that interface */ - if (!(AudioControlInterface) || - USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, - DComp_NextAudioInterfaceDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found) - { - /* Check if we haven't found an Audio Control interface yet, or if we have run out of related Audio Streaming interfaces */ - if (!(AudioControlInterface) || - USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, - DComp_NextAudioStreamInterface) != DESCRIPTOR_SEARCH_COMP_Found) - { - /* Find a new Audio Control interface if the current one doesn't contain a compatible streaming interface */ - if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, - DComp_NextAudioControlInterface) != DESCRIPTOR_SEARCH_COMP_Found) - { - /* Descriptor not found, error out */ - return NoCompatibleInterfaceFound; - } - - /* Save the interface in case we need to refer back to it later */ - AudioControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t); - - /* Find the next Audio Streaming interface within that Audio Control interface */ - if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, - DComp_NextAudioStreamInterface) != DESCRIPTOR_SEARCH_COMP_Found) - { - /* Descriptor not found, error out */ - return NoCompatibleInterfaceFound; - } - } - - /* Save the interface in case we need to refer back to it later */ - AudioStreamingInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t); - - /* Skip the remainder of the loop as we have not found an endpoint yet */ - continue; - } - - /* Retrieve the endpoint address from the endpoint descriptor */ - USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t); - - /* Save the endpoint if it is an OUT type endpoint */ - if (!(EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)) - DataOUTEndpoint = EndpointData; - } - - StreamingInterfaceIndex = AudioStreamingInterface->InterfaceNumber; - StreamingInterfaceAltSetting = AudioStreamingInterface->AlternateSetting; - StreamingEndpointAddress = DataOUTEndpoint->EndpointAddress; - - /* Configure the Audio data OUT pipe */ - Pipe_ConfigurePipe(AUDIO_DATA_OUT_PIPE, EP_TYPE_ISOCHRONOUS, PIPE_TOKEN_OUT, - DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, PIPE_BANK_DOUBLE); - - /* 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 Audio Control Class, Subclass and Protocol values. - * - * \return A value from the DSEARCH_Return_ErrorCodes_t enum - */ -uint8_t DComp_NextAudioControlInterface(void* CurrentDescriptor) -{ - USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t); - - if (Header->Type == DTYPE_Interface) - { - USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t); - - if ((Interface->Class == AUDIO_CSCP_AudioClass) && - (Interface->SubClass == AUDIO_CSCP_ControlSubclass) && - (Interface->Protocol == AUDIO_CSCP_ControlProtocol)) - { - 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 Interface descriptor of the correct Audio Streaming Class, Subclass and Protocol values. - * - * \return A value from the DSEARCH_Return_ErrorCodes_t enum - */ -uint8_t DComp_NextAudioStreamInterface(void* CurrentDescriptor) -{ - USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t); - - if (Header->Type == DTYPE_Interface) - { - USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t); - - if ((Interface->Class == AUDIO_CSCP_AudioClass) && - (Interface->SubClass == AUDIO_CSCP_AudioStreamingSubclass) && - (Interface->Protocol == AUDIO_CSCP_StreamingProtocol)) - { - 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 Isochronous Endpoint descriptor within the current 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_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor) -{ - USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t); - - if (Header->Type == DTYPE_Endpoint) - { - USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t); - - if ((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_ISOCHRONOUS) - return DESCRIPTOR_SEARCH_Found; - } - else if (Header->Type == DTYPE_Interface) - { - return DESCRIPTOR_SEARCH_Fail; - } - - return DESCRIPTOR_SEARCH_NotFound; -} +/* + LUFA Library + Copyright (C) Dean Camera, 2011. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2011 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" + +/** Index of the currently used Audio Streaming Interface within the device. */ +uint8_t StreamingInterfaceIndex = 0; + +/** Alternative Setting of the currently used Audio Streaming Interface within the device. */ +uint8_t StreamingInterfaceAltSetting = 0; + +/** Address of the streaming audio endpoint currently in use within the device. */ +uint8_t StreamingEndpointAddress = 0; + + +/** 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 Streaming Audio interface descriptor containing a valid Isochronous audio endpoint. + * + * \return An error code from the \ref AudioHost_GetConfigDescriptorDataCodes_t enum. + */ +uint8_t ProcessConfigurationDescriptor(void) +{ + uint8_t ConfigDescriptorData[512]; + void* CurrConfigLocation = ConfigDescriptorData; + uint16_t CurrConfigBytesRem; + + USB_Descriptor_Interface_t* AudioControlInterface = NULL; + USB_Descriptor_Interface_t* AudioStreamingInterface = NULL; + USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL; + + /* 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; + } + + while (!(DataOUTEndpoint)) + { + /* See if we've found a likely compatible interface, and if there is an endpoint within that interface */ + if (!(AudioControlInterface) || + USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + DComp_NextAudioInterfaceDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found) + { + /* Check if we haven't found an Audio Control interface yet, or if we have run out of related Audio Streaming interfaces */ + if (!(AudioControlInterface) || + USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + DComp_NextAudioStreamInterface) != DESCRIPTOR_SEARCH_COMP_Found) + { + /* Find a new Audio Control interface if the current one doesn't contain a compatible streaming interface */ + if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + DComp_NextAudioControlInterface) != DESCRIPTOR_SEARCH_COMP_Found) + { + /* Descriptor not found, error out */ + return NoCompatibleInterfaceFound; + } + + /* Save the interface in case we need to refer back to it later */ + AudioControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t); + + /* Find the next Audio Streaming interface within that Audio Control interface */ + if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + DComp_NextAudioStreamInterface) != DESCRIPTOR_SEARCH_COMP_Found) + { + /* Descriptor not found, error out */ + return NoCompatibleInterfaceFound; + } + } + + /* Save the interface in case we need to refer back to it later */ + AudioStreamingInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t); + + /* Skip the remainder of the loop as we have not found an endpoint yet */ + continue; + } + + /* Retrieve the endpoint address from the endpoint descriptor */ + USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t); + + /* Save the endpoint if it is an OUT type endpoint */ + if (!(EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)) + DataOUTEndpoint = EndpointData; + } + + StreamingInterfaceIndex = AudioStreamingInterface->InterfaceNumber; + StreamingInterfaceAltSetting = AudioStreamingInterface->AlternateSetting; + StreamingEndpointAddress = DataOUTEndpoint->EndpointAddress; + + /* Configure the Audio data OUT pipe */ + Pipe_ConfigurePipe(AUDIO_DATA_OUT_PIPE, EP_TYPE_ISOCHRONOUS, PIPE_TOKEN_OUT, + DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, PIPE_BANK_DOUBLE); + + /* 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 Audio Control Class, Subclass and Protocol values. + * + * \return A value from the DSEARCH_Return_ErrorCodes_t enum + */ +uint8_t DComp_NextAudioControlInterface(void* CurrentDescriptor) +{ + USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t); + + if (Header->Type == DTYPE_Interface) + { + USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t); + + if ((Interface->Class == AUDIO_CSCP_AudioClass) && + (Interface->SubClass == AUDIO_CSCP_ControlSubclass) && + (Interface->Protocol == AUDIO_CSCP_ControlProtocol)) + { + 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 Interface descriptor of the correct Audio Streaming Class, Subclass and Protocol values. + * + * \return A value from the DSEARCH_Return_ErrorCodes_t enum + */ +uint8_t DComp_NextAudioStreamInterface(void* CurrentDescriptor) +{ + USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t); + + if (Header->Type == DTYPE_Interface) + { + USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t); + + if ((Interface->Class == AUDIO_CSCP_AudioClass) && + (Interface->SubClass == AUDIO_CSCP_AudioStreamingSubclass) && + (Interface->Protocol == AUDIO_CSCP_StreamingProtocol)) + { + 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 Isochronous Endpoint descriptor within the current 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_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor) +{ + USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t); + + if (Header->Type == DTYPE_Endpoint) + { + USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t); + + if ((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_ISOCHRONOUS) + return DESCRIPTOR_SEARCH_Found; + } + else if (Header->Type == DTYPE_Interface) + { + return DESCRIPTOR_SEARCH_Fail; + } + + return DESCRIPTOR_SEARCH_NotFound; +}