X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/158afe910947739b1df00000628c1e758bdf0812..77a9df36a77d2523dd2bc24fa17f9f04c6c175c5:/Demos/Host/LowLevel/MIDIHost/ConfigDescriptor.c?ds=inline diff --git a/Demos/Host/LowLevel/MIDIHost/ConfigDescriptor.c b/Demos/Host/LowLevel/MIDIHost/ConfigDescriptor.c index 3ede45778..1a98b8249 100644 --- a/Demos/Host/LowLevel/MIDIHost/ConfigDescriptor.c +++ b/Demos/Host/LowLevel/MIDIHost/ConfigDescriptor.c @@ -1,21 +1,21 @@ /* LUFA Library - Copyright (C) Dean Camera, 2010. - + Copyright (C) Dean Camera, 2011. + dean [at] fourwalledcubicle [dot] com - www.fourwalledcubicle.com + www.lufa-lib.org */ /* - Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com) + Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com) - Permission to use, copy, modify, distribute, and sell this + 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 + 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 + 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 @@ -34,7 +34,7 @@ * 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 @@ -50,9 +50,10 @@ uint8_t ProcessConfigurationDescriptor(void) uint8_t ConfigDescriptorData[512]; void* CurrConfigLocation = ConfigDescriptorData; uint16_t CurrConfigBytesRem; - - USB_Descriptor_Endpoint_t* DataINEndpoint = NULL; - USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL; + + USB_Descriptor_Interface_t* MIDIInterface = NULL; + USB_Descriptor_Endpoint_t* DataINEndpoint = 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))) @@ -66,25 +67,14 @@ uint8_t ProcessConfigurationDescriptor(void) default: return ControlError; } - - /* Get the first MIDI interface from the configuration descriptor */ - if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, - DComp_NextMIDIStreamingInterface) != DESCRIPTOR_SEARCH_COMP_Found) - { - /* Descriptor not found, error out */ - return NoCompatibleInterfaceFound; - } while (!(DataINEndpoint) || !(DataOUTEndpoint)) { - /* Get the next MIDI interface's data endpoint descriptor */ - if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + /* See if we've found a likely compatible interface, and if there is an endpoint within that interface */ + if (!(MIDIInterface) || + USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, DComp_NextMIDIStreamingDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found) { - /* Clear any found endpoints */ - DataINEndpoint = NULL; - DataOUTEndpoint = NULL; - /* Get the next Mass Storage interface from the configuration descriptor */ if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, DComp_NextMIDIStreamingInterface) != DESCRIPTOR_SEARCH_COMP_Found) @@ -92,18 +82,28 @@ uint8_t ProcessConfigurationDescriptor(void) /* Descriptor not found, error out */ return NoCompatibleInterfaceFound; } + + /* Save the interface in case we need to refer back to it later */ + MIDIInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t); + + /* Clear any found endpoints */ + DataINEndpoint = NULL; + DataOUTEndpoint = NULL; + + /* 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); /* If the endpoint is a IN type endpoint */ if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN) - DataINEndpoint = EndpointData; + DataINEndpoint = EndpointData; else DataOUTEndpoint = EndpointData; } - + /* Configure the MIDI data IN pipe */ Pipe_ConfigurePipe(MIDI_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN, DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, PIPE_BANK_SINGLE); @@ -126,17 +126,21 @@ uint8_t ProcessConfigurationDescriptor(void) */ uint8_t DComp_NextMIDIStreamingInterface(void* CurrentDescriptor) { - if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface) + 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); + /* Check the MIDI descriptor class, subclass and protocol, break out if correct data interface found */ - if ((DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Class == MIDI_STREAMING_CLASS) && - (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).SubClass == MIDI_STREAMING_SUBCLASS) && - (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Protocol == MIDI_STREAMING_PROTOCOL)) + if ((Interface->Class == AUDIO_CSCP_AudioClass) && + (Interface->SubClass == AUDIO_CSCP_MIDIStreamingSubclass) && + (Interface->Protocol == AUDIO_CSCP_StreamingProtocol)) { return DESCRIPTOR_SEARCH_Found; } } - + return DESCRIPTOR_SEARCH_NotFound; } @@ -151,19 +155,21 @@ uint8_t DComp_NextMIDIStreamingInterface(void* CurrentDescriptor) */ uint8_t DComp_NextMIDIStreamingDataEndpoint(void* CurrentDescriptor) { - if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint) + USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t); + + if (Header->Type == DTYPE_Endpoint) { - uint8_t EndpointType = (DESCRIPTOR_CAST(CurrentDescriptor, - USB_Descriptor_Endpoint_t).Attributes & EP_TYPE_MASK); - + USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t); + /* Check the endpoint type, break out if correct BULK type endpoint found */ - if (EndpointType == EP_TYPE_BULK) + if ((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_BULK) return DESCRIPTOR_SEARCH_Found; } - else if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface) + else if (Header->Type == DTYPE_Interface) { return DESCRIPTOR_SEARCH_Fail; } return DESCRIPTOR_SEARCH_NotFound; } +