X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/a3a04aa6719a891a1350179d5ac451c3e18c3bf2..eea687e6d9524e252d3ae50f06b33f4e753dcf2b:/Demos/Host/LowLevel/MouseHost/ConfigDescriptor.c diff --git a/Demos/Host/LowLevel/MouseHost/ConfigDescriptor.c b/Demos/Host/LowLevel/MouseHost/ConfigDescriptor.c index e0be70b1b..926642f02 100644 --- a/Demos/Host/LowLevel/MouseHost/ConfigDescriptor.c +++ b/Demos/Host/LowLevel/MouseHost/ConfigDescriptor.c @@ -1,153 +1,160 @@ -/* - 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, and distribute this software - and its documentation for any purpose and without fee is hereby - granted, 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 HID interface descriptor containing at least one Interrupt type IN endpoint. - * - * \return An error code from the MouseHost_GetConfigDescriptorDataCodes_t enum. - */ -uint8_t ProcessConfigurationDescriptor(void) -{ - uint8_t* ConfigDescriptorData; - uint16_t ConfigDescriptorSize; - - /* Get Configuration Descriptor size from the device */ - if (USB_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, NULL) != HOST_SENDCONTROL_Successful) - return ControlError; - - /* Ensure that the Configuration Descriptor isn't too large */ - if (ConfigDescriptorSize > MAX_CONFIG_DESCRIPTOR_SIZE) - return DescriptorTooLarge; - - /* Allocate enough memory for the entire config descriptor */ - ConfigDescriptorData = alloca(ConfigDescriptorSize); - - /* Retrieve the entire configuration descriptor into the allocated buffer */ - USB_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData); - - /* Validate returned data - ensure first entry is a configuration header descriptor */ - if (DESCRIPTOR_TYPE(ConfigDescriptorData) != DTYPE_Configuration) - return InvalidConfigDataReturned; - - /* Get the mouse interface from the configuration descriptor */ - if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData, - DComp_NextMouseInterface) != DESCRIPTOR_SEARCH_COMP_Found) - { - /* Descriptor not found, error out */ - return NoHIDInterfaceFound; - } - - /* Get the mouse interface's data endpoint descriptor */ - if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData, - DComp_NextInterfaceMouseDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found) - { - /* Descriptor not found, error out */ - return NoEndpointFound; - } - - /* Retrieve the endpoint address from the endpoint descriptor */ - USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(ConfigDescriptorData, USB_Descriptor_Endpoint_t); - - /* Configure the mouse data pipe */ - Pipe_ConfigurePipe(MOUSE_DATAPIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN, - EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE); - - /* 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 Mouse HID Class and Protocol values. - * - * \return A value from the DSEARCH_Return_ErrorCodes_t enum - */ -uint8_t DComp_NextMouseInterface(void* CurrentDescriptor) -{ - /* Determine if the current descriptor is an interface descriptor */ - if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface) - { - /* Check the HID descriptor class and protocol, break out if correct class/protocol interface found */ - if ((DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Class == MOUSE_CLASS) && - (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Protocol == MOUSE_PROTOCOL)) - { - /* Indicate that the descriptor being searched for has been found */ - return DESCRIPTOR_SEARCH_Found; - } - } - - /* Current descriptor does not match what this comparator is looking for */ - 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 IN Endpoint descriptor inside the current interface descriptor, - * aborting the search if another interface descriptor is found before the required endpoint. - * - * \return A value from the DSEARCH_Return_ErrorCodes_t enum - */ -uint8_t DComp_NextInterfaceMouseDataEndpoint(void* CurrentDescriptor) -{ - /* Determine the type of the current descriptor */ - if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint) - { - /* Check if the current Endpoint descriptor is of type IN */ - if (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Endpoint_t).EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN) - { - /* Indicate that the descriptor being searched for has been found */ - return DESCRIPTOR_SEARCH_Found; - } - } - else if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface) - { - /* Indicate that the search has failed prematurely and should be aborted */ - return DESCRIPTOR_SEARCH_Fail; - } - - /* Current descriptor does not match what this comparator is looking for */ - 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" + +/** 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 HID interface descriptor containing at least one Interrupt type IN endpoint. + * + * \return An error code from the \ref MouseHost_GetConfigDescriptorDataCodes_t enum. + */ +uint8_t ProcessConfigurationDescriptor(void) +{ + uint8_t ConfigDescriptorData[512]; + void* CurrConfigLocation = ConfigDescriptorData; + uint16_t CurrConfigBytesRem; + + USB_Descriptor_Interface_t* HIDInterface = NULL; + USB_Descriptor_Endpoint_t* DataINEndpoint = 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 (!(DataINEndpoint)) + { + /* See if we've found a likely compatible interface, and if there is an endpoint within that interface */ + if (!(HIDInterface) || + USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + DComp_NextMouseInterfaceDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found) + { + /* Get the next HID interface from the configuration descriptor */ + if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + DComp_NextMouseInterface) != DESCRIPTOR_SEARCH_COMP_Found) + { + /* Descriptor not found, error out */ + return NoCompatibleInterfaceFound; + } + + /* Save the interface in case we need to refer back to it later */ + HIDInterface = 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); + + /* If the endpoint is a IN type endpoint */ + if ((EndpointData->EndpointAddress & ENDPOINT_DIR_MASK) == ENDPOINT_DIR_IN) + DataINEndpoint = EndpointData; + } + + /* Configure the HID data IN pipe */ + Pipe_ConfigurePipe(MOUSE_DATA_IN_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN, + DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, PIPE_BANK_SINGLE); + Pipe_SetInterruptPeriod(DataINEndpoint->PollingIntervalMS); + + /* 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 Mouse HID Class and Protocol values. + * + * \return A value from the DSEARCH_Return_ErrorCodes_t enum + */ +uint8_t DComp_NextMouseInterface(void* CurrentDescriptor) +{ + USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t); + + /* Determine if the current descriptor is an interface descriptor */ + if (Header->Type == DTYPE_Interface) + { + USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t); + + /* Check the HID descriptor class and protocol, break out if correct class/protocol interface found */ + if ((Interface->Class == HID_CSCP_HIDClass) && + (Interface->Protocol == HID_CSCP_MouseBootProtocol)) + { + /* Indicate that the descriptor being searched for has been found */ + return DESCRIPTOR_SEARCH_Found; + } + } + + /* Current descriptor does not match what this comparator is looking for */ + 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 Endpoint descriptor inside the current interface descriptor, aborting the + * search if another interface descriptor is found before the required endpoint. + * + * \return A value from the DSEARCH_Return_ErrorCodes_t enum + */ +uint8_t DComp_NextMouseInterfaceDataEndpoint(void* CurrentDescriptor) +{ + USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t); + + /* Determine the type of the current descriptor */ + if (Header->Type == DTYPE_Endpoint) + return DESCRIPTOR_SEARCH_Found; + else if (Header->Type == DTYPE_Interface) + return DESCRIPTOR_SEARCH_Fail; + else + return DESCRIPTOR_SEARCH_NotFound; +} +