From 87b2572ae50d20f04dfa6bfbd9e0b8b20ee650e9 Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Wed, 4 Nov 2009 04:55:10 +0000 Subject: Added new JoystickHostWithParser demos to the library. Add some missing documentation to some of the library demos. --- .../JoystickHostWithParser/ConfigDescriptor.c | 166 +++++++++++++++++++++ 1 file changed, 166 insertions(+) create mode 100644 Demos/Host/LowLevel/JoystickHostWithParser/ConfigDescriptor.c (limited to 'Demos/Host/LowLevel/JoystickHostWithParser/ConfigDescriptor.c') diff --git a/Demos/Host/LowLevel/JoystickHostWithParser/ConfigDescriptor.c b/Demos/Host/LowLevel/JoystickHostWithParser/ConfigDescriptor.c new file mode 100644 index 000000000..77392dc93 --- /dev/null +++ b/Demos/Host/LowLevel/JoystickHostWithParser/ConfigDescriptor.c @@ -0,0 +1,166 @@ +/* + 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 and HID descriptor. + * + * \return An error code from the \ref JoystickHostWithParser_GetConfigDescriptorDataCodes_t enum. + */ +uint8_t ProcessConfigurationDescriptor(void) +{ + uint8_t ConfigDescriptorData[512]; + uint8_t* CurrConfigLocation = ConfigDescriptorData; + uint16_t CurrConfigBytesRem; + + /* Retrieve the entire configuration descriptor into the allocated buffer */ + switch (USB_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 joystick interface from the configuration descriptor */ + if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + DComp_NextJoystickInterface) != DESCRIPTOR_SEARCH_COMP_Found) + { + /* Descriptor not found, error out */ + return NoHIDInterfaceFound; + } + + /* Get the joystick interface's HID descriptor */ + if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + DComp_NextHID) != DESCRIPTOR_SEARCH_COMP_Found) + { + /* Descriptor not found, error out */ + return NoHIDDescriptorFound; + } + + /* Save the HID report size for later use */ + HIDReportSize = DESCRIPTOR_CAST(CurrConfigLocation, USB_Descriptor_HID_t).HIDReportLength; + + /* Get the joystick interface's data endpoint descriptor */ + if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation, + DComp_NextJoystickInterfaceDataEndpoint) != 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(CurrConfigLocation, USB_Descriptor_Endpoint_t); + + /* Configure the joystick data pipe */ + Pipe_ConfigurePipe(JOYSTICK_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 Joystick HID Class and Protocol values. + * + * \return A value from the \ref DSEARCH_Return_ErrorCodes_t enum + */ +uint8_t DComp_NextJoystickInterface(void* CurrentDescriptor) +{ + 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 == JOYSTICK_CLASS) && + (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Protocol == JOYSTICK_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 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 \ref DSEARCH_Return_ErrorCodes_t enum + */ +uint8_t DComp_NextJoystickInterfaceDataEndpoint(void* CurrentDescriptor) +{ + if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint) + { + if (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Endpoint_t).EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN) + return DESCRIPTOR_SEARCH_Found; + } + else if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface) + { + return DESCRIPTOR_SEARCH_Fail; + } + + 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 HID descriptor within the current HID interface descriptor. + * + * \return A value from the \ref DSEARCH_Return_ErrorCodes_t enum + */ +uint8_t DComp_NextHID(void* CurrentDescriptor) +{ + if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_HID) + return DESCRIPTOR_SEARCH_Found; + else + return DESCRIPTOR_SEARCH_NotFound; +} -- cgit v1.2.3