Added new GenericHIDHost demo.

Corrections to the KeyboardHost and MouseHost demos' pipe handling to freeze and unfreeze the data pipes at the point of use.

Demos/Host/GenericHIDHost/ConfigDescriptor.c

+/*
+             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 GenericHIDHost_GetConfigDescriptorDataCodes_t enum.
+ */
+uint8_t ProcessConfigurationDescriptor(void)
+{
+	uint8_t* ConfigDescriptorData;
+	uint16_t ConfigDescriptorSize;
+	
+	uint8_t  FoundEndpoints = 0;
+	
+	/* Get Configuration Descriptor size from the device */
+	if (USB_Host_GetDeviceConfigDescriptor(&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_Host_GetDeviceConfigDescriptor(&ConfigDescriptorSize, ConfigDescriptorData);
+	
+	/* Validate returned data - ensure first entry is a configuration header descriptor */
+	if (DESCRIPTOR_TYPE(ConfigDescriptorData) != DTYPE_Configuration)
+	  return InvalidConfigDataReturned;
+	
+	/* Get the HID interface from the configuration descriptor */
+	if (USB_Host_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData, NextHIDInterface))
+	{
+		/* Descriptor not found, error out */
+		return NoHIDInterfaceFound;
+	}
+
+	while (FoundEndpoints != ((1 << HID_DATA_IN_PIPE) | (1 << HID_DATA_OUT_PIPE)))
+	{
+		/* Get the next HID interface's data endpoint descriptor */
+		if (USB_Host_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
+										   NextInterfaceHIDDataEndpoint))
+		{
+			/* Not all HID devices have an OUT endpoint - if we've reached the end of the HID descriptor
+			 * but only found the mandatory IN endpoint, it's safe to continue with the device enumeration */
+			if (FoundEndpoints == (1 << HID_DATA_IN_PIPE))
+			  break;
+				
+			/* 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);
+
+		/* If the endpoint is a IN type endpoint */
+		if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
+		{
+			/* Configure the HID data IN pipe */
+			Pipe_ConfigurePipe(HID_DATA_IN_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
+							   EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
+
+			Pipe_SetInfiniteINRequests();
+
+			#if defined(INTERRUPT_DATA_PIPE)
+			Pipe_SetInterruptPeriod(EndpointData->PollingIntervalMS);
+
+			/* Enable the pipe IN interrupt for the data pipe */
+			USB_INT_Enable(PIPE_INT_IN);	
+			#endif
+			
+			FoundEndpoints |= (1 << HID_DATA_IN_PIPE);
+		}
+		else
+		{
+			/* Configure the HID data OUT pipe */
+			Pipe_ConfigurePipe(HID_DATA_OUT_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_OUT,
+							   EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
+			
+			FoundEndpoints |= (1 << HID_DATA_OUT_PIPE);		
+		}
+	}
+			
+	/* 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 HID Class value.
+ *
+ *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
+ */
+DESCRIPTOR_COMPARATOR(NextHIDInterface)
+{
+	/* 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 == HID_CLASS)
+		{
+			/* 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
+ */
+DESCRIPTOR_COMPARATOR(NextInterfaceHIDDataEndpoint)
+{
+	/* Determine the type of the current descriptor */
+	if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
+	{
+		/* 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;
+}

Demos/Host/GenericHIDHost/ConfigDescriptor.h

+/*
+             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
+ *
+ *  Header file for ConfigDescriptor.c.
+ */
+
+#ifndef _CONFIGDESCRIPTOR_H_
+#define _CONFIGDESCRIPTOR_H_
+
+	/* Includes: */
+		#include <LUFA/Drivers/USB/USB.h>                        // USB Functionality
+		#include <LUFA/Drivers/USB/Class/ConfigDescriptor.h>     // Configuration Descriptor Parser
+		
+		#include "GenericHIDHost.h"
+		
+	/* Macros: */
+		/** Interface Class value for the Human Interface Device class */
+		#define HID_CLASS                 0x03
+
+		/** Maximum size of a device configuration descriptor which can be processed by the host, in bytes */
+		#define MAX_CONFIG_DESCRIPTOR_SIZE  512
+	
+	/* Enums: */
+		/** Enum for the possible return codes of the ProcessConfigurationDescriptor() function. */
+		enum GenericHIDHost_GetConfigDescriptorDataCodes_t
+		{
+			SuccessfulConfigRead            = 0, /**< Configuration Descriptor was processed successfully */
+			ControlError                    = 1, /**< A control request to the device failed to complete successfully */
+			DescriptorTooLarge              = 2, /**< The device's Configuration Descriptor is too large to process */
+			InvalidConfigDataReturned       = 3, /**< The device returned an invalid Configuration Descriptor */
+			NoHIDInterfaceFound             = 4, /**< A compatible HID interface was not found in the device's Configuration Descriptor */
+			NoEndpointFound                 = 5, /**< A compatible HID IN endpoint was not found in the device's HID interface */
+		};	
+
+	/* Configuration Descriptor Comparison Functions: */
+		DESCRIPTOR_COMPARATOR(NextHIDInterface);
+		DESCRIPTOR_COMPARATOR(NextInterfaceHIDDataEndpoint);
+
+	/* Function Prototypes: */
+		uint8_t ProcessConfigurationDescriptor(void);	
+
+#endif

Demos/Host/GenericHIDHost/GenericHIDHost.aps

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Demos/Host/GenericHIDHost/GenericHIDHost.c

+/*
+             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
+ *
+ *  Main source file for the GenericHIDHost demo. This file contains the main tasks of
+ *  the demo and is responsible for the initial application hardware configuration.
+ */
+ 
+#include "GenericHIDHost.h"
+
+/* Project Tags, for reading out using the ButtLoad project */
+BUTTLOADTAG(ProjName,    "LUFA GenHid Host App");
+BUTTLOADTAG(BuildTime,   __TIME__);
+BUTTLOADTAG(BuildDate,   __DATE__);
+BUTTLOADTAG(LUFAVersion, "LUFA V" LUFA_VERSION_STRING);
+
+/* Scheduler Task List */
+TASK_LIST
+{
+	{ Task: USB_USBTask          , TaskStatus: TASK_STOP },
+	{ Task: USB_HID_Host         , TaskStatus: TASK_STOP },
+};
+
+
+/** Main program entry point. This routine configures the hardware required by the application, then
+ *  starts the scheduler to run the application tasks.
+ */
+int main(void)
+{
+	/* Disable watchdog if enabled by bootloader/fuses */
+	MCUSR &= ~(1 << WDRF);
+	wdt_disable();
+
+	/* Disable clock division */
+	clock_prescale_set(clock_div_1);
+	
+	/* Hardware Initialization */
+	SerialStream_Init(9600, false);
+	LEDs_Init();
+	
+	/* Indicate USB not ready */
+	UpdateStatus(Status_USBNotReady);
+	
+	/* Initialize Scheduler so that it can be used */
+	Scheduler_Init();
+
+	/* Initialize USB Subsystem */
+	USB_Init();
+
+	/* Startup message */
+	puts_P(PSTR(ESC_RESET ESC_BG_WHITE ESC_INVERSE_ON ESC_ERASE_DISPLAY
+	       "Generic HID Host Demo running.\r\n" ESC_INVERSE_OFF));
+		   
+	/* Scheduling - routine never returns, so put this last in the main function */
+	Scheduler_Start();
+}
+
+/** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
+ *  starts the library USB task to begin the enumeration and USB management process.
+ */
+EVENT_HANDLER(USB_DeviceAttached)
+{
+	puts_P(PSTR("Device Attached.\r\n"));
+	UpdateStatus(Status_USBEnumerating);
+
+	/* Start USB management task to enumerate the device */
+	Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
+}
+
+/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
+ *  stops the library USB task management process.
+ */
+EVENT_HANDLER(USB_DeviceUnattached)
+{
+	/* Stop HID and USB management task */
+	Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
+	Scheduler_SetTaskMode(USB_HID_Host, TASK_STOP);
+
+	puts_P(PSTR("Device Unattached.\r\n"));
+	UpdateStatus(Status_USBNotReady);
+}
+
+/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
+ *  enumerated by the host and is now ready to be used by the application.
+ */
+EVENT_HANDLER(USB_DeviceEnumerationComplete)
+{
+	/* Start HID Host task */
+	Scheduler_SetTaskMode(USB_HID_Host, TASK_RUN);
+
+	/* Indicate device enumeration complete */
+	UpdateStatus(Status_USBReady);
+}
+
+/** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
+EVENT_HANDLER(USB_HostError)
+{
+	USB_ShutDown();
+
+	puts_P(PSTR(ESC_BG_RED "Host Mode Error\r\n"));
+	printf_P(PSTR(" -- Error Code %d\r\n"), ErrorCode);
+
+	UpdateStatus(Status_HardwareError);
+	for(;;);
+}
+
+/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occured while
+ *  enumerating an attached USB device.
+ */
+EVENT_HANDLER(USB_DeviceEnumerationFailed)
+{
+	puts_P(PSTR(ESC_BG_RED "Dev Enum Error\r\n"));
+	printf_P(PSTR(" -- Error Code %d\r\n"), ErrorCode);
+	printf_P(PSTR(" -- Sub Error Code %d\r\n"), SubErrorCode);
+	printf_P(PSTR(" -- In State %d\r\n"), USB_HostState);
+
+	UpdateStatus(Status_EnumerationError);
+}
+
+/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
+ *  log to a serial port, or anything else that is suitable for status updates.
+ *
+ *  \param CurrentStatus  Current status of the system, from the GenericHIDHost_StatusCodes_t enum
+ */
+void UpdateStatus(uint8_t CurrentStatus)
+{
+	uint8_t LEDMask = LEDS_NO_LEDS;
+	
+	/* Set the LED mask to the appropriate LED mask based on the given status code */
+	switch (CurrentStatus)
+	{
+		case Status_USBNotReady:
+			LEDMask = (LEDS_LED1);
+			break;
+		case Status_USBEnumerating:
+			LEDMask = (LEDS_LED1 | LEDS_LED2);
+			break;
+		case Status_USBReady:
+			LEDMask = (LEDS_LED2);
+			break;
+		case Status_EnumerationError:
+		case Status_HardwareError:
+			LEDMask = (LEDS_LED1 | LEDS_LED3);
+			break;
+	}
+	
+	/* Set the board LEDs to the new LED mask */
+	LEDs_SetAllLEDs(LEDMask);
+}
+
+/** Reads in and processes the next report from the attached device, displaying the report
+ *  contents on the board LEDs and via the serial port.
+ */
+void ReadNextReport(void)
+{
+	/* Select and unfreeze HID data IN pipe */
+	Pipe_SelectPipe(HID_DATA_IN_PIPE);
+	Pipe_Unfreeze();
+
+	/* Ensure pipe contains data and is ready to be read before continuing */
+	if (!(Pipe_ReadWriteAllowed()))
+	{
+		#if !defined(INTERRUPT_DATA_PIPE)
+		/* Refreeze HID data IN pipe */
+		Pipe_Freeze();
+		#endif
+		
+		return;
+	}
+	
+	uint8_t ReportINData[Pipe_BytesInPipe()];
+
+	/* Read in HID report data */
+	Pipe_Read_Stream_LE(&ReportINData, sizeof(ReportINData));				
+		
+	/* Clear the IN endpoint, ready for next data packet */
+	Pipe_ClearCurrentBank();
+	
+	/* Print report data through the serial port */
+	for (uint16_t CurrByte = 0; CurrByte < sizeof(ReportINData); CurrByte++)
+	  printf_P(PSTR("0x%02X "), ReportINData[CurrByte]);
+	
+	puts_P(PSTR("\r\n"));
+	
+	#if !defined(INTERRUPT_DATA_PIPE)
+	/* Refreeze HID data IN pipe */
+	Pipe_Freeze();
+	#endif
+}
+
+/** Writes a report to the attached device.
+ *
+ *  \param ReportOUTData  Buffer containing the report to send to the device
+ *  \param ReportLength  Length of the report to send
+ */
+void WriteNextReport(uint8_t ReportOUTData, uint16_t ReportLength)
+{
+	/* Select and unfreeze HID data OUT pipe */
+	Pipe_SelectPipe(HID_DATA_IN_PIPE);
+	
+	/* Not all HID devices have an OUT endpoint (some require OUT reports to be sent over the
+	 * control endpoint instead) - check to see if the OUT endpoint has been initialized */
+	if (Pipe_IsConfigured())
+	{
+		Pipe_Unfreeze();
+
+		/* Ensure pipe is ready to be written to before continuing */
+		if (!(Pipe_ReadWriteAllowed()))
+		{
+			/* Refreeze the data OUT pipe */
+			Pipe_Freeze();
+			
+			return;
+		}
+
+		/* Read in HID report data */
+		Pipe_Write_Stream_LE(&ReportOUTData, ReportLength);				
+			
+		/* Clear the OUT endpoint, send last data packet */
+		Pipe_ClearCurrentBank();
+
+		/* Refreeze the data OUT pipe */
+		Pipe_Freeze();
+	}
+	else
+	{
+		/* Class specific request to send a HID report to the device */
+		USB_HostRequest = (USB_Host_Request_Header_t)
+			{
+				bmRequestType: (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE),
+				bRequest:      REQ_SetReport,
+				wValue:        0,
+				wIndex:        0,
+				wLength:       ReportLength,
+			};
+
+		/* Send the request to the device */
+		USB_Host_SendControlRequest(ReportOUTData);
+	}
+}
+
+/** Task to set the configuration of the attached device after it has been enumerated, and to read and process
+ *  HID reports from the device and to send reports if desired.
+ */
+TASK(USB_HID_Host)
+{
+	uint8_t ErrorCode;
+
+	/* Switch to determine what user-application handled host state the host state machine is in */
+	switch (USB_HostState)
+	{
+		case HOST_STATE_Addressed:
+			/* Standard request to set the device configuration to configuration 1 */
+			USB_HostRequest = (USB_Host_Request_Header_t)
+				{
+					bmRequestType: (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_DEVICE),
+					bRequest:      REQ_SetConfiguration,
+					wValue:        1,
+					wIndex:        0,
+					wLength:       0,
+				};
+
+			/* Send the request, display error and wait for device detatch if request fails */
+			if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful)
+			{
+				puts_P(PSTR("Control Error (Set Configuration).\r\n"));
+				printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
+
+				/* Indicate error status */
+				UpdateStatus(Status_EnumerationError);
+				
+				/* Wait until USB device disconnected */
+				while (USB_IsConnected);
+				break;
+			}
+			
+			USB_HostState = HOST_STATE_Configured;
+			break;
+		case HOST_STATE_Configured:
+			puts_P(PSTR("Getting Config Data.\r\n"));
+		
+			/* Get and process the configuration descriptor data */
+			if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
+			{
+				if (ErrorCode == ControlError)
+				  puts_P(PSTR("Control Error (Get Configuration).\r\n"));
+				else
+				  puts_P(PSTR("Invalid Device.\r\n"));
+
+				printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);
+				
+				/* Indicate error status */
+				UpdateStatus(Status_EnumerationError);
+
+				/* Wait until USB device disconnected */
+				while (USB_IsConnected);
+				break;
+			}
+		
+			#if defined(INTERRUPT_DATA_PIPE)					
+			/* Select and unfreeze HID data IN pipe */
+			Pipe_SelectPipe(HID_DATA_IN_PIPE);
+			Pipe_Unfreeze();
+			#endif
+
+			puts_P(PSTR("HID Device Enumerated.\r\n"));
+					
+			USB_HostState = HOST_STATE_Ready;
+			break;
+		#if !defined(INTERRUPT_DATA_PIPE)
+		case HOST_STATE_Ready:
+			ReadNextReport();
+
+			break;
+		#endif
+	}
+}
+
+#if defined(INTERRUPT_DATA_PIPE)
+/** Interrupt handler for the Endpoint/Pipe interrupt vector. This interrupt fires each time an enabled
+ *  pipe interrupt occurs on a pipe which has had that interrupt enabled.
+ */
+ISR(ENDPOINT_PIPE_vect, ISR_BLOCK)
+{
+	/* Check to see if the HID data IN pipe has caused the interrupt */
+	if (Pipe_HasPipeInterrupted(HID_DATA_IN_PIPE))
+	{
+		/* Clear the pipe interrupt, and select the data IN pipe */
+		Pipe_ClearPipeInterrupt(HID_DATA_IN_PIPE);
+		Pipe_SelectPipe(HID_DATA_IN_PIPE);