/*
LUFA Library
- Copyright (C) Dean Camera, 2010.
-
+ Copyright (C) Dean Camera, 2012.
+
dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
+ www.lufa-lib.org
*/
/*
- Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2012 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
* 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
uint8_t ConfigDescriptorData[512];
void* CurrConfigLocation = ConfigDescriptorData;
uint16_t CurrConfigBytesRem;
- uint8_t FoundEndpoints = 0;
+
+ USB_Descriptor_Interface_t* CDCControlInterface = NULL;
+ USB_Descriptor_Endpoint_t* DataINEndpoint = NULL;
+ USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL;
+ USB_Descriptor_Endpoint_t* NotificationEndpoint = NULL;
/* Retrieve the entire configuration descriptor into the allocated buffer */
switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
default:
return ControlError;
}
-
- /* Get the CDC control interface from the configuration descriptor */
- if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
- DComp_NextCDCControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
- {
- /* Descriptor not found, error out */
- return NoCDCInterfaceFound;
- }
- /* Get the IN and OUT data and IN notification endpoints for the CDC interface */
- while (FoundEndpoints != ((1 << CDC_NOTIFICATIONPIPE) | (1 << CDC_DATAPIPE_IN) | (1 << CDC_DATAPIPE_OUT)))
+ while (!(DataINEndpoint) || !(DataOUTEndpoint) || !(NotificationEndpoint))
{
- /* Fetch the next bulk or interrupt endpoint from the current CDC interface */
- if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+ /* See if we've found a likely compatible interface, and if there is an endpoint within that interface */
+ if (!(CDCControlInterface) ||
+ USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
DComp_NextCDCDataInterfaceEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
{
- /* Check to see if the control interface's notification pipe has been found, if so search for the data interface */
- if (FoundEndpoints & (1 << CDC_NOTIFICATIONPIPE))
+ /* Check if we have already found the control interface's notification endpoint or not */
+ if (NotificationEndpoint)
{
- /* Get the next CDC data interface from the configuration descriptor (CDC class has two CDC interfaces) */
- if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
- DComp_NextCDCDataInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+ /* Get the next CDC data interface from the configuration descriptor */
+ if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+ DComp_NextCDCDataInterface) != DESCRIPTOR_SEARCH_COMP_Found)
{
/* Descriptor not found, error out */
- return NoCDCInterfaceFound;
+ return NoCompatibleInterfaceFound;
}
+
+ /* Clear any found endpoints */
+ DataINEndpoint = NULL;
+ DataOUTEndpoint = NULL;
}
else
{
- /* Clear the found endpoints mask, since any already processed endpoints aren't in the CDC interface we need */
- FoundEndpoints = 0;
-
- /* Disable any already configured pipes from the invalid CDC interfaces */
- Pipe_SelectPipe(CDC_NOTIFICATIONPIPE);
- Pipe_DisablePipe();
- Pipe_SelectPipe(CDC_DATAPIPE_IN);
- Pipe_DisablePipe();
- Pipe_SelectPipe(CDC_DATAPIPE_OUT);
- Pipe_DisablePipe();
-
- /* Get the next CDC control interface from the configuration descriptor (CDC class has two CDC interfaces) */
+ /* Get the next CDC control interface from the configuration descriptor */
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
- DComp_NextCDCControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+ DComp_NextCDCControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
{
/* Descriptor not found, error out */
- return NoCDCInterfaceFound;
+ return NoCompatibleInterfaceFound;
}
- }
- /* Fetch the next bulk or interrupt endpoint from the current CDC interface */
- if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
- DComp_NextCDCDataInterfaceEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
- {
- /* Descriptor not found, error out */
- return NoEndpointFound;
+ /* Save the interface in case we need to refer back to it later */
+ CDCControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);
+
+ /* Clear any found endpoints */
+ NotificationEndpoint = 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);
- /* Check if the found endpoint is a interrupt or bulk type descriptor */
- if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
+ /* If the endpoint is a IN type endpoint */
+ if ((EndpointData->EndpointAddress & ENDPOINT_DIR_MASK) == ENDPOINT_DIR_IN)
{
- /* If the endpoint is a IN type interrupt endpoint */
- if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
- {
- /* Configure the notification pipe */
- Pipe_ConfigurePipe(CDC_NOTIFICATIONPIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
- EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
-
- Pipe_SetInterruptPeriod(EndpointData->PollingIntervalMS);
-
- /* Set the flag indicating that the notification pipe has been found */
- FoundEndpoints |= (1 << CDC_NOTIFICATIONPIPE);
- }
+ /* Check if the found endpoint is a interrupt or bulk type descriptor */
+ if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
+ NotificationEndpoint = EndpointData;
+ else
+ DataINEndpoint = EndpointData;
}
else
{
- /* Check if the endpoint is a bulk IN or bulk OUT endpoint */
- if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
- {
- /* Configure the data IN pipe */
- Pipe_ConfigurePipe(CDC_DATAPIPE_IN, EP_TYPE_BULK, PIPE_TOKEN_IN,
- EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
-
- /* Set the flag indicating that the data IN pipe has been found */
- FoundEndpoints |= (1 << CDC_DATAPIPE_IN);
- }
- else
- {
- /* Configure the data OUT pipe */
- Pipe_ConfigurePipe(CDC_DATAPIPE_OUT, EP_TYPE_BULK, PIPE_TOKEN_OUT,
- EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
-
- /* Set the flag indicating that the data OUT pipe has been found */
- FoundEndpoints |= (1 << CDC_DATAPIPE_OUT);
- }
+ DataOUTEndpoint = EndpointData;
}
}
+ /* Configure the CDC data IN pipe */
+ Pipe_ConfigurePipe(CDC_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN,
+ DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, PIPE_BANK_SINGLE);
+
+ /* Configure the CDC data OUT pipe */
+ Pipe_ConfigurePipe(CDC_DATA_OUT_PIPE, EP_TYPE_BULK, PIPE_TOKEN_OUT,
+ DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, PIPE_BANK_SINGLE);
+
+ /* Configure the CDC notification pipe */
+ Pipe_ConfigurePipe(CDC_NOTIFICATION_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
+ NotificationEndpoint->EndpointAddress, NotificationEndpoint->EndpointSize, PIPE_BANK_SINGLE);
+ Pipe_SetInterruptPeriod(NotificationEndpoint->PollingIntervalMS);
+
/* Valid data found, return success */
return SuccessfulConfigRead;
}
*/
uint8_t DComp_NextCDCControlInterface(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 CDC descriptor class, subclass and protocol, break out if correct control interface found */
- if ((DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Class == CDC_CONTROL_CLASS) &&
- (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).SubClass == CDC_CONTROL_SUBCLASS) &&
- (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Protocol == CDC_CONTROL_PROTOCOL))
+ if ((Interface->Class == CDC_CSCP_CDCClass) &&
+ (Interface->SubClass == CDC_CSCP_ACMSubclass) &&
+ (Interface->Protocol == CDC_CSCP_ATCommandProtocol))
{
return DESCRIPTOR_SEARCH_Found;
}
}
-
+
return DESCRIPTOR_SEARCH_NotFound;
}
*/
uint8_t DComp_NextCDCDataInterface(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 CDC descriptor class, subclass and protocol, break out if correct data interface found */
- if ((DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Class == CDC_DATA_CLASS) &&
- (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).SubClass == CDC_DATA_SUBCLASS) &&
- (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Protocol == CDC_DATA_PROTOCOL))
+ if ((Interface->Class == CDC_CSCP_CDCDataClass) &&
+ (Interface->SubClass == CDC_CSCP_NoDataSubclass) &&
+ (Interface->Protocol == CDC_CSCP_NoDataProtocol))
{
return DESCRIPTOR_SEARCH_Found;
}
}
-
+
return DESCRIPTOR_SEARCH_NotFound;
}
*/
uint8_t DComp_NextCDCDataInterfaceEndpoint(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);
-
- if ((EndpointType == EP_TYPE_BULK) || (EndpointType == EP_TYPE_INTERRUPT))
- return DESCRIPTOR_SEARCH_Found;
+ USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t);
+
+ if (((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_BULK) ||
+ ((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT))
+ {
+ 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;
}
+
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