/*
LUFA Library
Copyright (C) Dean Camera, 2010.
-
+
dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
+ www.lufa-lib.org
*/
/*
Copyright 2010 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
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* HIDInterface = 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)))
default:
return ControlError;
}
-
- /* Get the first HID interface from the configuration descriptor */
- if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
- DComp_NextHIDInterface) != DESCRIPTOR_SEARCH_COMP_Found)
- {
- /* Descriptor not found, error out */
- return NoCompatibleInterfaceFound;
- }
while (!(DataINEndpoint) || !(DataOUTEndpoint))
{
- /* Get the next HID 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 (!(HIDInterface) ||
+ USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
DComp_NextHIDInterfaceDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
{
/* 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 (DataINEndpoint)
break;
-
- /* Clear any found endpoints */
- DataOUTEndpoint = NULL;
/* Get the next HID interface from the configuration descriptor */
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
/* 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);
+
+ /* Clear any found endpoints */
+ 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);
else
DataOUTEndpoint = EndpointData;
}
-
+
/* Configure the HID data IN pipe */
Pipe_ConfigurePipe(HID_DATA_IN_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, PIPE_BANK_SINGLE);
Pipe_SetInterruptPeriod(DataINEndpoint->PollingIntervalMS);
-
+
/* Check if the HID interface contained an optional OUT data endpoint */
if (DataOUTEndpoint)
{
/* Configure the HID data OUT pipe */
Pipe_ConfigurePipe(HID_DATA_OUT_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_OUT,
DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, PIPE_BANK_SINGLE);
- }
-
+ }
+
/* Valid data found, return success */
return SuccessfulConfigRead;
}
*/
uint8_t DComp_NextHIDInterface(void* CurrentDescriptor)
{
+ USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
+
/* Determine if the current descriptor is an interface descriptor */
- if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
+ 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 (DESCRIPTOR_CAST(CurrentDescriptor, USB_Descriptor_Interface_t).Class == HID_CLASS)
+ if (Interface->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;
}
*/
uint8_t DComp_NextHIDInterfaceDataEndpoint(void* CurrentDescriptor)
{
+ USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
+
/* Determine the type of the current descriptor */
- if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
+ if (Header->Type == DTYPE_Endpoint)
{
/* Indicate that the descriptor being searched for has been found */
return DESCRIPTOR_SEARCH_Found;
}
- else if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
+ else if (Header->Type == 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;
+ else
+ {
+ /* Current descriptor does not match what this comparator is looking for */
+ return DESCRIPTOR_SEARCH_NotFound;
+ }
}
+
projects / pub / USBasp.git / blobdiff