/*
LUFA Library
Copyright (C) Dean Camera, 2010.
-
+
dean [at] fourwalledcubicle [dot] com
www.fourwalledcubicle.com
*/
/*
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
* 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* MSInterface = 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 mass storage interface from the configuration descriptor */
- if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
- DComp_NextMSInterface) != DESCRIPTOR_SEARCH_COMP_Found)
- {
- /* Descriptor not found, error out */
- return NoInterfaceFound;
- }
- /* Get the IN and OUT data endpoints for the mass storage interface */
- while (FoundEndpoints != ((1 << MASS_STORE_DATA_IN_PIPE) | (1 << MASS_STORE_DATA_OUT_PIPE)))
+ while (!(DataINEndpoint) || !(DataOUTEndpoint))
{
- /* Fetch the next bulk endpoint from the current mass storage 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 (!(MSInterface) ||
+ USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
DComp_NextMSInterfaceBulkDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
{
- /* Descriptor not found, error out */
- return NoEndpointFound;
+ /* Get the next Mass Storage interface from the configuration descriptor */
+ if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+ DComp_NextMSInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+ {
+ /* Descriptor not found, error out */
+ return NoCompatibleInterfaceFound;
+ }
+
+ /* Save the interface in case we need to refer back to it later */
+ MSInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);
+
+ /* Clear any found endpoints */
+ DataINEndpoint = NULL;
+ 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);
- /* Check if the endpoint is a bulk IN or bulk OUT endpoint, set appropriate globals */
+ /* If the endpoint is a IN type endpoint */
if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
- {
- /* Configure the data IN pipe */
- Pipe_ConfigurePipe(MASS_STORE_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN,
- EndpointData->EndpointAddress, EndpointData->EndpointSize,
- PIPE_BANK_DOUBLE);
-
- /* Set the flag indicating that the data IN pipe has been found */
- FoundEndpoints |= (1 << MASS_STORE_DATA_IN_PIPE);
- }
+ DataINEndpoint = EndpointData;
else
- {
- /* Configure the data OUT pipe */
- Pipe_ConfigurePipe(MASS_STORE_DATA_OUT_PIPE, EP_TYPE_BULK, PIPE_TOKEN_OUT,
- EndpointData->EndpointAddress, EndpointData->EndpointSize,
- PIPE_BANK_DOUBLE);
-
- /* Set the flag indicating that the data OUT pipe has been found */
- FoundEndpoints |= (1 << MASS_STORE_DATA_OUT_PIPE);
- }
+ DataOUTEndpoint = EndpointData;
}
+ /* Configure the Mass Storage data IN pipe */
+ Pipe_ConfigurePipe(MASS_STORE_DATA_IN_PIPE, EP_TYPE_BULK, PIPE_TOKEN_IN,
+ DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, PIPE_BANK_SINGLE);
+
+ /* Configure the Mass Storage data OUT pipe */
+ Pipe_ConfigurePipe(MASS_STORE_DATA_OUT_PIPE, EP_TYPE_BULK, PIPE_TOKEN_OUT,
+ DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, PIPE_BANK_SINGLE);
+
/* Valid data found, return success */
return SuccessfulConfigRead;
}
return DESCRIPTOR_SEARCH_Found;
}
}
-
+
return DESCRIPTOR_SEARCH_NotFound;
}
return DESCRIPTOR_SEARCH_NotFound;
}
+
projects / pub / USBasp.git / blobdiff