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Replace blind interface descriptor search in the incomplete AndroidAccessoryHost demo with an intelligent search for the correct interface in the device matching the correct class/subclass/protocol values.

This commit is contained in:
Dean Camera 2011-07-10 07:15:57 +00:00
parent d9c16402b9
commit 55aadf97d5
2 changed files with 43 additions and 10 deletions
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48
Demos/Host/Incomplete/AndroidAccessoryHost/ConfigDescriptor.c
View File

@ -66,18 +66,17 @@ uint8_t ProcessConfigurationDescriptor(void)
default:
return DevControlError;
}
/* The Android Accessory Mode specification mandates that the accessory communications endpoints
be in the first interface descriptor (interface 0) */
USB_GetNextDescriptorOfType(&CurrConfigBytesRem, &CurrConfigLocation, DTYPE_Interface);
/* Ensure that an interface was found, and the end of the descriptor was not reached */
if (!(CurrConfigBytesRem))
return NoCompatibleInterfaceFound;
/* There should be only one compatible Android Accessory Mode interface in the device, attempt to find it */
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
DCOMP_NextAndroidAccessoryInterface) != DESCRIPTOR_SEARCH_COMP_Found)
{
return NoCompatibleInterfaceFound;
}
while (!(DataINEndpoint) || !(DataOUTEndpoint))
{
/* Get the next Still Image interface's data endpoint descriptor */
/* Get the next Android Accessory Mode interface's data endpoint descriptor */
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
DCOMP_NextInterfaceBulkEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
{
@ -111,7 +110,35 @@ uint8_t ProcessConfigurationDescriptor(void)
* 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
* This comparator searches for the next Interface descriptor containing the correct Android Accessory Mode Class, Subclass
* and Protocol values.
*
* \return A value from the DSEARCH_Return_ErrorCodes_t enum
*/
uint8_t DCOMP_NextAndroidAccessoryInterface(void* const CurrentDescriptor)
{
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);
if ((Interface->Class == ANDROID_INTERFACE_CLASS) &&
(Interface->SubClass == ANDROID_INTERFACE_SUBCLASS) &&
(Interface->Protocol == ANDROID_INTERFACE_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 bulk 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
@ -125,6 +152,7 @@ uint8_t DCOMP_NextInterfaceBulkEndpoint(void* const CurrentDescriptor)
USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t);
uint8_t EndpointType = (Endpoint->Attributes & EP_TYPE_MASK);
if ((EndpointType == EP_TYPE_BULK) && (!(Pipe_IsEndpointBound(Endpoint->EndpointAddress))))
return DESCRIPTOR_SEARCH_Found;
}

5
Demos/Host/Incomplete/AndroidAccessoryHost/ConfigDescriptor.h
View File

@ -42,6 +42,10 @@
/* Macros: */
#define ANDROID_DATA_IN_PIPE 1
#define ANDROID_DATA_OUT_PIPE 2
#define ANDROID_INTERFACE_CLASS 0xFF
#define ANDROID_INTERFACE_SUBCLASS 0x42
#define ANDROID_INTERFACE_PROTOCOL 0x01
/* Enums: */
/** Enum for the possible return codes of the \ref ProcessConfigurationDescriptor() function. */
@ -57,6 +61,7 @@
/* Function Prototypes: */
uint8_t ProcessConfigurationDescriptor(void);
uint8_t DCOMP_NextAndroidAccessoryInterface(void* const CurrentDescriptor);
uint8_t DCOMP_NextInterfaceBulkEndpoint(void* CurrentDescriptor);
#endif