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Added support to the CDCHost demo for devices with mutiple CDC interfaces which are not the correct ACM type preceeding the desired ACM CDC interface.

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This commit is contained in:
Dean Camera 2009-04-07 11:46:54 +00:00
parent cb7884da50
commit 51910b4505
3 changed files with 41 additions and 9 deletions
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45
Demos/Host/CDCHost/ConfigDescriptor.c
View File

@ -69,8 +69,8 @@ uint8_t ProcessConfigurationDescriptor(void)
if (DESCRIPTOR_TYPE(ConfigDescriptorData) != DTYPE_Configuration)
return InvalidConfigDataReturned;
/* Get the CDC interface from the configuration descriptor */
if (USB_Host_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData, NextCDCInterface))
/* Get the CDC control interface from the configuration descriptor */
if (USB_Host_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData, NextCDCControlInterface))
{
/* Descriptor not found, error out */
return NoCDCInterfaceFound;
@ -83,11 +83,24 @@ uint8_t ProcessConfigurationDescriptor(void)
if (USB_Host_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData,
NextInterfaceCDCDataEndpoint))
{
/* Get the next CDC interface from the configuration descriptor (CDC class has two CDC interfaces) */
if (USB_Host_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData, NextCDCInterface))
/* 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))
{
/* Descriptor not found, error out */
return NoCDCInterfaceFound;
/* Get the next CDC data interface from the configuration descriptor (CDC class has two CDC interfaces) */
if (USB_Host_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData, NextCDCDataInterface))
{
/* Descriptor not found, error out */
return NoCDCInterfaceFound;
}
}
else
{
/* Get the next CDC control interface from the configuration descriptor (CDC class has two CDC interfaces) */
if (USB_Host_GetNextDescriptorComp(&ConfigDescriptorSize, &ConfigDescriptorData, NextCDCControlInterface))
{
/* Descriptor not found, error out */
return NoCDCInterfaceFound;
}
}
/* Fetch the next bulk or interrupt endpoint from the current CDC interface */
@ -155,11 +168,11 @@ 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 Interface descriptor of the correct CDC Class, Subclass and Protocol values.
* This comparator searches for the next Interface descriptor of the correct CDC control Class, Subclass and Protocol values.
*
* \return A value from the DSEARCH_Return_ErrorCodes_t enum
*/
DESCRIPTOR_COMPARATOR(NextCDCInterface)
DESCRIPTOR_COMPARATOR(NextCDCControlInterface)
{
if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
{
@ -170,7 +183,23 @@ DESCRIPTOR_COMPARATOR(NextCDCInterface)
{
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 Interface descriptor of the correct CDC data Class, Subclass and Protocol values.
*
* \return A value from the DSEARCH_Return_ErrorCodes_t enum
*/
DESCRIPTOR_COMPARATOR(NextCDCDataInterface)
{
if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Interface)
{
/* 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) &&

3
Demos/Host/CDCHost/ConfigDescriptor.h
View File

@ -77,7 +77,8 @@
};
/* Configuration Descriptor Comparison Functions: */
DESCRIPTOR_COMPARATOR(NextCDCInterface);
DESCRIPTOR_COMPARATOR(NextCDCControlInterface);
DESCRIPTOR_COMPARATOR(NextCDCDataInterface);
DESCRIPTOR_COMPARATOR(NextInterfaceCDCDataEndpoint);
/* Function Prototypes: */

2
LUFA/ChangeLog.txt
View File

@ -24,6 +24,8 @@
* code without having to be itself patched and recompiled first
* - Added preprocessor checks and documentation to the bootloaders giving information about missing SIGNATURE_x defines due to
* outdated avr-libc versions.
* - Added support to the CDCHost demo for devices with mutiple CDC interfaces which are not the correct ACM type preceeding the desired
* ACM CDC interface
*
* \section Sec_ChangeLog090401 Version 090401
*