Make Host mode Class drivers only set the class driver instance's state values once...

[pub/USBasp.git] / LUFA / Drivers / USB / Class / Host / Printer.c

diff --git a/LUFA/Drivers/USB/Class/Host/Printer.c b/LUFA/Drivers/USB/Class/Host/Printer.c
index 6b16228..773b9b4 100644 (file)
--- a/LUFA/Drivers/USB/Class/Host/Printer.c
+++ b/LUFA/Drivers/USB/Class/Host/Printer.c
@@ -40,43 +40,31 @@ uint8_t PRNT_Host_ConfigurePipes(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceI
                                  uint16_t ConfigDescriptorSize,
                                                             void* DeviceConfigDescriptor)
 {
-       USB_Descriptor_Endpoint_t*  DataINEndpoint  = NULL;
-       USB_Descriptor_Endpoint_t*  DataOUTEndpoint = NULL;
+       USB_Descriptor_Endpoint_t*  DataINEndpoint   = NULL;
+       USB_Descriptor_Endpoint_t*  DataOUTEndpoint  = NULL;
+       USB_Descriptor_Interface_t* PrinterInterface = NULL;
 
        memset(&PRNTInterfaceInfo->State, 0x00, sizeof(PRNTInterfaceInfo->State));
 
        if (DESCRIPTOR_TYPE(DeviceConfigDescriptor) != DTYPE_Configuration)
          return PRNT_ENUMERROR_InvalidConfigDescriptor;
-       
-       if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &DeviceConfigDescriptor,
-                                     DCOMP_PRNT_Host_NextPRNTInterface) != DESCRIPTOR_SEARCH_COMP_Found)
-       {
-               return PRNT_ENUMERROR_NoCompatibleInterfaceFound;
-       }
-
-       PRNTInterfaceInfo->State.InterfaceNumber  = DESCRIPTOR_PCAST(DeviceConfigDescriptor,
-                                                                    USB_Descriptor_Interface_t)->InterfaceNumber;
-       PRNTInterfaceInfo->State.AlternateSetting = DESCRIPTOR_PCAST(DeviceConfigDescriptor,
-                                                                    USB_Descriptor_Interface_t)->AlternateSetting;
-       
+               
        while (!(DataINEndpoint) || !(DataOUTEndpoint))
        {
-               if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &DeviceConfigDescriptor,
+               if (!(PrinterInterface) ||
+                   USB_GetNextDescriptorComp(&ConfigDescriptorSize, &DeviceConfigDescriptor,
                                              DCOMP_PRNT_Host_NextPRNTInterfaceEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
                {
-                       DataINEndpoint  = NULL;
-                       DataOUTEndpoint = NULL;
-
                        if (USB_GetNextDescriptorComp(&ConfigDescriptorSize, &DeviceConfigDescriptor,
                                                                                  DCOMP_PRNT_Host_NextPRNTInterface) != DESCRIPTOR_SEARCH_COMP_Found)
                        {
                                return PRNT_ENUMERROR_NoCompatibleInterfaceFound;
                        }
                        
-                       PRNTInterfaceInfo->State.InterfaceNumber  = DESCRIPTOR_PCAST(DeviceConfigDescriptor,
-                                                                                    USB_Descriptor_Interface_t)->InterfaceNumber;
-                       PRNTInterfaceInfo->State.AlternateSetting = DESCRIPTOR_PCAST(DeviceConfigDescriptor,
-                                                                                    USB_Descriptor_Interface_t)->AlternateSetting;     
+                       PrinterInterface = DESCRIPTOR_PCAST(DeviceConfigDescriptor, USB_Descriptor_Interface_t);        
+
+                       DataINEndpoint  = NULL;
+                       DataOUTEndpoint = NULL;
 
                        continue;
                }
@@ -109,6 +97,8 @@ uint8_t PRNT_Host_ConfigurePipes(USB_ClassInfo_PRNT_Host_t* const PRNTInterfaceI
                }
        }
 
+       PRNTInterfaceInfo->State.InterfaceNumber  = PrinterInterface->InterfaceNumber;
+       PRNTInterfaceInfo->State.AlternateSetting = PrinterInterface->AlternateSetting;
        PRNTInterfaceInfo->State.IsActive = true;
 
        return PRNT_ENUMERROR_NoError;