Minor documentation enhancements.

[pub/USBasp.git] / Projects / MissileLauncher / ConfigDescriptor.c

diff --git a/Projects/MissileLauncher/ConfigDescriptor.c b/Projects/MissileLauncher/ConfigDescriptor.c
index 7214c7e..7ee2449 100644 (file)
--- a/Projects/MissileLauncher/ConfigDescriptor.c
+++ b/Projects/MissileLauncher/ConfigDescriptor.c
@@ -50,7 +50,10 @@ uint8_t ProcessConfigurationDescriptor(void)
        uint8_t  ConfigDescriptorData[512];
        void*    CurrConfigLocation = ConfigDescriptorData;
        uint16_t CurrConfigBytesRem;
-       uint8_t  FoundEndpoints = 0;
+       
+       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)))
@@ -64,51 +67,59 @@ uint8_t ProcessConfigurationDescriptor(void)
                default:
                        return ControlError;
        }
-       
-       /* Get the HID interface from the configuration descriptor */
-       if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
-                                     DComp_NextHIDInterface) != DESCRIPTOR_SEARCH_COMP_Found)
-       {
-               /* Descriptor not found, error out */
-               return NoHIDInterfaceFound;
-       }
 
-       while (FoundEndpoints != ((1 << HID_DATA_IN_PIPE) | (1 << HID_DATA_OUT_PIPE)))
+       while (!(DataINEndpoint) || !(DataOUTEndpoint))
        {
-               /* Get the next HID interface's data endpoint descriptor */
-               if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
-                                             DComp_NextInterfaceHIDDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
+               /* 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 (FoundEndpoints == (1 << HID_DATA_IN_PIPE))
+                       if (DataINEndpoint)
                          break;
-                               
-                       /* Descriptor not found, error out */
-                       return NoEndpointFound;
+                       
+                       /* Get the next HID interface from the configuration descriptor */
+                       if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+                                                                                 DComp_NextHIDInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+                       {
+                               /* 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(ConfigDescriptorData, USB_Descriptor_Endpoint_t);
+               USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);
 
                /* If the endpoint is a IN type endpoint */
                if (EndpointData->EndpointAddress & ENDPOINT_DESCRIPTOR_DIR_IN)
-               {
-                       /* Configure the HID data IN pipe */
-                       Pipe_ConfigurePipe(HID_DATA_IN_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_IN,
-                                                          EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
-
-                       FoundEndpoints |= (1 << HID_DATA_IN_PIPE);
-               }
+                 DataINEndpoint = EndpointData;
                else
-               {
-                       /* Configure the HID data OUT pipe */
-                       Pipe_ConfigurePipe(HID_DATA_OUT_PIPE, EP_TYPE_INTERRUPT, PIPE_TOKEN_OUT,
-                                                          EndpointData->EndpointAddress, EndpointData->EndpointSize, PIPE_BANK_SINGLE);
-                       
-                       FoundEndpoints |= (1 << HID_DATA_OUT_PIPE);             
-               }
+                 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;
@@ -148,7 +159,7 @@ uint8_t DComp_NextHIDInterface(void* CurrentDescriptor)
  *
  *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
  */
-uint8_t DComp_NextInterfaceHIDDataEndpoint(void* CurrentDescriptor)
+uint8_t DComp_NextHIDInterfaceDataEndpoint(void* CurrentDescriptor)
 {
        /* Determine the type of the current descriptor */
        if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)