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01/15/06 00:55
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 		 #107414 - USB Design By Example
Responding to: ???'s previous message
Saalam Mehdi,

According to my book (assuming I am reading this correctly), USB Design By Example (a very good book that I recommend if you plan to do much with USB), your device should not send the ACK packet for this request. Your device should respond directly to the request with the Device Descriptor and the PC Host should then send the ACK. Stated over, when your device receives the Device Descriptor Request, it should transmit the 18 bytes of the Device Descriptor and then look for the ACK to come from the PC.

If you are interested, the book's ISBN is 0-9702846-5-9.

Good Luck

Joe

List of 88 messages in thread
TopicAuthorDate
USB Enumeration Process!!!            01/01/70 00:00      
   USB Design By Example            01/01/70 00:00      
      USB Design By Example            01/01/70 00:00      
         Hi.            01/01/70 00:00      
            Jan Axelson            01/01/70 00:00      
            Salaam            01/01/70 00:00      
               Salaam, Saalam and Thank you.            01/01/70 00:00      
                  fires            01/01/70 00:00      
                     It's out. All is well.            01/01/70 00:00      
                        weather            01/01/70 00:00      
                           Normal Weather            01/01/70 00:00      
                           good for you            01/01/70 00:00      
            D12!            01/01/70 00:00      
               Firmware Programming Guide for D12!            01/01/70 00:00      
                  I'll get back            01/01/70 00:00      
                     Thanks            01/01/70 00:00      
   I don't think you ever send descriptor .            01/01/70 00:00      
      Thanks            01/01/70 00:00      
         Descriptor IDs            01/01/70 00:00      
      But i think i must do!            01/01/70 00:00      
         Edit!            01/01/70 00:00      
            Main Loop            01/01/70 00:00      
               Try USB.org            01/01/70 00:00      
                  I don't know why d12 don't interrupted            01/01/70 00:00      
               I don't know why d12 don't interrupted            01/01/70 00:00      
                  I don't know why d12 don't interrupted            01/01/70 00:00      
                     I don't know why d12 don't interrupted            01/01/70 00:00      
                  Acknowledge setup?            01/01/70 00:00      
                     Thanks Tsuneo ,            01/01/70 00:00      
                        Sorry, I confused            01/01/70 00:00      
                           Sorry, I confused            01/01/70 00:00      
                              Just A Question!            01/01/70 00:00      
                                 It's OK, just for enumeration            01/01/70 00:00      
                                    Any error code on Control In EP?            01/01/70 00:00      
                                       Zero Length Packet !!!            01/01/70 00:00      
                                          ZLP??            01/01/70 00:00      
                                             ZLP??            01/01/70 00:00      
                                                ZLP itself is not the key            01/01/70 00:00      
                                                   the code to write the descriptor            01/01/70 00:00      
                                                      VALIDATE_BUFFER            01/01/70 00:00      
                                                         VALIDATE_BUFFER            01/01/70 00:00      
                                                            VALIDATE_BUFFER            01/01/70 00:00      
                                                               Not exactly            01/01/70 00:00      
                                                                  'Read buffer' and 'Write buffer'            01/01/70 00:00      
                                                                     'Read buffer' and 'Write buffer'            01/01/70 00:00      
                                                                        VALIDATE_BUFFER ?            01/01/70 00:00      
                                                                           VALIDATE_BUFFER ?            01/01/70 00:00      
                                                                              Your code            01/01/70 00:00      
                                                                                 Bulk Mail            01/01/70 00:00      
                                                                                    SEND_REQUESTED_DESCRIPTOR            01/01/70 00:00      
                                                                                       Incredible Progress            01/01/70 00:00      
                                                                                          ZLP on Control-IN            01/01/70 00:00      
                                                                                             Control IN and Control OUT transfer            01/01/70 00:00      
                                                                                                Thanks for your responses,            01/01/70 00:00      
                                                                                                   SET_ADDRESS            01/01/70 00:00      
                                                                                                      Some Questions...            01/01/70 00:00      
                                                                                                         SET_DESCRIPTOR            01/01/70 00:00      
                                                                                                            Control transfer            01/01/70 00:00      
                                                                                                               Control transfer            01/01/70 00:00      
                                                                                                                  the whole picture            01/01/70 00:00      
                                                                                                                     The Whole Picture,Thanks            01/01/70 00:00      
                                                                                                                        IN EP interrupt after sending packet            01/01/70 00:00      
                                                                                                                           Two USB communication procedure            01/01/70 00:00      
                                                                                                            comment...            01/01/70 00:00      
                                                                                             zlp!            01/01/70 00:00      
                                                                                             zlp!            01/01/70 00:00      
                                                         misunderstanding!            01/01/70 00:00      
   send an e-mail to your friendly local Ph            01/01/70 00:00      
   waiting for a techie, so I rummaged a bi            01/01/70 00:00      
   A Question?            01/01/70 00:00      
      declared in bMaxPacketSize            01/01/70 00:00      
   Source Code!            01/01/70 00:00      
      Source is Edited now!            01/01/70 00:00      
      Source is Edited!            01/01/70 00:00      
   D12 Example in "USB Design By Example"            01/01/70 00:00      
   Configuration Descriptor!            01/01/70 00:00      
      The 2nd Get_Descriptor            01/01/70 00:00      
         Thanks Tsuneo            01/01/70 00:00      
            Isn't it the config. desc. request?            01/01/70 00:00      
               Best For You Tsuneo !            01/01/70 00:00      
               Thanks            01/01/70 00:00      
      Strings            01/01/70 00:00      
         Thanks Thomas            01/01/70 00:00      
            Correction            01/01/70 00:00      
               USBView and UVCView            01/01/70 00:00      
               Thanks Thomas            01/01/70 00:00      
   Set DMA Mode!            01/01/70 00:00      
      It's optional            01/01/70 00:00      

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