Dear USB People,

I have a Question regarding USB 1.1 Endpoint .

First Let me describe what I'm doing using USB Core.

I developed PS2 Keyboard to USB application using USB 1.1 core. I wrote PS2
Interface logic and gluelogic to store ASCII value of the Pressed Key in Endpoint 5.
[ Endpoint 5 is configured as IN , INTERRUPT with max of 64 Byte transfer. I use
Windriver USB software to read USB Port.

ep5_cfg = `INT | `IN | 14'd0001

Device Enumeration is taking place properly and i could see all the endpoints with the
same setup mentioned in usb1_rom.v file.

The Problem i'm facing is like , what ever the data i type in Keyboard , It is read and
displayed TWICE. I checked the behavioral simulation and saw that the data is stored
in Endpoint FIFO only once with WE for FIFO is kept asserted for 1 Clock Pulse.

I even tried to store the data into Endpoint FIFO continuously and then Invoked
Windriver software. Then also each character is displayed TWICE [ i.e., . i Typed
rama ..But i received as ..rraammaa ].

Is this the Problem with INTERRUPT Transfer Mechanism the way i configred.
or
Could it be the Problem of Windriver Software ?..

Can anyone clarify me where exactly the Problem and how can i overcome this ?

It would be grate Helpful for me.

Thanks in Advance ,
Ramachandiran.V

** Reply Requested When Convenient **

Hi

Have you also seen that you only read data once from the fifo?

/sip


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Dear USB People, I have a Question regarding USB 1.1 Endpoint . First Let me describe what I'm doing using USB Core. I developed PS2 Keyboard to USB application using USB 1.1 core. I wrote PS2 Interface logic and gluelogic to store ASCII value of the Pressed Key in Endpoint 5. [ Endpoint 5 is configured as IN , INTERRUPT with max of 64 Byte transfer. I use Windriver USB software to read USB Port. ep5_cfg = `INT | `IN | 14'd0001 Device Enumeration is taking place properly and i could see all the endpoints with the same setup mentioned in usb1_rom.v file. The Problem i'm facing is like , what ever the data i type in Keyboard , It is read and displayed TWICE. I checked the behavioral simulation and saw that the data is stored in Endpoint FIFO only once with WE for FIFO is kept asserted for 1 Clock Pulse. I even tried to store the data into Endpoint FIFO continuously and then Invoked Windriver software. Then also each character is displayed TWICE [ i.e., . i Typed rama ..But i received as ..rraammaa ]. Is this the Problem with INTERRUPT Transfer Mechanism the way i configred. or Could it be the Problem of Windriver Software ?.. Can anyone clarify me where exactly the Problem and how can i overcome this ? It would be grate Helpful for me. Thanks in Advance , Ramachandiran.V _______________________________________________ http://www.opencores.org/mailman/listinfo/usb

On Sat, 2005-01-15 at 11:45 +0100, ramachandiran.v@st.com wrote: Replace your keyboard with a 3 bit counter. Add 0x30 to the counter output and write that to the FIFO. If you see a continues 0...7 with out any repeats, the problem is in your keyboard interface/interpretation logic. If you see something like 001122..77 than there is a problem with the USB IP Core/FIFO ... Regards, rudi ============================================================= Rudolf Usselmann, ASICS World Services, http://www.asics.ws Your Partner for IP Cores, Design, Verification and Synthesis