USB endpoint 0 transfers

William Kozlowski

I am developing code which requires the use of endpoint 0 for vendor specific commands. I am having difficulty transfering data back to the host. I am using modified starter ware code for the USB. I am calling the routine USBDCDSendDataEP0 to transfer the data. I receive the command from the host and the host sees my acknowledgement.

The host program doesn't see the data. It seems the transmit packet ready bit of the PERI_TXCSR is not getting set for this transfer. When looking at the spec (spruh73f) it talks about this bit but unless I wrong the definition of the register is never clearly defined.

So where can I get a clear definition of this register and any assistance on why the data packet is not be sent would be much appreciated.

over 13 years ago

0 -DK- over 13 years ago

TI__Mastermind 27890 points

William,

An NDA is required for the complete description of the core registers, but you may be able to get what you need from this document (http://www.ti.com/lit/ug/sprufy9/sprufy9.pdf; section 4.60) which is for a different device using the same Mentor core. It goes into much more detail regarding the programming of the Mentor core as well as describing the relevant registers and programming model in more detail.

0 William Kozlowski over 13 years ago in reply to -DK-

Prodigy 200 points

I was interested in the registers only to verify their contents during my debug. My real issue is why doesn't the data packet I write on endpoint 0 show up on the host?

0 Dinesh Suresh over 10 years ago

Prodigy 60 points

Hallo

I am currently working on LM3S9B81 microcontroller for USB Operation.

I want to know how do you see the messages in the PC.

Should we use any software or nrmal JTAG Debugger would work?

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USB endpoint 0 transfers