USB failure in piccolo F28069

Naresh,

That's an interesting problem.  Thanks for the youtube video, that helps me better understand the situation.

I'm curious if you've ever tried using other flash drives?  It seems like something in the drive stops working and causes the piccolo to crash.  Perhaps the flash drive is just bad.

BR,

Thanks for quick reply,

I have used different flash drive with 1GB, 2GB,4GB,8GB. but in all same problem occurs.

I have also checked stellaris forum in which there are many posts about USB hang in this function but not able to find perfect solution.

you can also check my previous post in which I have shared links of my previous posts for detail schematics and testing.

Regards,

Naresh

Naresh,

Here is what I think is happening:

1. USB Connects and everything is fine
2. Tapping the drive causes a loose connection and the data lines become disconnected temporarily.
3. The disconnection is happening during a read or write to the pipes, which is why we get stuck at that while loop
4. The while loop is waiting for a change in the state machine which comes from an interrupt.  Because we got disconnected the interrupt never comes and we get stuck.

Thanks Trey once again,

I just double checked by calling USBHCDTerm followed by USBHCDInit  but still not worked.

you can also show my post,

http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/245058.aspx

in which you can see my efforts to solve this problems but not successed.

Can you just tell me code what to do when this problem occurs? 

I want to resume my USB operation without repulgin USB.

I think this time you help me to solve this problem.

Regards,

Naresh

Naresh,

I tried recreating the issue here using the usb_host_msc example and have been unsuccessful thus far.  I plug and unplugged rapidly and every time it reconnected without any changes to the stock example.  Is there anyway you could try running the example on your hardware without the rest of the application running?  I think we might be missing an interrupt which could be causing the stack to get messed up.

BR,

Thanks Trey,

I found out why this had happened. I have higher priority EPWM interrupt(Called every 333us and takes 150us to execute), All other interrupt viz Timer0 interrupt, ECAP interrupt, EQEP interrupt are of a higher priority than USB.

If I set USB interrupt at the highest level then USB can be reconnected repeatedly without any problem.

Unfortunately, I can not set USB interrupt at the highest level in my application.

The Question is how to restart the USB after it has gone in endless loop in the USB code without tripping the Watchdog timer?

Regards,

Naresh

Naresh,

You'll have to modify the USB stack in order to do this.  I would recommend adding a conditional statement that will break out of that loop, and I would assert that conditional from something like a timer ISR.

BR,