Nios® V/II Embedded Design Suite (EDS)
Support for Embedded Development Tools, Processors (SoCs and Nios® V/II processor), Embedded Development Suites (EDSs), Boot and Configuration, Operating Systems, C and C++
12600 Discussions

Not able to read device description of pen drive via USB interface.

Altera_Forum
Honored Contributor II
‎09-26-2015 07:20 AM
1,009 Views

Hello everyone! 

I am trying to execute a C code in Nios IDE to create a file in pen drive connected to Micron Nand flash via USB. 

After running the program, file system is succesfuly initialized, USB host stack is also created and initialized. 

 

Then I connect the pen drive and the message : 

"Device connected. Device speed is full speed (12 Mb/s)" will be displayed. 

Later an error : "USBH_DevDescRd: 3119, err = -4" appears. 

 

I think this means that the device description is not being read successfully. Why is this happening? how to eliminate this error? 

please help, any advice is welcome...
0 Kudos

Link Copied

2 Replies
Altera_Forum
Honored Contributor II
‎09-26-2015 07:34 AM
303 Views

Some pen drives include additional devices (security, etc). Simplistic software like most embedded libraries can't deal with this. Sometimes USB hub(s) are also included. I'd suggest trying your code with a variety of different brands, models, sizes of pen drives and use the ones that work. That's easier than debugging a more complex pen drive. If your device needs to work with any generic pen drive, I'd suggest purchasing a commercial USB and file system stack for embedded devices rather than relying on code from a demo. 

 

Also, it's not considered polite to post the same question in multiple forum areas.
0 Kudos
Copy link
Altera_Forum
Honored Contributor II
‎09-28-2015 04:53 AM
303 Views

Sure Galfonz, I will try with various pen drives.  

I sincerely apologize for posting the same question.
0 Kudos
Copy link
Reply

Community support is provided during standard business hours (Monday to Friday 7AM - 5PM PST). Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.