ZYNQ USB CDC CLASS

[a@1]

Hi,

I ran "ZYNQ USB CDC CLASS" code exampleattaching link for reference,

http://www.wiki.xilinx.com/Zynq-7000+AP+SoC+USB+CDC+Device+Class+Design+Example+Techtip?responseToken=6b694ae29092192587a29af9b83fe3ad

,it was fine,but when I tried inserting USB to PC,it is showing unknown device.Please help me ,thanks in advance.

[vanmierlo]

Which OS is running on the PC? Only Linux, OSX and Windows10 natively support USB CDC.

For an older Windows you can use Zadig to install a CDC driver.

[a@1]

Hi,

I tried using zadig,it tells driver update failed.I am using windows 7,32bit.

[a@1]

Hi ,

Actually I tried the method you tried.It worked after a long time.Multiple trials it worked ,but when I powered on after a day,again the same issue is seen.Is there any temperature issue?I am using zynq 7z030 with USB3320 chip.Please help me in this .Thanks in advance.

[vanmierlo]

I'm afraid I have never tried to make a Zynq a CDC device, only other MCU's.

[martin6314]

Hi

I had a similar problem with our USB2 hardware. The BSP required me to add the following
after XUsbPsu_CfgInitialize to force the library use HIGHSPEED instead of SUPERSPEED:

XUsbPsu_SetSpeed(&UsbInstance, XUSBPSU_DCFG_HIGHSPEED); // The BSP sets SuperSpeed

Best regards
Martin

[a@1]

Thanks Martin,

But   I have other issue.when I try to run mass storage device,every time I run through JTAG,each time it asks for format.How to avoid it?

[martin6314]

The sample code generates an empty ram disk, that can be accessed via USB mass storage.
This disk is empty as you start the hardware and does not contain the file system pattern. 
Therefore you have to format it. 
If you want to avoid this, you have to make sure the ram disk is initialized in the code with the file system information during startup. 

Best regards Martin

[a@1]

Thanks MArtin,

It worked...

[a@1]

Hi,

I have one more question.How can I create files in the available disk space.At present ,I have created FAT16 OS in ZYNQ.

Thanks in advance

[a@1]

Hi,


I have one more question.How can I create files in the available disk space.At present ,I have created FAT16 OS in ZYNQ.


Thanks in advance

[vanmierlo]

Why is this thread suddenly about USB-MSD instead of USB-CDC?