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Date of registration: Oct 20th 2010

Posts: 4


Thursday, April 14th 2016, 8:30am

USB CDC communication gives stall packet in PC side randomly


We are using the Segger emUSB CDC with embOS in our product, with LPC2478. on continuous use of the system we are seeing sometimes the PC side gets in packet stall and the communication stops. If you have seen these issue can you let us know what can be probable cause of this issue. We are using the blocking call of USB_CDC_Write to transfer the data. the System side keeps on running.and in order to restore the communication we had to disconnect and connect back again.

Any input will be welcomed...

:love: Satya


Super Moderator

Date of registration: Feb 28th 2014

Posts: 26


Monday, May 2nd 2016, 5:44pm

Hello Satya,

Does the device side send the stall to the PC side?
Which endpoints is stalled?
Do you have a USB analyzer log?