Hi,

It is the function drivers responsibility to send a zero-length packet for bulk 
out pipes as this is protocol dependent.  You can send a zero-length packet the 
same way you would send a 512 byte packet but with a length of 0.

Regards,

Scott  


> On Nov 25, 2015, at 9:59 PM, lyf4 Science <[email protected]> wrote:
> 
> Hi Experts,
> 
> How to send the zero length packet in Bulk OUT EP from MAC OS X 10.10 USB 
> driver ?
> 
> When I am sending 512 bytes of max packet size the ZLP is not sent by default 
> from the MAC OS X 10.10 USB driver.
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