cancel
Showing results for 
Search instead for 
Did you mean: 

USB Superspeed Peripherals

Anonymous
Not applicable

While implementing  a Windows 7 application to read data from IN endpoints I started by following closely “the letter of the law” and looped the CyAPI XferData call to the driver with a buffer length and length according to the documentation namely 512 bytes for high speed and 1024 for super speed. This resulted in very poor performance, as I was missing data. Next I decided to see if I used for the aforementioned call bigger buffer length, which immediately improved performance. However, the upper limit I hit was 32K size buffers, which is really good but for the fact that I still miss some data in between XferData calls. I would appreciate anybody on the forum that may have a solution for me, even if it means making changes to the device driver to handle much bigger buffer transfers.

0 Likes
1 Reply