USB on MIMXRT1176

[ahmedhrabi]

Hi, 

I'am working on USB on the MIMXRT1176 and i have some questions: 

1- I tested CDC class VCOM, but the speed seems to be slow for my usage (~300 KB/s), am i looping something to speed up the transfer? I tested the MSC class and the transfer speed reached about 5MB/s, i don't understand why i can't reach such speed on CDC class.

2- For the CDC VNIC SDK example project, there's no lwip stack, how can i test transfer (file or data) with this example for the RNDIS class ?

3- Is there a specific recommended class to reach high speed transfer on USB ?

Regards. 

[EdwinHz · Accepted solution]

Hi @ahmedhrabi,

MSC is expected to be faster by definition. CDC often contains much more back and forth and setup data than MSC.

The lwip stack can be found on our lwip examples on the SDK.

BR,

Edwin.