pca10059 usb serial throughput is too slow. possible to increase?

RE: pca10059 usb serial throughput is too slow. possible to increase?

Hung Bui — Thu, 25 Jul 2019 14:14:41 GMT

Hi Choi,

We had some test on the CDC USB through put here.

As you can see the throughput on Windows can get to 1720kb/s

Terje already mentioned that when you do serialization, you loose a lot for over head. In addition the protocol wasn't optimized for high throughput application.

In your case, I assume you just need to transmit data between PC and NRF52, why not access UART/USB directly and modify ble_app_att_mtu_throughput example to exchange data with PC. This way you have full control over how UART/USB data is sent to/ receive from PC ?

RE: pca10059 usb serial throughput is too slow. possible to increase?

hyeongseob — Fri, 19 Jul 2019 00:11:54 GMT

Hi,

I targeted about 900kbps. before start this work, I expected that speed because 2Mphy throughput(about 1300kbps). and USB full speed support 12Mbps .

thanks.

RE: pca10059 usb serial throughput is too slow. possible to increase?

tesc — Thu, 18 Jul 2019 13:07:24 GMT

Hi,

There is some overhead in the serialization, although I have not succeeded in figuring out how much is to be expected. It is summer vacation season in Norway, and the engineers who would know are currently out-of-office. This means it may take some time before you can get a proper answer.

What throughput are you targeting for?

Regards,
Terje