Fastest way to dump data over USB

RE: Fastest way to dump data over USB

Heidi — Mon, 03 Aug 2020 12:47:31 GMT

Hi!

It might be helpful for you to disable the NRF_LOG_DEFERRED option in sdk_config.h. The log buffer is usually processed in the main loop so logs can easily get dropped if the application is busy with other tasks.

RE: Fastest way to dump data over USB

Heidi — Tue, 28 Jul 2020 12:50:41 GMT

Hi, I'm looking into this but due to the holidays in Norway, we are very under-staffed in the Technical Support department this week so delays are to be expected on DevZone.

Best regards,

Heidi

RE: Fastest way to dump data over USB

mkimhj — Mon, 27 Jul 2020 21:52:54 GMT

Hi, could I get an update on this from nordic?

RE: Fastest way to dump data over USB

mkimhj — Fri, 24 Jul 2020 17:08:04 GMT

Thanks for the reply.

I guess what I'm not understanding is that if the USB CDC module can support >300KB/sec, then shouldn't the NRF LOG module be able to support the throughput? Why is it overflowing and dropping messages if the underlying hardware supports 300KB/s? Is there a different API I should be calling instead of NRF_LOG_RAW_HEXDUMP_INFO?

RE: Fastest way to dump data over USB

Turbo J — Fri, 24 Jul 2020 07:44:42 GMT

The NRF_LOG module can simply throw away messages when its internal buffers are full.

I recommend writing your own data buffering on top the USB CDC module. I've seen >300KB/sec using USB CDC when transmitting data from an external QSPI flash.