nRF52840 USB throughput

[marcus.nn]

Hi, I am trying to reach the highest possible throughput when sending data over usb to nRF52840 from a host computer, but I am reaching 4Mbps max. Is this reasonable or is it possible somehow to get a higher data rate?

In the MCU I have made a vendor specific usb class with one bulk endpoint in and one out. I am using the app_usbd library from the SDK.

On the host (mac) I am running a c program that uses libusb for bulk transfers. I am queuing 1MB at a time and the data is sent in 64 byte packets.

[Jørgen Holmefjord]

Hi,

I see that your 4 Mbps is about the same as we have measured through testing with the MSC examples (writing zeros to a RAM disk from a Linux host) , so I believe this should be a reasonable throughput and close to the maximum.

Best regards,
Jørgen

[Jørgen Holmefjord]

This is an old ticket, but the referenced testing was done with the USB MSC Example.

A web search should help you with answers on what software can be used on the Linux host to write zero's to the RAM disk.