Speed of using LPC to write USB disk

canheting — Thu, 08 Jul 2021 07:39:14 GMT

Hi!

In my project, I need to export data to USB disk with the FatFs file system on lpc1788 platform. The real speed I tested was 400KB/s~450KB/s.

Official documents show that the USB speed can reach 12Mb/s(1.5MB/s).

The USB device controller on the LPC178x/177x enables full-speed (12 Mb/s) data
exchange with a USB host controller.

Therefore, my question is, what is the maximum speed that lpc1788 can export data to USB disk, and how can I improve the speed?

Re: Speed of using LPC to write USB disk

xiangjun_rong — Thu, 08 Jul 2021 09:11:57 GMT

Hi, Geng,

I think the Flash erasing/programing dominate the usb disk speed rather than the USB transfer speed.

XiangJun Rong