Reading SDCard over usb options.

[Gibbedy]

I have a program that logs a csv file to sdcard using teensy3.2 and wiz820io/sd adapter.

At the moment I can dump data over serial but it can take a while.

Is there other ways people are doing this?
Thanks.

 

[Epyon]

Why not increase the speed of your serial connection? The emulated serial can go well up to multiple MBds, which is faster than the maximum SD read speed most Teensy applications achieve.

 

[Gibbedy]

It's a bit inconvenient on the Pc side to setup for serial read.

But I'll do that and up the speed I suppose.

 

[KurtE]

Have you tried experimenting using RAW Hid over USB, which sends 64 byte packets?

More info up at: https://www.pjrc.com/teensy/rawhid.html

 

[Frank B]

+1, RawHID is a good solution.

 

[tni]

-1, RawHID is not a good solution in terms of performance.

It is limited to one 64-byte packet per millisecond, so you get 64kBytes/s maximum. With USB serial, you can do close to 1MB/s under ideal circumstances. It will be less in practice, since the SD file access is synchronous.

 

[Frank B]

Oh yes,you're right.