Android Library for reading data from memory card through USB Communication

[Aaron_wafer]

Hi,

I am developing an android application which involves reading data from memory card through USB cable.I am using Android studio 3.2.1 with SDK version 28  I need to get library for same having fast data transfer possible.Please , All help will be appreciated.

Thank you

[awneil]

What does this have to do with Nordic??

[Aaron_wafer]

Hi, Thanks

We are using nrf52840 to transfer the text files from memory card to android app through usb . Currently we are using USB serial communication for data transfer. But i am looking for any other faster way of usb communication libraries. If any libraries are  available with nordic , please help.

Thank you

[awneil]

Aaron_wafer said:

i am looking for any other faster way of usb communication libraries

What do you mean, "faster"?

Be specific - how fast do you need?

What speed are you achieving currently?

[Aaron_wafer]

Hi , the issue is that the usb transfer speed says 12 mb/s but i am taking 1 minute for 1 mb data. i really dont know why it is like that . in android side , i am using a serial communication library for usb communication . I dont know if that is why speed gets low. In normal case , How we are able to transfer images / videos at 12 mb/sec between android phone and pc. What library / driver they are using for the same. 

Thanking you 

[Aaron_wafer]

any android library available for usb communication between nordic chip nrf52840 memory card and android phone

[awneil]

Nordic have USB MSC (Mass Storage Class) examples - have you tried those ... ?

[awneil]

Take a look at these similar threads:

https://devzone.nordicsemi.com/f/nordic-q-a/42119/usb-speed-issue-on-nrf52840

https://devzone.nordicsemi.com/f/nordic-q-a/42120/nrf52840-usb-cdc-strange-problem-on-windows-10/163838#163838

In particular, the first one illustrates some techniques for finding where the bottleneck(s) is/are ...