A question about nrf52840 USB connection to android

[sx_1508448759]

Hi all,

I am working on nRF52840, nRF5_SDK_15.2.0, pca10056,usbd_cdc_acm

I can now communicate nrf52840 with PC,However, I failed to connect nrf52840 to android,Android recognizes the device,But we can't communicate

Can we communicate with android normally?or need some special Settings?Any examples?

The example has not changed

Thank you!

[ovrebekk]

Hi

Sorry for the slow response, around Christmas and new year we have very limited staffing. 

Can you let me know which Android device you have tested?

Also, have you tested more than one, or just this one device?

How do you try to communicate on the Android side? Are you running some custom app to access the comport?

I will check with the USB developers if there is any trick to get the CDC example running on Android, but I think it should work out of the box. 

Best regards
Torbjørn Øvrebekk

[Vishnu Pradeep]

Hi,

We have a similar requirement and used the below link for developing android app. 

https://github.com/hariharan-m/Arduino-Android-USB

We could collect data from nrf52840 USB. But we later realized that this is USB to serial and the speed is also limited. We need to use USB-OTG API to collect data. Is there any sample USB-OTG APIs, libraries available ?

[sx_1508448759]

it means we cant use usbd_cdc_acm examle to connect android pad by OTG?
we need another firmware or connection type?

[Vishnu Pradeep]

I use usbd_ble_uart example. As I mentioned above we could send and receive data between nrf52840 and android smartphone through USB-OTG cable. But since we used USB-serial library in android app development, the data transfer speed is not fast as it should be(12 Mbps). So we are looking for USB APIs for android application.