A question about nrf52840 USB connection to android

RE: A question about nrf52840 USB connection to android

Hadi Deknache — Fri, 27 Sep 2019 12:48:16 GMT

Hi,

I am currently also trying to receive and send data from an android device to an nrf52840 device with USB CDC. I am having trouble to get it to connect and receive that the controlTransfer fails. Is there any application that can be used to connect to the nrf52840 device on an android device?

/Hadi

RE: A question about nrf52840 USB connection to android

Vishnu Pradeep — Wed, 09 Jan 2019 05:00:29 GMT

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.

RE: A question about nrf52840 USB connection to android

sx_1508448759 — Wed, 09 Jan 2019 03:19:53 GMT

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

RE: A question about nrf52840 USB connection to android

Vishnu Pradeep — Tue, 08 Jan 2019 12:22:49 GMT

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 ?

RE: A question about nrf52840 USB connection to android

ovrebekk — Tue, 08 Jan 2019 08:04:10 GMT

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

RE: A question about nrf52840 USB connection to android

sx_1508448759 — Mon, 24 Dec 2018 06:48:47 GMT

please help me!

we use OTG line to connect nrf52840 and android pad，but we have no way to let them work