RSS
Sort by » date activity ▼ answers views votes

87 questions

Tagged
  • x
51
views
1
vote
1
answer
Last activity 2017-12-14 02:27:53 +0200 by Artak

nRF52840 usb pins impedance

How much is the nRF52840 USB DP/DM pins impedance in transmit mode? There is no info in datasheet .

On the PDK board there are 39 ohm resistors connected in series with USB signals. Are they intended for impedance matching ... (more)

24
views
no
votes
no
answers
Last activity 2017-12-07 13:17:25 +0200 by Fabian Frei

Thread cli example on nRF52840dk - USB not recognized

I try to run the thread cli example on the nRF52840dk with the SDK_for_Thread_v0.11.0_84a130f.

Windows 10 throws an error like "USB device not recognized / Error trying to get device description" (translated)

  • I tried several USB-Cable, dev kits and ...
(more)

35
views
no
votes
1
answer
Last activity 2017-12-05 00:49:44 +0200 by mweger

Connections for nRF52 - SWD and VDD outputs

I am designing a custom board with nRF52840, powered by USB, no battery, using its internal LDOs to supply other peripherals with 3.3V

I have two questions about pins/outputs:

  1. Can I take the 3.3V from any of ...

(more)

49
views
no
votes
no
answers
Last activity 2017-11-27 10:59:09 +0200 by Aylik

nRF52840 SDK14.x nrf usb driver problem

Hi Engineers!

We used SDK13 for our Project (multilink BLE with 1xServer & 4x PeerS) and now move to SDK14.2, almost done except only USBD.

  1. if we use SDK13 driver , our PC aplication (HID EP1) works very stable (we use ...

(more)

48
views
no
votes
no
answers
Last activity 2017-11-24 16:35:28 +0100 by Jakub J.

pca10056 usb device

Hello

Recently I bought two PCA10056 boards in order to explore USB capabilities of new nordic chips. I've tried usb device examples supplied with SDK v14.1 and v13.1 on both of them and unfortunately only one board ... (more)

54
views
no
votes
1
answer
Last activity 2017-11-24 10:44:10 +0100 by MayaTech

USB supply without VDD supply in nRF52840

what happens when USB supply is powered but VDD isn't powered? The internal USB LDO is working ? DECUSB go to high or not ? Is there a leakage current from usb to nRF?

Thanks,

125
views
1
vote
1
answer
Last activity 2017-11-18 12:59:36 +0200 by Shiba Inu flag of United States

nRF52840 Template Project for USB and BLE

With SD140 v6.0.0.6 having been released, will an accompanying example project that demonstrates simultaneous use of BLE and USB be released? Will this be included in the next SDK or if one already exists, could someone post ... (more)

239
views
4
votes
2
answers
Last activity 2017-11-16 11:42:33 +0200 by BCI

Read data from nRF51 to MATLAB

Hi all, i'm continuing the exploration of the possibilities offered by BLE. I tried the example ble_app_uart on my nRF51 DK, sending for example the number "1" from my phone to the DK (in future i will send sensor ... (more)

83
views
no
votes
no
answers
Last activity 2017-11-11 19:13:27 +0200 by Sebastian

nRF52840 USB CDC ACM Windows 10 Unknown USB Device

Hi,

I compiled (using ARM GNU) and run the USB CDC ACM example found on SDK_14_0_0. I have windows 10.

Windows 10 do not reckognize it as a CDC device and instead I am getting an 'Unkown USB Device (Device ... (more)

69
views
no
votes
1
answer
Last activity 2017-11-09 15:15:47 +0200 by Dom O

Dead-ish nRF52-DK anything else I can try?

One of my nRF52-DK started to act oddly - very brief message in red type flashed up by nRFgoStudio on programming a few times - unfortunately too fast for me to read.

Now Windows 10 cannot connect to that nRF52-DK at all ... (more)

40
views
no
votes
1
answer
Last activity 2017-11-08 14:48:30 +0200 by Jørgen Holmefjord flag of Norway

How to establish a communication with PCA10028 (programmed without ble-nus) through an Adafruit BLEfruit LE friend USB dongle?

Hi everyone,

I would like to know if it is possible to establish a serial communication to a PCA10028 card using Adafruit Bluefruilt LE friend knowing that there is no ble-nus programmed in the DK and I may note rewrite ... (more)

49
views
no
votes
no
answers
Last activity 2017-11-03 15:05:08 +0200 by martin.richter.supervag

NRF52840 USB stucks after while

Hi,

i am checking NRF52840 for USB behaviour. I'm using example usbd_cdc_acm. But USB receiving stucks after few bytes (between 0 and 50) and does not receives nothing more.

I corrected the buffer size as recommended in https://devzone.nordicsemi.com/questi...

36
views
no
votes
no
answers
Last activity 2017-11-02 17:16:10 +0200 by Hayk

Experimental_bootloader_secure_usb example does not work on NRF 52840

Hello. I would like to run DFU experimental_bootloader_secure_usb example on NRF 52840 but the USB port does not recognize my device. I tried with both 5.0.0-2Alpha and 6.0.0-6Alpha versions of the softdevice. Tried to the softdevice ... (more)

18
views
no
votes
1
answer
Last activity 2017-10-31 15:47:42 +0100 by Håkon Alseth

device_req _cb callback of NRF24LU1+

Codes:

hal_usb_dev_req_resp_t device_req_cb(hal_usb_device_req* req, uint8_t** data_ptr, uint8_t* size) large reentrant
{
  hal_usb_dev_req_resp_t retval;

  if( hal_usb_hid_device_req_proc(req, data_ptr, size, &retval) == true ) 
  {
    // The request was processed with the result stored in the retval variable
    return retval;
  }
  else
  {
     The request was *not* processed ...
(more)

73
views
1
vote
1
answer
Last activity 2017-10-30 16:46:08 +0200 by krnd

nRF52 DK - USB CDC ACM Example not working with HTerm/Qt

Hi, I am currently trying to get the USB CDC ACM Example on the nRF52 DK to work using the SDK v14.1.0 . But for some reason I can only send/receive data using PuTTY but neither HTerm nor ... (more)

356
views
no
votes
1
answer
Last activity 2017-10-24 11:06:48 +0200 by Hung Bui

Obtain a PID for an nrf24lu1+ based product?

If I make a product using the nrf24lu1+ chip how can I register a PID for it? The VID is 0x1915 and I know that Bitcraze uses a PID of 0x7777. The Linksys WUSB11 v2.8 802.11b Adapter uses ... (more)

1k
views
5
votes
5
answers
Last activity 2017-10-10 19:11:20 +0200 by NewAce

Is it safe to use USB dp/dm pins for SWD interface?

We are building a new version of a small device with the new nRF52832. Its only external connection is a micro USB plug that we use for charging - we do not need it as USB data interface. But would like ... (more)

269
views
1
vote
3
answers
Last activity 2017-09-30 21:06:04 +0100 by Don Schoppe

Bluetooth and USB at the same time on nRF52840

Hello,

Do you have a soft device that integrates both Bluetooth and USB on the nRF52840 ?

I want to program a firmware that uses both and I'm wondering if you have ready-to-use examples on that ?

Thanks

Benoît

288
views
1
vote
2
answers
Last activity 2017-09-28 21:19:17 +0200 by newtom

nRF52840 USB hardfault

Hello,

I am evaluating the USB audio example from SDK v14 with an nRF52840-Preview-DK (PCA10056, V0.9.2, 2017.25).

SW9 is set to VDD power, SW6 is set to DEFAULT. The board is connected over both USB connectors to ... (more)

103
views
no
votes
no
answers
Last activity 2017-09-19 12:44:51 +0100 by VoidGreen

NRF52840 USB MSD without optimizations

Hello,

I am currently trying to make an MSD RAM disk with nrf52840 nRF5_SDK_14.0.0 with O0 optimization level. And had no success. For some reason in Keil example O3 is used. If I set O0 then it stops ... (more)

165
views
6
votes
1
answer
Last activity 2017-09-07 23:22:10 +0200 by Krzysztof Loska flag of Poland

NRF52840 Thread example power down 10 mins after USB disconnect

Hello,

I am trying the Thread Cloud COAP Client

<InstallFolder>\examples\thread\experimental\cloud_coap_client

on a NRF52840 PDK. I'm using Thread SDK v0.10.0. The example works as described.

However, when I unplug the board from USB, it ... (more)

97
views
no
votes
1
answer
Last activity 2017-09-01 02:55:42 +0200 by DragonAnger

nrf51822 wired UART and USB to UART

Hi, I have some question about wiredUART and USB to UART

I'm using nrf51822+BLE400.

Is there any difference UART communication between using USB to UART

and wiring on the UART pins?

I'm using ble_app_uart(SDK 12).

I ... (more)

113
views
1
vote
1
answer
Last activity 2017-08-03 13:31:38 +0100 by Hung Bui

example usbd_msc can't work on nRF52840

I test the example of usbd_msc on nRF52840 Preview DK, but only get three empty devices on PC. Where can I get more information about it?

844
views
no
votes
2
answers
Last activity 2017-07-28 09:03:12 +0200 by madblue

nRF52 DK Log debug messages (USB-UART)

Hi,

I am using the nrf52 DK (PCA10040) and have a problem with the USB-UART. For some reason I do not see any log messages in the terminal. I started with the "coap server" example project (nrf5 IoT SDK) and ... (more)

52
views
no
votes
no
answers
Last activity 2017-07-26 16:19:22 +0100 by siegfriedr

USB CDC_ACM sample OS Win10

For me the sample can be compiled but does not work with PC. SDK is 13.1. OS is W10. Serial port is installed automatically by using W10 standard driver (usbser.inf). There is a message in the properties event ... (more)

114
views
no
votes
no
answers
Last activity 2017-07-26 04:22:18 +0200 by Ladasky

Linux, UART over USB frequently fails to connect

Hello everyone,

Thanks in advance for your patience in reading this long message.

I have been having problems with UART over USB on PCA10040 boards for almost four months now. Something changed around March of this year. I have seen ... (more)

197
views
1
vote
1
answer
Last activity 2017-07-25 14:59:54 +0200 by Radosław Koppel

Which USB class should I use for maximum data rates on nrf52840? And what is the maximum size of transfer if I use CDC_ACM?

I want to transfer sensor data to a raspberry pi using the in-built USB on nrf52840. The example codes have the following classes: CDC_ACM, Audio, HID and Mass storage. I want to transfer data around 200 KB/s. Which class ... (more)

270
views
1
vote
no
answers
Last activity 2017-07-24 11:23:19 +0200 by ilia

nRF52840 USB example crash

Hi. I've just received my nRF52840-PDK and now I am trying to run usb examples from SDK 13.1.0.

I have started with VisualGDB using arm-eabi toolchain and USB HID Generic example from the SDK. The project built ... (more)

59
views
no
votes
no
answers
Last activity 2017-07-24 10:22:39 +0100 by Fan Jiaming

Need Help with USB MSC Protocol [closed]

I planed to use a Micron serial NAND chip to do a mass storage device. However, when I try to integrate the USB MSC code, the mass storage is unable to instantiate in my PC.

Using the logger module, I ... (more)

125
views
1
vote
1
answer
Last activity 2017-07-20 09:25:10 +0200 by Jørgen Holmefjord flag of Norway

looking for example Gazell project on Nrf52840

I am looking at using two Nrf52840 on Custom PCBs to create a wireless link from my product to a PC one 840 would be the host and would be wired to the PC using USB (HID,MSC,CDC) and ... (more)

Statistics

  • Total users: 25687
  • Latest user: Lucienne Etienne
  • Resolved questions: 11282
  • Unanswered questions: 3823
  • Total questions: 27855

User menu

    or sign up

Recent questions