NRF52840 USB CDC ACM Secure DFU Bootloader Example

[jwcheon]

Hi,

I am testing the USB CDC ACM Secure DFU Bootloader example via NRF52840. softdeivce uses 5.0.0-2 alpha and uses SDK version 14.1.

I have a problem.

I ran Erase all through nRFgo Studio and programmed Softdeivce. Then I build the example through Keil and [download] it.

After that, looking at the memory map from nRFgo Studio,

---

Region 1 (Bootloader) Size: 60kB Address: 0xf1000

---

Region 1 (Application)

Size: 828kB

Address: 0x22000

---

Region 1 (Softdevice) Size: 136kB Firmware: Unknown (Id: 0x0096)

---

It comes out like above.

On the board, we confirmed that LED1 and LED3 are on. After that, I confirmed that LED2 turns on when USB is connected.

But in Windows (I am using Win10 x64), I get "Device Recognition Failed" in Device Manager. Is my test method wrong?

In summary,

1. Run [Erase all] through nRFgo Studio and [Program] the Softdevice.

2. Keil built and downloaded the USB CDC ACM Secure DFU Bootloader example.

3. After confirming that LED1 and LED3 are turned on, I plugged in USB and confirmed that LED1 -> LED2 turns on.

4. I confirmed that it was attached to the PORT in the device manager, but confirmed that it was caused by the device recognition failure.

I wonder if my test method is wrong. Help!

[jwcheon]

In addition, I built and downloaded the [pca10056_debug] folder, not the [pca10056] folder in the experimental_bootloader_secure_usb example.

[Hung Bui]

The pca10056_debug shouldn't a problem. But have you tried to test if the USB CDC ACM works fine ? You can test using \examples\peripheral\usbd_cdc_acm example. The driver included should be used. Also what about other USB examples, have you tested ?

[jwcheon]

Hi Hung, thank you for the reply.

The \ examples \ peripheral \ usbd_cdc_acm example you mentioned works fine.

But I tried the USB CDC ACM Secure DFU Bootloader Example again, but the USB recognition fails. Device Manager displays "Unknown USB device (device descriptor request failed)". Am I not good at building the program?

[Hung Bui]

Hi,

I'm seeing the same issue here. I will check with R&D and get back to you when I find smth.

[Hung Bui]

Hi again Jwcheon,

Most likely your issue is the same as this issue. Could you try to test again with RTT viewer connected ?