USB-serial DFU without softdevice doesn't work using SDK 17.1.0.

[fizyk]

I have an issue with DFU via USB CDC ACM.

I would like to update the firmware using open bootloader over USB without softdevice.

I already tried to follow the thread: devzone.nordicsemi.com/.../nordic-q-a/43698/bootloader-serial-dfu-without-softdevice-sdk-15?ReplySortBy=CreatedDate&ReplySortOrder=Ascending and also I've tried to follow the nrfutil/bootloader documentation.

My design is based on $SDK_path/nRF5_SDK_17.1.0_ddde560/examples/dfu/open_bootloader and the blink app. I have tried to use the precompilend one as well as compiled from source by myself (mbr version).

My steps and output:

Clear nrf52 flash memory and UICR:

bartek@iMac open_bootloader % make erase

nrfjprog -f nrf52 --eraseall

Erasing user available code and UICR flash areas.

Applying system reset.

I thing for the open bootloader I don't need this step, but anyway I have generated the key:

bartek@iMac open_bootloader % nrfutil keys generate private.key

bartek@iMac open_bootloader % nrfutil keys display --key pk --format code private.key --out_file public_key.c

Then I have coppied generated key from the public_key.c into the dfu_public_key.c from the example/dfu and maked the project:

bartek@iMac open_bootloader % make

Linking target: _build/nrf52840_xxaa_debug.out

text data bss dec hex filename

66460 276 45940 112676 1b824 _build/nrf52840_xxaa_debug.out

Preparing: _build/nrf52840_xxaa_debug.hex

Preparing: _build/nrf52840_xxaa_debug.bin

Generate basic settings:

bartek@iMac open_bootloader % nrfutil settings generate --family NRF52840 --application my_blink_mbr.hex --application-version 1 --bootloader-version 1

--bl-settings-version 1 settings.hex

Note: Generating a DFU settings page with backup page included.

This is only required for bootloaders from nRF5 SDK 15.1 and newer.

If you want to skip backup page generation, use --no-backup option.

Generated Bootloader DFU settings .hex file and stored it in: settings.hex

Bootloader DFU Settings:

* File: settings.hex

* Family: NRF52840

* Start Address: 0x000FF000

* CRC: 0xC9728D3D

* Settings Version: 0x00000001 (1)

* App Version: 0x00000001 (1)

* Bootloader Version: 0x00000001 (1)

* Bank Layout: 0x00000000

* Current Bank: 0x00000000

* Application Size: 0x00000744 (1860 bytes)

* Application CRC: 0x86FFD574

* Bank0 Bank Code: 0x00000001

* Softdevice Size: 0x00000000 (0 bytes)

* Boot Validation CRC: 0x00000000

* SD Boot Validation Type: 0x00000000 (0)

* App Boot Validation Type: 0x00000000 (0)

generate the package:

bartek@iMac open_bootloader % nrfutil pkg generate --hw-version 52 --application-version 1 --application my_blink_mbr.hex --key-file private.key --sd-r

eq 0 my_blink_mbr.zip

Zip created at my_blink_mbr.zip

flash the mbr:

bartek@iMac open_bootloader % make flash_mbr

nrfjprog -f nrf52 --program ../support/sdk/nRF5_SDK_17.1.0_ddde560/components/softdevice/mbr/hex/mbr_nrf52_2.4.1_mbr.hex --sectorerase

Parsing image file.

Erasing page at address 0x0.

Applying system reset.

Checking that the area to write is not protected.

Programming device.

nrfjprog -f nrf52 --reset

Applying system reset.

Run.

flash the bootloader:

bartek@iMac open_bootloader % make flash

DONE nrf52840_xxaa_debug

Flashing: _build/nrf52840_xxaa_debug.hex

nrfjprog -f nrf52 --program _build/nrf52840_xxaa_debug.hex --sectorerase

Parsing image file.

Erasing page at address 0xE0000.

Erasing page at address 0xE1000.

Erasing page at address 0xE2000.

Erasing page at address 0xE3000.

Erasing page at address 0xE4000.

Erasing page at address 0xE5000.

Erasing page at address 0xE6000.

Erasing page at address 0xE7000.

Erasing page at address 0xE8000.

Erasing page at address 0xE9000.

Erasing page at address 0xEA000.

Erasing page at address 0xEB000.

Erasing page at address 0xEC000.

Erasing page at address 0xED000.

Erasing page at address 0xEE000.

Erasing page at address 0xEF000.

Erasing page at address 0xF0000.

WARNING: A UICR write operation has been requested but UICR has not been

WARNING: erased. Please verify that the result is correct.

Applying system reset.

Checking that the area to write is not protected.

Programming device.

nrfjprog -f nrf52 --reset

Applying system reset.

Run.

Load the package:

bartek@iMac open_bootloader % nrfutil dfu usb-serial -pkg my_blink_mbr.zip -p /dev/tty.usbmodemD28CF7D29DCC1 -b 115200 -fc 1

[------------------------------------] 0%

Traceback (most recent call last):

File "/usr/local/bin/nrfutil", line 8, in <module>

sys.exit(cli())

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1128, in __call__

return self.main(*args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1053, in main

rv = self.invoke(ctx)

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1659, in invoke

return _process_result(sub_ctx.command.invoke(sub_ctx))

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1659, in invoke

return _process_result(sub_ctx.command.invoke(sub_ctx))

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1395, in invoke

return ctx.invoke(self.callback, **ctx.params)

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 754, in invoke

return __callback(*args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 1023, in usb_serial

timeout)

File "/usr/local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 978, in do_serial

dfu.dfu_send_images()

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 127, in dfu_send_images

self._dfu_send_image(self.manifest.application)

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 88, in _dfu_send_image

self.dfu_transport.open()

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 217, in open

self.__get_mtu()

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 366, in __get_mtu

self.mtu = struct.unpack('<H', bytearray(response))[0]

TypeError: 'NoneType' object is not iterable

And the RTT logs:

<info> app: Open USB bootloader started

<debug> app: In nrf_bootloader_init

<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...

<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.

<debug> nrf_dfu_settings: Using settings page.

<debug> nrf_dfu_settings: Copying forbidden parts from backup page.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.

<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.

<debug> app: Enter nrf_bootloader_fw_activate

<info> app: No firmware to activate.

<info> app: Boot validation failed. No valid app to boot.

<debug> app: DFU mode because app is not valid.

<info> nrf_bootloader_wdt: WDT is not enabled

<debug> app: in weak nrf_dfu_init_user

<debug> app: timer_stop (0x20000048)

<info> app: Entering DFU mode.

<info> app_timer: RTC: initialized.

<debug> app: Initializing transports (found: 1)

<debug> nrf_dfu_serial_usb: Initializing drivers.

<debug> nrf_dfu_serial_usb: Starting USB

<debug> nrf_dfu_serial_usb: USB Transport initialized

<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.

<debug> app: Enter main loop

<info> nrf_dfu_serial_usb: USB power detected

<info> nrf_dfu_serial_usb: USB ready

<warning> nrf_dfu_serial_usb: Could not read from CDC. Error: 0x92.

My configuration:

Board: NRF52840DK PCA10056

SDK: nRF5_SDK_17.1.0_ddde560

Compiler: gcc-arm-none-eabi-9-2019-q4-major-mac

OS: macOS Big Sur 11.3

Nrf Util: nrfutil version 6.1.3

Python: 3.7.12

IDE: VS code + GCC + SDK.

Softdevice: No Softdevice.

system_profiler SPUSBDataType USB:

Open DFU Bootloader:

Product ID: 0x521f

Vendor ID: 0x1915 (Nordic Semiconductor ASA)

Version: 1.00

Serial Number: D28CF7D29DCC

Speed: Up to 12 Mb/s

Manufacturer: Nordic Semiconductor

Location ID: 0x14320000 / 37

Current Available (mA): 500

Current Required (mA): 100

Extra Operating Current (mA): 0

Thank you in advance

[Edvin]

Hello,

The first thing I see is the warning from the UICR not being erased. I suggest that you program the bootloader, the mbr and the bootloader settings *** without resetting the device. In fact, there is no need to reset the nRF before you have programmed all the components. 

*** I also see that you don't program the settings.hex file that you generated. Is that on purpose?

Lastly, did you change the USB cable to the other USB port on the DK before you tried to perform the DFU? Please note that the USB bootloader uses the USB peripheral on the DK, while if you want to use the UART bootloader, then you should not change the USB port on the DK (but you would need to use the serial bootloader, not the USB bootloader. 

Best regards,

Edvin

[fizyk]

Thank you for a quick reply,

Edvin said:

I also see that you don't program the settings.hex file that you generated. Is that on purpose?

Preparing the description of the issue I have forgotten about one step:

mergehex --merge settings.hex  _build/nrf52840_xxaa_debug.hex --output output.hex.

So the procedure I am following is:

bartek@iMac open_bootloader % nrfjprog -f nrf52 --eraseall
Erasing user available code and UICR flash areas.
Applying system reset.

bartek@iMac open_bootloader % nrfjprog -f nrf52 --program ../support/sdk/nRF5_SDK_17.1.0_ddde560/components/softdevice/mbr/hex/mbr_nrf52_2.4.1_mbr.hex --sectorerase

Parsing image file.
Erasing page at address 0x0.
Applying system reset.
Checking that the area to write is not protected.
Programming device.

This time additionallly I have called erease uicr befor writing the bootloader

bartek@iMac open_bootloader % nrfjprog -f NRF52 --eraseuicr

Erasing UICR flash area.
Applying system reset.

And the program the bootloader with settings merged into output.hex

bartek@iMac open_bootloader % nrfjprog -f nrf52 --program output.hex --sectorerase

Parsing image file.
Erasing page at address 0xE0000. <up to address 0xFF000>
WARNING: A UICR write operation has been requested but UICR has not been
WARNING: erased. Please verify that the result is correct.
Applying system reset.
Checking that the area to write is not protected.
Programming device.

The program entered bootloader after pushing the reset button.

open_bootloader % nrfutil dfu usb-serial -pkg my_blink_mbr.zip -p /dev/tty.usbmodemD28CF7D29DCC1 -b 115200 -fc 1
[------------------------------------] 0%
Traceback (most recent call last):
File "/usr/local/bin/nrfutil", line 8, in <module>
sys.exit(cli())
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1128, in __call__
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1053, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1659, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1659, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1395, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 754, in invoke
return __callback(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 1023, in usb_serial
timeout)
File "/usr/local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 978, in do_serial
dfu.dfu_send_images()
File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 127, in dfu_send_images
self._dfu_send_image(self.manifest.application)
File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 88, in _dfu_send_image
self.dfu_transport.open()
File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 217, in open
self.__get_mtu()
File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 366, in __get_mtu
self.mtu = struct.unpack('<H', bytearray(response))[0]
TypeError: 'NoneType' object is not iterable

and the RTT output:

<info> app: Open USB bootloader started
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> nrf_dfu_validation: CRC check of app failed. Return 1
<debug> app: App is valid
<warning> nrf_dfu_settings: No additional data erased
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Running nrf_bootloader_app_start with address: 0x00001000
<debug> app: Disabling interrupts. NVIC->ICER[0]: 0x0
<info> app: Open USB bootloader started
<debug> app: In nrf_bootloader_init
<debug> nrf_dfu_settings: Calling nrf_dfu_settings_init()...
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> nrf_dfu_settings: Using settings page.
<debug> nrf_dfu_settings: Copying forbidden parts from backup page.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<info> nrf_dfu_settings: Backing up settings page to address 0xFE000.
<debug> nrf_dfu_settings: Destination settings are identical to source, write not needed. Skipping.
<debug> app: Enter nrf_bootloader_fw_activate
<info> app: No firmware to activate.
<debug> nrf_dfu_validation: CRC check of app failed. Return 1
<debug> app: App is valid
<debug> app: DFU mode requested via pin-reset.
<info> nrf_bootloader_wdt: WDT is not enabled
<debug> app: in weak nrf_dfu_init_user
<debug> app: timer_stop (0x20000048)
<info> app: Entering DFU mode.
<info> app_timer: RTC: initialized.
<debug> app: Initializing transports (found: 1)
<debug> nrf_dfu_serial_usb: Initializing drivers.
<debug> nrf_dfu_serial_usb: Starting USB
<debug> nrf_dfu_serial_usb: USB Transport initialized
<debug> nrf_dfu_flash: Initializing nrf_fstorage_nvmc backend.
<debug> app: Enter main loop
<info> nrf_dfu_serial_usb: USB power detected
<info> nrf_dfu_serial_usb: USB ready
<warning> nrf_dfu_serial_usb: Could not read from CDC. Error: 0x92.

Edvin said:

Lastly, did you change the USB cable to the other USB port on the DK before you tried to perform the DFU? Please note that the USB bootloader uses the USB peripheral on the DK, while if you want to use the UART bootloader, then you should not change the USB port on the DK (but you would need to use the serial bootloader, not the USB bootloader. 

I have connected the J3 (nRF USB). This one is named in the MacOS /dev/tty.usbmodemD28CF7D29DCC1. In the target application I am using USB CDC ACM for configuring my application. Moreover I am planning to run the bootloader via the application menu.

[Edvin]

Ok, so you use the correct USB port, then. 

Did you check the Warning regarding the UICR:

WARNING: A UICR write operation has been requested but UICR has not been
WARNING: erased. Please verify that the result is correct.

There is a lot of text here, but what does it output if you only use these commands (replace app.hex with your application .hex file).

nrfjprog --eraseall
nrfjprog --program ..\..\..\..\..\components\softdevice\mbr\hex\mbr_nrf52_2.4.1_mbr.hex --verify
nrfjprog --program app.hex
nrfjprog --program _build\nrf52840_xxaa.hex --verify
nrfjprog --reset

This doesn't throw any warnings when I do it. What nrfjprog version do you have? (nrfjprog --version)

After these commands, my nRF is in bootloader mode, and I can perform the DFU using a pkg that I generated using this command (from the SDK\examples\dfu\secure_bootloader\pca10056_usb\armgcc)

nrfutil pkg generate --application files\app.hex --sd-req 0x00 --application-version 1 --hw-version 52 --key-file ..\..\..\private.key files\dfu_img.zip

(You don't need bootloader settings as long as you intend for the bootloader to go to DFU mode). 

Best regards,

Edvin

[fizyk]

bartek@iMac open_bootloader % nrfjprog --eraseall

Erasing user available code and UICR flash areas.

Applying system reset.

bartek@iMac open_bootloader % nrfjprog --program ../support/sdk/nRF5_SDK_17.1.0_ddde560/components/softdevice/mbr/hex/mbr_nrf52_2.4.1_mbr.hex --verify

Parsing image file.

Reading flash area to program to guarantee it is erased.

Checking that the area to write is not protected.

Programming device.

Verifying programming.

Verified OK.

bartek@iMac open_bootloader % nrfjprog --program my_blink_mbr.hex

Parsing image file.

Reading flash area to program to guarantee it is erased.

Checking that the area to write is not protected.

Programming device.

bartek@iMac open_bootloader % nrfjprog --program _build/nrf52840_xxaa_debug.hex --verify

Parsing image file.

Reading flash area to program to guarantee it is erased.

Checking that the area to write is not protected.

Programming device.

Verifying programming.

Verified OK.

bartek@iMac open_bootloader % nrfjprog --reset

Applying system reset.

Run.

In this moment it seems tho program freezes - LED2 is constantly enlighted.

bartek@iMac open_bootloader % nrfutil pkg generate --application my_blink_mbr.hex --sd-req 0x00 --application-version 1 --hw-version 52 --key-file private.key dfu_img.zip

Zip created at dfu_img.zip

bartek@iMac open_bootloader % nrfutil dfu usb-serial -pkg dfu_img.zip -p /dev/tty.usbmodemD28CF7D29DCC1 -b 115200 -fc 1

[------------------------------------] 0%

Traceback (most recent call last):

File "/usr/local/lib/python3.7/site-packages/serial/serialposix.py", line 322, in open

self.fd = os.open(self.portstr, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)

FileNotFoundError: [Errno 2] No such file or directory: '/dev/tty.usbmodemD28CF7D29DCC1'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 199, in open

baudrate=self.baud_rate, rtscts=self.flow_control, timeout=self.DEFAULT_SERIAL_PORT_TIMEOUT)

File "/usr/local/lib/python3.7/site-packages/serial/serialutil.py", line 244, in __init__

self.open()

File "/usr/local/lib/python3.7/site-packages/serial/serialposix.py", line 325, in open

raise SerialException(msg.errno, "could not open port {}: {}".format(self._port, msg))

serial.serialutil.SerialException: [Errno 2] could not open port /dev/tty.usbmodemD28CF7D29DCC1: [Errno 2] No such file or directory: '/dev/tty.usbmodemD28CF7D29DCC1'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "/usr/local/bin/nrfutil", line 8, in <module>

sys.exit(cli())

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1128, in __call__

return self.main(*args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1053, in main

rv = self.invoke(ctx)

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1659, in invoke

return _process_result(sub_ctx.command.invoke(sub_ctx))

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1659, in invoke

return _process_result(sub_ctx.command.invoke(sub_ctx))

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1395, in invoke

return ctx.invoke(self.callback, **ctx.params)

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 754, in invoke

return __callback(*args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 1023, in usb_serial

timeout)

File "/usr/local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 978, in do_serial

dfu.dfu_send_images()

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 127, in dfu_send_images

self._dfu_send_image(self.manifest.application)

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 88, in _dfu_send_image

self.dfu_transport.open()

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 203, in open

". Reason: {1}".format(self.com_port, e.strerror))

pc_ble_driver_py.exceptions.NordicSemiException: Serial port could not be opened on /dev/tty.usbmodemD28CF7D29DCC1. Reason: could not open port /dev/tty.usbmodemD28CF7D29DCC1: [Errno 2] No such file or directory: '/dev/tty.usbmodemD28CF7D29DCC1'

However using the ls command I cannot see the USB DFU device.

After power-cycle:

bartek@iMac open_bootloader % nrfutil dfu usb-serial -pkg dfu_img.zip -p /dev/tty.usbmodemD28CF7D29DCC1 -b 115200 -fc 1

[------------------------------------] 0%

Traceback (most recent call last):

File "/usr/local/bin/nrfutil", line 8, in <module>

sys.exit(cli())

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1128, in __call__

return self.main(*args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1053, in main

rv = self.invoke(ctx)

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1659, in invoke

return _process_result(sub_ctx.command.invoke(sub_ctx))

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1659, in invoke

return _process_result(sub_ctx.command.invoke(sub_ctx))

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1395, in invoke

return ctx.invoke(self.callback, **ctx.params)

File "/usr/local/lib/python3.7/site-packages/click/core.py", line 754, in invoke

return __callback(*args, **kwargs)

File "/usr/local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 1023, in usb_serial

timeout)

File "/usr/local/lib/python3.7/site-packages/nordicsemi/__main__.py", line 978, in do_serial

dfu.dfu_send_images()

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 127, in dfu_send_images

self._dfu_send_image(self.manifest.application)

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu.py", line 88, in _dfu_send_image

self.dfu_transport.open()

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 217, in open

self.__get_mtu()

File "/usr/local/lib/python3.7/site-packages/nordicsemi/dfu/dfu_transport_serial.py", line 366, in __get_mtu

self.mtu = struct.unpack('<H', bytearray(response))[0]

TypeError: 'NoneType' object is not iterable

Edvin said:

This doesn't throw any warnings when I do it. What nrfjprog version do you have? (nrfjprog --version)

bartek@iMac open_bootloader % nrfjprog --version

nrfjprog version: 10.12.1

JLinkARM.dll version: 6.88a

[Edvin]

Try updating your nrfjprog to the latest version (10.15.0). nRF Command Line Tools

fizyk said:

In this moment it seems tho program freezes - LED2 is constantly enlighted.

At this point, your application is not expected to run. It will be stuck in DFU mode, because the bootloader settings are not programmed, which is fine. You want it to be in DFU mode now.

If, when you update nrfjprog, you still get the same error, are you sure you are using the correct serial port? The name of the serial port may change when you plug the cable into the USB peripheral port instead of the debugger port. Please check what serial port the device is listed under after plugging in the USB peripheral port on the DK.

Best regards,

Edvin

[fizyk]

Thank you for reply;

Edvin said:

Try updating your nrfjprog to the latest version (10.15.0). nRF Command Line Tools

Updated:

bartek@iMac open_bootloader % nrfjprog --version
nrfjprog version: 10.15.0 external
JLinkARM.dll version: 6.88a

Edvin said:

If, when you update nrfjprog, you still get the same error, are you sure you are using the correct serial port?

bartek@iMac open_bootloader % system_profiler SPUSBDataType

Open DFU Bootloader:

Product ID: 0x521f
Vendor ID: 0x1915 (Nordic Semiconductor ASA)
Version: 1.00
Serial Number: D28CF7D29DCC
Speed: Up to 12 Mb/s
Manufacturer: Nordic Semiconductor
Location ID: 0x14320000 / 35
Current Available (mA): 500
Current Required (mA): 100
Extra Operating Current (mA): 0

bartek@iMac open_bootloader % ls /dev | grep D28
cu.usbmodemD28CF7D29DCC1
tty.usbmodemD28CF7D29DCC1

bartek@iMac open_bootloader % ls /dev | grep usb
cu.usbmodemD28CF7D29DCC1
tty.usbmodemD28CF7D29DCC1

These are ports related to the nrf USB (3), I am sure I am using proper port.

[Edvin]

Ok, perhaps there is something else using the USB port? Do you have it selected in nRF Connect for Desktop, some USB terminal or something other than for nrfutil? Try power cycling the board right before you call the "nrfutil dfu usb-serial ..." command to make sure. Can you try using python 3.8? I see that you are currently using 3.7.

BR,
Edvin