NRF52840: Difference between revisions

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== Intro ==
== Intro ==
This page is about getting inexpensive NRF52840 boards to work with Arduino and platformio.
NRF52840 is potentially a very nice platform:
NRF52840 is potentially a very nice platform:
* low-power. quick wake-up
* low-power. quick wake-up
Line 15: Line 17:
* built-in support for quadrature counting
* built-in support for quadrature counting
* looks like it can run arduino too
* looks like it can run arduino too
However the eco-system of inexpensive boards is a complicated landscape:
* AliExpress sellers offer "promicro" and "supermini" board with unclear characteristics
* LEDs are often swapped (blue = hardware charge, red = software led?)
* Various firmware upload interface options (which one to use?):
** Using nrfutil, sends a .zip file containing various parts
** Serial DFU, used by nrfutil?
** Mass storage UF2, possibly activated using the double-reset
** SWD debug interface (requires soldering!)
* Confusing situation regarding bootloaders:
** Most boards seem to come with a modified version of a bootloader meant for another type of board
** Type of bootloader depends on type of firmware you want to run, "ZMK", Arduino using Arduino IDE, Arduino using platformio
** Space for "SoftDevice" needs to be reserved, what is this? -> it's a kind of binary blob implementing the bluetooth low-energy stack
** Risk of accidentally overwriting the bootloader, with UF2 flash offsets sometimes being absolute, sometimes being relative


== Hardware ==
== Hardware ==
The boards I have are the "promicro" and "supermini".
The boards I have are the "promicro" and "supermini".
These boards look basically identical hardware-wise.
There is a 4-pad connector to program it using SWD (VDD/SWD/SDC/GND).
This can be used to write the bootloader for example.
The pads have a spacing of 1.5mm.


Links:
The blue LED appears to flash independently of software, this is probably the charge circuit behaving randomly without a battery present.
* Nordic technical documentation: https://docs.nordicsemi.com/category/nrf52840-category
The red LED appears to be under software control.
* Here is a wiki full of useful information on specific boards: https://github.com/joric/nrfmicro/wiki
 
** Specifically the supermini https://github.com/joric/nrfmicro/wiki/Alternatives#supermini-nrf52840
Pinout/schematic: https://nicekeyboards.com/docs/nice-nano/pinout-schematic
* See also https://github.com/pdcook/nRFMicro-Arduino-Core
* https://github.com/ICantMakeThings/Nicenano-NRF52-Supermini-PlatformIO-Support


My promicro board currently has bootloader 0.6.0:
=== promicro ===
The INFO_UF2.TXT says (after double-tap reset):
   UF2 Bootloader 0.6.0 lib/nrfx (v2.0.0) lib/tinyusb (0.10.1-41-gdf0cda2d) lib/uf2 (remotes/origin/configupdate-9-gadbb8c7)
   UF2 Bootloader 0.6.0 lib/nrfx (v2.0.0) lib/tinyusb (0.10.1-41-gdf0cda2d) lib/uf2 (remotes/origin/configupdate-9-gadbb8c7)
   Model: nice!nano
   Model: nice!nano
   Board-ID: nRF52840-nicenano
   Board-ID: nRF52840-nicenano
   SoftDevice: not found
   SoftDevice: S140 version 6.1.1
   Date: Jun 19 2021
   Date: Jun 19 2021


My supermini board came with bootloader 0.6.0:
The CURRENT.UF2 file is 1.4 MB
 
Kernel log says:
<pre>
[509372.005339] usb 1-2.3: new full-speed USB device number 96 using xhci_hcd
[509372.132351] usb 1-2.3: New USB device found, idVendor=239a, idProduct=00b3, bcdDevice= 1.00
[509372.132361] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[509372.132364] usb 1-2.3: Product: nice!nano
[509372.132366] usb 1-2.3: Manufacturer: Nice Keyboards
[509372.132368] usb 1-2.3: SerialNumber: 98D93A272A6CCC7D
[509372.187474] cdc_acm 1-2.3:1.0: ttyACM0: USB ACM device
[509372.190177] usb-storage 1-2.3:1.2: USB Mass Storage device detected
[509372.190467] scsi host3: usb-storage 1-2.3:1.2
[509373.200470] scsi host3: scsi scan: INQUIRY result too short (5), using 36
[509373.200481] scsi 3:0:0:0: Direct-Access    Adafruit nRF UF2          1.0  PQ: 0 ANSI: 2
[509373.200825] sd 3:0:0:0: Attached scsi generic sg0 type 0
[509373.202317] sd 3:0:0:0: [sdb] 65801 512-byte logical blocks: (33.7 MB/32.1 MiB)
[509373.202556] sd 3:0:0:0: [sdb] Write Protect is off
[509373.202559] sd 3:0:0:0: [sdb] Mode Sense: 03 00 00 00
[509373.202782] sd 3:0:0:0: [sdb] No Caching mode page found
[509373.202784] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[509373.296933]  sdb:
[509373.297002] sd 3:0:0:0: [sdb] Attached SCSI removable disk
</pre>
 
=== supermini ===
The bag that it came in, says "Nice Nano V2.0" and "Pro Micro".
 
The INFO_UF2.TXT says:
   UF2 Bootloader 0.6.0 lib/nrfx (v2.0.0) lib/tinyusb (0.10.1-41-gdf0cda2d) lib/uf2 (remotes/origin/configupdate-9-gadbb8c7)
   UF2 Bootloader 0.6.0 lib/nrfx (v2.0.0) lib/tinyusb (0.10.1-41-gdf0cda2d) lib/uf2 (remotes/origin/configupdate-9-gadbb8c7)
   Model: nice!nano
   Model: nice!nano
   Board-ID: nRF52840-nicenano
   Board-ID: nRF52840-nicenano
   SoftDevice: not found
   SoftDevice: S140 version 6.1.1
   Date: Jun 19 2021
   Date: Jun 19 2021


However the eco-system of inexpensive boards is a complicated landscape:
Kernel log says:
* AliExpress sellers offer "promicro" and "supermini" board with unclear characteristics
<pre>
* LEDs are often swapped (blue = hardware charge, red = software led?)
[509738.557683] usb 1-2.3: new full-speed USB device number 97 using xhci_hcd
* Various firmware upload interface options (which one to use?):
[509738.684319] usb 1-2.3: New USB device found, idVendor=239a, idProduct=00b3, bcdDevice= 1.00
** Using nrfutil, sends a .zip file containing various parts
[509738.684329] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
** Serial DFU, used by nrfutil?
[509738.684332] usb 1-2.3: Product: nice!nano
** Mass storage UF2, possibly activated using the double-reset
[509738.684335] usb 1-2.3: Manufacturer: Nice Keyboards
** SWD debug interface (requires soldering!)
[509738.684337] usb 1-2.3: SerialNumber: C06AD6DDE508BCD6
* Confusing situation regarding bootloaders:
[509738.747638] cdc_acm 1-2.3:1.0: ttyACM0: USB ACM device
** Most boards seem to come with a modified version of a bootloader meant for another type of board
[509738.750113] usb-storage 1-2.3:1.2: USB Mass Storage device detected
** Type of bootloader depends on type of firmware you want to run, "ZMK", Arduino using Arduino IDE, Arduino using platformio
[509738.750535] scsi host3: usb-storage 1-2.3:1.2
** Space for "SoftDevice" needs to be reserved, what is this?
[509739.783832] scsi host3: scsi scan: INQUIRY result too short (5), using 36
** Risk of accidentally overwriting the bootloader, with UF2 flash offsets sometimes being absolute, sometimes being relative
[509739.783842] scsi 3:0:0:0: Direct-Access    Adafruit nRF UF2          1.0  PQ: 0 ANSI: 2
** Even multiple levels of bootloader? Like the normal one during application and another one using the double-reset method?
[509739.784177] sd 3:0:0:0: Attached scsi generic sg0 type 0
[509739.785504] sd 3:0:0:0: [sdb] 65801 512-byte logical blocks: (33.7 MB/32.1 MiB)
[509739.785712] sd 3:0:0:0: [sdb] Write Protect is off
[509739.785713] sd 3:0:0:0: [sdb] Mode Sense: 03 00 00 00
[509739.785916] sd 3:0:0:0: [sdb] No Caching mode page found
[509739.785918] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[509739.861761]  sdb:
[509739.861829] sd 3:0:0:0: [sdb] Attached SCSI removable disk
</pre>
 
== Software ==
Working example project for the nice!nano and supermini/promicro nrf52840 clones:
https://github.com/bertrik/nicenano-example
 
Links:
* Nordic technical documentation: https://docs.nordicsemi.com/category/nrf52840-category
* Here is a wiki full of useful information on specific boards: https://github.com/joric/nrfmicro/wiki
** Specifically the supermini https://github.com/joric/nrfmicro/wiki/Alternatives#supermini-nrf52840
* nRFMicro Arduino Core:
** Meant for integration with Arduino IDE, not platformio!
** See https://github.com/pdcook/nRFMicro-Arduino-Core
** Uses https://github.com/NordicSemiconductor/nrfx for NRF52840 specific drivers
* Platformio support for supermini:
** Focused on platformio
** https://github.com/ICantMakeThings/Nicenano-NRF52-Supermini-PlatformIO-Support
** Bit awkward installation (copy/overwrite files inside existing platformio folder)
* https://docs.nordicsemi.com/bundle/ncs-3.1.0/page/zephyr/boards/others/promicro_nrf52840/doc/index.html pro-micro information from Nordic Semi


Getting 'circuitpython' to work:
Getting 'circuitpython' to work:
Line 59: Line 133:
* HOWEVER, it also says "On nRF boards, CircuitPython 8.2.0 and later require UF2 bootloader version 0.6.1 or later. Older bootloaders cannot load the firmware. See Update UF2 Bootloader below.". Guess what bootloader came with my board ... 0.6.0
* HOWEVER, it also says "On nRF boards, CircuitPython 8.2.0 and later require UF2 bootloader version 0.6.1 or later. Older bootloaders cannot load the firmware. See Update UF2 Bootloader below.". Guess what bootloader came with my board ... 0.6.0
* They point you to https://github.com/adafruit/Adafruit_nRF52_Bootloader/releases/tag/0.9.2 but now what!?!!!
* They point you to https://github.com/adafruit/Adafruit_nRF52_Bootloader/releases/tag/0.9.2 but now what!?!!!
=== Arduino adafruit platform ===
To be figured out:
* Does this typically use the serial DFU, or the UF2?
platformio.ini
<pre>
...
</pre>

Latest revision as of 22:16, 1 December 2025

Project NRF52840
File:Nopicture.jpg
Investigating Arduino on inexpensive NRF52840 boards
Status In progress
Contact bertrik
Last Update 2025-12-01

Intro

This page is about getting inexpensive NRF52840 boards to work with Arduino and platformio.

NRF52840 is potentially a very nice platform:

  • low-power. quick wake-up
  • inexpensive
  • decent amount of flash (1024k), RAM (256k) and CPU cycles (64 MHz)
  • support various radio protocols like zigbee, ble, thread, matter, enhanced shockburst
  • built-in support for quadrature counting
  • looks like it can run arduino too

However the eco-system of inexpensive boards is a complicated landscape:

  • AliExpress sellers offer "promicro" and "supermini" board with unclear characteristics
  • LEDs are often swapped (blue = hardware charge, red = software led?)
  • Various firmware upload interface options (which one to use?):
    • Using nrfutil, sends a .zip file containing various parts
    • Serial DFU, used by nrfutil?
    • Mass storage UF2, possibly activated using the double-reset
    • SWD debug interface (requires soldering!)
  • Confusing situation regarding bootloaders:
    • Most boards seem to come with a modified version of a bootloader meant for another type of board
    • Type of bootloader depends on type of firmware you want to run, "ZMK", Arduino using Arduino IDE, Arduino using platformio
    • Space for "SoftDevice" needs to be reserved, what is this? -> it's a kind of binary blob implementing the bluetooth low-energy stack
    • Risk of accidentally overwriting the bootloader, with UF2 flash offsets sometimes being absolute, sometimes being relative

Hardware

The boards I have are the "promicro" and "supermini". These boards look basically identical hardware-wise.

There is a 4-pad connector to program it using SWD (VDD/SWD/SDC/GND). This can be used to write the bootloader for example. The pads have a spacing of 1.5mm.

The blue LED appears to flash independently of software, this is probably the charge circuit behaving randomly without a battery present. The red LED appears to be under software control.

Pinout/schematic: https://nicekeyboards.com/docs/nice-nano/pinout-schematic

promicro

The INFO_UF2.TXT says (after double-tap reset): 

 UF2 Bootloader 0.6.0 lib/nrfx (v2.0.0) lib/tinyusb (0.10.1-41-gdf0cda2d) lib/uf2 (remotes/origin/configupdate-9-gadbb8c7)
 Model: nice!nano
 Board-ID: nRF52840-nicenano
 SoftDevice: S140 version 6.1.1
 Date: Jun 19 2021

The CURRENT.UF2 file is 1.4 MB

Kernel log says: 

[509372.005339] usb 1-2.3: new full-speed USB device number 96 using xhci_hcd
[509372.132351] usb 1-2.3: New USB device found, idVendor=239a, idProduct=00b3, bcdDevice= 1.00
[509372.132361] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[509372.132364] usb 1-2.3: Product: nice!nano
[509372.132366] usb 1-2.3: Manufacturer: Nice Keyboards
[509372.132368] usb 1-2.3: SerialNumber: 98D93A272A6CCC7D
[509372.187474] cdc_acm 1-2.3:1.0: ttyACM0: USB ACM device
[509372.190177] usb-storage 1-2.3:1.2: USB Mass Storage device detected
[509372.190467] scsi host3: usb-storage 1-2.3:1.2
[509373.200470] scsi host3: scsi scan: INQUIRY result too short (5), using 36
[509373.200481] scsi 3:0:0:0: Direct-Access     Adafruit nRF UF2          1.0  PQ: 0 ANSI: 2
[509373.200825] sd 3:0:0:0: Attached scsi generic sg0 type 0
[509373.202317] sd 3:0:0:0: [sdb] 65801 512-byte logical blocks: (33.7 MB/32.1 MiB)
[509373.202556] sd 3:0:0:0: [sdb] Write Protect is off
[509373.202559] sd 3:0:0:0: [sdb] Mode Sense: 03 00 00 00
[509373.202782] sd 3:0:0:0: [sdb] No Caching mode page found
[509373.202784] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[509373.296933]  sdb:
[509373.297002] sd 3:0:0:0: [sdb] Attached SCSI removable disk

supermini

The bag that it came in, says "Nice Nano V2.0" and "Pro Micro".

The INFO_UF2.TXT says: 

 UF2 Bootloader 0.6.0 lib/nrfx (v2.0.0) lib/tinyusb (0.10.1-41-gdf0cda2d) lib/uf2 (remotes/origin/configupdate-9-gadbb8c7)
 Model: nice!nano
 Board-ID: nRF52840-nicenano
 SoftDevice: S140 version 6.1.1
 Date: Jun 19 2021

Kernel log says: 

[509738.557683] usb 1-2.3: new full-speed USB device number 97 using xhci_hcd
[509738.684319] usb 1-2.3: New USB device found, idVendor=239a, idProduct=00b3, bcdDevice= 1.00
[509738.684329] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[509738.684332] usb 1-2.3: Product: nice!nano
[509738.684335] usb 1-2.3: Manufacturer: Nice Keyboards
[509738.684337] usb 1-2.3: SerialNumber: C06AD6DDE508BCD6
[509738.747638] cdc_acm 1-2.3:1.0: ttyACM0: USB ACM device
[509738.750113] usb-storage 1-2.3:1.2: USB Mass Storage device detected
[509738.750535] scsi host3: usb-storage 1-2.3:1.2
[509739.783832] scsi host3: scsi scan: INQUIRY result too short (5), using 36
[509739.783842] scsi 3:0:0:0: Direct-Access     Adafruit nRF UF2          1.0  PQ: 0 ANSI: 2
[509739.784177] sd 3:0:0:0: Attached scsi generic sg0 type 0
[509739.785504] sd 3:0:0:0: [sdb] 65801 512-byte logical blocks: (33.7 MB/32.1 MiB)
[509739.785712] sd 3:0:0:0: [sdb] Write Protect is off
[509739.785713] sd 3:0:0:0: [sdb] Mode Sense: 03 00 00 00
[509739.785916] sd 3:0:0:0: [sdb] No Caching mode page found
[509739.785918] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[509739.861761]  sdb:
[509739.861829] sd 3:0:0:0: [sdb] Attached SCSI removable disk

Software

Working example project for the nice!nano and supermini/promicro nrf52840 clones: https://github.com/bertrik/nicenano-example

Links:

Getting 'circuitpython' to work:

Arduino adafruit platform

To be figured out:

  • Does this typically use the serial DFU, or the UF2?

platformio.ini 

...
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