NRF52840: Difference between revisions

From RevSpace
Jump to navigation Jump to search
← Older edit
 
(9 intermediate revisions by the same user not shown)
Line 8: Line 8:


== 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 27: Line 29:
** Most boards seem to come with a modified version of a bootloader meant for another type of board
** 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
** 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?
** 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
** Risk of accidentally overwriting the bootloader, with UF2 flash offsets sometimes being absolute, sometimes being relative
** Even multiple levels of bootloader? Like the normal one during application and another one using the double-reset method?


== Hardware ==
== Hardware ==
Line 39: Line 39:
This can be used to write the bootloader for example.
This can be used to write the bootloader for example.
The pads have a spacing of 1.5mm.
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 ===
=== promicro ===
Line 47: Line 52:
   SoftDevice: S140 version 6.1.1
   SoftDevice: S140 version 6.1.1
   Date: Jun 19 2021
   Date: Jun 19 2021
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 ===
=== supermini ===
Line 57: Line 87:
   SoftDevice: S140 version 6.1.1
   SoftDevice: S140 version 6.1.1
   Date: Jun 19 2021
   Date: Jun 19 2021
Kernel log says:
<pre>
[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
</pre>


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


Links:
Links:
Line 64: Line 119:
* Here is a wiki full of useful information on specific boards: https://github.com/joric/nrfmicro/wiki
* 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
** Specifically the supermini https://github.com/joric/nrfmicro/wiki/Alternatives#supermini-nrf52840
* See also https://github.com/pdcook/nRFMicro-Arduino-Core
* nRFMicro Arduino Core:
* https://github.com/ICantMakeThings/Nicenano-NRF52-Supermini-PlatformIO-Support
** 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:
My promicro board currently has bootloader 0.6.0:
** Focused on platformio
  UF2 Bootloader 0.6.0 lib/nrfx (v2.0.0) lib/tinyusb (0.10.1-41-gdf0cda2d) lib/uf2 (remotes/origin/configupdate-9-gadbb8c7)
** https://github.com/ICantMakeThings/Nicenano-NRF52-Supermini-PlatformIO-Support
  Model: nice!nano
** Bit awkward installation (copy/overwrite files inside existing platformio folder)
  Board-ID: nRF52840-nicenano
* https://docs.nordicsemi.com/bundle/ncs-3.1.0/page/zephyr/boards/others/promicro_nrf52840/doc/index.html pro-micro information from Nordic Semi
  SoftDevice: not found
  Date: Jun 19 2021
 
My supermini board came with bootloader 0.6.0:
  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: not found
  Date: Jun 19 2021


Getting 'circuitpython' to work:
Getting 'circuitpython' to work:
Line 87: 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 

...
Retrieved from "https://revspace.nl/wiki/index.php?title=NRF52840&oldid=34828"