Enhanced nRF52 Bootloader with OLED

Features

1. Brand Splash Screen – OEM for your barnd
2. Dual-Stage USB Boot – Easy to trigger bootloader
3. State-Aware Display – Show OTA connection status
4. BLE Update Status – Show process bar and percent
5. Fail-Safe Recovery – Stay in BLE when BLE OTA failed
6. High-Speed Engine – Finish DFU in 100s

Screenshots

Repository

https://github.com/whywilson/adafruit_nRF52_Bootloader_OTAFIX

Supported Devices

Key Macro Definition

• OLED SDA, SCL pin number
• OLED Driver type – SSD1306 or SH1106 supported
• OLED IIC Address
• Brand Name

How to Compile

Run the command below

make BOARD=board_name  

And the new boatloader file will be created under _build folder. The full Bootloader file type will be uf2, zip and hex.

How to Upgrade Bootloader

Drag and Drop with UF2

1. Connect your device to PC, MacOS or even Android which supports external storage management.
2. Double click reset button to enter the Bootloader mode, normally the Green LED will keep glowing slow and a disk label will be show on PC.
3. Drag the Bootloader UF2 file to the disk.
4. The Booloader will be upgraded super easy.

If the Bootloader is not updated, that means the Bootloader upgrade by UF2 feature has been disabled. You can try the next 2 ways.

BLE OTA with ZIP

Upload the Bootloader Zip file with MTools BLE or DFU App by Nordic.
Please make sure that the number of packages needs to be 5 to 8 before you’re on old Bootloader.
The process will take around 3 minutes.

Flash with JLINK

This requires an extra AMR Emualtor for JLINK flash. It can even recover the dead Bootloader or system firmware even the nRF52840 chip is soft-bricked.

nrfjprog --eraseall -f nrf52  
nrfjprog --program new_bootloader.hex --verify -f nrf52  
nrfjprog --reset -f nrf52  

How to enable UF2 upgrade Bootloader

Make sure that J-Link is properly connected to nRF52 (SWDIO/SWCLK/GND).

nrfjprog --memwr 0x10001014 --val 0x00000000 -f nrf52