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embassy/examples/boot/application/nrf/README.md
Ulf Lilleengen 2332d8cd23
feat: compile bootloader examples for nRF91 
* Add nRF91 as target in CI builds
* Add example linker scripts for nrf91
* Make less nRF52 assumptions example config
* Add llvm-tools-preview required for cargo objcopy example
2023-01-04 13:38:43 +01:00

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Examples using bootloader

Example for nRF demonstrating the bootloader. The example consists of application binaries, 'a' which allows you to press a button to start the DFU process, and 'b' which is the updated application.

Prerequisites

  • cargo-binutils
  • cargo-flash
  • embassy-boot-nrf

Usage

# Use bare metal linker script
cp memory-bl.x ../../bootloader/nrf/memory.x

# Flash bootloader
cargo flash --manifest-path ../../bootloader/nrf/Cargo.toml --features embassy-nrf/nrf52840 --target thumbv7em-none-eabi --release --chip nRF52840_xxAA
# Build 'b'
cargo build --release --bin b
# Generate binary for 'b'
cargo objcopy --release --bin b --features embassy-nrf/nrf52840 --target thumbv7em-none-eabi -- -O binary b.bin

Flash a (which includes b.bin)

cargo flash --release --bin a --features embassy-nrf/nrf52840 --target thumbv7em-none-eabi --chip nRF52840_xxAA

You should then see a solid LED. Pressing button 1 will cause the DFU to be loaded by the bootloader. Upon successfully loading, you'll see the LED flash. After 5 seconds, because there is no petting of the watchdog, you'll see the LED go solid again. This indicates that the bootloader has reverted the update.