161d3ce05c
CI was not building the a.rs application due to the requirement of b.bin having been built first. Add a feature flag to examples so that CI can build them including a dummy application. Update a.rs application examples so that they compile again.
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-binutilscargo-flashembassy-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 --features embassy-nrf/nrf52840
# 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.