# UTAT Firmware Development Environment

My firmware development environment for the University of Toronto Aerospace Team 

https://docs.zephyrproject.org/latest/develop/getting_started/index.html

```sh
west init zephyrproject
cd zepyhrproject
west update

west zephyr-export

cd zepyhr
west sdk install

west build -p always -b nucleo_g431rb samples/basic/blinky
west flash --runner pyocd # had to su root first to run this (after running nix develop)

# MCUBoot
cd ~/utat-dev/zephyrproject
# Configure the DTS for partition sizes: https://docs.zephyrproject.org/latest/build/dts/intro-scope-purpose.html
# https://docs.zephyrproject.org/latest/build/dts/api/bindings/mtd/fixed-partitions.html
nvim "zephyr/boards/st/nucleo_g431rb/nucleo_g431rb.dts"

# Create a private key: https://docs.mcuboot.com/readme-zephyr.html
./scripts/imgtool.py keygen -k mykey.pem -t rsa-2048

# Create its public key
openssl rsa -in mykey.pem -pubout > pubkey.pem

# Set up signing: https://docs.mcuboot.com/readme-zephyr.html
# ./bootloader/mcuboot/samples/zephyr/Makefile
python scripts/imgtool.py sign \
    --key mykey.pem \
    --header-size 0x200 \
    --align 8 \
    --version 1.2 \
    --slot-size 0x8000 \
    ./


# Add the key file path to the KConfig https://docs.zephyrproject.org/latest/build/kconfig/setting.html
echo "

# Set the key file
CONFIG_BOOT_SIGNATURE_KEY_FILE=pubkey.pem" >> "./zephyr/boards/st/nucleo_g431rb/nucleo_g431rb_defconfig"



west build -p always -b nucleo_g431rb bootloader/mcuboot/boot/zephyr -d build/mcuboot -- -DEXTRA_CONF_FILE=mcuboot-nucleo-g431rb.conf
west flash -d build/mcuboot --runner pyocd # (as root, with nix develop)

cd zephyr
# Package 1
west build -p always -b nucleo_g431rb samples/basic/blinky -d build/app -- -DCONFIG_BOOTLOADER_MCUBOOT=y -DCONFIG_MCUBOOT_GENERATE_UNSIGNED_IMAGE=y
west flash -d build/app --runner pyocd  # (as root, with nix develop)

# Package 2
west build -p always -b nucleo_g431rb samples/basic/blinkyslow -d build/blinkyslow -- -DCONFIG_BOOTLOADER_MCUBOOT=y -DCONFIG_MCUBOOT_GENERATE_UNSIGNED_IMAGE=y
pyocd flash --target stm32g431rbtx --base-address 0x08014800  build/blinkyslow/zephyr/zephyr.signed.hex
```